Measurements of Υ states production in p plus p collisions at √s=500 GeV with STAR: Cross sections, ratios, and multiplicity dependence

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F25%3A00642348" target="_blank" >RIV/61389005:_____/25:00642348 - isvavai.cz</a>

Výsledek na webu

<a href="https://journals.aps.org/prd/abstract/10.1103/bsyx-qtjp" target="_blank" >https://journals.aps.org/prd/abstract/10.1103/bsyx-qtjp</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/bsyx-qtjp" target="_blank" >10.1103/bsyx-qtjp</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Measurements of Υ states production in p plus p collisions at √s=500 GeV with STAR: Cross sections, ratios, and multiplicity dependence

Popis výsledku v původním jazyce

We report measurements of Upsilon(1S), Upsilon(2S) and Upsilon(3S) production in p thorn p collisions at root sp = 500 GeV by the STAR experiment in year 2011, corresponding to an integrated luminosity Lint = 13 pb-1. The results provide precise cross sections, transverse momentum (pT) and rapidity (y) spectra, as well as cross section ratios for p(T) < 10 GeV=c and vertical bar y vertical bar < 1. The dependence of the Upsilon yield on charged particle multiplicity has also been measured, offering new insights into the mechanisms of quarkonium production. The data are compared to various theoretical models: the color evaporation model (CEM) accurately describes the Upsilon(1S) production, while the color glass condensate thorn nonrelativistic quantum chromodynamics (CGC thorn NRQCD) model overestimates the data, particularly at low p(T). Conversely, the color singlet model (CSM) underestimates the rapidity dependence. These discrepancies highlight the need for further development in understanding the production dynamics of heavy quarkonia in high-energy hadronic collisions. The trend in the multiplicity dependence is consistent with CGC/saturation and string percolation models or Upsilon production happening in multiple parton interactions modeled by PYTHIA8.

Název v anglickém jazyce

Measurements of Υ states production in p plus p collisions at √s=500 GeV with STAR: Cross sections, ratios, and multiplicity dependence

Popis výsledku anglicky

We report measurements of Upsilon(1S), Upsilon(2S) and Upsilon(3S) production in p thorn p collisions at root sp = 500 GeV by the STAR experiment in year 2011, corresponding to an integrated luminosity Lint = 13 pb-1. The results provide precise cross sections, transverse momentum (pT) and rapidity (y) spectra, as well as cross section ratios for p(T) < 10 GeV=c and vertical bar y vertical bar < 1. The dependence of the Upsilon yield on charged particle multiplicity has also been measured, offering new insights into the mechanisms of quarkonium production. The data are compared to various theoretical models: the color evaporation model (CEM) accurately describes the Upsilon(1S) production, while the color glass condensate thorn nonrelativistic quantum chromodynamics (CGC thorn NRQCD) model overestimates the data, particularly at low p(T). Conversely, the color singlet model (CSM) underestimates the rapidity dependence. These discrepancies highlight the need for further development in understanding the production dynamics of heavy quarkonia in high-energy hadronic collisions. The trend in the multiplicity dependence is consistent with CGC/saturation and string percolation models or Upsilon production happening in multiple parton interactions modeled by PYTHIA8.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review D

ISSN

2470-0010

e-ISSN

2470-0029

Svazek periodika

112

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

032004

Kód UT WoS článku

001575564500001

EID výsledku v databázi Scopus

2-s2.0-105023227049