18th MCnet Meeting and MCnetITN3 Mid-Term Review

Session

Network meeting

23 Jan 2019, 09:30

Salle Carnoy B059 (Institut des Sciences de la Vie (ISV))

Conveners

Network meeting: Student and Post-doc session 🎓

• Fabio Maltoni (UCL)

Network meeting: Student and Post-doc session 🎓

• There are no conveners in this block

Network meeting: Student and Post-doc session 🎓

• There are no conveners in this block

Network meeting: Overview and discussion on the MTR

• Fabio Maltoni (UCL)

Network meeting: Student and Post-doc only session 🤓

• There are no conveners in this block

27. Hard diffraction in photoproduction

Christine Rasmussen

23/01/2019, 11:00

We present a new framework for modeling hard diffractive events in
photoproduction, implemented in Pythia 8.

35. String shoving in Heavy ions: Few ideas

Ms Smita Chakraborty (Lund University)

23/01/2019, 11:20

We introduce a symmetric frame to study the interactions of a system of two strings for the string shoving mechanism within the Lund model. Considering all such pairs of string pieces in a collision, the resulting total momentum change on all such string pieces will be calculated.

33. Tuning of Merged Pythia

Leif Gellersen (Lund University)

23/01/2019, 11:40

Monte Carlo Event Generators are important tools to understand the physics of particle colliders. Due to the complexity of particle collisions and the limited ability of perturbative QCD to describe the low energy behavior of partons, we need phenomenological models to provide a complete prediction of many observables. A systematic tuning of model parameters based on experimental data allows...

34. Short-term internship at B12 consulting

Mr Luca Mantani

23/01/2019, 12:00

A report of my experience at the consulting company B12 in the MCnet program for non-academic secondments.

25. Four-jet DPS production in pp and pA collisions within the Pythia's framework

Oleh Fedkevych (Lund University )

25/01/2019, 09:00

In spite of the recent progress in both theoretical and experimental studies many aspects of multiple parton interactions (MPI) still require a detail investigation. In particular, double parton scattering (DPS) processes can play a dominant role for some specific kinematic regions of multi-jet production, especially in proton-nucleus (pA) collisions where the total DPS cross section...

29. A Parton-Level Simulation of Double Parton Scattering

Baptiste Cabouat (University of Manchester)

25/01/2019, 09:20

Multiple parton interactions and, more specifically, double parton scattering are usually suppressed by single parton scattering. However, in some specific regions of phase-space, the differential cross sections are comparable. Also, for a given final state, it might happen that the double parton scattering is the dominant contribution if the single parton scattering is suppressed by a higher...

26. Recursive Matrix-Element Corrections in the Vincia Helicity Shower

Andrew Lifson (Lund University)

25/01/2019, 09:40

The Vincia antenna shower is a plugin to Pythia which allows for multiple matrix-element corrections (MECs), as well as systematic shower uncertainty estimates. In this talk I will discuss the former, with a particular emphasis on how we used maximally-helicity-violating (MHV) amplitudes for the MECs. Finally, I will show a new ATLAS result for gluon splitting to b quarks which appears to...

31. Multiple emission kernels for parton showers

Emma Simpson Dore (KIT)

25/01/2019, 10:00

The future of parton showers is centered around increasing the accuracy and comparison to data especially as higher precision and higher orders become more important. In this talk I will present my work on the determination of emission kernels, focusing on the two emission case, and some of the necessary steps involved in the process.

28. SingularPhasespace event generator

Mr Kiran Ostrolenk

25/01/2019, 11:00

I present SingularPhasepace, a new hard process event generator soon to be implemented in Herwig. It will generate events that push steadily into a singular limit, whilst keeping as much fixed as possible. This will make it easier to test and validate Herwig's use of Matrix Elements and the Dipole Subtraction algorithm.

32. Top-quark effects in diphoton production through gluon fusion at NLO in QCD

Xiaoran Zhao (CP3)

25/01/2019, 11:20

We calculated the NLO QCD corrections to diphoton production through gluon fusion at the LHC, including both light quarks and the top quark. The two-loop amplitudes involving the top quark loop are evaluated through numerical methods proposed recently. We found that NLO QCD corrections are large, and the inclusion of top quark affects the results dramatically.

30. Bounding the Higgs width through interference effects

Enrico Bothmann (ITP Göttingen)

25/01/2019, 11:40

I review an ongoing pheno study, in which my collaborators and I explore if the experimental bounds on the Higgs decay width could potentially be improved by exploiting interference effects of the $pp \to H \to \gamma\gamma$ signal with the $pp \to \gamma\gamma$ continuum background. We use particle-level simulated data using SHERPA and a complete likelihood analysis to derive the expected...

36. Studies of SM Monte Carlo and particle-level measurements in constraining new physics

Danping Joanna Huang

25/01/2019, 12:00

As a joint task between MCnet and ATLAS, I will present the results of vector boson production in association with jets in the Herwig7 event generator, with multi-jet merging at next-to-leading order (NLO) accuracy. Next I introduce the idea of unfolding a detector level measurement and the ATLAS 4-lepton analysis. Finally, I will discuss how precision Monte Carlo predictions can be used...