Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions

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The ALICE Collaboration , Acharya , S , Brucken , E J , Hilden , T E , Kim , D J , Krizek , F , Litichevskyi , V , Novitzky , N , Orava , R , Parkkila , J E , Rak , J , Rasanen , S S , Rytkonen , H , Saarimäki , O A M , Slupecki , M , Snellman , T W , Trzaska , W H & Zhou , Z 2020 , ' Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions ' , Physical Review Letters , vol. 125 , no. 1 , 012301 . https://doi.org/10.1103/PhysRevLett.125.012301

Title: Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions
Author: The ALICE collaboration; Acharya, S.; Brucken, E. J.; Hilden, T. E.; Kim, D. J.; Krizek, F.; Litichevskyi, Vladyslav; Novitzky, N.; Orava, R.; Parkkila, J. E.; Rak, J.; Rasanen, S. S.; Rytkonen, H.; Saarimäki, Oskari Antti Matti; Slupecki, M.; Snellman, T. W.; Trzaska, W. H.; Zhou, Z.
Contributor organization: Helsinki Institute of Physics
Date: 2020-06-30
Language: eng
Number of pages: 12
Belongs to series: Physical Review Letters
ISSN: 0031-9007
DOI: https://doi.org/10.1103/PhysRevLett.125.012301
URI: http://hdl.handle.net/10138/321058
Abstract: The first evidence of spin alignment of vector mesons (K*(0) and phi) in heavy-ion collisions at the Large Hadron Collider (LHC) is reported. The spin density matrix element rho(00) is measured at midrapidity (vertical bar y vertical bar <0.5) in Pb-Pb collisions at a center-of-mass energy root(s)NNof 2.76 TeV with the ALICE detector. rho(00) values are found to be less than 1/3 (1/3 implies no spin alignment) at low transverse momentum (p(T) <2 GeV / c) for K*(0) and phi at a level of 3 sigma and 2 sigma, respectively. No significant spin alignment is observed for the K-S(0) meson (spin = 0) in Pb-Pb collisions and for the vector mesons in pp collisions. The measured spin alignment is unexpectedly large but qualitatively consistent with the expectation from models which attribute it to a polarization of quarks in the presence of angular momentum in heavy-ion collisions and a subsequent hadronization by the process of recombination.
Subject: 114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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