Dielectron production in proton-proton collisions at √s=7 TeV

被引：0

作者：

Acharya, S. ^{[157
]}

Collaboration, A. L. I. C. E.

Acosta, F. T. ^{[29
]}

Adamova, D. ^{[111
]}

Adolfsson, J. ^{[98
]}

Aggarwal, M. M. ^{[115
]}

Rinella, G. Aglieri ^{[53
]}

Agnello, M. ^{[39
,48
]}

Agrawal, N. ^{[66
]}

Ahammed, Z. ^{[157
]}

Ahn, S. U. ^{[94
]}

Aiola, S. ^{[162
]}

Akindinov, A. ^{[82
]}

Al-Turany, M. ^{[121
,122
]}

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

Albuquerque, D. S. D. ^{[138
]}

Aleksandrov, D. ^{[105
]}

Alessandro, B. ^{[76
]}

Alfaro Molina, R. ^{[90
]}

Ali, Y. ^{[23
]}

Alici, A. ^{[17
,18
,40
,41
,71
]}

Alkin, A. ^{[7
]}

Alme, J. ^{[31
]}

Alt, T. ^{[87
]}

Altenkamper, L. ^{[31
]}

Altsybeev, I. ^{[156
]}

Anaam, M. N. ^{[12
]}

Andrei, C. ^{[65
]}

Andreou, D. ^{[53
]}

Andrews, H. A. ^{[126
]}

Andronic, A. ^{[121
,122
,160
]}

Angeletti, M. ^{[53
]}

Anguelov, V. ^{[119
]}

Anson, C. ^{[24
]}

Anticic, T. ^{[123
]}

Antinori, F. ^{[74
]}

Antonioli, P. ^{[71
]}

Anwar, R. ^{[142
]}

Apadula, N. ^{[97
]}

Aphecetche, L. ^{[130
]}

Appelshaeuser, H. ^{[87
]}

Arcelli, S. ^{[40
,41
]}

Arnaldi, R. ^{[76
]}

Arnold, O. W. ^{[120
,133
]}

Arsene, I. C. ^{[30
]}

Arslandok, M. ^{[119
]}

Audurier, B. ^{[130
]}

Augustinus, A. ^{[53
]}

Averbeck, R. ^{[121
,122
]}

Azmi, M. D. ^{[25
]}

机构：

[1] Politecn Torino, Dipartimento DET, Turin, Italy

[2] Moscow MV Lomonosov State Univ, DV Skobeltsyn Inst Nucl, Phys, Moscow, Russia

[3] Aligarh Muslim Univ, Dept Appl Phys, Aligarh, Uttar Pradesh, India

[4] Univ Wroclaw, Inst Theoret Phys, Wroclaw, Poland

[5] Yerevan Phys Inst Fdn, AI Alikhanyan Natl Sci Lab, Yerevan, Armenia

[6] Benemerita Univ Autonoma Puebla, Puebla, Mexico

[7] Natl Acad Sci Ukraine, Bogolyubov Inst Theoret Phys, Kiev, Ukraine

[8] Bose Inst, Dept Phys, Kolkata, India

[9] CAPSS, Kolkata, India

[10] Budker Inst Nucl Phys, Novosibirsk, Russia

[11] Calif Polytech State Univ San Luis Obispo, San Luis Obispo, CA 93407 USA

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

[13] Ctr Calcul IN2P3, Lyon, France

[14] CEADEN, Ctr Aplicac Tecnol & Desarrollo Nucl, Havana, Cuba

[15] CINVESTAV, Ctr Invest & Estudios Avanzados, Mexico City, DF, Mexico

[16] CINVESTAV, Ctr Invest & Estudios Avanzados, Merida, Mexico

[17] Museo Stor Fis, Ctr Fermi, Rome, Italy

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

[19] Chicago State Univ, Chicago, IL USA

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

[21] Chonbuk Natl Univ, Jeonju, South Korea

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

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

[24] Creighton Univ, Omaha, NE 68178 USA

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

[26] Ohio State Univ, Dept Phys, 174 W 18th Ave, Columbus, OH 43210 USA

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[47] INFN, Grp Collegato, Salerno, Italy

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

[49] Univ Piemonte Orientale, Dipartimento Sci & Innovazi Tecnol, Alessandria, Italy

[50] INFN Sez Torino, Alessandria, Italy

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2018年 / 09期

基金：

中国国家自然科学基金; 新加坡国家研究基金会; 巴西圣保罗研究基金会; 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; 美国能源部; 瑞典研究理事会;

关键词：

Heavy Ion Experiments; PHYSICS PERFORMANCE REPORT; TRANSITION FORM-FACTORS; PB-AU COLLISIONS; ENERGY-LOSS; TRANSVERSE-MOMENTUM; PHOTON PRODUCTION; MESON PRODUCTION; PAIR PRODUCTION; PP COLLISIONS; CERN-SPS;

D O I：

10.1007/JHEP09(2018)064

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 first measurement of e(+)e(-) pair production at mid-rapidity (vertical bar eta vertical bar(e) < 0.8) in pp collisions at root s = 7TeV with ALICE at the LHC is presented. The dielectron production is studied as a function of the invariant mass (m(ee )< 3.3 GeV/c(2)), the pair transverse momentum (p(T,ee) < 8 GeV/c), and the pair transverse impact parameter (DCA(ee)), i.e., the average distance of closest approach of the reconstructed electron and positron tracks to the collision vertex, normalised to its resolution. The results are compared with the expectations from a cocktail of known hadronic sources and are well described when PYTHIA is used to generate the heavy-flavour contributions. In the low-mass region (0.14 < m(ee) < 1.1 GeV/c(2)), prompt and non-prompt e(+)e(-) sources can be separated via the DCA(ee). In the intermediate-mass region (1.1 < m(ee) < 2.7 GeV/c(2)), a double-differential fit to the data in m(ee) and p(T,ee) and a fit of the DCA(ee) distribution allow the total cc and bb cross sections to be extracted. Two different event generators, PYTHIA and POWHEG, can reproduce the shape of the two-dimensional m(ee) and p(T,ee) spectra, as well as the shape , of the DCA(ee) distribution, reasonably well. However, differences in the c (c) over bar and b (b) over bar cross sections are observed when using the generators to extrapolate to full phase space. Finally, the ratio of inclusive to decay photons is studied via the measurement of virtual direct photons in the transverse-momentum range 1 < p(T) < 8 GeV/c. This is found to be unity within the statistical and systematic uncertainties and consistent with expectations from next-to-leading order perturbative quantum chromodynamic calculations.

引用

页数：47

共 112 条

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