Suppression of Excited Υ States Relative to the Ground State in Pb-Pb Collisions at √sNN=5.02  TeV

CMS Collaboration

doi:10.1103/PhysRevLett.120.142301

Suppression of Excited Υ States Relative to the Ground State in Pb-Pb Collisions at √sNN=5.02 TeV

CMS Collaboration

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Abstract

The relative yields of Υ mesons produced in pp and Pb-Pb collisions at √sNN=5.02 TeV and reconstructed via the dimuon decay channel are measured using data collected by the CMS experiment. Double ratios are formed by comparing the yields of the excited states, Υ(2S) and Υ(3S), to the ground state, Υ(1S), in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios, [Υ(nS)/Υ(1S)]Pb−Pb/[Υ(nS)/Υ(1S)]pp, are measured to be 0.308±0.055(stat)±0.019(syst) for the Υ(2S) and less than 0.26 at 95% confidence level for the Υ(3S). No significant
Υ(3S) signal is found in the Pb-Pb data. The double ratios are studied as a function of collision centrality, as well as Υ transverse momentum and rapidity. No significant dependencies are observed.

Original language	English
Article number	142301
Number of pages	17
Journal	Physical Review Letters
Volume	120
Issue number	14
Early online date	2 Apr 2018
DOIs	https://doi.org/10.1103/PhysRevLett.120.142301
Publication status	Published - 6 Apr 2018

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@article{f6319102c12a4626860c999f7a525c3d,

title = "Suppression of Excited Υ States Relative to the Ground State in Pb-Pb Collisions at √sNN=5.02 TeV",

abstract = "The relative yields of Υ mesons produced in pp and Pb-Pb collisions at √sNN=5.02 TeV and reconstructed via the dimuon decay channel are measured using data collected by the CMS experiment. Double ratios are formed by comparing the yields of the excited states, Υ(2S) and Υ(3S), to the ground state, Υ(1S), in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios, [Υ(nS)/Υ(1S)]Pb−Pb/[Υ(nS)/Υ(1S)]pp, are measured to be 0.308±0.055(stat)±0.019(syst) for the Υ(2S) and less than 0.26 at 95\% confidence level for the Υ(3S). No significant Υ(3S) signal is found in the Pb-Pb data. The double ratios are studied as a function of collision centrality, as well as Υ transverse momentum and rapidity. No significant dependencies are observed.",

author = "\{CMS Collaboration\} and Lana Beck and Jim Brooke and Douglas Burns and Emyr Clement and David Cussans and H. Fl{\"a}cher and Joel Goldstein and Mark Grimes and Greg Heath and Helen Heath and Luke Kreczko and David Newbold and Sudarshan Paramesvaran and Tai Sakuma and \{Seif El Nasr\}, Sarah and Vincent Smith",

year = "2018",

month = apr,

day = "6",

doi = "10.1103/PhysRevLett.120.142301",

language = "English",

volume = "120",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society (APS)",

number = "14",

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TY - JOUR

T1 - Suppression of Excited Υ States Relative to the Ground State in Pb-Pb Collisions at √sNN=5.02 TeV

AU - CMS Collaboration

AU - Beck, Lana

AU - Brooke, Jim

AU - Burns, Douglas

AU - Clement, Emyr

AU - Cussans, David

AU - Flächer, H.

AU - Goldstein, Joel

AU - Grimes, Mark

AU - Heath, Greg

AU - Heath, Helen

AU - Kreczko, Luke

AU - Newbold, David

AU - Paramesvaran, Sudarshan

AU - Sakuma, Tai

AU - Seif El Nasr, Sarah

AU - Smith, Vincent

PY - 2018/4/6

Y1 - 2018/4/6

N2 - The relative yields of Υ mesons produced in pp and Pb-Pb collisions at √sNN=5.02 TeV and reconstructed via the dimuon decay channel are measured using data collected by the CMS experiment. Double ratios are formed by comparing the yields of the excited states, Υ(2S) and Υ(3S), to the ground state, Υ(1S), in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios, [Υ(nS)/Υ(1S)]Pb−Pb/[Υ(nS)/Υ(1S)]pp, are measured to be 0.308±0.055(stat)±0.019(syst) for the Υ(2S) and less than 0.26 at 95% confidence level for the Υ(3S). No significant Υ(3S) signal is found in the Pb-Pb data. The double ratios are studied as a function of collision centrality, as well as Υ transverse momentum and rapidity. No significant dependencies are observed.

AB - The relative yields of Υ mesons produced in pp and Pb-Pb collisions at √sNN=5.02 TeV and reconstructed via the dimuon decay channel are measured using data collected by the CMS experiment. Double ratios are formed by comparing the yields of the excited states, Υ(2S) and Υ(3S), to the ground state, Υ(1S), in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios, [Υ(nS)/Υ(1S)]Pb−Pb/[Υ(nS)/Υ(1S)]pp, are measured to be 0.308±0.055(stat)±0.019(syst) for the Υ(2S) and less than 0.26 at 95% confidence level for the Υ(3S). No significant Υ(3S) signal is found in the Pb-Pb data. The double ratios are studied as a function of collision centrality, as well as Υ transverse momentum and rapidity. No significant dependencies are observed.

U2 - 10.1103/PhysRevLett.120.142301

DO - 10.1103/PhysRevLett.120.142301

M3 - Article (Academic Journal)

C2 - 29694144

SN - 0031-9007

VL - 120

JO - Physical Review Letters

JF - Physical Review Letters

IS - 14

M1 - 142301

ER -

Suppression of Excited Υ States Relative to the Ground State in Pb-Pb Collisions at √sNN=5.02 TeV

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