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This January 2009 session of our regular meeting will consist on review talks in the morning while the afternoon makes room for shorter talks, preferably by newcomers.
Due to the high number of attendants of the previous meetings, you are kindly invited to register to participate to the event. If you would like to give a talk, please mention it in the registration form, as well as title and abstract.
The timetable will be published in due time. Please check this website for more information or contact us by email at: firstname.lastname@example.org
After the deception following the LHC incident on September
19th, the CMS collaboration went through an important challenge by
collecting cosmic data for four weeks. Nearly 300 millions cosmic
events were collected using the full detector at the nominal magnetic
field of 3.8T. Lessons and results from that exercise will be
presented together with preliminary plans for 2009.
Aspects of supersymmetry breaking45m
I will review the basic elements of explicit and spontaneous
supersymmetry breaking. I will explain F-term and D-term supersymmetry
breaking with pedagological examples. I will discuss possible
applications in model building and related problems, revisiting the
gauge mediation scenario. Finally, I will introduce mechanisms of
dynamical supersymmetry breaking.
Lunch break + IAP board lunch meeting
Afternoon session: contributed talks
Relating dark matter and neutrino masses in supergravity15m
We study the supergravity phenomenology in the case of an
alternative seesaw mechanism for generating neutrino masses. Changes
in the neutrino sector lead to a modification of the supersymmetric
particle spectrum and the sneutrino arises naturally as the lightest
supersymmetric particle. The obtained sneutrino has a relic density
within the WMAP range and is compatible with present nuclear recoil
Successful Leptogenesis in SO(10) Unification with a Left-Right Symmetric Seesaw Mechanism15m
We study thermal leptogenesis in a broad class of
supersymmetric SO(10) models with a left-right symmetric seesaw
mechanism. We show that including lepton flavour effects together with
the second-lightest right-handed neutrino, leptogenesis can work for
specific spectra reconstructed from the low-energy data. Moreover, we
show that corrections to the relation Me=Md are crucial ingredients
for leptogenesis to work.
The old suggestive observation that black holes often resemble lumps
of ﬂuid has recently been taken beyond the level of an analogy to a
precise duality, that relates holographically a sector of anti-de
Sitter gravity to fluid dynamics. We will review this correspondence
and some of its applications, with an emphasis on the study of
instabilities of black strings and fluid tubes.
ttbar production process as a background to standard ModelHiggs decay to WW*15m
I will briefly describe, first, the current status of the
H->WW* analysis in CMS and discuss about its main news and
messages. Concentration will be more on our group contribution in this
analysis and the results obtained so far. In the second (and main)
part of the talk, I will focus on the ttbar background as one of the
main background processes of H->WW events. Therefore the approach for
ttbar background measurement is described by introduncing a control
region and optimizing selection cuts which enhance this background and
then using extrapolation of errors the total uncertainty of this
background in the Higgs signal region is estimated. At the end I will
discuss about possible improvements and development of the analysis
and then a final conclusion is made.
Central Exclusive Dijet Production15m
In view of the recent diffractive dijet data from CDF
RunII, we critically re-evaluate the standard approach to the
production of high-mass systems in proton/antiproton collision. A
central exclusive dijet production is characterized by a large
separation in rapidity of the final products and by few hadronic
remnants. This mode of production is interesting because, from the
measurement of the momenta of the daughter proton and antiproton, it
is possible to reconstruct the mass of the centrally produced system
without detecting it. Typical calculations of central exclusive
production are divided in five pieces, the lower order QCD calculation
and four corrections that can be large and leads to large
uncertainties on the value of the cross section. All the arguments
developed here can be used in order to improve our understanding of
Higgs boson exclusive production.
Ending session: invited talk
Implications of the PAMELA and ATIC excesses1h
Taking into account spins, we classify all two-body non-relativistic Dark Matter annihilation channels to the allowed polarization states of Standard Model particles, computing the energy spectra of the stable final-state particles relevant for indirect DM detection. We study the DM masses, annihilation channels and cross sections that can reproduce the PAMELA preliminary indications of an e+ excess consistently with the PAMELA p-bar data and the ATIC/PPB-BETS e++e- data. From the PAMELA data alone, two solutions emerge: (i) either the DM particles that annihilate into W,Z,h must be heavier than about 10 TeV or (ii) the DM must annihilate only into leptons. Thus in both cases a DM particle compatible with the PAMELA excess seems to have quite unexpected properties. The solution (ii) implies a peak in the e++e- energy spectrum, which, indeed, seems to appear in the ATIC/PPB-BETS data around 700 GeV. If upcoming data from ATIC-4 and GLAST confirm this feature, this would point to a O(1) TeV DM annihilating only into leptons. Otherwise the solution (i) would be favored. We comment on the implications of these results for DM models, direct DM detection and colliders as well as on the possibility of an astrophysical origin of the excess.