Measurement of B_{s}^{0} meson production in pp and PbPb collisions at \sqrt{SNN}

AM Sirunyan, A Tumasyan,W Adam, F Ambrogi,E Asilar, T Bergauer,J Brandstetter,M Dragicevic,J Eroe,AE Del Valle, M Flechl,R Fruehwirth, VM Ghete, J Hrubec, M Jeitler, N Krammer, I Kraetschmer, D Liko, T Madlener, I Mikulec,N Rad, H Rohringer, J Schieck, R Schoefbeck,M Spanring,D Spitzbart,A Taurok,W Waltenberger,J Wittmann,C-E Wulz, M Zarucki, Chekhovsky, Mossolov,JS Gonzalez, EA De Wolf,D Di Croce, X Janssen, J Lauwers,M Pieters,H Van Haevermaet,P Van Mechelen,N Van Remortel,S Abu Zeid, F Blekman, J D'Hondt,J De Clercq, K Deroover, G Flouris, D Lontkovskyi, S Lowette, I Marchesini,S Moortgat, L Moreels, Q Python,K Skovpen,S Tavernier,W Van Doninck,P Van Mulders,I Van Parijs, D Beghin, B Bilin,H Brun,B Clerbaux,G De Lentdecker, H Delannoy, B Dorney,G Fasanella,L Favart,R Goldouzian, A Grebenyuk, AK Kalsi,T Lenzi, J Luetic,N Postiau,E Starling,L Thomas,C Vander Velde, P Vanlaer,D Vannerom,Q Wang,T Cornelis, D Dobur, A Fagot,M Gul, I Khvastunov, D Poyraz, C Roskas,D Trocino,M Tytgat,W Verbeke, B Vermassen,M Vit, N Zaganidis, H Bakhshiansohi, O Bondu,S Brochet, G Bruno,C Caputo,P David,C Delaere,M Delcourt, A Giammanco, G Krintiras, Lemaitre,A Magitteri,K Piotrzkowski,A Saggio,MV Marono, P Vischia,S Wertz, J Zobec,FL Alves,GA Alves, M Correa Martins,G Correia Silva, C Hensel,A Moraes,ME Pol,P Rebello Teles,E Belchior Batista Das Chagas,W Carvalho, J Chinellato, E Coelho, EM Da Costa, GG Da Silveira,D De Jesus Damiao,C De Oliveira Martins,S Fonseca De Souza, H Malbouisson,D Matos Figueiredo,M Melo De Almeida,C Mora Herrera, L Mundim, H Nogima, WL Prado Da Silva, LJ Sanchez Rosas,A Santoro,A Sznajder,M Thiel, EJ Tonelli Manganote,F Torres Da Silva De Araujo,A Vilela Pereira,S Ahuja,CA Bernardes,L Calligaris, TR Fernandez Perez Tomei, EM Gregores, PG Mercadante,SF Novaes,SS Padula, A Aleksandrov,R Hadjiiska, P Iaydjiev,A Marinov, M Misheva, M Rodozov,M Shopova,G Sultanov,A Dimitrov, L Litov, B Pavlov,P Petkov,W Fang,X Gao,L Yuan,M Ahmad,JG Bian,GM Chen,HS Chen,M Chen, Y Chen,CH Jiang, D Leggat,H Liao,Z Liu,F Romeo,SM Shaheen,A Spiezia,J Tao,Z Wang, E Yazgan,H Zhang,S Zhang,J Zhao, Y Ban,G Chen,A Levin,J Li,L Li, Q Li,Y Mao,SJ Qian,D Wang,Y Wang,C Avila,A Cabrera, CA Carrillo Montoya, LF Chaparro Sierra, C Florez, CF Gonzalez Hernandez, MA Segura Delgado,B Courbon,N Godinovic, D Lelas, I Puljak,T Sculac,Z Antunovic,M Kovac, Brigljevic, D Ferencek, K Kadija, B Mesic,A Starodumov,T Susa, MW Ather, A Attikis,M Kolosova,G Mavromanolakis, J Mousa, C Nicolaou, F Ptochos, PA Razis,H Rykaczewski, M Finger,E Ayala,E Carrera Jarrin,H Abdalla, AA Abdelalim, S Elgammal,S Bhowmik, AC Antunes De Oliveira,RK Dewanjee,K Ehataht, M Kadastik,M Raidal, C Veelken, P Eerola,H Kirschenmann, J Pekkanen, M Voutilainen, J Havukainen, JK Heikkila,T Jarvinen, Karimaki,R Kinnunen, T Lampen, K Lassila-Perini,S Laurila, S Lehti,T Linden, P Luukka, T Maenpaa,H Siikonen,E Tuominen, J Tuominiemi, T Tuuva, M Besancon,F Couderc,M Dejardin, D Denegri,JL Faure, F Ferri, S Ganjour, A Givernaud, P Gras,GH de Monchenault, P Jarry,C Leloup,E Locci, J Malcles,G Negro, J Rander, A Rosowsky,MO Sahin,M Titov,A Abdulsalam,C Amendola, I Antropov, F Beaudette, P Busson, C Charlot,RG de Cassagnac, I Kucher,A Lobanov,JM Blanco, CM Perez, M Nguyen, C Ochando, G Ortona, P Paganini, P Pigard, J Rembser, R Salerno, JB Sauvan, Y Sirois,Ags Leiton,A Zabi,A Zghiche,J-L Agram, J Andrea, D Bloch,J-M Brom, EC Chabert, Cherepanov, C Collard, E Conte,J-C Fontaine, D Gele, U Goerlach,M Jansova,A-C Le Bihan,N Tonon,P Van Hove,S Gadrat,S Beauceron,C Bernet, G Boudoul, N Chanon, R Chierici,D Contardo, P Depasse,H El Mamouni,J Fay,L Finco, S Gascon,M Gouzevitch, G Grenier, B Ille,F Lagarde,IB Laktineh,H Lattaud,M Lethuillier, L Mirabito, S Perries,A Popov, Sordini,G Touquet,M Vander Donckt, S Viret, T Toriashvili,Z Tsamalaidze,C Autermann,L Feld,MK Kiesel,K Klein,M Lipinski,M Preuten, MP Rauch, C Schomakers,J Schulz,M Teroerde, B Wittmer,A Albert, D Duchardt, M Erdmann,S Erdweg,T Esch,R Fischer,S Ghosh, A Gueth, T Hebbeker, C Heidemann,K Hoepfner,H Keller,L Mastrolorenzo, M Merschmeyer,A Meyer,P Millet,S Mukherjee,T Pook, M Radziej, H Reithler,M Rieger,A Schmidt,D Teyssier,S Thueer,G Fluegge,O Hlushchenko, T Kress,T Mueller, A Nehrkorn, A Nowack,C Pistone, O Pooth,D Roy,H Sert, A Stahl,MA Martin,T Arndt,C Asawatangtrakuldee, I Babounikau, K Beernaert,O Behnke, U Behrens, AB Martinez, D Bertsche,AA Bin Anuar, K Borras, Botta,A Campbell,P Connor, C Contreras-Campana, Danilov,A De Wit,MM Defranchis,CD Pardos,DD Damiani,G Eckerlin,T Eichhorn,A Elwood,E Eren,E Gallo, A Geiser, Jmg Luyando, A Grohsjean,M Guthoff,M Haranko,A Harb, J Hauk,H Jung, M Kasemann, J Keaveney, C Kleinwort,J Knolle,D Kruecker,W Lange, A Lelek,T Lenz,J Leonard,K Lipka, W Lohmann,R Mankel,I-A Melzer-Pellmann,AB Meyer,M Meyer, M Missiroli,G Mittag, J Mnich, Myronenko,SK Pflitsch, D Pitzl, A Raspereza,M Savitskyi,P Saxena, P Schuetze,C Schwanenberger,R Shevchenko,A Singh, H Tholen,O Turkot, A Vagnerini, GP Van Onsem,R Walsh,Y Wen,K Wichmann,C Wissing, O Zenaiev,R Aggleton, S Bein, L Benato, A Benecke, Blobel,T Dreyer,A Ebrahimi, E Garutti,D Gonzalez, P Gunnellini,J Haller,A Hinzmann, A Karavdina,G Kasieczka, R Klanner,R Kogler, N Kovalchuk,S Kurz, Kutzner,J Lange,D Marconi,J Multhaup, M Niedziela, Cen Niemeyer, D Nowatschin, A Perieanu,A Reimers, O Rieger, C Scharf, P Schleper,S Schumann, J Schwandt,J Sonneveld, H Stadie,G Steinbrueck, FM Stober,M Stoever, A Vanhoefer, B Vormwald,I Zoi,M Akbiyik,C Barth,M Baselga

user-5dd52aee530c701191bf1b99（2019）

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摘要

The production cross sections of B_{s}^{0} mesons and charge conjugates are measured in proton-proton (pp) and PbPb collisions via the exclusive decay channel B_{s}^{0}→J/ψϕ→μ^{+}μ^{−}K^{+}K^{−} at a center-of-mass energy of 5.02 TeV per nucleon pair and within the rapidity range |y|<2.4 using the CMS detector at the LHC. The pp measurement is performed as a function of transverse momentum (p_{T}) of the B_{s}^{0} mesons in the range of 7 to 50 GeV/c and is compared to the predictions of perturbative QCD calculations. The B_{s}^{0} production yield in PbPb collisions is measured in two p_{T} intervals, 7 to 15 and 15 to 50 GeV/c, and compared to the yield in pp collisions in the same kinematic region. The nuclear modification factor (R_{AA}) is found to be 1.5±0.6(stat)±0.5(syst) for 7–15 GeV/c, and 0.87±0.30(stat)±0.17(syst) for 15–50 GeV/c, respectively. Within current uncertainties, the B_{s}^{0} results are consistent with models of strangeness enhancement, and suppression by parton energy loss, as observed for the B+ mesons.

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关键词

Perturbative QCD,B meson,Meson,Strangeness,Rapidity,Nucleon,Parton,Quark–gluon plasma,Particle physics,Physics

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