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Polarization transfer in hyperon decays and its effect in relativistic nuclear collisions

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arxiv 1905.03123 v3 pith:KOCGL74R submitted 2019-05-08 nucl-th hep-ph

Polarization transfer in hyperon decays and its effect in relativistic nuclear collisions

F. Becattini (University of Florence) , Gaoqing Cao (Sun Yat-Sen University) , Enrico Speranza (University of Frankfurt) This is my paper
classification nucl-th hep-ph
keywords polarizationlambdasigmacomponentdecaysprimaryrelativisticcollisions
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We calculate the contribution to the polarization of $\Lambda$ hyperons in relativistic nuclear collisions at high energy from the decays of $\Sigma^*(1385)$ and $\Sigma^0$, which are the predominant sources of $\Lambda$ production besides the primary component, as a function of the $\Lambda$ momentum. Particularly, we estimate the longitudinal component of the mean spin vector as a function of the azimuthal angle in the transverse plane, assuming that primary $\Sigma^*$ and $\Sigma^0$ polarization follow the predictions of local thermodynamic equilibrium in a relativistic fluid. Provided that the rapidity dependence around midrapidity of polarization is negligible, we find that this component of the overall spin vector has a very similar pattern to the primary one. Therefore, we conclude that the secondary decays cannot account for the discrepancy in sign between experimental data and hydrodynamic model predictions of the longitudinal polarization of $\Lambda$ hyperons recently measured by the STAR experiment at RHIC.

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Forward citations

Cited by 4 Pith papers

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  1. Hyperon ($\Lambda$) polarization along the beam axis in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.36$ TeV

    nucl-ex 2026-06 unverdicted novelty 7.0

    First LHC measurement of beam-axis Lambda polarization relative to the third-order event plane, with improved precision on the second-order plane and sensitivity to QGP transport coefficients.

  2. Local Spin Polarization in Anisotropic Gubser Flow: Suppression Mechanism and Formulation Dependence

    nucl-th 2026-08 conditional novelty 6.0

    In an anisotropic Gubser flow, the longitudinal spin polarization's sign depends on which shear formulation is used, and two popular formulations show exact or near-exact cancellation between vorticity and shear contr...

  3. Exact expectation values in a boost-invariant fluid of Dirac fermions with finite spin density

    hep-th 2026-04 unverdicted novelty 6.0

    Exact calculations in a boost-invariant free Dirac fermion fluid show spin polarization arises only from finite spin potential, with shear-induced polarization and spin Hall effect absent.

  4. Global polarization of $\Lambda$, $\Xi^{-}$, and $\Omega^{-}$ hyperons in Au+Au collisions at RHIC BES-II energies

    nucl-th 2026-06 unverdicted novelty 4.0

    Hydrodynamic calculations show Omega hyperon polarization exceeds that of Lambda and Xi due to spin but falls below STAR data, with particle-antiparticle splitting growing at lower energies and driven by chemical pote...