Pair invariant mass to isolate background in the search for the chiral magnetic effect in Au plus Au collisions at √sNN=200 GeV

被引：12

作者：

Abdallah, M. S. ^{[5
]}

Adam, J. ^{[6
]}

Adamczyk, L. ^{[2
]}

Adams, J. R. ^{[39
]}

Adkins, J. K. ^{[30
]}

Agakishiev, G. ^{[28
]}

Aggarwal, I. ^{[41
]}

Aggarwal, M. M. ^{[41
]}

Ahammed, Z. ^{[60
]}

Alekseev, I. ^{[3
,35
]}

Anderson, D. M. ^{[55
]}

Aparin, A. ^{[28
]}

Aschenauer, E. C. ^{[6
]}

Ashraf, M. U. ^{[11
]}

Atetalla, F. G. ^{[29
]}

Attri, A. ^{[41
]}

Averichev, G. S. ^{[28
]}

Bairathi, V. ^{[53
]}

Baker, W. ^{[10
]}

Cap, J. G. Ball ^{[20
]}

Barish, K. ^{[10
]}

Behera, A. ^{[52
]}

Bellwied, R. ^{[20
]}

Bhagat, P. ^{[27
]}

Bhasin, A. ^{[27
]}

Bielcik, J. ^{[14
]}

Bielcikova, J. ^{[38
]}

Bordyuzhin, I. G. ^{[3
]}

Brandenburg, J. D. ^{[6
]}

Brandin, A. V. ^{[35
]}

Bunzarov, I. ^{[28
]}

Butterworth, J. ^{[45
]}

Cai, X. Z. ^{[50
]}

Caines, H. ^{[63
]}

Sanchez, M. Calderon de la Barca ^{[8
]}

Cebra, D. ^{[8
]}

Chakaberia, I. ^{[6
,31
]}

Chaloupka, P. ^{[14
]}

Chan, B. K. ^{[9
]}

Chang, F-H. ^{[37
]}

Chang, Z. ^{[6
]}

Chankova-Bunzarova, N. ^{[28
]}

Chatterjee, A. ^{[11
]}

Chattopadhyay, S. ^{[60
]}

Chen, D. ^{[10
]}

Chen, J. ^{[49
]}

Chen, J. H. ^{[18
]}

Chen, X. ^{[48
]}

Chen, Z. ^{[49
]}

Cheng, J. ^{[57
]}

机构：

[1] Abilene Christian Univ, Abilene, TX 79699 USA

[2] AGH Univ Sci & Technol, FPACS, PL-30059 Krakow, Poland

[3] Kurchatov Inst, Alikhanov Inst Theoret & Expt Phys NRC, Moscow 117218, Russia

[4] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA

[5] Amer Univ Cairo, New Cairo 11835, Egypt

[6] Brookhaven Natl Lab, Upton, NY 11973 USA

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

[8] Univ Calif Davis, Davis, CA 95616 USA

[9] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[10] Univ Calif Riverside, Riverside, CA 92521 USA

[11] Cent China Normal Univ, Wuhan 430079, Hubei, Peoples R China

[12] Univ Illinois, Chicago, IL 60607 USA

[13] Creighton Univ, Omaha, NE 68178 USA

[14] Czech Tech Univ, FNSPE, Prague 11519, Czech Republic

[15] Tech Univ Darmstadt, D-64289 Darmstadt, Germany

[16] Eotvos Lorand Univ, H-1117 Budapest, Hungary

[17] Frankfurt Inst Adv Studies FIAS, D-60438 Frankfurt, Germany

[18] Fudan Univ, Shanghai 200433, Peoples R China

[19] Heidelberg Univ, D-69120 Heidelberg, Germany

[20] Univ Houston, Houston, TX 77204 USA

[21] Huzhou Univ, Huzhou 313000, Zhejiang, Peoples R China

[22] Indian Inst Sci Educ & Res IISER, Berhampur 760010, Odisha, India

[23] Indian Inst Sci Educ & Res IISER Tirupati, Tirupati 517507, Andhra Pradesh, India

[24] Indian Inst Technol, Patna 801106, Bihar, India

[25] Indiana Univ, Bloomington, IN 47408 USA

[26] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China

[27] Univ Jammu, Jammu 180001, India

[28] Joint Inst Nucl Res, Dubna 141980, Russia

[29] Kent State Univ, Kent, OH 44242 USA

[30] Univ Kentucky, Lexington, KY 40506 USA

[31] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[32] Lehigh Univ, Bethlehem, PA 18015 USA

[33] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[34] Michigan State Univ, E Lansing, MI 48824 USA

[35] Natl Res Nucl Univ MEPhI, Moscow 115409, Russia

[36] HBNI, Natl Inst Sci Educ & Res, Jatni 752050, India

[37] Natl Cheng Kung Univ, Tainan 70101, Taiwan

[38] CAS, Nucl Phys Inst, Rez 25068, Czech Republic

[39] Ohio State Univ, Columbus, OH 43210 USA

[40] Inst Nucl Phys PAN, PL-31342 Krakow, Poland

[41] Panjab Univ, Chandigarh 160014, India

[42] Penn State Univ, University Pk, PA 16802 USA

[43] Inst High Energy Phys, NRC, Kurchatov Inst, Protvino 142281, Russia

[44] Purdue Univ, W Lafayette, IN 47907 USA

[45] Rice Univ, Houston, TX 77251 USA

[46] Rutgers State Univ, Piscataway, NJ 08854 USA

[47] Univ Sao Paulo, BR-05314970 Sao Paulo, Brazil

[48] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China

[49] Shandong Univ, Qingdao 266237, Shandong, Peoples R China

[50] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China

来源：

PHYSICAL REVIEW C | 2022年 / 106卷 / 03期

基金：

中国国家自然科学基金; 日本学术振兴会; 新加坡国家研究基金会; 美国国家科学基金会;

关键词：

HEAVY-ION COLLISIONS; PARITY VIOLATION; PB COLLISIONS; EVENT;

D O I：

10.1103/PhysRevC.106.034908

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：

Quark interactions with topological gluon configurations can induce local chirality imbalance and parity violation in quantum chromodynamics, which can lead to the chiral magnetic effect (CME)-an electric charge separation along the strong magnetic field in relativistic heavy-ion collisions. The CME-sensitive azimuthal correlator observable (Delta gamma) is contaminated by background arising, in part, from resonance decays coupled with elliptic anisotropy (v(2)). We report here differential measurements of the correlator as a function of the pair invariant mass (m(inv)) in 20-50% centrality Au + Au collisions at root s(NN) = 200 GeV by the STAR experiment at the BNL Relativistic Heavy Ion Collider. Strong resonance background contributions to Delta gamma. are observed. At large m(inv) where this background is significantly reduced, the Delta gamma. value is found to be significantly smaller. An event-shape-engineering technique is deployed to determine the v(2) background shape as a function of m(inv). We extract a v(2)-independent and m(inv)-averaged signal Delta gamma(sig) = (0.03 +/- 0.06 +/- 0.08) x 10(-4), or (2 +/- 4 +/- 5)% of the inclusive Delta gamma (m(inv) > 0.4 GeV/c(2)) = (1.58 +/- 0.02 +/- 0.02) x 10(-4), within pion p(T) = 0.2-0.8 GeV/c and averaged over pseudorapidity ranges of -1 < eta < -0.05 and 0.05 < eta < 1. This represents an upper limit of 0.23 x 10(-4), or 15% of the inclusive result, at 95% confidence level for the m(inv)-integrated CME contribution.

引用

页数：10

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