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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:33 |
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Conference: Bucharest University Faculty of Physics 2017 Meeting
Section: Nuclear and Elementary Particles Physics
Title:
COMPARISON OF COSMIC RAY COLLISIONS GENERATORS AND PYTHIA PREDICTIONS FOR PROTON-PROTON INTERACTIONS AT LHC ENERGIES
Authors:
Alexandru ENE (1,2), Alexandru JIPA (2)
*
Affiliation:
1) Department of Elementary Particle Physics, "Horia Hulubei" National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH)
2) Doctoral School of Physics, Faculty of Physics of the University of Bucharest
E-mail
alexandru.catalin.ene@cern.ch
Keywords:
cosmic rays, particle physics, phenomenological models, QCD, collider experiments, prompt particle production
Abstract:
The study of high energy cosmic rays has provided during the last hundred years or so crucial information to many branches of physics, including elementary particle physics, ultra-relativistic nuclear physics, astrophysics and even cosmology. Until the 1950’s, when powerful particle accelerators were built, the only sources of high energy particles were the aforementioned cosmic rays. The cosmic ray spectrum presents interesting structures like the ”knees” and ”ankle” which could constitute a clue for finding the sources of the ultra-high energy cosmic rays. Another important source of information about elementary particles are, of course, the collider experiments. The most powerful collider ever built is the Large Hadron Collider, reaching energies of 13 TeV in the center of mass frame or about 10^17 eV (9×10^16 eV) in the lab frame, an energy close to the one at which the cosmic ray spectrum second ”knee” is found. Given that the processes involved in pp interactions with a few exceptions (hard processes and high energy showers) imply non-perturbative QCD, we rely on phenomenological models for predictions. For the improvement of the existing models thorough testing should be conducted, involving as much experimental data as possible and various sets of tunes to such data. In this work we have compared the predictions obtained with EPOS LHC, QGSJET-II-04 and SIBYLL 2.3 generators included in the CRMC package and the standard collider physics generator PYTHIA (versions 8.186 and 8.219) for pp interactions at sqrt(s) = 7 TeV with data from the LHCb experiment and with predictions at sqrt(s) = 13 TeV. This comparison study treats five distinct aspects of prompt particle production: energy flow, charged-particle distributions, charged-hadron production ratios, V^0 ratios and strange particle distributions.
Acknowledgement:
I would like to thank Florin Maciuc, Ph.D., the leader of the Romanian LHCb Group, Alexandru Grecu, Ph.D., deputy leader of the Romanian LHCb Group and Dr.Prof.Alexandru Jipa, my Ph.D. supervising professor for their guidance and help throughout this study. I would also like to thank my colleagues from the Romanian LHCb group for their tips and helpful discussions. 1 would like to acknowledge the efforts of T. Pierog, C. Baus, and R. Ulrich to create the CRMC interface. This work has been financially supported through the projects Proiect IDEI 56/07.10.2011 and Proiectul Cooperare România-CERN 7/16.03.2016 (LHCb).
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