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Title: Measurement of prompt and nonprompt charmonium suppression in PbPb collisions at 5.02 TeV

Abstract

The nuclear modification factors of J/$$\psi$$ and $$\psi$$(2S) mesons are measured in PbPb collisions at a centre-of-mass energy per nucleon pair of $$\sqrt{s_{\mathrm{NN}}} =$$ 5.02 TeV. The analysis is based on PbPb and pp data samples collected by CMS at the LHC in 2015, corresponding to integrated luminosities of 464 $$\mu$$b$$^{-1}$$ and 28 pb$$^{-1}$$, respectively. The measurements are performed in the dimuon rapidity range of $|y| <$ 2.4 as a function of centrality, rapidity, and transverse momentum (p$$_\mathrm{T}$$) from p$$_\mathrm{T}=$$ 3 GeV/$c$ in the most forward region and up to 50 GeV/$c$. Both prompt and nonprompt (coming from b hadron decays) mesons are observed to be increasingly suppressed with centrality, with a magnitude similar to the one observed at $$\sqrt{s_{\mathrm{NN}}}=$$ 2.76 TeV for the two J/$$\psi$$ meson components. No dependence on rapidity is observed for either prompt or nonprompt J/$$\psi$$ mesons. An indication of a lower prompt J/$$\psi$$ meson suppression at high p$$_\mathrm{T}$$ is seen with respect to that observed at intermediate p$$_\mathrm{T}$$. The prompt $$\psi$$(2S) meson yield is found to be more suppressed than that of the prompt J/$$\psi$$ mesons in the entire p$$_\mathrm{T}$$ range.

Authors:
;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS
OSTI Identifier:
1415824
Report Number(s):
FERMILAB-PUB-17-616-CMS; CMS-HIN-16-025; CERN-EP-2017-308; arXiv:1712.08959
1644903
DOE Contract Number:
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Sirunyan, Albert M, and et al. Measurement of prompt and nonprompt charmonium suppression in PbPb collisions at 5.02 TeV. United States: N. p., 2017. Web.
Sirunyan, Albert M, & et al. Measurement of prompt and nonprompt charmonium suppression in PbPb collisions at 5.02 TeV. United States.
Sirunyan, Albert M, and et al. Sun . "Measurement of prompt and nonprompt charmonium suppression in PbPb collisions at 5.02 TeV". United States. doi:. https://www.osti.gov/servlets/purl/1415824.
@article{osti_1415824,
title = {Measurement of prompt and nonprompt charmonium suppression in PbPb collisions at 5.02 TeV},
author = {Sirunyan, Albert M and et al.},
abstractNote = {The nuclear modification factors of J/$\psi$ and $\psi$(2S) mesons are measured in PbPb collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}} =$ 5.02 TeV. The analysis is based on PbPb and pp data samples collected by CMS at the LHC in 2015, corresponding to integrated luminosities of 464 $\mu$b$^{-1}$ and 28 pb$^{-1}$, respectively. The measurements are performed in the dimuon rapidity range of $|y| <$ 2.4 as a function of centrality, rapidity, and transverse momentum (p$_\mathrm{T}$) from p$_\mathrm{T}=$ 3 GeV/$c$ in the most forward region and up to 50 GeV/$c$. Both prompt and nonprompt (coming from b hadron decays) mesons are observed to be increasingly suppressed with centrality, with a magnitude similar to the one observed at $\sqrt{s_{\mathrm{NN}}}=$ 2.76 TeV for the two J/$\psi$ meson components. No dependence on rapidity is observed for either prompt or nonprompt J/$\psi$ mesons. An indication of a lower prompt J/$\psi$ meson suppression at high p$_\mathrm{T}$ is seen with respect to that observed at intermediate p$_\mathrm{T}$. The prompt $\psi$(2S) meson yield is found to be more suppressed than that of the prompt J/$\psi$ mesons in the entire p$_\mathrm{T}$ range.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {Sun Dec 24 00:00:00 EST 2017},
month = {Sun Dec 24 00:00:00 EST 2017}
}