Spin relaxation rate for baryons in a thermal pion gas

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書誌事項

公開日
2024-05-16
資源種別
journal article
権利情報
  • https://creativecommons.org/licenses/by/4.0/
DOI
  • 10.1103/physrevc.109.054909
公開者
American Physical Society (APS)

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説明

<jats:p>We study the relaxation dynamics of the spin polarization of baryons (nucleon and <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi mathvariant="normal">Λ</a:mi></a:math> baryon), in a thermal pion gas as a simple model of the hadronic phase of the QCD plasma produced in relativistic heavy-ion collisions. For this purpose, we formulate the quantum kinetic theory for the spin density matrix of baryons in the leading order of the gradient expansion. Considering the baryon-pion elastic scattering processes as the dominant interaction between baryons and thermal pions, we compute the spin relaxation rate of nucleons and <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mi mathvariant="normal">Λ</c:mi></c:math> baryons in a pion gas up to temperature 200 MeV. In the case of nucleons, we evaluate the spin relaxation rate in the <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"><e:mi>s</e:mi></e:math>-channel resonance approximation, based on the known experimental data on <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"><f:mi mathvariant="normal">Δ</f:mi></f:math> resonances. We also estimate the spin relaxation rate for <h:math xmlns:h="http://www.w3.org/1998/Math/MathML"><h:mi mathvariant="normal">Λ</h:mi></h:math> baryons, based on experimental inputs and theoretical models for the low-energy <j:math xmlns:j="http://www.w3.org/1998/Math/MathML"><j:mrow><j:mi mathvariant="normal">Λ</j:mi><j:mi>π</j:mi></j:mrow></j:math> scattering, including the chiral perturbation theory.</jats:p> <jats:sec> <jats:title/> <jats:supplementary-material> <jats:permissions> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2024</jats:copyright-year> </jats:permissions> </jats:supplementary-material> </jats:sec>

収録刊行物

  • Physical Review C

    Physical Review C 109 (5), 2024-05-16

    American Physical Society (APS)

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