9th International Workshop on Multiple Partonic Interactions at the LHC

Session

WG2: MC Development and Tuning

11 Dec 2017, 14:30

Conference Hall (Hotel Peterhoff, Shimla, India)

Conveners

WG2: MC Development and Tuning

• Paolo Gunnellini (Deutsches Elektronen-Synchrotron (DE))
• Stefan Gieseke

WG2: MC Development and Tuning

• Paolo Gunnellini (Deutsches Elektronen-Synchrotron (DE))
• Stefan Gieseke

WG2: MC Development and Tuning

• There are no conveners in this block

WG2: MC Development and Tuning

• There are no conveners in this block

Presentation materials

instruction_MCTutorial.txt

73. MC Tutorial - Part I

Deepak Kar (University of the Witwatersrand (ZA)), Stefan Gieseke

11/12/2017, 14:30

Monte Carlo Tutorial - Part I

74. MC Tutorial - Part II

Deepak Kar (University of the Witwatersrand (ZA)), Stefan Gieseke

11/12/2017, 17:00

Monte Carlo Tutorial - Part II

19. The Lund string in dense environments

Leif Lönnblad (Lund University (SE))

12/12/2017, 09:00

In hot and dense environments both in heavy ion collisions and high multiplicity proton-proton events, Lund string fragmentation must be modified to take into account effects from the interaction between strings prior to and in the hadronisation. One such modification is colour reconnections, where oppositely directed colour fields may cancel eachother. But there is also a possibility for the...

35. MPI in EPOS

Klaus Werner

12/12/2017, 09:20

EPOS is a "unified approach" for simulating small and big systems (pp to heavy ions), in all cases implementing initial multiple scatterings and final state interactions, the latter ones being essentially a hydrodynamical evolution of the core part. We report about recent developments of the EPOS approach, aiming to understand the transition from small to big systems.

68. An approach to test the core-corona model using multiplicity dependent particle production at LHC energies

Gyula Bencedi (Hungarian Academy of Sciences (HU))

12/12/2017, 09:40

The core-corona picture implemented in the EPOS~3 model has successfully described the multiplcity dependence of particle production in proton--proton (pp) and proton--nucleus collisions at LHC energies.
The inclusion of viscous hydrodynamics plays a key role in describing the observed features of data. It suggests an interpretation of new phenomena assuming the formation of a small drop of...

36. QCD Monte-Carlo model tuning studies with CMS data at 13 TeV

Deniz Sunar Cerci (Adiyaman University (TR))

12/12/2017, 10:00

New CMS PYTHIA 8 event tunes are presented. The new tunes are obtained using minimum bias and underlying event observables using Monte Carlo configurations with consistent parton distribution functions and strong coupling constant values in the matrix element and the parton shower. Validation and performance studies are presented by comparing the predictions of the new tune to various soft-...

11. Studies of Top Quark Monte Carlo Modelling

Lily Asquith (University of Sussex (UK))

12/12/2017, 10:20

The status of recent studies of modern Monte Carlo generator setups for the pair production of top quarks at the LHC. Samples at a center of mass energy of 13 TeV have been generated for a variety of generators and with different generator configurations.  The predictions from these sample are compared to ATLAS data for a variety of kinematic observables.

12. Studies of Monte Carlo modelling of Jets

Deepak Kar (University of the Witwatersrand (ZA))

12/12/2017, 10:40

The predictions of different Monte Carlo generators for QCD jet production, both in multijets and for jets produced in association with other objects, are presented. Recent improvements in showering Monte Carlos provide new tools for assessing systematic uncertainties associated with these jets.  Studies of the dependence of physical observables on the choice of shower tune parameters and new...

34. Soft interactions in Herwig

Patrick Kirchgaesser

14/12/2017, 13:40

We review the current model for soft interactions which is based on multiperipheral particle kinematics in the Monte Carlo event generator Herwig 7.
Furthermore we investigate the consequences of additional modifications related to
soft physics in pp collisions with respect to hadronic flavour observables.

18. Heavy Ions in Pythia8

Leif Lönnblad (Lund University (SE))

14/12/2017, 14:00

Angantyr is a new model for collisions involving heavy nuclei in Pythia8. It is inspired by the old Fritiof model, but includes more perturbative physics and a more careful consideration of fluctuations in nucleon-nucleon cross sections, and the related diffractive processes. In the current implementation in Pythia8 parton-level nucleon-nucleon minimum bias events are stacked together and...

37. CMS underlying event and double parton scattering tunes

Manisha Manisha (Panjab University (IN))

14/12/2017, 14:20

Several new double parton scattering (DPS) tunes are constructed in order to investigate the compatibility between the values of the UE parameters determined from fitting UE observables and the values determined from fitting DPS-sensitive observables. In addition, the predictions of the DPS-based tunes are tested against UE observables at 13 TeV.

38. Tuning of color reconnection models with CMS data at 7 and 13 TeV

Paolo Gunnellini (Deutsches Elektronen-Synchrotron (DE))

14/12/2017, 14:40

A study of the latest color-reconnection models in QCD is performed with CMS data. The so called MPI-based, QCD-inspired and gluon-move models are studied within Pythia8, and the tuning parameters for the color reconnection and multiple parton interactions are extracted simultaneously from data. The different tunes are compared with top quark distributions.

58. Sartre, a dipole model generator for the Electron Ion Collider

Tobias Toll

14/12/2017, 15:00

I will present the Sartre event generator. It is using the bSat Dipole Model at its core and can simulate exclusive diffraction in ep and eA as well as ultra peripheral collisions in pp, pA, and AA collisions. It has a mechanism for varying the nuclear configurations thereby providing both coherent and incoherent cross-sections for photon-nucleus interactions, and in the latter case uses FLUKA...

83. follow up of the MC Tutorial - Students' talk

14/12/2017, 15:20