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Nuclear Theory·nucl-th

Monday·October 1, 2018

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    Cracking the difference of estimating heavy quark transport coefficients in a Quark-Gluon Plasma

    Yingru Xu🇺🇸 · Steffen A. Bass🇺🇸 · Pierre Moreau🇩🇪 · Taesoo Song🇩🇪 · Marlene Nahrgang🇫🇷 · Elena Bratkovskaya🇩🇪 · Pol Gossiaux🇫🇷 · Jorg Aichelin🇫🇷 · Shanshan Cao🇺🇸 · Vincenzo Greco🇮🇹 · Gabriele Coci🇮🇹 · Klaus Werner🇫🇷

    Heavy flavor observables provide valuable information on the properties of the hot and dense Quark-Gluon Plasma (QGP) created in ultra-relativistic nucleus-nucleus collisions. Various microscopic models have successfully described many of the observables associated with its formation. Their transport coefficients differ, however, due to different assumptions about the underlying interaction of the heavy quarks with the plasma constituents, different initial geometries and formation times, different hadronization processes and a different time evolution of the QGP. In this study we present the transport coefficients of all these models and investigate systematically how some of these assumptions influence the heavy quark properties at the end of the QGP expansion. For this purpose we impose on these models the same initial condition and the same model for the QGP expansion and show that both have considerable influence on and .

    nucl-thPRC(2019)·75 citations
  2. 02

    Parity-Violating Three Nucleon Interactions at Low Energies and Large-

    Jared Vanasse🇺🇸

    The parity-violating (PV) nucleon-nucleon () interaction in the three-nucleon system is investigated using pionless effective field theory (). This work shows that a next-to-leading order (NLO) PV three-body force is necessary in contradiction with a previous claim [Griesshammer and Schindler in Eur. Phys. J. A 46, 73 (2010)]. Including three-body to -wave transitions PV three-nucleon observables are calculated to higher energies than previously considered. Using the recent large- analysis of the PV interaction in the current understanding of low energy PV few-body measurements is reassessed. The recent measurement of the asymmetry in from the NPDGamma collaboration [D. Blyth et al. (NPDGamma), Phys. Rev. Lett. 121, 242002 (2018)], gives the value for a next-to-next-to-leading order (NLO) in large- low energy constant (LEC). Using the large- hierarchy of LECs the sizes of the leading order (LO) in large- LECs are estimated using an experimental bound on a parity violating asymmetry in scattering at MeV and a measurement of scattering at MeV. Comparing the size of the resulting LO in large- LECs to the NLO in large- LEC shows they are roughly the same size in contradiction with current large- counting.

    nucl-thPRC(2019)·10 citations
  3. 03

    Impact of the ionization of the atomic shell on the lifetime of the 229mTh isomer

    F. F. Karpeshin · M.B.Trzhaskovskaya

    Recent experimental data are analyzed, concerning the half-lives of the 229mTh isomer in neutral atoms and various ions. Calculation is performed on the united platform of interplay of traditional and subthreshold resonance conversion. General agreement with experiment is obtained in the cases of Th I and Th III, a prediction is made concerning half-life in Th IV. Most critical is the case of Th II, where experimental data can be explained by interplay of various factors. A new physics is proposed, based on dependence of the nuclear lifetime on the ambient conditions, such as atmospheric pressure. This must be taken into account in future experiments and their interpretation.

    nucl-thNPA(2018)·12 citations
  4. 04

    Fast resonance decays in nuclear collisions

    Aleksas Mazeliauskas🇩🇪 · Stefan Floerchinger🇩🇪 · Eduardo Grossi🇩🇪 · Derek Teaney🇺🇸

    In the context of ultra-relativistic nuclear collisions, we present a fast method for calculating the final particle spectra after the direct decay of resonances from a Cooper-Frye integral over the freeze-out surface. The method is based on identifying components of the final particle spectrum that transform in an irreducible way under rotations in the fluid-restframe. Corresponding distribution functions can be pre-computed including all resonance decays. Just a few of easily tabulated scalar functions then determine the Lorentz invariant decay spectrum from each space-time point, and simple integrals of these scalar functions over the freeze-out surface determine the final decay products. This by-passes numerically costly event-by-event calculations of the intermediate resonances. The method is of considerable practical use for making realistic data to model comparisons of the identified particle yields and flow harmonics, and for studying the viscous corrections to the freeze-out distribution function.

    nucl-thhep-phEPJC(2019)·48 citations

Affiliations

first authorsco-authorsvia INSPIRE