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BEGIN:VEVENT
SUMMARY:The golden couple of the SM: top and Higgs at present and future c
olliders
DTSTART;VALUE=DATE-TIME:20190417T123000Z
DTEND;VALUE=DATE-TIME:20190417T130000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3952@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Marcel Vos (IFIC (UVEG/CSIC) Valencia)\nIn this cont
ribution I will discuss a number of issues that connect Higgs and top phys
ics at present and future colliders. I will present the result of a fit to
LHC data of the operator coefficients that modify the electro-weak coupli
ngs of the top and bottom quark and projections for the evolution of this
fit at the HL-LHC and a future linear electron-positron collider. Finally\
, I will discuss how the determination of the top quark Yukawa coupling co
nnects the top and Higgs sectors.\n\nhttps://agenda.irmp.ucl.ac.be/event/3
283/contributions/3952/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3952/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Compilation of low-energy constraints on 4-fermion operators in th
e SMEFT
DTSTART;VALUE=DATE-TIME:20190417T094000Z
DTEND;VALUE=DATE-TIME:20190417T101000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3957@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Kin Mimouni (EPFL Lausanne)\nWe compile information
from low-energy observables sensitive to flavor-conserving 4-fermion opera
tors with two or four leptons. Our analysis includes data from e+ e− col
liders\, neutrino scattering on electron or nucleon targets\, atomic parit
y violation\, parity-violating electron scattering\, and the decay of pion
s\, neutrons\, nuclei and tau leptons. We recast these data as tree-level
constraints on 4-fermion operators in the Standard Model Effective Field T
heory (SMEFT) where the SM Lagrangian is extended by dimension-6 operators
. We allow all independent dimension-6 operators to be simultaneously pres
ent with an arbitrary flavor structure. The results are presented as a mul
ti-dimensional likelihood function in the space of dimension-6 Wilson coef
ficients\, which retains information about the correlations.\n\nhttps://ag
enda.irmp.ucl.ac.be/event/3283/contributions/3957/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3957/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higgs couplings without the Higgs
DTSTART;VALUE=DATE-TIME:20190418T090000Z
DTEND;VALUE=DATE-TIME:20190418T093000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3954@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Brian Henning (University of Geneva)\nAnomalous Higg
s couplings precipitate unitarity violation in a multitude of processes. T
hese include\, in particular\, high multiplicity (2 → more than 2) proce
sses involving longitudinal vectors\, where unitarity violation manifests
in cross-sections that grow too quickly with energy. Using EFT―which pro
vides a transparent and systematic parameterization of the energy growth
―we explore how to exploit this energy growth to measure/constrain anoma
lous Higgs couplings. In certain (important) channels\, these high-energy
probes turn out to be both complementary and competitive with standard on-
shell measurements. Additionally\, our exploratory analysis contains many
exciting avenues for refinements and improvements for both theorists and e
xperimentalists.\n\nhttps://agenda.irmp.ucl.ac.be/event/3283/contributions
/3954/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3954/
END:VEVENT
BEGIN:VEVENT
SUMMARY:EFT approach to the electron Electric Dipole Moment at the two-loo
p level
DTSTART;VALUE=DATE-TIME:20190417T073000Z
DTEND;VALUE=DATE-TIME:20190417T080000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3958@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Marc Riembau (University of Geneva)\nThe ACME collab
oration has recently reported a new bound on the electric dipole moment (E
DM) of the electron\, |d_e|\n\nhttps://agenda.irmp.ucl.ac.be/event/3283/co
ntributions/3958/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3958/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effective Theories for Precision Higgs and Flavor Physics
DTSTART;VALUE=DATE-TIME:20190415T120000Z
DTEND;VALUE=DATE-TIME:20190415T123000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3955@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Aneesh Manohar (UC San Diego)\nThe talk gives an ove
rview of recent theoretical developments in effective field theory methods
as applied to the electroweak sector\, particularly to the mechanism of e
lectroweak symmetry breaking\, and to flavor changing processes.\n\nhttps:
//agenda.irmp.ucl.ac.be/event/3283/contributions/3955/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3955/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Welcome
DTSTART;VALUE=DATE-TIME:20190415T115000Z
DTEND;VALUE=DATE-TIME:20190415T120000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3970@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Organizers ()\nhttps://agenda.irmp.ucl.ac.be/event/3
283/contributions/3970/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3970/
END:VEVENT
BEGIN:VEVENT
SUMMARY:EFT interpretations across LHC experiments and efforts towards glo
bal analyses
DTSTART;VALUE=DATE-TIME:20190417T120000Z
DTEND;VALUE=DATE-TIME:20190417T123000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3934@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Alexander Josef Grohsjean (CERN - EP/UCM)\nUp to now
\, more than 150 fb$^{-1}$ of integrated luminosity have been collected by
the CMS and ATLAS experiments at 13 TeV. These large data-sets allow chal
lenging searches for subtle signs of generic physics beyond the standard m
odel (BSM). A theoretical framework to describe such effects is provided b
y the standard model effective field theory (SMEFT) in which BSM physics i
s encoded via higher-dimensional operators modifying the couplings of the
standard model particles. Developing a comprehensive research program to m
easure the coefficients of these modified couplings with highest precision
is one of the main tasks of the LHC experiments in the upcoming years.\nI
n this talk\, latest experimental results on SMEFT measurements from the L
HC experiments will be summarized\, and a potential roadmap towards a firs
t global analysis will be outlined using the example of the CMS experiment
.\n\nhttps://agenda.irmp.ucl.ac.be/event/3283/contributions/3934/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3934/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SMEFiT: A Monte Carlo global analysis of the Standard Model Effect
ive Field Theory
DTSTART;VALUE=DATE-TIME:20190415T141500Z
DTEND;VALUE=DATE-TIME:20190415T144500Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3933@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Juan Rojo (VU Amsterdam and Nikhef)\nWe present a no
vel framework for carrying out global analyses of the Standard Model Effec
tive Field Theory (SMEFT) at dimension-six: SMEFiT. This approach is based
on the Monte Carlo replica method for deriving a faithful estimate of the
experimental and theoretical uncertainties and enables one to construct t
he probability distribution in the space of the SMEFT degrees of freedom.
As a proof of concept of the SMEFiT methodology\, we present a first study
of the constraints on the SMEFT provided by top quark production measurem
ents from the LHC. Our analysis includes more than 30 independent measurem
ents from 10 different processes at 8 and 13 TeV such as inclusive top-qua
rk pair and single-top production and the associated production of top qua
rks with weak vector bosons and the Higgs boson. State-of-the-art theoreti
cal calculations are adopted both for the Standard Model and for the SMEFT
contributions\, where in the latter case NLO QCD corrections are included
for the majority of processes. We derive bounds for the 34 degrees of fre
edom relevant for the interpretation of the LHC top quark data and compare
these bounds with previously reported constraints. Our study illustrates
the significant potential of LHC precision measurements to constrain physi
cs beyond the Standard Model in a model-independent way\, and paves the wa
y towards a global analysis of the SMEFT.\n\nhttps://agenda.irmp.ucl.ac.be
/event/3283/contributions/3933/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3933/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Positivity bounds in effective field theories
DTSTART;VALUE=DATE-TIME:20190416T090000Z
DTEND;VALUE=DATE-TIME:20190416T093000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3961@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Shuang-Yong Zhou (University of Science and Technolo
gy of China)\nRequiring an analytic and unitary UV completion for a low en
ergy effective field theory (EFT) can impose positivity bounds on the Wils
on coefficients of the EFT. These positivity bounds take the form of cons
traints on combinations of the pole subtracted scattering amplitude and it
s derivatives\, and are valid away from the forward limit and for any spin
s. Furthermore\, positivity bounds with nonlinear dependence on the amplit
ude can also be obtained. I will also discuss applications of the positivi
ty bounds to galileon theory and standard model effective field theory.\n\
nhttps://agenda.irmp.ucl.ac.be/event/3283/contributions/3961/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3961/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Symmetry currents and (some) consistency conditions in the SMEFT/L
EFT
DTSTART;VALUE=DATE-TIME:20190418T100000Z
DTEND;VALUE=DATE-TIME:20190418T103000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3960@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Mike Trott (NBI Copenhagen)\nhttps://agenda.irmp.ucl
.ac.be/event/3283/contributions/3960/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3960/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Standard Model Effective Field Theory from On-shell Amplitudes
DTSTART;VALUE=DATE-TIME:20190416T070000Z
DTEND;VALUE=DATE-TIME:20190416T073000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3959@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Jing Shu (ITP Beijing)\nWe present a general method
of constructing unfactorizable on-shell amplitudes (amplitude basis)\, and
build up their one-to-one correspondence to the independent and complete
operator basis in effective field theory (EFT). We apply our method to the
Standard Model EFT\, and identify the amplitude basis in dimension 5 and
6\, which correspond to the Weinberg operator and operators in Warsaw basi
s except for some linear combinations.\n\nhttps://agenda.irmp.ucl.ac.be/ev
ent/3283/contributions/3959/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3959/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Top quark electroweak interactions at high energy
DTSTART;VALUE=DATE-TIME:20190418T081000Z
DTEND;VALUE=DATE-TIME:20190418T083000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3956@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Luca Mantani (UCLouvain)\nhttps://agenda.irmp.ucl.ac
.be/event/3283/contributions/3956/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3956/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The CKM parameters in the SMEFT
DTSTART;VALUE=DATE-TIME:20190415T123000Z
DTEND;VALUE=DATE-TIME:20190415T130000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3951@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Javier Virto (TUM)\nExtraction of the Cabibbo-Kobaya
shi-Maskawa (CKM) matrix from flavour observables can be affected by physi
cs beyond the Standard Model (SM). We provide a general roadmap to take th
is into account\, which we apply to the case of the Standard Model Effecti
ve Field Theory (SMEFT). We choose a set of four input observables that de
termine the four Wolfenstein parameters\, and discuss how the effects of d
imension-six operators can be included in their definition. We provide num
erical values and confidence intervals for the CKM parameters\, and compar
e them with the results of CKM fits obtained in the SM context. Our approa
ch allows one to perform general SMEFT analyses in a consistent fashion\,
independently of any assumptions about the way new physics affects flavour
observables. We discuss a few examples illustrating how our approach can
be implemented in practice.\n\nhttps://agenda.irmp.ucl.ac.be/event/3283/co
ntributions/3951/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3951/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Energy and Accuracy Frontier
DTSTART;VALUE=DATE-TIME:20190418T070000Z
DTEND;VALUE=DATE-TIME:20190418T073000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3950@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Andrea Wulzer (CERN)\nAccurate measurements of high-
energy reactions are potentially powerful indirect probes of heavy new phy
sics parametrised by the SMEFT. I will summarise the status of the design
of searches implementing this idea in di-lepton and in di-boson final stat
es at the LHC and HL-LHC and I will illustrate their potential mass reach
on concrete new physics scenarios. A substantial progress is possible at t
he LHC and HL-LHC compared with present-day EW precision tests\, while sim
ilar probes performed at high energy future hadron\, lepton (including muo
n) colliders would extend the reach to tents or hundreds of TeV's. I will
also outline\, time permitting\, the potential advantages of multivariate
analyses in the di-boson channel\, possibly exploiting Machine Learning te
chniques.\n\nhttps://agenda.irmp.ucl.ac.be/event/3283/contributions/3950/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3950/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SMEFT\, the ``frog" point of view
DTSTART;VALUE=DATE-TIME:20190416T142000Z
DTEND;VALUE=DATE-TIME:20190416T145000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3944@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Giampiero Passarino (INFN Turin & Turin U.)\nThere i
s increasing need to assess the impact and the interpretation of dim = 6 a
nd dim = 8 operators within\nthe context of the Standard Model Effective F
ield Theory (SMEFT). The observational and mathematical consistency of a\n
construct based on dim = 6 and dim = 8 operators is critically examined in
the light of known theoretical\nresults. The discussion includes eliminat
ion of redundant operators and their higher order compensation\,\nSMEFT in
comparison with ultraviolet completions incorporating a proliferation of
scalar and mixings\,\ncanonical normalization of effective field theories\
, gauge invariance and gauge fixing\,\nrole of tadpoles when constructing
SMEFT at NLO\, heavy-light contributions to the low energy limit of theori
es\ncontaining bosons and fermions and one-loop matching.\n\nhttps://agend
a.irmp.ucl.ac.be/event/3283/contributions/3944/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3944/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New Physics in Double Higgs Production at Future $e^+ e^-$ Collide
rs
DTSTART;VALUE=DATE-TIME:20190417T150000Z
DTEND;VALUE=DATE-TIME:20190417T152000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3943@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Andres Felipe Vasquez Tocora (UCLouvain)\nWe study t
he effects of new physics in double Higgs production at future $e^+ e^-$ c
olliders. In the Standard Model the chiral limit ($m_e=0$) plays an import
ant role for this process\, being responsible for the smallness of the tre
e-level diagrams with respect to the 1-loop contributions. In our work\, w
e consider the possibility of an enhancement due to the contribution of St
andard Model dimension-six effective operators. We show that there are onl
y two relevant operators for this process that are not yet (strongly) cons
trained by other data. We perform a sensitivity study on the operator coef
ficients for several benchmark values of energy and integrated luminosity
related to the proposed linear colliders such as CLIC\, ILC and FCC-ee and
we derive expected 95\\% CL limits for each benchmark scenario.\n\nhttps:
//agenda.irmp.ucl.ac.be/event/3283/contributions/3943/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3943/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Global Likelihood for Precision Constraints and Flavour Anomalie
s
DTSTART;VALUE=DATE-TIME:20190415T130000Z
DTEND;VALUE=DATE-TIME:20190415T133000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3894@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Peter Stangl (LAPTh Annecy)\nI present a global like
lihood function in the space of dimension-six Wilson coefficients in the
Standard Model Effective Field Theory (SMEFT). The likelihood inc
ludes contributions from flavour-changing neutral current Bdecays\, lepton
flavour universality tests in charged- and neutral-current B and K decays
\, meson-antimeson mixing observables in the K\, B\, and D systems\, direc
t CP violation in K→ππ\, charged lepton flavour violating B\, tau\, an
d muon decays\, electroweak precision tests on the Z and W poles\, the
anomalous magnetic moments of the electron\, muon\, and tau\, and se
veral other precision observables\, 265 in total. The Wilson coefficients
can be specified at any scale\, with the one-loop running above and below
the electroweak scale automatically taken care of. The implementation of
the likelihood function is based on the open source tools flavio and wils
on as well as the open Wilson coefficient exchange format (WCxf) and can b
e installed as a Python package. It can serve as a basis either for model
independent fits or for testing dynamical models\, in particular models bu
ilt to address the anomalies in B-physics. I discuss a number of example
applications\, reproducing results from the EFT and model building litera
ture.\n\nhttps://agenda.irmp.ucl.ac.be/event/3283/contributions/3894/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3894/
END:VEVENT
BEGIN:VEVENT
SUMMARY:EFT harmonics
DTSTART;VALUE=DATE-TIME:20190416T073000Z
DTEND;VALUE=DATE-TIME:20190416T080000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3940@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Tom Melia (Kavli IPMU)\nI will discuss developments
in our understanding and construction of operator bases\n\nhttps://agenda.
irmp.ucl.ac.be/event/3283/contributions/3940/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3940/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Precision diboson measurements at hadron colliders
DTSTART;VALUE=DATE-TIME:20190417T080000Z
DTEND;VALUE=DATE-TIME:20190417T083000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3939@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Daniele Barducci (University of Rome La Sapienza)\nI
will discuss the measurements of the anomalous triple gauge couplings at
Large Hadron\nCollider focusing on the contribution of the CP-even and CP-
odd O3W operators. These deviations\nwere known to be particularly hard to
measure due to their suppressed interference with\nthe SM amplitudes in t
he inclusive processes\, leading to approximate flat directions in the\nsp
ace of these Wilson coefficients. I will present the prospects for the mea
surements of these\ninteractions at HL-LHC and HE-LHC using exclusive vari
ables sensitive to the interference\nterms and taking carefully into accou
nt effects appearing due to NLO QCD corrections.\n\nhttps://agenda.irmp.uc
l.ac.be/event/3283/contributions/3939/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3939/
END:VEVENT
BEGIN:VEVENT
SUMMARY:EFT fits to Higgs & EW data
DTSTART;VALUE=DATE-TIME:20190416T123000Z
DTEND;VALUE=DATE-TIME:20190416T130000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3938@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Chris Hays (University of Oxford)\nMy talk will cove
r EFT fits to Higgs & EW data. I will show fits at LO in the EFT expansio
n\, separately for CP-even and CP-odd operators. I will then discuss issu
es with extending to the next order in EFT\, focussing in particular on th
e effect of dimension-8 operators.\n\nhttps://agenda.irmp.ucl.ac.be/event/
3283/contributions/3938/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3938/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higgs Couplings in Longitudially-Polarised Multibosons
DTSTART;VALUE=DATE-TIME:20190416T133000Z
DTEND;VALUE=DATE-TIME:20190416T135000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3895@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Davide Maria Lombardo (University of Geneva)\nWe wan
t to establish the reach to possible deviations of the Higgs couplings fro
m their SM values\, to do this we look at processes with longitudinally po
larised vector bosons in the final states at high energies.\nEspecially\,
our analysis is grounded on the observation that deviations from the Stand
ard Model are characterised by an energy growing behaviour in the amplitud
es\, so that at higher energies New Physics signatures appear stronger and
compete with the loss of statistics. In the context of the High Luminosit
y LHC we have considered the process pp > LLLL jj\, where L is a longitudi
nally polarised vector boson\, to constraint possible deviations of the Hi
ggs self interaction.\nFrom the same perspective\, we have also studied th
e process e+e- > LL at CLIC\, where along with higher CM-energy values als
o beam polarisation is used to better constraint New Physics effects in th
e Higgs coupling.\n\nhttps://agenda.irmp.ucl.ac.be/event/3283/contribution
s/3895/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3895/
END:VEVENT
BEGIN:VEVENT
SUMMARY:One-Loop Effective Actions
DTSTART;VALUE=DATE-TIME:20190416T100000Z
DTEND;VALUE=DATE-TIME:20190416T103000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3937@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Jérémie Quevillon (LPSC (CNRS))\nIn this talk\, we
present the universal one-loop effective action obtained by integrating o
ut massive\, non-degenerate multiplets\, focusing on the coefficients of o
perators of dimension up to six composed of Standard Model fields. Our gen
eral results may be applied to loops of non-degenerate heavy fermions or b
osons. \nWe discuss the relationship of our results (and their ongoing imp
rovement) to several EFTs: the SM Effective Field Theory\, EFTs for the ga
uge bosons of some generic gauge symmetry and EFTs based on a Two Higgs Do
ublet Model.\n\nhttps://agenda.irmp.ucl.ac.be/event/3283/contributions/393
7/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3937/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Learning to pinpoint effective operators at the LHC: a study of th
e ttbb signature
DTSTART;VALUE=DATE-TIME:20190415T144500Z
DTEND;VALUE=DATE-TIME:20190415T150500Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3936@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Seth Moortgat (Vrije Universiteit Brussel (IIHE))\nI
n the context of the Standard Model effective field theory (SMEFT)\, we st
udy the LHC sensitivity to four fermion operators involving heavy quarks b
y employing cross section measurements in the $t\\overline{t}b\\overline{b
}$ final state. Starting from the measurement of total rates\, we progress
ively exploit kinematical information and machine learning techniques to o
ptimize the projected sensitivity at the end of Run III. Indeed\, in final
states with high multiplicity containing inter-correlated kinematical inf
ormation\, multi-variate methods provide a robust way of isolating the reg
ions of phase space where the SMEFT contribution is enhanced. We also show
that training for multiple output classes allows for the discrimination b
etween operators mediating the production of top quarks in different helic
ity states. Our projected sensitivities not only constrain a host of new d
irections in the SMEFT parameter space but also improve on existing limits
demonstrating that\, on one hand\, $t\\overline{t}b\\overline{b}$ product
ion is an indispensable component in a future global fit for top quark int
eractions in the SMEFT\, and on the other\, multi-class machine learning a
lgorithms can be a valuable tool for interpreting LHC data in this framewo
rk. \n\nDOI: [10.1007/JHEP11(2018)131][1]\nArXiv preprint: [1807.02130][2]
\n\n\n [1]: https://link.springer.com/article/10.1007%2FJHEP11%282018%291
31\n [2]: https://arxiv.org/abs/1807.02130\n\nhttps://agenda.irmp.ucl.ac.
be/event/3283/contributions/3936/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3936/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Higgs width in the SMEFT
DTSTART;VALUE=DATE-TIME:20190416T130000Z
DTEND;VALUE=DATE-TIME:20190416T133000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3935@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Tyler Corbett (NBI)\nWe calculate the total and part
ial inclusive Higgs widths at leading order in the Standard Model Effectiv
e Field Theory (SMEFT). We report results incorporating all SMEFT correcti
ons for two and four body Higgs decays in this limit. The narrow width app
roximation is avoided and all phase space integrals are directly evaluated
.\n\nhttps://agenda.irmp.ucl.ac.be/event/3283/contributions/3935/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3935/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Probing new physics in top decays
DTSTART;VALUE=DATE-TIME:20190418T073000Z
DTEND;VALUE=DATE-TIME:20190418T080000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3932@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Mikael Chala (IPPP Durham)\nNew physics can manifest
itself by an appreciable increase of the decay rate\nof top quarks in rar
e flavour-changing final states. Exploiting the large top\nquark productio
n rate at the LHC\, we bound four-fermion operators using\ndifferent signa
l regions of the latest LHC searches for $t \\to Zj$. We also\nprovide pro
spects for the high-luminosity LHC to test these as well as four-fermion\n
operators contributing to $t \\to bbj$\, based on improved analysis strate
gies of\nexisting searches. Finally\, we discuss rare top decays within ex
tended\neffective-field theories.\n\nhttps://agenda.irmp.ucl.ac.be/event/3
283/contributions/3932/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3932/
END:VEVENT
BEGIN:VEVENT
SUMMARY:BasisGen: automatic generation of operator bases
DTSTART;VALUE=DATE-TIME:20190416T093000Z
DTEND;VALUE=DATE-TIME:20190416T100000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3931@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Juan Carlos Criado (University of Granada)\nWhen dea
ling with effective Lagrangians it is often convenient to work with a basi
s\, i.e.\, a complete set of independent operators. I will present BasisGe
n\, a Python package for the automatic generation of operator bases in a g
eneral setting: it accepts any semisimple symmetry group and fields in any
of its finite dimensional irreducible representations. It takes into acco
unt integration by parts redundancy and\, optionally\, the use of equation
s of motion. BasisGen is also fast: this is achieved with an implementatio
n based on the classical representation-theoretic methods involving roots
and weights.\n\nhttps://agenda.irmp.ucl.ac.be/event/3283/contributions/393
1/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3931/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constraining effective field theories with machine learning
DTSTART;VALUE=DATE-TIME:20190418T093000Z
DTEND;VALUE=DATE-TIME:20190418T100000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3930@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Johann Brehmer (New York University)\nAn important p
art of the LHC legacy will be precise limits on indirect effects of new ph
ysics\, framed for instance in terms of an effective field theory. These m
easurements often involve many theory parameters and observables\, which m
akes them challenging for traditional analysis methods. We discuss the und
erlying problem of “likelihood-free” inference and present powerful ne
w analysis techniques that combine physics insights\, statistical methods\
, and the power of machine learning. We have developed MadMiner\, a new Py
thon package that makes it straightforward to apply these techniques. In e
xample LHC problems we show that the new approach lets us put stronger con
straints on theory parameters than established methods\, demonstrating its
potential to improve the new physics reach of the LHC legacy measurements
. While we present techniques optimized for particle physics\, the likelih
ood-free inference formulation is much more general\, and these ideas are
part of a broader movement that is changing scientific inference in fields
as diverse as cosmology\, genetics\, and epidemiology.\n\nhttps://agenda.
irmp.ucl.ac.be/event/3283/contributions/3930/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3930/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gauge fixing and loop calculations in EFT
DTSTART;VALUE=DATE-TIME:20190417T130000Z
DTEND;VALUE=DATE-TIME:20190417T133000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3929@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Janusz Rosiek (University of Warsaw (PL))\nI will di
scuss the technically convenient setup for loop calculations in the EFT.
First\, I will present the proof that the R_xi gauge fixing can always be
used in any EFT with linearly realised gauge symmetry and to any order in
1/Lambda expansion. Then\, I will discuss the applications to SM-EFT on th
e example of systematic calculation of h->2 gamma and h->Zgamma decays: de
rivation of Feynman rules\, gauge fixing\, choice of renormalization schem
e and final semi-numerical results.\n\nhttps://agenda.irmp.ucl.ac.be/event
/3283/contributions/3929/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3929/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resonances and the non-linear effective theory
DTSTART;VALUE=DATE-TIME:20190416T145000Z
DTEND;VALUE=DATE-TIME:20190416T152000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3928@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Juan José Sanz-Cillero (Universidad Complutense de
Madrid - IPARCOS)\nDirect searches for New Physics states have given so fa
r negative results. There is a mass gap between SM fields and possible new
states. The observed SM symmetry pattern and this mass gap justifies the
use of electroweak effective Lagrangians. Implications of new\, higher sca
les can be analyzed through next-to-leading order corrections to the Higgs
Effective Theory\, HEFT (also denoted as EW Effective Theory or EW Chiral
Lagrangian). There are three main ingredients in our present analysis: 1s
t\, an approximate chiral symmetry which spontaneously breaks down into cu
stodial symmetry\, as it occurs in the SM\; 2nd\,a non-linear realization
of the EW symmetry breaking with a singlet Higgs and an assumed strongly-c
oupled UV-completion\; 3rd\, a high-energy Lagrangian which incorporates a
set of new heavy states in addition to the SM degrees of freedom. We cons
ider spin 0\, 1/2 and 1 resonances\, allowing for new possible coloured st
ates. By integrating out these heavy resonances\, we study the pattern of
low-energy constants among the light fields. We then perform a phenomenolo
gical analysis of the low-energy constants and find that resonances with m
asses in the few TeV range are perfectly compatible with current experimen
tal constraints on the low-energy parameters. The analysis of LHC diboson
production through vector boson scattering (VBS) and Drell-Yan (DY) mechan
isms shows that resonances in the 1.5 - 3 TeV range can easily and natural
ly evade all present experimental bounds: within this framework\, future r
uns and higher luminosities will be required to be able to separate these
resonances from the SM background. In the last part\, we will quickly dis
cuss possible scenarios with new physics heavy states around the TeV scale
which do not couple directly to the SM fermions\, only indirectly via the
SM bosonic sector. This leads to an important suppression of the fermioni
c operators in the low-energy HEFT (bilinear and four-fermion operators) i
n comparison with the purely bosonic ones. This naturally suppresses VBS a
nd DY\, while leaving an imprint in SM boson measurements accessible to fu
ture experimental runs (e.g.\, the oblique S parameter).\n\nhttps://agenda
.irmp.ucl.ac.be/event/3283/contributions/3928/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3928/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effective field theory: on-shell & effectively
DTSTART;VALUE=DATE-TIME:20190416T080000Z
DTEND;VALUE=DATE-TIME:20190416T083000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3927@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Yael Shadmi (Technion)\nThe study of scattering ampl
itudes has advanced tremendously in recent years. Lorentz symmetry and uni
tarity have been shown to greatly constrain the structure of both massless
- and massive-particle amplitudes. In this talk\, I discuss the applicatio
n of these methods to the formulation and calculation of Effective Field T
heory amplitudes.\n\nhttps://agenda.irmp.ucl.ac.be/event/3283/contribution
s/3927/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3927/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Global fits for LHC Run II and the HE-LHC
DTSTART;VALUE=DATE-TIME:20190417T101000Z
DTEND;VALUE=DATE-TIME:20190417T104000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3926@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Anke Biekoetter (Uni Heidelberg)\nWe present a globa
l analysis of the Higgs and electroweak sector based on LHC Run II and ele
ctroweak precision observables using the SFitter framework. We show which
measurements provide the leading constraints on Higgs-related operators\,
and how the achieved LHC precision makes it necessary to combine rate meas
urements with electroweak precision observables. \nMoreover\, we estimate
the reach of a global analysis of the Higgs and electroweak sector for a 2
7 TeV hadron collider\, including invisible Higgs decays and the Higgs sel
f-coupling. \n\nbased on 1811.08401 and 1812.0758\n\nhttps://agenda.irmp.u
cl.ac.be/event/3283/contributions/3926/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3926/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Probing Higgs couplings at future lepton colliders in the EFT fram
ework
DTSTART;VALUE=DATE-TIME:20190417T143000Z
DTEND;VALUE=DATE-TIME:20190417T150000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3893@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Jiayin Gu (JGU Mainz)\nWe study the reach on the Hig
gs coupling constraints at future lepton colliders in a global effective-f
ield-theory framework. The impact and complementarity of different measur
ements\, at different center-of-mass energies and for several beam polariz
ation configurations are discussed in detail. The impact of Z-pole measur
ements and the complementarity with HL-LHC are also discussed.\n\nbased on
arXiv:1704.02333\, arXiv:1711.03978 and current work\n\nhttps://agenda.ir
mp.ucl.ac.be/event/3283/contributions/3893/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3893/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Can New Physics hide in the proton PDFs?
DTSTART;VALUE=DATE-TIME:20190417T091000Z
DTEND;VALUE=DATE-TIME:20190417T094000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3901@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Maria Ubiali (DAMTP\, U. of Cambridge)\nA major rece
nt breakthrough in global fits of the quark and gluon structure of the pro
ton has been the inclusion of a significant amount of precision LHC measur
ements. While these data provide important constraints\, specially on the
poorly-know gluon and antiquark PDFs\, it is crucial to avoid any contamin
ation from potential beyond the Standard Model (BSM) effects that could be
present in the high E or pT tails of the fitted distributions. This probl
em is particularly acute for LHC data from Runs II and III\, as well as fo
r the future high-luminosity run\, where many PDF-sensitive observables wi
ll reach into the few TeV region. In this talk\, I present a first quantit
ative study aiming to study whether or not BSM effects can be reabsorbed i
nto the fitted PDFs\, as well as the possibility of using the global QCD f
it to simultaneously constrain both the proton structure and BSM dynamics.
\n\nhttps://agenda.irmp.ucl.ac.be/event/3283/contributions/3901/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3901/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Interference resurrection in $Zh$ production
DTSTART;VALUE=DATE-TIME:20190416T120000Z
DTEND;VALUE=DATE-TIME:20190416T123000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3900@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Rick S Gupta (IPPP\, Durham University)\nOperators w
ith the vertex $h Z_{\\mu \\nu} h Z^{\\mu \\nu}$ contributing to associat
ed production of a Higgs boson with a transverse Z boson\, do not interfer
e with the dominant longitudinal part of the $Zh$ amplitude at high energ
ies. Here we explore how angular distributions related to the Z decay prod
ucts can be used to recover the interference term and thus gain sensitivit
y to these operators.\n\nhttps://agenda.irmp.ucl.ac.be/event/3283/contribu
tions/3900/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3900/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constraining the Higgs trilinear self-coupling at the HL-LHC and a
t the FCC-hh
DTSTART;VALUE=DATE-TIME:20190417T070000Z
DTEND;VALUE=DATE-TIME:20190417T073000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3899@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Shankha Banerjee (IPPP\, Durham University)\nIn this
talk\, we will discuss the present status of the di-Higgs searches at the
LHC. We will quantify the prospects of witnessing signatures of these elu
sive modes in the $b \\bar{b} \\gamma \\gamma$\, $b \\bar{b} \\tau^+ \\tau
^-$\, $b \\bar{b} W W^*$\, $W W^* \\gamma \\gamma$ and the $4W$ channels a
t the high luminosity run of the LHC (HL-LHC). We will emphasise the prosp
ects of measuring the Higgs self-coupling at the futuristic 100 TeV FCC-hh
collider when the two Higgs bosons are either produced in association wit
h an additional hard jet or in association with a pair of top quarks. Fina
lly\, these constraints will be translated to the operator coefficients mo
difying the Higgs self-coupling.\n\nhttps://agenda.irmp.ucl.ac.be/event/32
83/contributions/3899/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3899/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Master formula for one-loop renormalization of bosonic SMEFT opera
tors
DTSTART;VALUE=DATE-TIME:20190417T140000Z
DTEND;VALUE=DATE-TIME:20190417T143000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3898@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Claudius Krause (Fermilab)\nUsing background-field m
ethod and super-heat-kernel expansion\, we derive a master formula for the
one-loop UV divergences of the bosonic dimension-six operators in Standar
d Model Effective Field Theory (SMEFT). This approach reduces the calculat
ion of all the UV divergences to algebraic manipulations. Using this formu
la we corroborate results in the literature for the one-loop anomalous dim
ension matrix of SMEFT obtained via diagrammatic methods\, considering con
tributions from the operators $X^3$\, $\\phi^6$\, $\\phi^4 D^2$\, $X^2\\ph
i^2$ of the Warsaw basis. The formula is derived in a general way and can
be applied to other quantum field theories.\n\nhttps://agenda.irmp.ucl.ac.
be/event/3283/contributions/3898/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3898/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Unitary EChL predictions with MadGraph 5 for dynamical vector reso
nances emerging at VBS-LHC
DTSTART;VALUE=DATE-TIME:20190416T152000Z
DTEND;VALUE=DATE-TIME:20190416T155000Z
DTSTAMP;VALUE=DATE-TIME:20200528T202604Z
UID:indico-contribution-3283-3897@agenda.irmp.ucl.ac.be
DESCRIPTION:Speakers: Rafael Delgado López (Technische Universität Münc
hen)\nThe collider phenomenology of a strongly interacting electroweak sym
metry breaking sector is studied. We use the Electroweak Chiral Lagrangian
(EChL) and the Inverse Amplitude Method (IAM). And generate a MadGraph v5
UFO model\, which includes the beyond Standard Model (BSM) interactions v
ia effective vertices in the framework of a Proca Lagrangian. The constant
s of the Proca Lagrangian are adjusted to resemble those of the unitarized
matrix elements. This project is a continuation of a previous analysis of
the elastic scattering $w^+z\\to w^+z$\, extended to include processes in
volving $w^+w^-\\to w^+w^-$. Several channels (fully leptonic and semilept
onic) are being considered. Our final goal would be providing a complete a
nd tested MadGraph v5 UFO model for the phenomenology of Vector Boson Scat
tering of the EChL unitarized via IAM\, for the phenomenology and experime
ntal community.\n\nhttps://agenda.irmp.ucl.ac.be/event/3283/contributions/
3897/
LOCATION:
URL:https://agenda.irmp.ucl.ac.be/event/3283/contributions/3897/
END:VEVENT
END:VCALENDAR