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Nuclear Theory·nucl-th

Friday·December 23, 2016

13 papers—6 primary·7 cross-listed

All13Primary6Cross-lists7
  1. 01

    Quasiparticle second-order viscous hydrodynamics from kinetic theory

    Leonardo Tinti🇺🇸 · Amaresh Jaiswal🇩🇪 · Radoslaw Ryblewski🇵🇱

    We present the derivation of second-order relativistic viscous hydrodynamics from an effective Boltzmann equation for a system consisting of quasiparticles of a single species. We consider temperature-dependent masses of the quasiparticles and devise a thermodynamically-consistent framework to formulate second-order evolution equations for shear and bulk viscous pressure corrections. The main advantage of this formulation is that one can consistently implement realistic equation of state of the medium within the framework of kinetic theory. Specializing to the case of one-dimensional purely-longitudinal boost-invariant expansion, we study the effect of this new formulation on viscous hydrodynamic evolution of strongly-interacting matter formed in relativistic heavy-ion collisions.

    nucl-thhep-phPRD(2017)·50 citations
  2. 02

    Extracting Neutron Polarizabilities from Compton Scattering on The Quasi-Free Neutrons in

    Berhan Demissie🇺🇸 · Harald W. Grießhammer🇺🇸

    Compton scattering processes are ideal to study electric and magnetic dipole polarizabilities of nucleons. These fundamental quantities parametrize the responses of the internal degrees of freedoms to a monochromatic photon probe. In this work, the inelastic channel is treated in EFT, with a focus on the kinematic region of the neutron quasi-free peak, where the momentum of the outgoing proton is small enough that it is considered to remain at rest. This provides access to the Compton scattering process , from which the scalar polarizabilites of the neutron, and , are extracted. Using EFT, triple differential cross-sections in the photon energy range of 200-to-400 MeV are computed. The biggest contribution comes from the impulse approximation, with small corrections stemming from final state interactions, meson exchange currents and rescattering. In this presentation, we report progress and preliminary results.

    nucl-th2 citations
  4. 04

    Mass and width of the resonance using complex-mass renormalization

    T. Bauer🇩🇪 · Y. Unal🇩🇪 · A. Kucukarslan🇹🇷 · S. Scherer🇩🇪

    We discuss the pole mass and the width of the resonance to third order in chiral effective field theory. In our calculation we choose the complex-mass renormalization scheme (CMS) and show that the CMS provides a consistent power-counting scheme. In terms of the pion-mass dependence, we compare the convergence behavior of the CMS with the small-scale expansion (SSE).

    nucl-thhep-lathep-phPRC(2017)·2 citations
  5. 05

    Electric Properties of One-Neutron Halo Nuclei in Halo EFT

    Jonas Braun🇩🇪 · Hans-Werner Hammer🇩🇪

    We exploit the separation of scales in weakly-bound nuclei to compute E2 transitions and electric form factors in a Halo EFT framework. The relevant degrees of freedom are the core and the halo neutron. The EFT expansion is carried out in powers of , where and denote the length scales of the core and halo, respectively. We include the strong -wave and -wave interactions by introducing dimer fields. The dimer propagators are regulated by employing the power divergence subtraction scheme and matched to the effective range expansion in the respective channel.Electromagnetic interactions are included via minimal substitution in the Lagrangian. We demonstrate that, depending on the observable and respective partial wave, additional local gauge-invariant operators contribute in LO, NLO and higher orders.

    nucl-thFew Body Syst.(2017)·3 citations
  6. 06

    Implications of Missing Resonances in Heavy Ions Collisions

    Jacquelyn Noronha-Hostler🇺🇸

    Between 2004 until today many new resonances in the QCD spectrum have been added by the Particle Data Group. However, it is still possible that there are further states that have yet to be measured, as predicted by Lattice QCD calculations and Quark Models. In this paper I review how these missing states would influence the field of heavy-ion collisions. Additionally, the quantum numbers that characterize these missing states are also discussed.

    nucl-thhep-phnucl-ex5 citations

Affiliations

first authorsco-authorsvia INSPIRE