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| Main Authors: | , , |
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| Format: | Preprint |
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2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2310.20406 |
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| _version_ | 1866917565071097856 |
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| author | Ortiz, Antonio Palomo, Lizardo Valencia Neriz, Victor Manuel Minjares |
| author_facet | Ortiz, Antonio Palomo, Lizardo Valencia Neriz, Victor Manuel Minjares |
| contents | The ALICE collaboration recently reported the mean transverse momentum as a function of charged-particle multiplicity for different pp-collisions 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 $0.15<p_{\rm T}<10$ 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 using PYTHIA 8 event generator. Since at intermediate and high $p_{\rm T}$ ($2<p_{\rm T}<10$ GeV/$c$), the spectral shape is expected to be modified by color reconnection or jets, their effects on the average $p_{\rm T}$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_20406 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Understanding the transverse-spherocity biased data from pp collisions at the LHC energies Ortiz, Antonio Palomo, Lizardo Valencia Neriz, Victor Manuel Minjares High Energy Physics - Phenomenology Nuclear Experiment The ALICE collaboration recently reported the mean transverse momentum as a function of charged-particle multiplicity for different pp-collisions 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 $0.15<p_{\rm T}<10$ 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 using PYTHIA 8 event generator. Since at intermediate and high $p_{\rm T}$ ($2<p_{\rm T}<10$ GeV/$c$), the spectral shape is expected to be modified by color reconnection or jets, their effects on the average $p_{\rm T}$ 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. |
| title | Understanding the transverse-spherocity biased data from pp collisions at the LHC energies |
| topic | High Energy Physics - Phenomenology Nuclear Experiment |
| url | https://arxiv.org/abs/2310.20406 |