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

Acharya S.
•
Adamova D.
•
Adler A.
altro
Zurlo N.
2020
  • journal article

Periodico
PHYSICAL REVIEW LETTERS
Abstract
The first evidence of spin alignment of vector mesons (K∗0 and φ) in heavy-ion collisions at the Large Hadron Collider (LHC) is reported. The spin density matrix element ρ00 is measured at midrapidity (|y|<0.5) in Pb-Pb collisions at a center-of-mass energy (sNN) of 2.76 TeV with the ALICE detector. ρ00 values are found to be less than 1/3 (1/3 implies no spin alignment) at low transverse momentum (pT<2 GeV/c) for K∗0 and φ at a level of 3σ and 2σ, respectively. No significant spin alignment is observed for the KS0 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.
DOI
10.1103/PhysRevLett.125.012301
WOS
WOS:000544122900003
Archivio
http://hdl.handle.net/11368/2981653
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85087940641
Diritti
open access
license:creative commons
license uri:http://creativecommons.org/licenses/by/4.0/
FVG url
https://arts.units.it/bitstream/11368/2981653/1/PRL_125(2020)012301_1-12.pdf
Soggetti
  • Relativistic heavy io...

  • spin-orbital

Scopus© citazioni
29
Data di acquisizione
Jun 7, 2022
Vedi dettagli
Web of Science© citazioni
77
Data di acquisizione
Mar 28, 2024
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