Multiplicity dependence of light-flavor hadron production in pp collisions at √s=7 TeV

被引:142
作者
Acharya, S. [154 ]
Acosta, F. T. [23 ]
Adamova, D. [105 ]
Adler, A. [86 ]
Adolfsson, J. [92 ]
Aggarwal, M. M. [110 ]
Rinella, G. Aglieri [46 ]
Agnello, M. [42 ]
Agrawal, N. [60 ]
Ahammed, Z. [154 ]
Ahn, S. U. [88 ]
Aiola, S. [159 ]
Akindinov, A. [76 ]
Al-Turany, M. [116 ,117 ]
Alam, S. N. [154 ]
Albuquerque, D. S. D. [134 ]
Aleksandrov, D. [99 ]
Alessandro, B. [70 ]
Alfanda, H. M. [7 ]
Alfaro Molina, R. [84 ]
Ali, Y. [18 ]
Alici, A. [12 ,13 ,34 ,35 ,65 ]
Alkin, A. [2 ]
Alme, J. [25 ]
Alt, T. [81 ]
Altenkamper, L. [25 ]
Altsybeev, I [124 ]
Anaam, M. N. [7 ]
Andrei, C. [59 ]
Andreou, D. [46 ]
Andrews, H. A. [121 ]
Andronic, A. [116 ,117 ,157 ]
Angeletti, M. [46 ]
Anguelov, V [114 ]
Anson, C. [19 ]
Anticic, T. [118 ]
Antinori, F. [68 ]
Antonioli, P. [65 ]
Anwar, R. [138 ]
Apadula, N. [91 ]
Aphecetche, L. [126 ]
Appelshaeuser, H. [81 ]
Arcelli, S. [34 ,35 ]
Arnaldi, R. [70 ]
Arsene, I. C. [24 ]
Arslandok, M. [114 ]
Augustinus, A. [46 ]
Averbeck, R. [116 ,117 ]
Azmi, M. D. [20 ]
Badal, A. [67 ]
机构
[1] Yerevan Phys Inst Fdn, AI Alikhanyan Natl Sci Lab, Yerevan, Armenia
[2] Natl Acad Sci Ukraine, Bogolyubov Inst Theoret Phys, Kiev, Ukraine
[3] Bose Inst, Dept Phys, Kolkata, India
[4] CAPSS, Kolkata, India
[5] Budker Inst Nucl Phys, Novosibirsk, Russia
[6] Calif Polytech State Univ San Luis Obispo, San Luis Obispo, CA 93407 USA
[7] Cent China Normal Univ, Wuhan, Hubei, Peoples R China
[8] IN2P3, Ctr Calcul, Lyon, France
[9] Ctr Aplicac Tecnol & Desarrollo Nucl CEADEN, Havana, Cuba
[10] Ctr Invest & Estudios Avanzados CINVESTAV, Mexico City, DF, Mexico
[11] Ctr Invest & Estudios Avanzados CINVESTAV, Merida, Mexico
[12] Museo Stor Fis, Ctr Fermi, Rome, Italy
[13] Ctr Ric Enrico Fermi, Rome, Italy
[14] Chicago State Univ, Chicago, IL USA
[15] China Inst Atom Energy, Beijing, Peoples R China
[16] Chonbuk Natl Univ, Jeonju, South Korea
[17] Comenius Univ, Fac Math Phys & Informat, Bratislava, Slovakia
[18] COMSATS Inst Informat Technol CIIT, Islamabad, Pakistan
[19] Creighton Univ, Omaha, NE 68178 USA
[20] Aligarh Muslim Univ, Dept Phys, Aligarh, Uttar Pradesh, India
[21] Pusan Natl Univ, Dept Phys, Pusan, South Korea
[22] Sejong Univ, Dept Phys, Seoul, South Korea
[23] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[24] Univ Oslo, Dept Phys, Oslo, Norway
[25] Univ Bergen, Dept Phys & Technol, Bergen, Norway
[26] Univ Roma La Sapienza, Dipartimento Fis, Rome, Italy
[27] Sezione Ist Nazl Fis Nucl, Rome, Italy
[28] Univ Cagliari, Dipartimento Fis, Cagliari, Italy
[29] Sezione Ist Nazl Fis Nucl, Cagliari, Italy
[30] Univ Trieste, Dipartimento Fis, Trieste, Italy
[31] Sezione Ist Nazl Fis Nucl, Trieste, Italy
[32] Univ Torino, Dipartimento Fis, Turin, Italy
[33] Sezione Ist Nazl Fis Nucl, Turin, Italy
[34] Univ Bologna, Dipartimento Fis & Astron, Bologna, Italy
[35] Sezione Ist Nazl Fis Nucl, Bologna, Italy
[36] Univ Catania, Dipartimento Fis & Astron, Catania, Italy
[37] Sezione Ist Nazl Fis Nucl, Catania, Italy
[38] Univ Padua, Dipartimento Fis & Astron, Padua, Italy
[39] Sezione Ist Nazl Fis Nucl, Padua, Italy
[40] Univ Salerno, Dipartimento Fis ER Caianiello, Salerno, Italy
[41] Grp Collegato INFN, Salerno, Italy
[42] Politecn Torino, Dipartimento DISAT, Turin, Italy
[43] Univ Piemonte Orientale, Dipartimento Sci & Innovaz Tecnol, Alessandria, Italy
[44] Dipartimento Interateneo Fis M Merlin, Bari, Italy
[45] Sezione Ist Nazl Fis Nucl, Bari, Italy
[46] CERN, European Org Nucl Res, Geneva, Switzerland
[47] Univ Split, Fac Elect Engn Mech Engn & Naval Architecture, Split, Croatia
[48] Western Norway Univ Appl Sci, Fac Engn & Sci, Bergen, Norway
[49] Czech Tech Univ, Fac Nucl Sci & Phys Engn, Prague, Czech Republic
[50] Safarik Univ, Fac Sci, Kosice, Slovakia
基金
新加坡国家研究基金会; 巴西圣保罗研究基金会; 美国国家科学基金会; 中国国家自然科学基金; 英国科学技术设施理事会; 日本学术振兴会; 瑞典研究理事会;
关键词
PB-PB COLLISIONS; RANGE ANGULAR-CORRELATIONS; TRANSVERSE-MOMENTUM; FREEZE-OUT; STATISTICAL HADRONIZATION; HEAVY; PARTICLE; RESONANCES; PHYSICS; PROTON;
D O I
10.1103/PhysRevC.99.024906
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
Comprehensive results on the production of unidentified charged particles, pi(+/-), K-+/-, K-s(0), K*(892)(0), p, (p) over bar, phi(1020), Lambda, (Lambda) over bar, Xi(-) , (Xi) over bar (+), Omega(-), and (Omega) over bar (+) hadrons in proton-proton (pp) collisions at root s = 7 TeV at midrapidity (vertical bar y vertical bar < 0.5) as a function of charged-particle multiplicity density are presented. In order to avoid autocorrelation biases, the actual transverse momentum (p(T)) spectra of the particles under study and the event activity are measured in different rapidity windows. In the highest multiplicity class, the charged-particle density reaches about 3.5 times the value measured in inelastic collisions. While the yield of protons normalized to pions remains approximately constant as a function of multiplicity, the corresponding ratios of strange hadrons to pions show a significant enhancement that increases with increasing strangeness content. Furthermore, all identified particleto-pion ratios are shown to depend solely on charged-particle multiplicity density, regardless of system type and collision energy. The evolution of the spectral shapes with multiplicity and hadron mass shows patterns that are similar to those observed in p-Pb and Pb-Pb collisions at Large Hadron Collider energies. The obtained p(T), distributions and yields are compared to expectations from QCD-based pp event generators as well as to predictions from thermal and hydrodynamic models. These comparisons indicate that traces of a collective, equilibrated system are already present in high-multiplicity pp collisions.
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