Observation of Long-Range Elliptic Azimuthal Anisotropies in √s=13 and 2.76 TeV pp Collisions with the ATLAS Detector

被引：262

作者：

Aad, G. ^{[121
,122
]}

Abbott, B. ^{[154
]}

Abdallah, J. ^{[213
]}

Abdinov, O. ^{[14
]}

Aben, R. ^{[147
,148
]}

Abolins, M. ^{[127
]}

AbouZeid, O. S. ^{[221
]}

Abramowicz, H. ^{[215
]}

Abreu, H. ^{[214
]}

Abreu, R. ^{[157
]}

Abulaiti, Y. ^{[206
,207
]}

Acharya, B. S. ^{[229
,230
,250
]}

Adamczyk, L. ^{[61
]}

Adams, D. L. ^{[38
]}

Adelman, J. ^{[149
]}

Adomeit, S. ^{[138
]}

Adye, T. ^{[181
]}

Affolder, A. A. ^{[107
]}

Agatonovic-Jovin, T. ^{[17
]}

Agricola, J. ^{[81
]}

Aguilar-Saavedra, J. A. ^{[170
,175
,176
]}

Ahlen, S. P. ^{[32
]}

Ahmadov, F. ^{[96
,251
]}

Aielli, G. ^{[184
,185
]}

Akerstedt, H. ^{[206
,207
]}

Akesson, T. P. ^{[117
]}

Akimov, A. V. ^{[134
]}

Alberghi, G. L. ^{[29
,30
]}

Albert, J. ^{[240
]}

Albrand, S. ^{[82
]}

Alconada Verzini, M. J. ^{[102
,103
]}

Aleksa, M. ^{[44
]}

Aleksandrov, I. N. ^{[96
]}

Alexa, C. ^{[39
]}

Alexander, G. ^{[215
]}

Alexopoulos, T. ^{[13
]}

Alhroob, M. ^{[154
]}

Alimonti, G. ^{[128
]}

Alio, L. ^{[121
,122
]}

Alison, J. ^{[45
]}

Alkire, S. P. ^{[57
]}

Allbrooke, B. M. M. ^{[211
]}

Allport, P. P. ^{[24
]}

Aloisio, A. ^{[1
,73
,143
,144
,151
]}

Alonso, A. ^{[58
]}

Alonso, F. ^{[102
,103
]}

Alpigiani, C. ^{[195
]}

Altheimer, A. ^{[57
]}

Alvarez Gonzalez, B. ^{[44
]}

Alvarez Piqueras, D. ^{[234
,235
,236
,237
,238
]}

机构：

[1] Univ Adelaide, Dept Phys, Adelaide, SA, Australia

[2] SUNY Albany, Dept Phys, Albany, NY 12222 USA

[3] Univ Alberta, Dept Phys, Edmonton, AB, Canada

[4] Ankara Univ, Dept Phys, TR-06100 Ankara, Turkey

[5] Istanbul Aydin Univ, Istanbul, Turkey

[6] TOBB Univ Econ & Technol, Div Phys, Ankara, Turkey

[7] CNRS, IN2P3, LAPP, Annecy Le Vieux, France

[8] Univ Savoie Mt Blanc, Annecy Le Vieux, France

[9] Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA

[10] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA

[11] Univ Texas Arlington, Dept Phys, POB 19059, Arlington, TX 76019 USA

[12] Univ Athens, Dept Phys, Athens, Greece

[13] Natl Tech Univ Athens, Dept Phys, Zografos, Greece

[14] Azerbaijan Acad Sci, Inst Phys, Baku 370143, Azerbaijan

[15] Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Barcelona, Spain

[16] Univ Autonoma Barcelona, Dept Fis, E-08193 Barcelona, Spain

[17] Univ Belgrade, Inst Phys, Belgrade, Serbia

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

[19] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA 94720 USA

[20] Univ Calif Berkeley, Berkeley, CA 94720 USA

[21] Humboldt Univ, Dept Phys, Invalidenstr 110, Berlin, Germany

[22] Univ Bern, Albert Einstein Ctr Fundamental Phys, Bern, Switzerland

[23] Univ Bern, High Energy Phys Lab, Bern, Switzerland

[24] Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England

[25] Bogazici Univ, Dept Phys, Istanbul, Turkey

[26] Gaziantep Univ, Dept Phys Engn, Gaziantep, Turkey

[27] Dogus Univ, Dept Phys, Istanbul, Turkey

[28] Dogus Univ, Dept Phys, Istanbul, Turkey

[29] Ist Nazl Fis Nucl, Sez Bologna, Bologna, Italy

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

[31] Univ Bonn, Inst Phys, Nussallee 12, Bonn, Germany

[32] Boston Univ, Dept Phys, 590 Commonwealth Ave, Boston, MA 02215 USA

[33] Brandeis Univ, Dept Phys, Waltham, MA 02254 USA

[34] Univ Fed Rio de Janeiro, COPPE, EE, IF, Rio De Janeiro, Brazil

[35] Fed Univ Juiz de Fora UFJF, Elect Circuits Dept, Juiz De Fora, Brazil

[36] Fed Univ Sao Joao del Rei UFSJ, Sao Joao Del Rei, Brazil

[37] Univ Sao Paulo, Inst Fis, CP 20516, BR-01498 Sao Paulo, Brazil

[38] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

[39] Natl Inst Phys & Nucl Engn, Bucharest, Romania

[40] Natl Inst Res & Dev Isotop & Mol Technol, Dept Phys, Cluj Napoca, Romania

[41] Univ Buenos Aires, Dept Fis, Buenos Aires, DF, Argentina

[42] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[43] Carleton Univ, Dept Phys, Ottawa, ON K1S 5B6, Canada

[44] CERN, Geneva, Switzerland

[45] Univ Chicago, Enrico Fermi Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA

[46] Pontificia Univ Catolica Chile, Dept Fis, Alameda 340, Santiago, Chile

[47] Univ Tecn Federico Santa Maria, Dept Fis, Valparaiso, Chile

[48] Chinese Acad Sci, Inst High Energy Phys, Beijing, Peoples R China

[49] Univ Sci & Technol China, Dept Modern Phys, Hefei, Anhui, Peoples R China

[50] Nanjing Univ, Dept Phys, Nanjing, Jiangsu, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 17期

基金：

巴西圣保罗研究基金会; 美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

PROTON-PROTON COLLISIONS; FLOW; ENERGY;

D O I：

10.1103/PhysRevLett.116.172301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

ATLAS has measured two-particle correlations as a function of the relative azimuthal angle, Delta phi, and pseudorapidity, Delta eta, in root s = 13 and 2.76 TeV pp collisions at the LHC using charged particles measured in the pseudorapidity interval vertical bar eta vertical bar < 2.5. The correlation functions evaluated in different intervals of measured charged-particle multiplicity show a multiplicity-dependent enhancement at Delta phi similar to 0 that extends over a wide range of Delta eta, which has been referred to as the "ridge." Per-trigger-particle yields, Y(Delta phi) are measured over 2 < vertical bar Delta eta vertical bar < 5. For both collision energies, the Y(Delta phi) distribution in all multiplicity intervals is found to be consistent with a linear combination of the per-trigger-particle yields measured in collisions with less than 2 phi reconstructed tracks, and a constant combinatoric contribution modulated by cos (2 Delta phi). The fitted Fourier coefficient, nu(2,2), exhibits factorization, suggesting that the ridge results from per-event cos (2 phi) modulation of the single-particle distribution with Fourier coefficients nu(2). The nu(2) values are presented as a function of multiplicity and transverse momentum. They are found to be approximately constant as a function of multiplicity and to have a p(T) dependence similar to that measured in p + Pb and Pb + Pb collisions. The nu(2) values in the 13 and 2.76 TeV data are consistent within uncertainties. These results suggest that the ridge in pp collisions arises from the same or similar underlying physics as observed in p + Pb collisions, and that the dynamics responsible for the ridge has no strong root s dependence.

引用

页数：20

共 45 条

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