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Title: Measurement of Prompt $$\psi(2S) \to J/\psi$$ Yield Ratios in Pb-Pb and $p-p$ Collisions at $$\sqrt {s_{NN}}=$$ 2.76 TeV

Abstract

The ratio between the prompt ψ(2S) and J/ψ yields, reconstructed via their decays into μ +μ -, is measured in Pb-Pb and p-p collisions at √s NN=2.76 TeV. Likewise, the analysis is based on Pb-Pb and p-p data samples collected by CMS at the Large Hadron Collider, corresponding to integrated luminosities of 150 μb -1 and 5.4 pb -1, respectively. The double ratio of measured yields (N ψ(2S)/N J/ψ) Pb-Pb/(Nψ(2S)/N J/ψ) p-p is computed in three Pb-Pb collision centrality bins and two kinematic ranges: one at midrapidity, |y|<1.6, covering the transverse momentum range 6.5T<30 GeV/c, and the other at forward rapidity, 1.6<|y|<2.4, extending to lower p T values, 3T<30 GeV/c. Furthermore, the centrality-integrated double ratio changes from 0.45±0.13(stat)±0.07(syst) in the first range to 1.67±0.34(stat)±0.27(syst) in the second. This difference is most pronounced in the most central collisions.

Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI) (Armenia). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5)
Contributing Org.:
CMS Collaboration
OSTI Identifier:
1180945
Alternate Identifier(s):
OSTI ID: 1234853
Report Number(s):
FERMILAB-PUB-14-445-CMS; CERN-PH-EP-2014-240; CMS-HIN-12-007
Journal ID: ISSN 0031-9007; arXiv eprint number arXiv:1410.1804; TRN: US1600800
Grant/Contract Number:
AC02-07CH11359
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 113; Journal Issue: 26; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Khachatryan, Vardan. Measurement of Prompt $\psi(2S) \to J/\psi$ Yield Ratios in Pb-Pb and $p-p$ Collisions at $\sqrt {s_{NN}}=$ 2.76 TeV. United States: N. p., 2014. Web. doi:10.1103/PhysRevLett.113.262301.
Khachatryan, Vardan. Measurement of Prompt $\psi(2S) \to J/\psi$ Yield Ratios in Pb-Pb and $p-p$ Collisions at $\sqrt {s_{NN}}=$ 2.76 TeV. United States. doi:10.1103/PhysRevLett.113.262301.
Khachatryan, Vardan. Wed . "Measurement of Prompt $\psi(2S) \to J/\psi$ Yield Ratios in Pb-Pb and $p-p$ Collisions at $\sqrt {s_{NN}}=$ 2.76 TeV". United States. doi:10.1103/PhysRevLett.113.262301.
@article{osti_1180945,
title = {Measurement of Prompt $\psi(2S) \to J/\psi$ Yield Ratios in Pb-Pb and $p-p$ Collisions at $\sqrt {s_{NN}}=$ 2.76 TeV},
author = {Khachatryan, Vardan},
abstractNote = {The ratio between the prompt ψ(2S) and J/ψ yields, reconstructed via their decays into μ+μ-, is measured in Pb-Pb and p-p collisions at √sNN=2.76 TeV. Likewise, the analysis is based on Pb-Pb and p-p data samples collected by CMS at the Large Hadron Collider, corresponding to integrated luminosities of 150 μb-1 and 5.4 pb-1, respectively. The double ratio of measured yields (Nψ(2S)/NJ/ψ)Pb-Pb/(Nψ(2S)/NJ/ψ)p-p is computed in three Pb-Pb collision centrality bins and two kinematic ranges: one at midrapidity, |y|<1.6, covering the transverse momentum range 6.5T<30 GeV/c, and the other at forward rapidity, 1.6<|y|<2.4, extending to lower pT values, 3T<30 GeV/c. Furthermore, the centrality-integrated double ratio changes from 0.45±0.13(stat)±0.07(syst) in the first range to 1.67±0.34(stat)±0.27(syst) in the second. This difference is most pronounced in the most central collisions.},
doi = {10.1103/PhysRevLett.113.262301},
journal = {Physical Review Letters},
number = 26,
volume = 113,
place = {United States},
year = {Wed Dec 31 00:00:00 EST 2014},
month = {Wed Dec 31 00:00:00 EST 2014}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevLett.113.262301

Citation Metrics:
Cited by: 19 works
Citation information provided by
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