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Nuclear Theory·nucl-th

Wednesday·August 7, 2024

4 papers—1 primary·3 cross-listed

All4Primary1Cross-lists3
  1. 02

    A new method to clarify contribution of chiral magnetic effect in small collision system involving a transversely polarized proton

    Gui-Zhen Wu🇨🇳 · Zong-Wei Zhang🇨🇳 · Chen Gao🇨🇳 · Yi Xu🇨🇳 · Wei-Tian Deng🇨🇳

    In this paper, we propose a new experiment method to check contribution of chiral magnetic effect (CME). With experimental data of DIS involving transversely polarized proton, we have calculated the 3-D charge density inside the polarized proton, which is found to have a significant violation to spherical symmetry. Then we have calculated the property of electromagnetic field (E-M field) generated by a single transversely polarized proton (). Based on them, the E-M field generated in small collision system are studied. We find that the orientation of this E-M field has a significant dependence on the polarization direction of the proton, and the correlator ( ) has also significant dependence on the angle between reaction plane and polarization direction. As background contribution are canceled comparing two collision geometry schemes, only contribution of CME is remained.

    ↳ hep-phnucl-thPRC(2024)·2 citations
  2. 03

    Hybrid approach to perfect and dissipative spin hydrodynamics

    Zbigniew Drogosz🇵🇱 · Wojciech Florkowski🇵🇱 · Mykhailo Hontarenko🇵🇱

    A hybrid framework of spin hydrodynamics is proposed that combines the results of kinetic theory for particles with spin 1/2 with the Israel-Stewart method of introducing nonequilibrium dynamics. The framework of kinetic theory is used to define the perfect-fluid description that conserves baryon number, energy, linear momentum and spin part of angular momentum. This leads to the entropy conservation although, in the presence of spin degrees of freedom, the perfect-fluid formalism includes extra terms whose structure is usually attributed to dissipation. The genuine dissipative terms appear from the condition of positive entropy production in nonequilibrium processes. They are responsible for the transfer between the spin and orbital parts of angular momentum, with the total angular momentum being conserved.

    ↳ hep-phnucl-thPRD(2024)·32 citations
  3. 04

    Jet Definition and Transverse-Momentum-Dependent Factorization in Semi-Inclusive Deep-Inelastic Scattering

    Paul Caucal🇫🇷 · Edmond Iancu🇫🇷 · A. H. Mueller🇺🇸 · Feng Yuan🇺🇸

    Using the colour dipole picture of Deep Inelastic Scattering (DIS) and the Colour Glass Condensate effective theory, we study semi-inclusive jet production in DIS at small in the limit where the photon virtuality is much larger than the transverse momentum squared of the produced jet. In this limit, the cross-section is dominated by aligned jet configurations, that is, quark-antiquark pairs in which one of the fermions -- the would-be struck quark in the Breit frame -- carries most of the longitudinal momentum of the virtual photon. We show that physically meaningful jet definitions in DIS are such that the effective axis of the jet sourced by the struck quark is controlled by its virtuality rather than by its transverse momentum. For such jet definitions, we show that the next-to-leading order (NLO) cross-section admits factorisation in terms of the (sea) quark transverse momentum dependent (TMD) distribution, which in turn satisfies a universal Dokshitzer-Gribov-Lipatov-Altarelli-Parisi and Sudakov evolution.

    ↳ hep-phnucl-thPRL(2025)·20 citations

Affiliations

first authorsco-authorsvia INSPIRE