Underlying event properties in pp collisions at √s=13 TeV

被引：0

作者：

Acharya, S. ^{[157
]}

Acosta, F. T. ^{[24
]}

Adam, J. ^{[52
]}

Adamova, D. ^{[108
]}

Adler, A. ^{[89
]}

Adolfsson, J. ^{[95
]}

Aggarwal, M. M. ^{[113
]}

Rinella, G. Aglieri ^{[49
]}

Agnello, M. ^{[43
,44
]}

Agrawal, N. ^{[63
]}

Ahammed, Z. ^{[157
]}

Ahn, S. U. ^{[91
]}

Aiola, S. ^{[162
]}

Akindinov, A. ^{[79
]}

Al-Turany, M. ^{[119
,120
]}

Alam, S. N. ^{[157
]}

Albuquerque, D. S. D. ^{[137
]}

Aleksandrov, D. ^{[102
]}

Alessandro, B. ^{[73
]}

Alfanda, H. M. ^{[7
]}

Alfaro Molina, R. ^{[87
]}

Ali, Y. ^{[19
]}

Alici, A. ^{[13
,14
,35
,36
,68
]}

Alkin, A. ^{[2
]}

Alme, J. ^{[26
]}

Alt, T. ^{[84
]}

Altenkamper, L. ^{[26
]}

Altsybeev, I. ^{[127
]}

Anaam, M. N. ^{[7
]}

Andrei, C. ^{[62
]}

Andreou, D. ^{[49
]}

Andrews, H. A. ^{[124
]}

Andronic, A. ^{[119
,120
,160
]}

Angeletti, M. ^{[49
]}

Anguelov, V. ^{[117
]}

Anson, C. ^{[20
]}

Anticic, T. ^{[121
]}

Antinori, F. ^{[71
]}

Antonioli, P. ^{[68
]}

Anwar, R. ^{[141
]}

Apadula, N. ^{[94
]}

Aphecetche, L. ^{[129
]}

Appelshaeuser, H. ^{[84
]}

Arcelli, S. ^{[35
,36
]}

Arnaldi, R. ^{[73
]}

Arratia, M. ^{[94
]}

Arsene, I. C. ^{[25
]}

Arslandok, M. ^{[117
]}

Augustinus, A. ^{[49
]}

Averbeck, R. ^{[119
,120
]}

机构：

[1] Yerevan Phys Inst, 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] Bose Inst, Ctr Astroparticle Phys & Space Sci, Kolkata, India

[5] Budker Inst Nucl Phys, Novosibirsk, Russia

[6] Calif Polytechn State Univ, San Luis Obispo, CA USA

[7] Cent China Normal Univ, Wuhan, Hubei, Peoples R China

[8] Ctr Calcul IN2P3, Villeurbanne, France

[9] Ctr Calcul IN2P3, Lyon, France

[10] Ctr Aplicaciones Tecnolog & Desarrollo Nucl CEADE, Havana, Cuba

[11] Ctr Investigac & Estudios Avanzados CINVESTAV, Mexico City, DF, Mexico

[12] Ctr Investigac & Estudios Avanzados CINVESTAV, Merida, Venezuela

[13] Ctr Fermi Museo Storico Fis, Rome, Italy

[14] Ctr Studi & Ric Enrico Fermi, Rome, Italy

[15] Chicago State Univ, Chicago, IL USA

[16] China Inst Atom Energy, Beijing, Peoples R China

[17] Chonbuk Natl Univ, Jeonju, South Korea

[18] Comenius Univ, Fac Math, Phys & Informat, Bratislava, Slovakia

[19] COMSATS Inst Informat Technol CIIT, Islamabad, Pakistan

[20] Creighton Univ, Omaha, NE 68178 USA

[21] Aligarh Muslim Univ, Dept Phys, Aligarh, Uttar Pradesh, India

[22] Pusan Natl Univ, Dept Phys, Pusan, South Korea

[23] Sejong Univ, Dept Phys, Seoul, South Korea

[24] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[25] Univ Oslo, Dept Phys, Oslo, Norway

[26] Univ Bergen, Dept Phys & Technol, Bergen, Norway

[27] Univ Roma La Sapienza, Dipartimento Fis, Rome, Italy

[28] Sezione Ist Nazl Fis Nucl, Rome, Italy

[29] Univ Cagliari, Dipartimento Fis, Cagliari, Italy

[30] Sezione Ist Nazl Fis Nucl, Cagliari, Italy

[31] Univ Trieste, Dipartimento Fis, Trieste, Italy

[32] Sezione Ist Nazl Fis Nucl, Trieste, Italy

[33] Univ Turin, Dipartimento Fis, Turin, Italy

[34] Sezione Ist Nazl Fis Nucl, Turin, Italy

[35] Univ Bologna, Dipartimento Fis & Astron, Bologna, Italy

[36] Sezione Ist Nazl Fis Nucl, Bologna, Italy

[37] Univ Catania, Dipartimento Fis & Astron, Catania, Italy

[38] Sezione Ist Nazl Fis Nucl, Catania, Italy

[39] Univ Padua, Dipartimento Fis & Astron, Padua, Italy

[40] Sezione Ist Nazl Fis Nucl, Padua, Italy

[41] ER Caianiello Univ Salerno, Dipartimento Fis, Salerno, Italy

[42] Grp Collegato INFN, Salerno, Italy

[43] Politecn Torino, Dipartimento DISAT, Turin, Italy

[44] Sezione Ist Nazl Fis Nucl, Turin, Italy

[45] Univ Piemonte Orientale, Dipartimento Sci & Innovaz Tecnol, Alessandria, Italy

[46] INFN, Sez Torino, Alessandria, Italy

[47] Dipartimento Interateneo Fis M Merlin, Bari, Italy

[48] Sezione Ist Nazl Fis Nucl, Bari, Italy

[49] European Org Nucl Res CERN, Geneva, Switzerland

[50] Univ Split, Fac Elect Engn Mech Engn & Naval Architecture, Split, Croatia

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2020年 / 04期

基金：

俄罗斯科学基金会; 新加坡国家研究基金会; 瑞典研究理事会; 俄罗斯基础研究基金会; 奥地利科学基金会; 中国国家自然科学基金; 美国能源部; 日本学术振兴会; 美国国家科学基金会; 英国科学技术设施理事会; 巴西圣保罗研究基金会;

关键词：

Hadron-Hadron scattering (experiments); PROTON-PROTON COLLISIONS; PB-PB COLLISIONS; TRANSVERSE-MOMENTUM; CHARGED-PARTICLES; DISTRIBUTIONS;

D O I：

10.1007/JHEP04(2020)192

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：

This article reports measurements characterizing the Underlying Event (UE) associated with hard scatterings at midrapidity (|eta| < 0.8) in pp collisions at <mml:msqrt>s = 13 TeV. The hard scatterings are identified by the leading particle, the charged particle with the highest transverse momentum (pTleading) in the event. Charged-particle number-densities and summed transverse-momentum densities are measured in different azimuthal regions defined with respect to the leading particle direction: Toward, Transverse, and Away. The Toward and Away regions contain the fragmentation products of the hard scatterings in addition to the UE contribution, whereas particles in the Transverse region are expected to originate predominantly from the UE. The study is performed as a function of pTleading with three different p(T) thresholds for the associated particles, pTtrack > 0.15, 0.5, and 1.0 GeV/c. The charged-particle density in the Transverse region rises steeply for low values of pTleading and reaches a plateau. The results confirm the trend that the charged-particle density in the Transverse region shows a stronger increase with s than the inclusive charged-particle density at midrapidity. The UE activity is increased by approximately 20% when going from 7 TeV to 13 TeV pp collisions. The plateau in the Transverse region (5 <pTleading< 40 GeV/c) is further characterized by the probability distribution of its charged-particle multiplicity normalized to its average value (relative transverse activity, R-T) and the mean transverse momentum as a function of R-T. Experimental results are compared to model calculations using PYTHIA 8 and EPOS LHC. The overall agreement between models and data is within 30%. These measurements provide new insights on the interplay between hard scatterings and the associated UE in pp collisions.

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