Back-to-back relative-excess observable to identify the chiral magnetic effect

Feng, Yicheng; Zhao, Jie; Wang, Fuqiang

doi:10.1103/physrevc.101.014915

Title: Back-to-back relative-excess observable to identify the chiral magnetic effect

Journal Article · Mon Jan 27 00:00:00 UTC 2020 · Physical Review C

DOI: https://doi.org/10.1103/physrevc.101.014915 · OSTI ID:1802477

^[1];

^[2];

^[3]

Purdue Univ., West Lafayette, IN (United States); OSTI
Purdue Univ., West Lafayette, IN (United States)
Purdue Univ., West Lafayette, IN (United States); Huzhou University (China)

Background: The chiral magnetic effect (CME) is extensively studied in heavy-ion collisions at RHIC and LHC. In the commonly used reaction-plane (RP)-dependent, charge-dependent azimuthal correlator ($$Δ_γ$$), both the close and back-to-back pairs are included. Many backgrounds contribute to the close pairs (e.g., resonance decays, jet correlations), whereas the back-to-back pairs are relatively free of those backgrounds. Purpose: In order to reduce those backgrounds, we propose a new observable, which only focuses on the back-to-back pairs, namely, the relative back-to-back opposite-sign over same-sign pair excess ($$r_{BB}$$) as a function of the pair azimuthal orientation with respect to the RP ($$φ_{BB}$$). Methods: We use analytical calculations and toy model simulations to demonstrate the sensitivity of $$r_{BB}(φ_{BB})$$ to the CME and its insensitivity to backgrounds. Results: With finite CME, the $$φ_{BB}$$ distribution of $$r_{BB}$$ shows a clear characteristic modulation. Its sensitivity to background is significantly reduced compared to the previous $$Δ_γ$$ observable. The simulation results are consistent with our analytical calculations. Conclusions: In this work, our studies demonstrate that the $$r_{BB}(φ_{BB})$$ observable is sensitive to the CME signal and rather insensitive to the resonance backgrounds.

View Accepted Manuscript (DOE)

Cite

Export

Save

Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC)

Grant/Contract Number:: SC0012910

OSTI ID:: 1802477

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 1 Vol. 101; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

References (58)

Strong P, CP, T violations in heavy-ion collisions Morley, P. D.; Schmidt, I. A. Zeitschrift f�r Physik C Particles and Fields, Vol. 26, Issue 4 https://doi.org/10.1007/BF01551807	journal	December 1985
The effects of topological charge change in heavy ion collisions: “Event by event and violation” Kharzeev, Dmitri E.; McLerran, Larry D.; Warringa, Harmen J. Nuclear Physics A, Vol. 803, Issue 3-4 https://doi.org/10.1016/j.nuclphysa.2008.02.298	journal	May 2008
Measurements of the chiral magnetic effect with background isolation in 200 GeV Au+Au collisions at STAR Zhao, Jie Nuclear Physics A, Vol. 982 https://doi.org/10.1016/j.nuclphysa.2018.08.035	journal	February 2019
Resonance decay effects on anisotropy parameters Dong, X.; Esumi, S.; Sorensen, P. Physics Letters B, Vol. 597, Issue 3-4 https://doi.org/10.1016/j.physletb.2004.06.110	journal	September 2004
Constraining the magnitude of the Chiral Magnetic Effect with Event Shape Engineering in Pb–Pb collisions at s NN = 2.76 TeV Acharya, S.; Adam, J.; Adamová, D. Physics Letters B, Vol. 777 https://doi.org/10.1016/j.physletb.2017.12.021	journal	February 2018
Experimental searches for the chiral magnetic effect in heavy-ion collisions Zhao, Jie; Wang, Fuqiang Progress in Particle and Nuclear Physics, Vol. 107 https://doi.org/10.1016/j.ppnp.2019.05.001	journal	July 2019
Charge dependent particle correlations motivated by chiral magnetic effect and chiral vortical effect Zhao, Jie EPJ Web of Conferences, Vol. 141 https://doi.org/10.1051/epjconf/201714101010	journal	January 2017
Chiral magnetic effect search in p+Au, d+Au and Au+Au collisions at RHIC Zhao, Jie EPJ Web of Conferences, Vol. 172 https://doi.org/10.1051/epjconf/201817201005	journal	January 2018
Review of Particle Physics Olive, K. A. Chinese Physics C, Vol. 38, Issue 9 https://doi.org/10.1088/1674-1137/38/9/090001	journal	August 2014
Varying the chiral magnetic effect relative to flow in a single nucleus-nucleus collision Xu, Hao-Jie; Zhao, Jie; Wang, Xiao-Bao Chinese Physics C, Vol. 42, Issue 8 https://doi.org/10.1088/1674-1137/42/8/084103	journal	July 2018
Parity violation in hot QCD: How to detect it Voloshin, Sergei A. Physical Review C, Vol. 70, Issue 5 https://doi.org/10.1103/PhysRevC.70.057901	journal	November 2004
Azimuthal anisotropy in Au+Au collisions at s NN = 200 GeV Adams, J.; Aggarwal, M. M.; Ahammed, Z. Physical Review C, Vol. 72, Issue 1 https://doi.org/10.1103/PhysRevC.72.014904	journal	July 2005
Systematic measurements of identified particle spectra in pp , d + Au , and Au + Au collisions at the STAR detector Abelev, B. I.; Aggarwal, M. M.; Ahammed, Z. Physical Review C, Vol. 79, Issue 3 https://doi.org/10.1103/PhysRevC.79.034909	journal	March 2009
Remarks on possible local parity violation in heavy ion collisions Bzdak, Adam; Koch, Volker; Liao, Jinfeng Physical Review C, Vol. 81, Issue 3 https://doi.org/10.1103/PhysRevC.81.031901	journal	March 2010
Observation of charge-dependent azimuthal correlations and possible local strong parity violation in heavy-ion collisions Abelev, B. I.; Aggarwal, M. M.; Ahammed, Z. Physical Review C, Vol. 81, Issue 5 https://doi.org/10.1103/PhysRevC.81.054908	journal	May 2010
Effects of cluster particle correlations on local parity violation observables Wang, Fuqiang Physical Review C, Vol. 81, Issue 6 https://doi.org/10.1103/PhysRevC.81.064902	journal	June 2010
Parton energy loss in heavy-ion collisions via direct-photon and charged-particle azimuthal correlations Abelev, B. I.; Aggarwal, M. M.; Ahammed, Z. Physical Review C, Vol. 82, Issue 3 https://doi.org/10.1103/PhysRevC.82.034909	journal	September 2010
Charge separation effect in relativistic heavy ion collisions Liao, Jinfeng; Koch, Volker; Bzdak, Adam Physical Review C, Vol. 82, Issue 5 https://doi.org/10.1103/PhysRevC.82.054902	journal	November 2010
Azimuthal correlations from transverse momentum conservation and possible local parity violation Bzdak, Adam; Koch, Volker; Liao, Jinfeng Physical Review C, Vol. 83, Issue 1 https://doi.org/10.1103/PhysRevC.83.014905	journal	January 2011
Charge conservation at energies available at the BNL Relativistic Heavy Ion Collider and contributions to local parity violation observables Schlichting, Sören; Pratt, Scott Physical Review C, Vol. 83, Issue 1 https://doi.org/10.1103/PhysRevC.83.014913	journal	January 2011
Medium-modified jets and initial state fluctuations as sources of charge correlations measured at energies available at the BNL Relativistic Heavy Ion Collider (RHIC) Petersen, Hannah; Renk, Thorsten; Bass, Steffen A. Physical Review C, Vol. 83, Issue 1 https://doi.org/10.1103/PhysRevC.83.014916	journal	January 2011
Effects of momentum conservation and flow on angular correlations observed in experiments at the BNL Relativistic Heavy Ion Collider Pratt, Scott; Schlichting, Sören; Gavin, Sean Physical Review C, Vol. 84, Issue 2 https://doi.org/10.1103/PhysRevC.84.024909	journal	August 2011
Event-by-event background in estimates of the chiral magnetic effect Toneev, V. D.; Konchakovski, V. P.; Voronyuk, V. Physical Review C, Vol. 86, Issue 6 https://doi.org/10.1103/PhysRevC.86.064907	journal	December 2012
Fluctuations of charge separation perpendicular to the event plane and local parity violation in s NN = 200 GeV Au + Au collisions at the BNL Relativistic Heavy Ion Collider Adamczyk, L.; Adkins, J. K.; Agakishiev, G. Physical Review C, Vol. 88, Issue 6 https://doi.org/10.1103/PhysRevC.88.064911	journal	December 2013
Measurement of charge multiplicity asymmetry correlations in high-energy nucleus-nucleus collisions at s N N = 200 GeV Adamczyk, L.; Adkins, J. K.; Agakishiev, G. Physical Review C, Vol. 89, Issue 4 https://doi.org/10.1103/PhysRevC.89.044908	journal	April 2014
Measurements of dielectron production in Au + Au collisions at s N N = 200 GeV from the STAR experiment Adamczyk, L.; Adkins, J. K.; Agakishiev, G. Physical Review C, Vol. 92, Issue 2 https://doi.org/10.1103/PhysRevC.92.024912	journal	August 2015
Challenges in flow background removal in search for the chiral magnetic effect Wang, Fuqiang; Zhao, Jie Physical Review C, Vol. 95, Issue 5 https://doi.org/10.1103/PhysRevC.95.051901	journal	May 2017
Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in p Pb and PbPb collisions at the CERN Large Hadron Collider Sirunyan, A. M.; Tumasyan, A.; Adam, W. Physical Review C, Vol. 97, Issue 4 https://doi.org/10.1103/PhysRevC.97.044912	journal	April 2018
Responses of the chiral-magnetic-effect–sensitive sine observable to resonance backgrounds in heavy-ion collisions Feng, Yicheng; Zhao, Jie; Wang, Fuqiang Physical Review C, Vol. 98, Issue 3 https://doi.org/10.1103/PhysRevC.98.034904	journal	September 2018
Vacuum stability and vacuum excitation in a spin-0 field theory Lee, T. D.; Wick, G. C. Physical Review D, Vol. 9, Issue 8 https://doi.org/10.1103/PhysRevD.9.2291	journal	April 1974
Azimuthal Charged-Particle Correlations and Possible Local Strong Parity Violation Abelev, B. I.; Aggarwal, M. M.; Ahammed, Z. Physical Review Letters, Vol. 103, Issue 25 https://doi.org/10.1103/PhysRevLett.103.251601	journal	December 2009
Azimuthal Anisotropy of π 0 Production in Au + Au Collisions at s N N = 200 GeV : Path-Length Dependence of Jet Quenching and the Role of Initial Geometry Adare, A.; Afanasiev, S.; Aidala, C. Physical Review Letters, Vol. 105, Issue 14 https://doi.org/10.1103/PhysRevLett.105.142301	journal	September 2010
Charge separation relative to the reaction plane in Pb-Pb collisions at s N N = 2.76 TeV Abelev, B.; Adam, J.; Adamová, D. Physical Review Letters, Vol. 110, Issue 1 https://doi.org/10.1103/PhysRevLett.110.012301	journal	January 2013
Beam-Energy Dependence of Charge Separation along the Magnetic Field in Au + Au Collisions at RHIC Adamczyk, L.; Adkins, J. K.; Agakishiev, G. Physical Review Letters, Vol. 113, Issue 5 https://doi.org/10.1103/PhysRevLett.113.052302	journal	July 2014
Observation of Charge-Dependent Azimuthal Correlations in p − Pb Collisions and Its Implication for the Search for the Chiral Magnetic Effect Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A. Physical Review Letters, Vol. 118, Issue 12 https://doi.org/10.1103/PhysRevLett.118.122301	journal	March 2017
Importance of Isobar Density Distributions on the Chiral Magnetic Effect Search Xu, Hao-jie; Wang, Xiaobao; Li, Hanlin Physical Review Letters, Vol. 121, Issue 2 https://doi.org/10.1103/PhysRevLett.121.022301	journal	July 2018
Possibility of Spontaneous Parity Violation in Hot QCD Kharzeev, Dmitri; Pisarski, Robert D.; Tytgat, Michel H. G. Physical Review Letters, Vol. 81, Issue 3 https://doi.org/10.1103/PhysRevLett.81.512	journal	July 1998
Suppressed π 0 Production at Large Transverse Momentum in Central A u + A u Collisions at s N N = 200 G e V Adler, S. S.; Afanasiev, S.; Aidala, C. Physical Review Letters, Vol. 91, Issue 7 https://doi.org/10.1103/PhysRevLett.91.072301	journal	August 2003
ρ 0 Production and Possible Modification in A u + A u and p + p Collisions at s N N = 200 G e V Adams, J.; Adler, C.; Aggarwal, M. M. Physical Review Letters, Vol. 92, Issue 9 https://doi.org/10.1103/PhysRevLett.92.092301	journal	March 2004
Identified Particle Distributions in p p and Au + Au Collisions at s N N = 200 GeV Adams, J.; Adler, C.; Aggarwal, M. M. Physical Review Letters, Vol. 92, Issue 11 https://doi.org/10.1103/PhysRevLett.92.112301	journal	March 2004
Search for the chiral magnetic effect in relativistic heavy-ion collisions Zhao, Jie International Journal of Modern Physics A, Vol. 33, Issue 13 https://doi.org/10.1142/S0217751X18300107	journal	May 2018
Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in pPb and PbPb collisions at the CERN Large Hadron Collider Sirunyan, Albert M.; Tumasyan, Armen; Adam, Wolfgang RWTH Aachen University https://doi.org/10.18154/rwth-2018-224073	text	January 2018
Review of Particle Physics Beringer, J.; Arguin, J.; Barnett, R. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/phppubdb-24149	text	January 2012
Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in $p\mathrm{Pb}$ and PbPb collisions at the CERN Large Hadron Collider Sirunyan, Albert M.; Tumasyan, Armen; Adam, Wolfgang Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2018-02420	text	January 2018
Review of Particle Physics Tanabashi, M.; Hagiwara, K.; Hikasa, K. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2018-03100	text	January 2018
Constraints on the chiral magnetic effect using charge-dependent azimuthal correlations in pPb and PbPb collisions at the CERN Large Hadron Collider Collaboration, Cms; Sirunyan, Albert M.; Backhaus, Malte ETH Zurich https://doi.org/10.3929/ethz-b-000263261	text	January 2018
The effects of topological charge change in heavy ion collisions: "Event by event P and CP violation" Kharzeev, Dmitri E.; McLerran, Larry D.; Warringa, Harmen J. arXiv https://doi.org/10.48550/arxiv.0711.0950	text	January 2007
Observation of charge-dependent azimuthal correlations and possible local strong parity violation in heavy ion collisions Collaboration, Star; Abelev, B. I. arXiv https://doi.org/10.48550/arxiv.0909.1717	text	January 2009
Remarks on possible local parity violation in heavy ion collisions Bzdak, Adam; Koch, Volker; Liao, Jinfeng arXiv https://doi.org/10.48550/arxiv.0912.5050	text	January 2009
Event-by-event background in estimates of the chiral magnetic effect Toneev, V. D.; Konchakovski, V. P.; Voronyuk, V. arXiv https://doi.org/10.48550/arxiv.1208.2519	text	January 2012
Challenges in flow background removal in search for the chiral magnetic effect Wang, Fuqiang; Zhao, Jie arXiv https://doi.org/10.48550/arxiv.1608.06610	text	January 2016
Varying the chiral magnetic effect relative to flow in a single nucleus-nucleus collision Xu, Hao-jie; Zhao, Jie; Wang, Xiaobao arXiv https://doi.org/10.48550/arxiv.1710.07265	text	January 2017
Responses of the chiral-magnetic-effect-sensitive sine observable to resonance backgrounds in heavy-ion collisions Feng, Yicheng; Zhao, Jie; Wang, Fuqiang arXiv https://doi.org/10.48550/arxiv.1803.02860	text	January 2018
Search for the Chiral Magnetic Effect in Relativistic Heavy-Ion Collisions Zhao, Jie arXiv https://doi.org/10.48550/arxiv.1805.02814	text	January 2018
Possibility of spontaneous parity violation in hot QCD Kharzeev, D.; Pisarski, R. D.; Tytgat, M. H. G. arXiv https://doi.org/10.48550/arxiv.hep-ph/9804221	text	January 1998
Resonance decay effects on anisotropy parameters Dong, X.; Esumi, S.; Sorensen, P. arXiv https://doi.org/10.48550/arxiv.nucl-th/0403030	text	January 2004
Review of Particle Physics Group, Particle Data; Amsler, C.; Doser, M. Elsevier https://doi.org/10.5167/uzh-11249	text	January 2008
Observation of charge-dependent azimuthal correlations in p-Pb collisions and its implication for the search for the chiral magnetic effect Collaboration, Cms; Canelli, Maria Florencia; Kilminster, Benjamin American Physical Society https://doi.org/10.5167/uzh-140774	text	January 2017

Similar Records

Influence of the chiral magnetic effect on particle-pair elliptic anisotropy

Journal Article · Thu Feb 06 00:00:00 UTC 2025 · Physical Review. C · OSTI ID:2511322

Li, Han-Sheng; Feng, Yicheng; Wang, Fuqiang

Deciphering the

R_{Ψ_{m}}

correlator in search for the chiral magnetic effect in relativistic heavy ion collisions

Journal Article · Mon Mar 01 00:00:00 UTC 2021 · Physical Review. C · OSTI ID:1851772

Feng, Yicheng; Zhao, Jie; Xu, Hao-jie; +1 more

Investigating event-shape methods in the search for the chiral magnetic effect in relativistic heavy ion collisions

Journal Article · Mon Nov 03 00:00:00 UTC 2025 · Physical Review. C · OSTI ID:3010274

Li, Han-Sheng; Feng, Yicheng; Wang, Fuqiang

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Physics

Title: Back-to-back relative-excess observable to identify the chiral magnetic effect

Citation Formats

References (58)

Similar Records

Related Subjects