A measurement of the production of vector bottomonium states, ϒ(1S), ϒ(2S), and ϒ(3S), in Pb + Pb and pp collisions at a center-of-mass energy per nucleon pair of 5.02 TeV is presented. The data correspond to integrated luminosities of 1.38 nb−1 of Pb + Pb data collected in 2018, 0.44 nb−1 of Pb + Pb data collected in 2015, and 0.26 fb−1 of pp data collected in 2017 by the ATLAS detector at the Large Hadron Collider. The measurements are performed in the dimuon decay channel for transverse momentum pμμ T < 30 GeV, absolute rapidity |yμμ| < 1.5, and Pb + Pb event centrality 0–80%. The production rates of the three bottomonium states in Pb + Pb collisions are compared with those in pp collisions to extract the nuclear modification factors as functions of event centrality, pμμT , and |yμμ|. In addition, the suppression of the excited states relative to the ground state is studied. The results are compared with theoretical model calculations.

Production of Υ(nS) mesons in Pb+Pb and pp collisions at 5.02 TeV

Centonze M. S.;Chiodini G.;Gorini E.;Grancagnolo S.;Gravili F. G.;Greco M.;Palazzo A.;Primavera M.;Spagnolo S.;Ventura A.;
2023-01-01

Abstract

A measurement of the production of vector bottomonium states, ϒ(1S), ϒ(2S), and ϒ(3S), in Pb + Pb and pp collisions at a center-of-mass energy per nucleon pair of 5.02 TeV is presented. The data correspond to integrated luminosities of 1.38 nb−1 of Pb + Pb data collected in 2018, 0.44 nb−1 of Pb + Pb data collected in 2015, and 0.26 fb−1 of pp data collected in 2017 by the ATLAS detector at the Large Hadron Collider. The measurements are performed in the dimuon decay channel for transverse momentum pμμ T < 30 GeV, absolute rapidity |yμμ| < 1.5, and Pb + Pb event centrality 0–80%. The production rates of the three bottomonium states in Pb + Pb collisions are compared with those in pp collisions to extract the nuclear modification factors as functions of event centrality, pμμT , and |yμμ|. In addition, the suppression of the excited states relative to the ground state is studied. The results are compared with theoretical model calculations.
File in questo prodotto:
File Dimensione Formato  
prc107e.pdf

accesso aperto

Tipologia: Versione editoriale
Licenza: Creative commons
Dimensione 2.94 MB
Formato Adobe PDF
2.94 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11587/490284
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 7
  • ???jsp.display-item.citation.isi??? 2
social impact