Measurement of prompt J/ψ and beauty hadron production cross sections at mid-rapidity in pp collisions at √s=7 TeV

被引:0
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作者
Abelev, Betty [1 ]
Adam, Jaroslav [47 ]
Adamova, Dagmar [88 ]
Adare, Andrew Marshall [126 ]
Aggarwal, Madan [92 ]
Rinella, Gianluca Aglieri [43 ]
Agocs, Andras Cabor [76 ]
Agostinelli, Andrea [28 ,29 ]
Salazar, Saul Aguilar [72 ]
Ahammed, Zubayer [122 ]
Ahmad, Arshad [17 ]
Ahmad, Nazeer [17 ]
Ahn, Sul-Ah [78 ]
Ahn, Sang Un [50 ,79 ]
Akindinov, Alexander [62 ]
Aleksandrov, Dmitry [104 ]
Alessandro, Bruno [37 ]
Alfaro Molina, Jose Ruben [72 ]
Alici, Andrea [11 ,12 ,29 ]
Alkin, Anton [3 ]
Almaraz Avina, Erick Jonathan [72 ]
Alme, Johan [45 ]
Alt, Torsten [49 ]
Altini, Valerio [40 ,41 ]
Altinpinar, Sedat [18 ]
Altsybeev, Igor [123 ]
Andrei, Cristian [85 ]
Andronic, Anton [100 ,101 ]
Anguelov, Venelin [97 ]
Anielski, Jonas [70 ]
Anson, Christopher Daniel [19 ]
Anticic, Tome [102 ]
Antinori, Federico [25 ]
Antonioli, Pietro [29 ]
Aphecetche, Laurent Bernard [94 ]
Appelshauser, Harald [68 ]
Arbor, Nicolas [80 ]
Arcelli, Silvia [28 ,29 ]
Arend, Andreas [68 ]
Armesto, Nestor [15 ,16 ]
Arnaldi, Roberta [37 ]
Aronsson, Tomas Robert [126 ]
Arsene, Ionut Cristian [100 ,101 ]
Arslandok, Mesut [68 ]
Asryan, Andzhey [123 ]
Augustinus, Andre [43 ]
Averbeck, Ralf Peter [100 ,101 ]
Awes, Terry [89 ]
Aysto, Juha Heikki [51 ,52 ]
Azmi, Mohd Danish [17 ]
机构
[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
[2] Benemerita Univ Autonoma Puebla, Puebla, Mexico
[3] Bogolyubov Inst Theoret Phys, Kiev, Ukraine
[4] Budker Inst Nucl Phys, Novosibirsk 630090, Russia
[5] Calif Polytech State Univ San Luis Obispo, San Luis Obispo, CA 93407 USA
[6] Ctr Calcul lIN2P3, Villeurbanne, France
[7] Ctr Aplicac Tecnol & Desarrollo Nucl CEADEN, Havana, Cuba
[8] Ctr Invest Energet Medioambientales & Tecnol CIEM, Madrid, Spain
[9] Ctr Invest & Estudios Avanzados CINVESTAV, Mexico City, DF, Mexico
[10] Ctr Invest & Estudios Avanzados CINVESTAV, Merida, Mexico
[11] Ctr Studi & Ric, Ctr Fermi, Rome, Italy
[12] Museo Stor Fis Enrico Fermi, Rome, Italy
[13] Chicago State Univ, Chicago, IL USA
[14] IRFU, Commissariat Energie Atom, Saclay, France
[15] Univ Santiago de Compostela, Dept Fis Particulas, Santiago De Compostela, Spain
[16] Univ Santiago de Compostela, IGFAE, Santiago De Compostela, Spain
[17] Aligarh Muslim Univ, Dept Phys, Aligarh 202002, Uttar Pradesh, India
[18] Univ Bergen, Dept Phys & Technol, Bergen, Norway
[19] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA
[20] Sejong Univ, Dept Phys, Seoul, South Korea
[21] Univ Oslo, Dept Phys, Oslo, Norway
[22] Univ Cagliari, Dipartimento Fis, Cagliari, Italy
[23] Sezione Ist Nazl Fis Nucl, Cagliari, Italy
[24] Univ Padua, Dipartimento Fis, Padua, Italy
[25] Sezione Ist Nazl Fis Nucl, Padua, Italy
[26] Univ Trieste, Dipartimento Fis, Trieste, Italy
[27] Sezione Ist Nazl Fis Nucl, Trieste, Italy
[28] Univ Bologna, Dipartimento Fis, Bologna, Italy
[29] Sezione Ist Nazl Fis Nucl, Bologna, Italy
[30] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
[31] Sezione Ist Nazl Fis Nucl, Rome, Italy
[32] Univ Catania, Dipartimento Fis & Astron, Catania, Italy
[33] Sezione Ist Nazl Fis Nucl, Catania, Italy
[34] Univ Salerno, Dipartimento Fis ER Caianiello, I-84100 Salerno, Italy
[35] Grp Collegato INFN, Salerno, Italy
[36] Univ Turin, Dipartimento Fis Sperimentale, Turin, Italy
[37] Sezione Ist Nazl Fis Nucl, Turin, Italy
[38] Univ Piemonte Orientale, Dipartimento Sci & Innovaz Tecnol, Alessandria, Italy
[39] Grp Collegato INFN, Alessandria, Italy
[40] Dipartimento Interateneo Fis M Merlin, Bari, Italy
[41] Sezione Ist Nazl Fis Nucl, Bari, Italy
[42] Lund Univ, Div Expt High Energy Phys, Lund, Sweden
[43] European Org Nucl Res CERN, Geneva, Switzerland
[44] Fachhsch Koln, Cologne, Germany
[45] Bergen Univ Coll, Fac Engn, Bergen, Norway
[46] Comenius Univ, Fac Math Phys & Informat, Bratislava, Slovakia
[47] Czech Tech Univ, Fac Nucl Sci & Phys Engn, CR-16635 Prague, Czech Republic
[48] Safarik Univ, Fac Sci, Kosice, Slovakia
[49] Goethe Univ Frankfurt, Frankfurt Inst Adv Studies, Frankfurt, Germany
[50] Gangneung Wonju Natl Univ, Kangnung, South Korea
来源
基金
巴西圣保罗研究基金会; 欧洲研究理事会; 美国国家科学基金会; 英国科学技术设施理事会; 新加坡国家研究基金会; 美国能源部; 芬兰科学院; 中国国家自然科学基金; 瑞典研究理事会;
关键词
Hadron-Hadron Scattering; QED RADIATIVE-CORRECTIONS; UNIVERSAL MONTE-CARLO; P(P)OVER-BAR COLLISIONS; QUARK PRODUCTION; D-SIGMA/DP(T); DECAYS; PHOTOS; MESON;
D O I
10.1007/JHEP11(2012)065
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
The ALICE experiment at the LHC has studied J/psi production at mid-rapidity in pp collisions at root s = 7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity L-int = 5.6 nb(-1). The fraction of J/psi from the decay of long-lived beauty hadrons was determined for J/psi candidates with transverse momentum p(t) > 1,3 GeV/c and rapidity vertical bar y vertical bar < 0.9. The cross section for prompt J/psi mesons, i.e. directly produced J/psi and prompt decays of heavier charmonium states such as the psi(2S) and chi(c) resonances, is sigma(prompt J/psi) (p(t) > 1.3 GeV/c, vertical bar y vertical bar < 0.9) = 8.3 +/- 0.8(stat.) +/- 1.1 (syst.)(-1.4)(+1.5) (syst. pol.) mu b. The cross section for the production of b-hadrons decaying to J/psi with p(t) > 1.3 GeV/c and vertical bar y vertical bar < 0.9 is a sigma(J/psi <- hB) (p(t) > 1.3 GeV/c, vertical bar y vertical bar < 0.9) = 1.46 +/- 0.38 (stat.)(-0.32)(+0.26) (syst.) mu b. The results are compared to QCD model predictions. The shape of the p(t) and y distributions of b-quarks predicted by perturbative QCD model calculations are used to extrapolate the measured cross section to derive the b (b) over bar pair total cross section and d sigma/dy at mid-rapidity.
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页数:31
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