Publication: Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions
Дата
2020
Авторы
Acharya, S.
Adamova, D.
Adler, A.
Adolfsson, J.
Belyaev, V.
Bogdanov, A.
Bolozdynya, A.
Borissov, A.
Grigoriev, V.
Kaplin, V.
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Аннотация
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.
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Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions / Acharya, S [et al.] // Physical Review Letters. - 2020. - 125. - № 1. - 10.1103/PhysRevLett.125.012301
URI
https://www.doi.org/10.1103/PhysRevLett.125.012301
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https://openrepository.mephi.ru/handle/123456789/21988
https://www.scopus.com/record/display.uri?eid=2-s2.0-85087940641&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000544122900003
https://openrepository.mephi.ru/handle/123456789/21988