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Nuclear Theory·nucl-th

Tuesday·June 25, 2019

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 01

    Local spin polarization in high energy heavy ion collisions

    Hong-Zhong Wu🇨🇳 · Long-Gang Pang🇺🇸 · Xu-Guang Huang🇨🇳 · Qun Wang🇨🇳

    We revisit the azimuthal angle dependence of the local spin polarization of hyperons in heavy-ion collisions at 200 GeV in the framework of the (3+1)D viscous hydrodynamic model CLVisc. Two different initial conditions are considered in our simulation: the optical Glauber initial condition without initial orbital angular momentum and the AMPT initial condition with an initial orbital angular momentum. We find that the azimuthal angle dependence of the hyperon polarization strongly depends on the choice of the so-called "spin chemical potential" . With chosen to be proportional to the temperature vorticity, our simulation shows qualitatively coincidental results with the recent measurements at RHIC for both the longitudinal and transverse polarization. We argue that such a coincidence may be related to the fact that the temperature vorticity is approximately conserved in the hot quark-gluon matter.

    nucl-thPhys.Rev.Research.(2019)·121 citations
  2. 02

    Nuclear modification of jet shape for inclusive jets and -jets at the LHC energies

    Ning-Bo Chang🇨🇳 · Yasuki Tachibana🇺🇸 · Guang-You Qin🇨🇳

    With our coupled jet-fluid model, we study the nuclear modifications of full jets and jet structures for single inclusive jets and -jets in Pb+Pb collisions at ~ATeV and ~ATeV. The in-medium evolution of full jet shower is described by a set of coupled transport equations including the effects of collisional energy loss, transverse momentum broadening and medium-induced splitting process. The dynamical evolution of bulk medium is simulated by solving relativistic hydrodynamic equation with source term which accounts for the energy and momentum deposited by hard jet shower to soft medium. Our study demonstrates that the hydrodynamic medium response to jet propagation significantly enhances the broadening of jet shape at large angles and is essential for the cone-size dependence of jet energy loss and nuclear modification factor of inclusive jet production. It is also found that the nuclear modification pattern of jet shape is sensitive to jet energy but has weak dependence on the flavor of the parton that initiates the jet. Our result can naturally explain the different nuclear modification patterns of jet shape functions for single inclusive jet and -jet events as observed by the CMS Collaboration, and can be tested in the future by measuring the jet shape function over a wider range of jet energies in heavy-ion collisions.

    nucl-thhep-phnucl-exPLB(2020)·60 citations
  3. 03

    Finite size of hardons and HBT interferometry for hydrodynamic sources

    Yong Zhang🇨🇳 · Hong-Jie Yin🇨🇳 · Weihua Wu🇨🇳

    Hadrons formed in heavy-ion collisions are not point-like objects, they cannot occupy too close space-time points. When the two bosons are too close to each other, their constituents start to mix and they cannot be considered as bosons subjected to Bose-Einstein statistics, this effect is called excluded volume effect. We study the volume effect on HBT for the sources with various sizes. The effect on HBT was shown in out, side and long directions, and it is more obvious for the source with a narrow space-time distribution. The correlation functions for high transverse momenta are more suppressed by the volume effect. Hence the incoherence parameter may be more suppressed by the volume effect for high transverse momenta in small collision systems.

    nucl-thhep-phIJMPE(2020)·0 citations
  4. 04

    Radiative corrections to Gamow-Teller decays

    Leendert Hayen🇧🇪 · Nathal Severijns🇧🇪

    Radiative corrections in the electroweak sector constitute an essential component in the ability to disentangle Beyond Standard Model physics from experimental data. This is particularly relevant for strongly bound systems undergoing weak decays such as nuclear decay, where its contribution to top-row CKM unitarity tests is essential. In this Letter we note the need for an additional radiative correction to the Gamow-Teller form factor in allowed decays. It concerns a combination of electrostatic final state interactions and QCD-induced currents. We review the basic derivation and report analytical results. Due to differences in their theoretical treatment in the literature, effects on the neutron and mirror systems are distinct. Significant consequences appear for a comparison of the former with lattice QCD, while changes occur in the extraction in the latter. We discuss new limits on right-handed currents and provide a new value for from mirror decays.

    nucl-thnucl-ex16 citations

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first authorsco-authorsvia INSPIRE