Measurement of the relative prompt production rate of χ c2 and χ c1 in pp collisions at $\sqrt{s} = 7\ \mathrm{TeV}$
S. ChatrchyanEuropean Organization for Nuclear Research, Geneva, SwitzerlandV. KhachatryanEuropean Organization for Nuclear Research, Geneva, SwitzerlandA. M. SirunyanInstitut für Hochenergiephysik der OeAW , Wien , AustriaA. TumasyanEuropean Organization for Nuclear Research, Geneva, SwitzerlandW. AdamEuropean Organization for Nuclear Research, Geneva, SwitzerlandE. AguilóEuropean Organization for Nuclear Research, Geneva, SwitzerlandT. BergauerAustrian Academy of Sciences, Vienna, AustriaM. DragicevicEuropean Organization for Nuclear Research, Geneva, SwitzerlandJ. EröNational Centre for Particle and High Energy Physics , Minsk , BelarusC. FabjanNational Centre for Particle and High Energy Physics , Minsk , BelarusM. FriedlEuropean Organization for Nuclear Research, Geneva, SwitzerlandR. FrühwirthNational Centre for Particle and High Energy Physics , Minsk , BelarusV. M. GheteAustrian Academy of Sciences, Vienna, AustriaJ. HammerAustrian Academy of Sciences, Vienna, AustriaN. HörmannAustrian Academy of Sciences, Vienna, AustriaJ. HrubecEuropean Organization for Nuclear Research, Geneva, SwitzerlandM. JeitlerInstitut für Hochenergiephysik der OeAW , Wien , AustriaW. KiesenhoferNational Centre for Particle and High Energy Physics , Minsk , BelarusV. KnünzNational Centre for Particle and High Energy Physics , Minsk , BelarusM. KrammerEuropean Organization for Nuclear Research, Geneva, SwitzerlandI. KrätschmerNational Centre for Particle and High Energy Physics , Minsk , BelarusD. LikoNational Centre for Particle and High Energy Physics , Minsk , BelarusI. MikulecAustrian Academy of Sciences, Vienna, AustriaM. PernickaAustrian Academy of Sciences, Vienna, AustriaB. RahbaranEuropean Organization for Nuclear Research, Geneva, SwitzerlandC. RohringerEuropean Organization for Nuclear Research, Geneva, SwitzerlandH. RohringerNational Centre for Particle and High Energy Physics , Minsk , BelarusR. SchöfbeckEuropean Organization for Nuclear Research, Geneva, SwitzerlandJ. StraussNational Centre for Particle and High Energy Physics , Minsk , BelarusA. TaurokAustrian Academy of Sciences, Vienna, AustriaW. WaltenbergerAustrian Academy of Sciences, Vienna, AustriaG. WalzelEuropean Organization for Nuclear Research, Geneva, SwitzerlandE. WidlAustrian Academy of Sciences, Vienna, AustriaC.-E. WulzAustrian Academy of Sciences, Vienna, AustriaV. MossolovBelarusian State University, Minsk, BelarusN. ShumeikoBelarusian State University, Minsk, BelarusJ. Suarez GonzalezBelarusian State University, Minsk, BelarusM. BansalUniversity of Antwerp, Antwerp, BelgiumS. B. BeriUniversiteit Antwerpen , Antwerpen , BelgiumT. CornelisEuropean Organization for Nuclear Research, Geneva, SwitzerlandE. A. De WolfUniversity of Antwerp, Antwerp, BelgiumX. JanssenNational Centre for Particle and High Energy Physics , Minsk , BelarusS. LuyckxEuropean Organization for Nuclear Research, Geneva, SwitzerlandL. MucibelloEuropean Organization for Nuclear Research, Geneva, SwitzerlandS. OchesanuUniversity of Antwerp, Antwerp, BelgiumB. RolandNational Centre for Particle and High Energy Physics , Minsk , BelarusR. RougnyNational Centre for Particle and High Energy Physics , Minsk , BelarusM. SelvaggiEuropean Organization for Nuclear Research, Geneva, SwitzerlandZ. StaykovaVrije Universiteit Brussel , Brussel , BelgiumH. Van HaevermaetEuropean Organization for Nuclear Research, Geneva, SwitzerlandP. Van MechelenNational Centre for Particle and High Energy Physics , Minsk , BelarusN. Van RemortelNational Centre for Particle and High Energy Physics , Minsk , BelarusA. Van SpilbeeckEuropean Organization for Nuclear Research, Geneva, SwitzerlandF. BlekmanEuropean Organization for Nuclear Research, Geneva, SwitzerlandS. BlyweertEuropean Organization for Nuclear Research, Geneva, SwitzerlandJ. D’HondtEuropean Organization for Nuclear Research, Geneva, SwitzerlandR. Gonzalez SuarezEuropean Organization for Nuclear Research, Geneva, SwitzerlandA. KalogeropoulosNational Centre for Particle and High Energy Physics , Minsk , BelarusM. MaesEuropean Organization for Nuclear Research, Geneva, SwitzerlandA. OlbrechtsVrije Universiteit Brussel, Brussels, BelgiumW. Van DoninckVrije Universiteit Brussel, Brussels, BelgiumP. Van MuldersVrije Universiteit Brussel, Brussels, BelgiumG. P. Van OnsemVrije Universiteit Brussel , Brussel , BelgiumI. VillellaUniversité Libre de Bruxelles , Bruxelles , BelgiumB. ClerbauxUniversité Libre de Bruxelles, Brussels, BelgiumG. De LentdeckerEuropean Organization for Nuclear Research, Geneva, SwitzerlandV. DeroEuropean Organization for Nuclear Research, Geneva, SwitzerlandA. P. R. GayEuropean Organization for Nuclear Research, Geneva, SwitzerlandT. HreusUniversité Catholique de Louvain , Louvain-la-Neuve , BelgiumA. LéonardUniversité Libre de Bruxelles, Brussels, BelgiumP. MarageUniversité Libre de Bruxelles, Brussels, BelgiumA. MohammadiUniversité Catholique de Louvain , Louvain-la-Neuve , BelgiumT. ReisEuropean Organization for Nuclear Research, Geneva, SwitzerlandL. ThomasUniversité Catholique de Louvain , Louvain-la-Neuve , BelgiumG. Vander MarckenUniversité Libre de Bruxelles, Brussels, BelgiumC. Vander VeldeEuropean Organization for Nuclear Research, Geneva, SwitzerlandP. VanlaerEuropean Organization for Nuclear Research, Geneva, SwitzerlandJ. WangUniversité Libre de Bruxelles, Brussels, BelgiumV. AdlerEuropean Organization for Nuclear Research, Geneva, SwitzerlandK. BeernaertEuropean Organization for Nuclear Research, Geneva, SwitzerlandA. CimminoEuropean Organization for Nuclear Research, Geneva, SwitzerlandS. CostantiniUniversité Catholique de Louvain , Louvain-la-Neuve , BelgiumG. GarciaGhent University, Ghent, BelgiumM. GrünewaldEuropean Organization for Nuclear Research, Geneva, SwitzerlandB. KleinGhent University, Ghent, BelgiumJ. LellouchGhent University, Ghent, BelgiumA. MarinovUniversité Catholique de Louvain , Louvain-la-Neuve , BelgiumJ. MccartinUniversité Catholique de Louvain , Louvain-la-Neuve , BelgiumA. A. Ocampo RiosGhent University , Ghent , BelgiumD. RyckboschGhent University , Ghent , BelgiumN. StrobbeUniversité Catholique de Louvain , Louvain-la-Neuve , BelgiumF. ThyssenUniversité Catholique de Louvain , Louvain-la-Neuve , BelgiumM. TytgatEuropean Organization for Nuclear Research, Geneva, SwitzerlandP. VerwilligenEuropean Organization for Nuclear Research, Geneva, SwitzerlandS. WalshGhent University, Ghent, BelgiumE. YazganGhent University, Ghent, BelgiumN. ZaganidisGhent University, Ghent, BelgiumS. BaşeğmezEuropean Organization for Nuclear Research, Geneva, SwitzerlandG. BrunoUniversité de Mons , Mons , BelgiumR. CastelloUniversité Catholique de Louvain , Louvain-la-Neuve , Belgium
2012en
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Annotatsiya
A measurement is presented of the relative prompt production rate of χ c2 and χ c1 with 4.6 fb -1 of data collected by the CMS experiment at the LHC in pp collisions at √ s = 7 TeV.The two states are measured via their radiative decays χ c → J/ψ + γ , with the photon converting into an e + e -pair for J/ψ rapidity |y(J/ψ)| < 1.0 and photon transverse momentum p T (γ ) > 0.5 GeV/c.The measurement is given for six intervals of p T (J/ψ) between 7 and 25 GeV/c.The results are compared to theoretical predictions.
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