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: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, Czech Academy of Sciences
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Tsukuba
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Bergen
Date: 2020-06-30
Language: eng
Number of pages: 12
Belongs to series: Physical Review Letters
ISSN: 0031-9007
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
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