Relaxation time for strange quark spin in rotating quark-gluon plasma

Kapusta, Joseph I.; Rrapaj, Ermal; Rudaz, Serge

doi:10.1103/physrevc.101.024907

Title: Relaxation time for strange quark spin in rotating quark-gluon plasma

Journal Article · Wed Feb 12 00:00:00 EST 2020 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.101.024907· OSTI ID:1800658

^[1];

^[2]; Rudaz, Serge ^[1]

Univ. of Minnesota, Minneapolis, MN (United States)
Univ. of Minnesota, Minneapolis, MN (United States); Univ. of California, Berkeley, CA (United States)

Experiments at the Relativistic Heavy Ion Collider have measured the net polarization of $$\Lambda$$ and $$\bar{Λ }$$ hyperons and attributed it to a coupling between their spin and the vorticity of the fluid created in heavy-ion collisions. Equipartition of energy is generally assumed, but the dynamical mechanism which polarizes them has yet to be determined. We consider two such mechanisms: vorticity fluctuations and helicity flip in scatterings between strange quarks and light quarks and gluons. With reasonable parameters both mechanisms lead to equilibration times orders of magnitude too large to be relevant to heavy-ion collisions. In this work our conclusion is that strange quark spin or helicity is unchanged from the time they are created to the time they hadronize. A corollary is that vorticity fluctuations do not affect the hyperon spin, either.

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Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF); Heising-Simons Foundation

Grant/Contract Number:: FG02-87ER40328; PHY-1630782; 2017-228

OSTI ID:: 1800658

Alternate ID(s):: OSTI ID: 1599485

Journal Information:: Physical Review C, Vol. 101, Issue 2; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 28 works

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