Evidence for X(3872) in Pb-Pb collisions and studies of its prompt production at  √s NN = 5.02 TeV

Sirunyan, A. M.; Işıldak, Bora

dc.contributor.author	Sirunyan, A. M.
dc.contributor.author	Işıldak, Bora
dc.date.accessioned	2023-08-03T09:32:58Z
dc.date.available	2023-08-03T09:32:58Z
dc.date.issued	2022-01-19
dc.identifier.issn	0031-9007	en_US
dc.identifier.uri	http://hdl.handle.net/10679/8553
dc.identifier.uri	https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.128.032001
dc.description.abstract	The first evidence for X(3872) production in relativistic heavy ion collisions is reported. The X(3872) production is studied in lead-lead (Pb-Pb) collisions at a center-of-mass energy of √ s NN = 5.02 TeV per nucleon pair, using the decay chain X ( 3872 ) → J / ψ π + π − → μ + μ − π + π − . The data were recorded with the CMS detector in 2018 and correspond to an integrated luminosity of 1.7 nb − 1 . The measurement is performed in the rapidity and transverse momentum ranges \| y \| < 1.6 and 15 < p T < 50 GeV / c . The significance of the inclusive X(3872) signal is 4.2 standard deviations. The prompt X(3872) to ψ 2 S yield ratio is found to be ρ Pb − Pb = 1.08 ± 0.49 ( stat ) ± 0.52 ( syst ) , to be compared with typical values of 0.1 for p p collisions. This result provides a unique experimental input to theoretical models of the X(3872) production mechanism, and of the nature of this exotic state.	en_US
dc.description.sponsorship	BMBWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, FAPERGS, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES and CSF (Croatia); RIF (Cyprus); SENESCYT (Ecuador); MoER, ERC PUT and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); NKFIA (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); MES (Latvia); LAS (Lithuania); MOE and UM (Malaysia); BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico); MOS (Montenegro); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS, RFBR, and NRC KI (Russia); MESTD (Serbia); SEIDI, CPAN, PCTI, and FEDER (Spain); MOSTR (Sri Lanka); Swiss Funding Agencies (Switzerland); MST (Taipei); ThEPCenter, IPST, STAR, and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU (Ukraine); STFC (United Kingdom); DOE and NSF (USA). Individuals have received support from the Marie-Curie program and the European Research Council and Horizon 2020 Grant, Contracts No. 675440, No. 724704, No. 752730, and No. 765710 (European Union); the Leventis Foundation; the Alfred P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the F. R. S.-FNRS and FWO (Belgium) under the "Excellence of Science-EOS"-be.h Project No. 30820817; the Beijing Municipal Science & Technology Commission, No. Z191100007219010; the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Deutsche Forschungsgemeinschaft (DFG), under Germany's Excellence Strategy-EXC 2121 "Quantum Universe"-390833306, and under project number 400140256-GRK2497; the Lendulet ("Momentum") Program and the Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences, the New National Excellence Program UNKP, the NKFIA research grants 123842, 123959, 124845, 124850, 125105, 128713, 128786, and 129058 (Hungary); the Council of Science and Industrial Research, India; the Ministry of Science and Higher Education and the National Science Center, contracts Opus 2014/15/B/ST2/03998 and 2015/19/B/ST2/02861 (Poland); the National Priorities Research Program by Qatar National Research Fund; the Ministry of Science and Higher Education, Project No. 0723-2020-0041 (Russia); the Programa Estatal de Fomento de la Investigacion Cientifica y T ' ecnica de Excelencia Maria de Maeztu, grant MDM-2015-0509 and the Programa Severo Ochoa del Principado de Asturias; the Thalis and Aristeia programs cofinanced by EU-ESF and the Greek NSRF; the Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University and the Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand); the Kavli Foundation; the Nvidia Corporation; the SuperMicro Corporation; the Welch Foundation, Contract C-1845; and the Weston Havens Foundation (USA).
dc.language.iso	eng	en_US
dc.publisher	American Physical Society	en_US
dc.relation.ispartof	Physical Review Letters
dc.rights	Attribution 4.0 International	*
dc.rights	openAccess
dc.rights.uri	http://creativecommons.org/licenses/by/4.0/	*
dc.title	Evidence for X(3872) in Pb-Pb collisions and studies of its prompt production at √s NN = 5.02 TeV	en_US
dc.type	Article	en_US
dc.description.version	Publisher version	en_US
dc.peerreviewed	yes	en_US
dc.publicationstatus	Published	en_US
dc.contributor.department	Özyeğin University
dc.contributor.authorID	(ORCID 0000-0002-0283-5234 & YÖK ID 124605) Işıldak, Bora
dc.contributor.ozuauthor	Işıldak, Bora
dc.creator	The CMS Collaboration
dc.identifier.volume	128	en_US
dc.identifier.issue	3	en_US
dc.identifier.wos	WOS:000748799800002
dc.identifier.doi	10.1103/PhysRevLett.128.032001	en_US
dc.identifier.scopus	SCOPUS:2-s2.0-85123710396
dc.relation.publicationcategory	Article - International Refereed Journal - Institutional Academic Staff