Hyperon polarization in relativistic heavy ion collisions and axial U(1) symmetry breaking at high temperature

被引：27

作者：

Kapusta, Joseph, I ^{[1
]}

Rrapaj, Ermal ^{[1
,2
]}

Rudaz, Serge ^{[1
]}

机构：

[1] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

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

来源：

PHYSICAL REVIEW C | 2020年 / 101卷 / 03期

基金：

美国国家科学基金会;

关键词：

INSTANTON DENSITY; QUARK; QCD;

D O I：

10.1103/PhysRevC.101.031901

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：

Experiments at the Relativistic Heavy Ion Collider have measured the net polarization of Lambda and (Lambda) over bar hyperons and attributed it to a coupling between their spin and the vorticity of the fluid created in heavy ion collisions, but how the spin comes to equilibrium with vorticity is an open problem. Recently, we found that vorticity fluctuations and helicity flip of strange quarks in quark-gluon plasma through perturbative QCD processes resulted in equilibration times far too long to be relevant. Here, we consider the Nambu-Jona-Lasinio model with the inclusion of the six-quark Kobayashi-Maskawa-'t Hooft interaction which breaks axial U(1). Using instanton inspired models for the temperature dependence of the axial symmetry breaking, we find that constituent strange quarks can reach spin equilibrium at temperatures below about 170 MeV, just before they hadronize to form hyperons.

引用

页数：5

共 35 条

[1] Global polarization measurement in Au plus Au collisions [J].

Abelev, B. I. ;

Aggarwal, M. M. ;

Ahammed, Z. ;

Anderson, B. D. ;

Arkhipkin, D. ;

Averichev, G. S. ;

Bai, Y. ;

Balewski, J. ;

Barannikova, O. ;

Barnby, L. S. ;

Baudot, J. ;

Baumgart, S. ;

Belaga, V. V. ;

Bellingeri-Laurikainen, A. ;

Bellwied, R. ;

Benedosso, F. ;

Betts, R. R. ;

Bhardwaj, S. ;

Bhasin, A. ;

Bhati, A. K. ;

Bichsel, H. ;

Bielcik, J. ;

Bielcikova, J. ;

Bland, L. C. ;

Blyth, S.-L. ;

Bombara, M. ;

Bonner, B. E. ;

Botje, M. ;

Bouchet, J. ;

Brandin, A. V. ;

Burton, T. P. ;

Bystersky, M. ;

Cai, X. Z. ;

Caines, H. ;

Sanchez, Calderon de la Barca ;

Callner, J. ;

Catu, O. ;

Cebra, D. ;

Cervantes, M. C. ;

Chajecki, Z. ;

Chaloupka, P. ;

Chattopadhyay, S. ;

Chen, H. F. ;

Chen, J. H. ;

Chen, J. Y. ;

Cheng, J. ;

Cherney, M. ;

Chikanian, A. ;

Christie, W. ;

Chung, S. U. .

PHYSICAL REVIEW C, 2007, 76 (02)

[2] Global polarization measurement in Au + Au collisions (vol 76, 2007) [J].

Abelev, B. I. ;

Aggarwal, M. M. ;

Ahammed, Z. ;

Anderson, B. D. ;

Arkhipkin, D. ;

Averichev, G. S. ;

Bai, Y. ;

Balewski, J. ;

Barannikova, O. ;

Barnby, L. S. ;

Baudot, J. ;

Baumgart, S. ;

Belaga, V. V. ;

Bellingeri-Laurikainen, A. ;

Bellwied, R. ;

Benedosso, F. ;

Betts, R. R. ;

Bhardwaj, S. ;

Bhasin, A. ;

Bhati, A. K. ;

Bichsel, H. ;

Bielcik, J. ;

Bielcikova, J. ;

Bland, L. C. ;

Blyth, S. -L. ;

Bombara, M. ;

Bonner, B. E. ;

Botje, M. ;

Bouchet, J. ;

Brandin, A. V. ;

Burton, T. P. ;

Bystersky, M. ;

Cai, X. Z. ;

Caines, H. ;

Sanchez, M. Calderon de la Barca ;

Callner, J. ;

Catu, O. ;

Cebra, D. ;

Cervantes, M. C. ;

Chajecki, Z. ;

Chaloupka, P. ;

Chattopadhyay, S. ;

Chen, H. F. ;

Chen, J. H. ;

Chen, J. Y. ;

Cheng, J. ;

Cherney, M. ;

Chikanian, A. ;

Christie, W. ;

Chung, S. U. .

PHYSICAL REVIEW C, 2017, 95 (03)

[3]

ABRIKOSOV AA, 1983, YAD FIZ, V37, P772

[4] Global polarization of Λ hyperons in Au plus Au collisions at √sNN=200 GeV [J].

Adam, J. ;

Adamczyk, L. ;

Adams, J. R. ;

Adkins, J. K. ;

Agakishiev, G. ;

Aggarwal, M. M. ;

Ahammed, Z. ;

Ajitanand, N. N. ;

Alekseev, I ;

Anderson, D. M. ;

Aoyama, R. ;

Aparin, A. ;

Arkhipkin, D. ;

Aschenauer, E. C. ;

Ashraf, M. U. ;

Atetalla, F. ;

Attri, A. ;

Averichev, G. S. ;

Bai, X. ;

Bairathi, V ;

Barish, K. ;

Bassin, A. J. ;

Behera, A. ;

Bellwied, R. ;

Bhasin, A. ;

Bhati, A. K. ;

Bielcik, J. ;

Bielcikova, J. ;

Bland, L. C. ;

Bordyuzhin, I. G. ;

Brandenburg, J. D. ;

Brandin, A., V ;

Brown, D. ;

Bryslawskyj, J. ;

Bunzarovi, I ;

Butterworth, J. ;

Caines, H. ;

Sanchez, M. Calderon de la Barca ;

Campbell, J. M. ;

Cebra, D. ;

Chakaberia, I ;

Chaloupka, P. ;

Chang, F-H ;

Chang, Z. ;

Chankova-Bunzarova, N. ;

Chatterjee, A. ;

Chattopadhyay, S. ;

Chen, J. H. ;

Chen, X. ;

Cheng, J. .

PHYSICAL REVIEW C, 2018, 98 (01)

[5] Global Λ hyperon polarization in nuclear collisions [J].

Adamczyk, L. ;

Adkins, J. K. ;

Agakishiev, G. ;

Aggarwal, M. M. ;

Ahammed, Z. ;

Ajitanand, N. N. ;

Alekseev, I. ;

Anderson, D. M. ;

Aoyama, R. ;

Aparin, A. ;

Arkhipkin, D. ;

Aschenauer, E. C. ;

Ashraf, M. U. ;

Attri, A. ;

Averichev, G. S. ;

Bai, X. ;

Bairathi, V. ;

Behera, A. ;

Bellwied, R. ;

Bhasin, A. ;

Bhati, A. K. ;

Bhattarai, P. ;

Bielcik, J. ;

Bielcikova, J. ;

Bland, L. C. ;

Bordyuzhin, I. G. ;

Bouchet, J. ;

Brandenburg, J. D. ;

Brandin, A. V. ;

Brown, D. ;

Bunzarov, I. ;

Butterworth, J. ;

Caines, H. ;

Sanchez, M. Calderon De la Barca ;

Campbell, J. M. ;

Cebra, D. ;

Chakaberia, I. ;

Chaloupka, P. ;

Chang, Z. ;

Chankova-Bunzarova, N. ;

Chatterjee, A. ;

Chattopadhyay, S. ;

Chen, X. ;

Chen, J. H. ;

Chen, X. ;

Cheng, J. ;

Cherney, M. ;

Christie, W. ;

Contin, G. ;

Crawford, H. J. .

NATURE, 2017, 548 (7665) :62-+

[6] Quasiparticle theory of transport coefficients for hadronic matter at finite temperature and baryon density [J].

Albright, M. ;

Kapusta, J. I. .

PHYSICAL REVIEW C, 2016, 93 (01)

[7]

Antinori F, 2019, NUCL PHYS A, V982, pV, DOI [10.1016/S0375-9474(18)30496-2, 10.1146/annurev-en-64-103018-100001]

[8] SCREENING OF INSTANTONS IN THE QUARK GAS [J].

BALUNI, V .

PHYSICS LETTERS B, 1981, 106 (06) :491-496

[9] Λ polarization in peripheral heavy ion collisions [J].

Becattini, F. ;

Csernai, L. P. ;

Wang, D. J. .

PHYSICAL REVIEW C, 2013, 88 (03)

[10] Angular momentum conservation in heavy ion collisions at very high energy [J].

Becattini, F. ;

Piccinini, F. ;

Rizzo, J. .

PHYSICAL REVIEW C, 2008, 77 (02)

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