Relaxation time for the alignment between the spin of a finite-mass quark or antiquark and the thermal vorticity in relativistic heavy-ion collisions

被引：18

作者：

Ayala, Alejandro ^{[1
,2
,3
]}

de la Cruz, David ^{[4
]}

Hernandez, L. A. ^{[1
,2
,3
,5
]}

Salinas, Jordi ^{[1
]}

机构：

[1] Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Apartado Postal 70-543, Mexico City 04510, DF, Mexico

[2] Univ Cape Town, Ctr Theoret & Math Phys, ZA-7700 Rondebosch, South Africa

[3] Univ Cape Town, Dept Phys, ZA-7700 Rondebosch, South Africa

[4] Inst Politecn Nacl, Dept Fis, Escuela Super Fis & Matemat, Unidad Adolfo Lopez Mateos, Edificio 9, Mexico City 07738, DF, Mexico

[5] Univ Autonoma Tlaxcala, Fac Ciencias Educ, Tlaxcala 90000, Mexico

来源：

PHYSICAL REVIEW D | 2020年 / 102卷 / 05期

关键词：

LAMBDA HYPERON POLARIZATION;

D O I：

10.1103/PhysRevD.102.056019

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the relaxation time required for the alignment between the spin of a finite-mass quark or antiquark and the thermal vorticity, at finite temperature and baryon chemical potential, in the context of relativistic heavy-ion collisions. The relaxation time is computed as the inverse of the total reaction rate that in turn is obtained from the imaginary part of the quark or antiquark self-energy. We model the interaction between spin and thermal vorticity within the medium by means of a vertex coupling quarks and thermal gluons that, for a uniform temperature, is proportional to the global angular velocity and inversely proportional to the temperature. We use realistic estimates for the angular velocities for different collision energies and show that the effect of the quark mass is to reduce the relaxation times as compared to the massless quark case. Using these relaxation times we estimate the intrinsic quark and antiquark polarizations produced by the thermal vorticity. We conclude by pointing out that, although the intrinsic global polarization of the s-quark turns out to be larger than that of the (s) over bar -quark, there is room to explain recent STAR results which show that the global polarization of (Lambda) over bar is larger than that of Lambda when considering that these hyperons can be produced from different density regions in a core-corona model.

引用

页数：7

共 38 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] 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)

[4] 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-+

[5] Vortical susceptibility of finite-density QCD matter [J].

Aristova, A. ;

Frenklakh, D. ;

Gorsky, A. ;

Kharzeev, D. .

JOURNAL OF HIGH ENERGY PHYSICS, 2016, (10)

[6]

Ayala A., ARXIV200313757

[7] Relaxation time for quark spin and thermal vorticity alignment inheavy-ion collisions [J].

Ayala, Alejandro ;

de la Cruz, David ;

Hernandez-Ortiz, S. ;

Hernandez, L. A. ;

Salinas, Jordi .

PHYSICS LETTERS B, 2020, 801

[8] Microscopic models for ultrarelativistic heavy ion collisions [J].

Bass, SA ;

Belkacem, M ;

Bleicher, M ;

Brandstetter, M ;

Bravina, L ;

Ernst, C ;

Gerland, L ;

Hofmann, M ;

Hofmann, S ;

Konopka, J ;

Mao, G ;

Neise, L ;

Soff, S ;

Spieles, C ;

Weber, H ;

Winckelmann, LA ;

Stocker, H ;

Greiner, W ;

Hartnack, C ;

Aichelin, J ;

Amelin, N .

PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, VOL 41, 1998, 41 :255-369

[9] Hyperon polarization in heavy-ion collisions and holographic gravitational anomaly [J].

Baznat, Mircea ;

Gudima, Konstantin ;

Sorin, Alexander ;

Teryaev, Oleg .

PHYSICAL REVIEW C, 2018, 97 (04)

[10] A study of vorticity formation in high energy nuclear collisions [J].

Becattini, F. ;

Inghirami, G. ;

Rolando, V. ;

Beraudo, A. ;

Del Zanna, L. ;

De Pace, A. ;

Nardi, M. ;

Pagliara, G. ;

Chandra, V. .

EUROPEAN PHYSICAL JOURNAL C, 2015, 75 (09)

← 1 2 3 4 →