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Title: Global polarization measurement in Au+Au collisions.

Abstract

The system created in noncentral relativistic nucleus-nucleus collisions possesses large orbital angular momentum. Because of spin-orbit coupling, particles produced in such a system could become globally polarized along the direction of the system angular momentum. We present the results of {Lambda} and {bar {Lambda}} hyperon global polarization measurements in Au+Au collisions at {radical}s{sub NN} = 62.4 and 200 GeV performed with the STAR detector at the BNL Relativistic Heavy Ion Collider (RHIC). The observed global polarization of {Lambda} and {bar {Lambda}} hyperons in the STAR acceptance is consistent with zero within the precision of the measurements. The obtained upper limit, |P{Lambda},{bar {Lambda}}| {le} 0.02, is compared with the theoretical values discussed recently in the literature.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); Swiss NSF
OSTI Identifier:
966340
Report Number(s):
ANL-HEP-PR-09-99
Journal ID: ISSN 0556-2813; PRVCAN; TRN: US0903946
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. C; Journal Volume: 76; Journal Issue: 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 74 ATOMIC AND MOLECULAR PHYSICS; ACCURACY; ANGULAR MOMENTUM; BNL; HEAVY IONS; HYPERONS; ORBITAL ANGULAR MOMENTUM; POLARIZATION

Citation Formats

Abelev, B. I., Aggarwal, M. M., Ahammed, Z., Anderson, B. D., Arkhipkin, D., Krueger, K., Spinka, H. M., Underwood, D. G., STAR Collaboration, High Energy Physics, Univ. of Illinois, Panjab Univ., Variable Energy Cyclotron Centre, Kent State Univ., and Particle Physics Lab. Global polarization measurement in Au+Au collisions.. United States: N. p., 2007. Web. doi:10.1103/PhysRevC.76.024915.
Abelev, B. I., Aggarwal, M. M., Ahammed, Z., Anderson, B. D., Arkhipkin, D., Krueger, K., Spinka, H. M., Underwood, D. G., STAR Collaboration, High Energy Physics, Univ. of Illinois, Panjab Univ., Variable Energy Cyclotron Centre, Kent State Univ., & Particle Physics Lab. Global polarization measurement in Au+Au collisions.. United States. doi:10.1103/PhysRevC.76.024915.
Abelev, B. I., Aggarwal, M. M., Ahammed, Z., Anderson, B. D., Arkhipkin, D., Krueger, K., Spinka, H. M., Underwood, D. G., STAR Collaboration, High Energy Physics, Univ. of Illinois, Panjab Univ., Variable Energy Cyclotron Centre, Kent State Univ., and Particle Physics Lab. Mon . "Global polarization measurement in Au+Au collisions.". United States. doi:10.1103/PhysRevC.76.024915.
@article{osti_966340,
title = {Global polarization measurement in Au+Au collisions.},
author = {Abelev, B. I. and Aggarwal, M. M. and Ahammed, Z. and Anderson, B. D. and Arkhipkin, D. and Krueger, K. and Spinka, H. M. and Underwood, D. G. and STAR Collaboration and High Energy Physics and Univ. of Illinois and Panjab Univ. and Variable Energy Cyclotron Centre and Kent State Univ. and Particle Physics Lab.},
abstractNote = {The system created in noncentral relativistic nucleus-nucleus collisions possesses large orbital angular momentum. Because of spin-orbit coupling, particles produced in such a system could become globally polarized along the direction of the system angular momentum. We present the results of {Lambda} and {bar {Lambda}} hyperon global polarization measurements in Au+Au collisions at {radical}s{sub NN} = 62.4 and 200 GeV performed with the STAR detector at the BNL Relativistic Heavy Ion Collider (RHIC). The observed global polarization of {Lambda} and {bar {Lambda}} hyperons in the STAR acceptance is consistent with zero within the precision of the measurements. The obtained upper limit, |P{Lambda},{bar {Lambda}}| {le} 0.02, is compared with the theoretical values discussed recently in the literature.},
doi = {10.1103/PhysRevC.76.024915},
journal = {Phys. Rev. C},
number = 2007,
volume = 76,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}