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- Title
Study of Transverse-Spherocity Biased pp Collisions at the LHC Energies Using the PYTHIA 8 Event Generator.
- Authors
Ortiz, Antonio; Valencia Palomo, Lizardo; Minjares Neriz, Victor Manuel
- Abstract
The ALICE collaboration recently reported the mean transverse momentum as a function of charged-particle multiplicity for different pp-collision classes defined based on the "jettiness" of the event. The event "jettiness" is quantified using transverse spherocity that is measured at midpseudorapidity ( | η | < 0.8 ) considering charged particles with transverse momentum within 0.15 < p T < 10 GeV/c. Comparisons to PYTHIA 8 (tune Monash) predictions show a notable disagreement between the event generator and data for jetty events that increases as a function of charged-particle multiplicity. This paper reports on the origin of such a disagreement. Since at intermediate and high p T ( 2 < p T < 10 GeV/c), the spectral shape is expected to be modified by color reconnection or jets, their effects on the average p T are studied. The results indicate that the origin of the discrepancy is the overpredicted multijet yield by PYTHIA 8, which increases with the charged-particle multiplicity. This finding is important to understand the way transverse spherocity and multiplicity bias the pp collisions and how well models like PYTHIA 8 reproduce those biases. The studies are pertinent since transverse spherocity is currently used as an event classifier by experiments at the LHC.
- Subjects
ENERGY consumption; HADRON-hadron scattering; MULTIPLICITY (Mathematics); PARTICLE beams
- Publication
Universe (2218-1997), 2024, Vol 10, Issue 1, p30
- ISSN
2218-1997
- Publication type
Article
- DOI
10.3390/universe10010030