Impact of globally spin-aligned vector mesons on the search for the chiral magnetic effect in heavy-ion collisions
In high-energy heavy-ion collisions, the chiral magnetic effect (CME) is predicted to arise from the interplay between the chirality imbalance of quarks in the nuclear medium and the intense magnetic field, and will cause a charge separation along the magnetic field direction. While the search for t...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-04-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269323001119 |
| _version_ | 1797867680521256960 |
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| author | Diyu Shen Jinhui Chen Aihong Tang Gang Wang |
| author_facet | Diyu Shen Jinhui Chen Aihong Tang Gang Wang |
| author_sort | Diyu Shen |
| collection | DOAJ |
| description | In high-energy heavy-ion collisions, the chiral magnetic effect (CME) is predicted to arise from the interplay between the chirality imbalance of quarks in the nuclear medium and the intense magnetic field, and will cause a charge separation along the magnetic field direction. While the search for the CME is still ongoing in experiments at Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC), the CME-sensitive observables need to be scrutinized to exclude the non-CME contributions. In this work, we examine the influence of globally spin-aligned ρ mesons on the γ112 correlator, the RΨ2(ΔS) correlator, and the signed balance functions, via a toy model and a multiphase transport model (AMPT). The global spin alignment of vector mesons could originate from non-CME mechanisms in heavy-ion collisions, and is characterized by the 00-component of the spin density matrix, ρ00. We find that the CME observables show similar dependence on ρ00, and could receive a positive (negative) contribution from ρ-decay pions, if the ρ00 of ρ mesons is larger (smaller) than 1/3. Since pions are the most abundant particles in such collisions, the ρ00 measurements for ρ mesons become crucial to the interpretation of the CME data. |
| first_indexed | 2024-04-09T23:45:07Z |
| format | Article |
| id | doaj.art-acc6f10fe6794095a9cb1608e9251ba8 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-04-09T23:45:07Z |
| publishDate | 2023-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-acc6f10fe6794095a9cb1608e9251ba82023-03-18T04:40:00ZengElsevierPhysics Letters B0370-26932023-04-01839137777Impact of globally spin-aligned vector mesons on the search for the chiral magnetic effect in heavy-ion collisionsDiyu Shen0Jinhui Chen1Aihong Tang2Gang Wang3Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Fudan University, Shanghai 200433, China; Shanghai Research Center for Theoretical Nuclear Physics, NSFC and Fudan University, Shanghai 200438, ChinaKey Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Fudan University, Shanghai 200433, China; Shanghai Research Center for Theoretical Nuclear Physics, NSFC and Fudan University, Shanghai 200438, ChinaBrookhaven National Laboratory, Upton, NY 11973, USA; Corresponding author.Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USAIn high-energy heavy-ion collisions, the chiral magnetic effect (CME) is predicted to arise from the interplay between the chirality imbalance of quarks in the nuclear medium and the intense magnetic field, and will cause a charge separation along the magnetic field direction. While the search for the CME is still ongoing in experiments at Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC), the CME-sensitive observables need to be scrutinized to exclude the non-CME contributions. In this work, we examine the influence of globally spin-aligned ρ mesons on the γ112 correlator, the RΨ2(ΔS) correlator, and the signed balance functions, via a toy model and a multiphase transport model (AMPT). The global spin alignment of vector mesons could originate from non-CME mechanisms in heavy-ion collisions, and is characterized by the 00-component of the spin density matrix, ρ00. We find that the CME observables show similar dependence on ρ00, and could receive a positive (negative) contribution from ρ-decay pions, if the ρ00 of ρ mesons is larger (smaller) than 1/3. Since pions are the most abundant particles in such collisions, the ρ00 measurements for ρ mesons become crucial to the interpretation of the CME data.http://www.sciencedirect.com/science/article/pii/S0370269323001119 |
| spellingShingle | Diyu Shen Jinhui Chen Aihong Tang Gang Wang Impact of globally spin-aligned vector mesons on the search for the chiral magnetic effect in heavy-ion collisions Physics Letters B |
| title | Impact of globally spin-aligned vector mesons on the search for the chiral magnetic effect in heavy-ion collisions |
| title_full | Impact of globally spin-aligned vector mesons on the search for the chiral magnetic effect in heavy-ion collisions |
| title_fullStr | Impact of globally spin-aligned vector mesons on the search for the chiral magnetic effect in heavy-ion collisions |
| title_full_unstemmed | Impact of globally spin-aligned vector mesons on the search for the chiral magnetic effect in heavy-ion collisions |
| title_short | Impact of globally spin-aligned vector mesons on the search for the chiral magnetic effect in heavy-ion collisions |
| title_sort | impact of globally spin aligned vector mesons on the search for the chiral magnetic effect in heavy ion collisions |
| url | http://www.sciencedirect.com/science/article/pii/S0370269323001119 |
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