Measurement of prompt and nonprompt charmonium suppression in $$\text {PbPb}$$ collisions at 5.02 $$\,\text {Te}\text {V}$$
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· Eur.Phys.J.C
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The nuclear modification factors of $${\mathrm {J}/\psi }$$ and $$\psi \text {(2S)}$$ mesons are measured in $$\text {PbPb}$$ collisions at a centre-of-mass energy per nucleon pair of $$\sqrt{\smash [b]{s_{_{\text {NN}}}}} = 5.02\,\text {Te}\text {V} $$ . The analysis is based on $$\text {PbPb}$$ and $$\mathrm {p}\mathrm {p}$$ data samples collected by CMS at the LHC in 2015, corresponding to integrated luminosities of 464 $$\,\mu \mathrm {b}^{-1}$$ and 28 $$\,\text {pb}^\text {-1}$$ , 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 $$p_{\mathrm {T}} =3$$ $${\,\text {Ge}\text {V}/}\text {c}$$ in the most forward region and up to 50 $${\,\text {Ge}\text {V}/}\text {c}$$ . Both prompt and nonprompt (coming from b hadron decays) $${\mathrm {J}/\psi }$$ mesons are observed to be increasingly suppressed with centrality, with a magnitude similar to the one observed at $$\sqrt{\smash [b]{s_{_{\text {NN}}}}} = 2.76\,\text {Te}\text {V} $$ for the two $${\mathrm {J}/\psi }$$ meson components. No dependence on rapidity is observed for either prompt or nonprompt $${\mathrm {J}/\psi }$$ mesons. An indication of a lower prompt $${\mathrm {J}/\psi }$$ meson suppression at $$p_{\mathrm {T}} > 25$$ $${\,\text {Ge}\text {V}/}\text {c}$$ is seen with respect to that observed at intermediate $$p_{\mathrm {T}}$$ . The prompt $$\psi \text {(2S)}$$ meson yield is found to be more suppressed than that of the prompt $${\mathrm {J}/\psi }$$ mesons in the entire $$p_{\mathrm {T}}$$ range.
- Research Organization:
- ABC Federal U.; Aachen, Tech. Hochsch.; Adiyaman U.; Ain Shams U., Cairo; Alabama U.; Andes U., Bogota; Antwerp U.; Athens U.; Auckland U.; Bangalore, Indian Inst. Sci.; Bari Polytechnic; Bari U.; Basilicata U., Potenza; Baylor U.; BeiHang U.; Beijing, Inst. High Energy Phys.; Belgrade U.; Beykent U.; Bhabha Atomic Res. Ctr.; Bhubaneswar, Inst. Phys.; Bhubaneswar, NISER; Bingöl U.; Bogazici U.; Bologna U.; Boskovic Inst., Zagreb; Boston U.; Brandenburg Tech. U.; Bristol U.; British U. in Egypt; Brown U.; Brunel U.; Brussels U.; Budapest, RMKI; CC, Villeurbanne; CERN; CHEP, Taegu; CINVESTAV, IPN; Cag U., Mersin; Cairo, Acad. Sci. Res. Tech.; Caltech; Cantabria Inst. of Phys.; Canterbury U.; Carnegie Mellon U.; Catania U.; Catholic U. America; Charles U.; Chonbuk Natl. U.; Chonnam Natl. U.; Chulalongkorn U.; Colorado U.; Conacyt, Mexico; Cornell U.; Cukurova U.; Cyprus U.; DESY; Debrecen, Inst. Nucl. Res.; Delhi U.; Democritos Nucl. Res. Ctr.; Dubna, JINR; Ecole Polytechnique; Eotvos U.; Erzincan U.; Fayoum U.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Florence U.; Florida Inst. Tech.; Florida Intl. U.; Florida State U.; Florida U.; Frascati; GTU, Tbilisi; Gaziosmanpasa U.; Genoa U.; Gent U.; Guglielmo Marconi U.; Hamburg U.; Hanyang U.; Haute Alsace U.; Helsinki Inst. of Phys.; Helsinki U.; IAC, La Laguna; IISER, Pune; IIUM, Kuala Lumpur; INFN, Bari; INFN, Bologna; INFN, Catania; INFN, Florence; INFN, Genoa; INFN, Milan Bicocca; INFN, Naples; INFN, Padua; INFN, Pavia; INFN, Perugia; INFN, Pisa; INFN, Rome; INFN, Trieste; INFN, Turin; IPM, Tehran; IRFU, Saclay; Iberoamericana U.; Illinois U., Chicago; Imperial Coll., London; Indian Inst. Tech., Bhubaneswar; Indian Inst. Tech., Madras; Inst. Scintill. Mat., Kharkiv; Ioannina U.; Iowa U.; Isfahan Tech. U.; Islamic Azad U., Sci. Res. Branch, Tehran; Istanbul Aydin U.; Istanbul Bilgi U.; Istanbul, Tech. U.; Izmir Inst. Tech.; Johns Hopkins U.; KIT, Karlsruhe, EKP; Kafkas U.; Kansas State U.; Kansas U.; Kharkov, KIPT; Korea U.; LIP, Lisbon; Lappeenranta U. Tech.; Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Lebedev Inst.; Louvain U.; Lyon, IPN; MIT; MOSTI, Malaysian Nucl. Agency, Kajang; Madrid, Autonoma U.; Madrid, CIEMAT; Malaya U.; Marmara U.; Maryland U.; Mersin U.; Middle East Tech. U., Ankara; Milan Bicocca U.; Mimar Sinan U.; Minnesota U.; Minsk, Inst. Nucl. Problems; Mississippi U.; Moscow Phys. Eng. Inst.; Moscow State U.; Moscow, INR; Moscow, ITEP; Moscow, MIPT; NCBJ, Swierk; NICPB, Tallinn; Naples U.; Natl. Tech. U., Athens; Nebraska U.; Necmettin Erbakan U., Konya; Northeastern U.; Northwestern U.; Notre Dame U.; Novosibirsk State U.; Novosibirsk, IYF; Ohio State U.; Oviedo U.; PSI, Villigen; Padua U.; Panjab U.; Pavia U.; Peking U.; Pelotas U.; Perugia U.; Piemonte Orientale U., Novara; Piri Reis U., Istanbul; Pisa U.; Pisa, Scuola Normale Superiore; Princeton U.; Puebla U., Inst. Fis.; Puerto Rico U., Mayaguez; Purdue U.; Purdue U., Calumet; Quaid-i-Azam U.; Rice U.; Riga Tech. U.; Rio de Janeiro State U.; Rio de Janeiro, CBPF; Rochester U.; Rockefeller U.; Rome U.; Ruhuna U.; Rutgers U., Piscataway; Rutherford; SUNY, Buffalo; Saha Inst.; San Francisco de Quito U.; San Luis Potosi U.; Sao Paulo, IFT; Seoul Natl. U.; Seoul U.; Serpukhov, IHEP; Siena U.; Sinop U.; Sofiya U.; Sofiya, Inst. Nucl. Res.; Southampton U.; Split Tech. U.; Split U.; St. Petersburg Polytechnic Inst.; St. Petersburg, INP; Stefan Meyer Inst. Subatomare Phys.; Strasbourg, IPHC; Sungkyunkwan U.; TIFR, Mumbai, DHEP; TU Vienna; Taiwan, Natl. Central U.; Taiwan, Natl. Taiwan U.; Tashkent, IYF; Tbilisi State U.; Tennessee U.; Texas A&M U. Qatar, Doha; Texas A-M; Texas Tech.; Trieste U.; Tsinghua U., Beijing; Turin U.; U. Campinas; U. Debrecen, Inst. Phys.; UC, Davis; UC, Riverside; UC, San Diego; UC, Santa Barbara; UCLA; University Coll., Dublin; Utah Valley U.; VINCA Inst. Nucl. Sci., Belgrade; Vanderbilt U.; Vienna, OAW; Vilnius U.; Virginia U.; Visva Bharati U.; Vrije U., Brussels; Warsaw U.; Warsaw U. of Tech.; Wayne State U.; Wisconsin U., Madison; Yazd U.; Yerevan Phys. Inst.; Zurich U.; Zurich, ETH
- Sponsoring Organization:
- US Department of Energy
- Grant/Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1415824
- Report Number(s):
- CERN-EP-2017-308; CMS-HIN-16-025; FERMILAB-PUB-17-616-CMS; oai:inspirehep.net:1644903; arXiv:1712.08959
- Journal Information:
- Eur.Phys.J.C, Journal Name: Eur.Phys.J.C Journal Issue: 6 Vol. 78
- Country of Publication:
- United States
- Language:
- English
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