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Nuclear Theory·nucl-th

Thursday·April 22, 2021

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 01

    Investigations on mixed harmonic cumulants in heavy-ion collisions at the LHC

    Ming Li🇨🇳 · You Zhou🇩🇰 · Wenbin Zhao🇨🇳 · Baochi Fu🇨🇳 · Yawen Mou🇨🇳 · Huichao Song🇨🇳

    A series of new flow observables mixed harmonic multi-particle cumulants (MHC), which allow for the first time to quantify the correlations strength between different order of flow coefficients with various moments, was investigated using hydrodynamic model. These new observables are constructed based on multi-particle cumulants, and thus by design will be less sensitive to the non-flow contaminations. In addition to the previous study of correlation involving two flow coefficients with their second moments, both correlations of three flow coefficients and the correlations of higher order moments of and are systematically investigated using iEBE-VISHNU hybrid model with two different initial conditions, AMPT and TRENTo, respectively. These systematic studies using hydrodynamic models will significantly improve the understanding on the correlations between different orders (and moments) of flow coefficients. The hydrodynamic predictions shown in this paper and the future comparisons to experimental measurements will provide more constraints on theoretical models and extract more information about the transport properties of the quark-gluon plasma created in heavy-ion collisions.

    nucl-thhep-phnucl-exPRC(2021)·12 citations
  2. 02

    Detailed study of decay properties of 7He nucleus states in ab initio approach

    D. M. Rodkin🇷🇺 · Yu. M. Tchuvil'sky🇷🇺

    The energies and decay widths of the states of the exotic 7He nucleus are studied in an ab initio approach. The spectrum of these states is calculated using No-Core Shell Model and corresponding extrapolation procedure. Well-proven on a large amount of data the Daejeon16 potential is used in the calculations. The previously developed NCSM-based approach, which includes a method for constructing the basis of orthogonalized functions of cluster channels and a procedure for matching the cluster form factors obtained within this method with the corresponding asymptotic wave functions, is applied to compute the decay widths of the levels. The possibilities of the approach for calculating the partial decay widths of nuclear states into various channels strongly differing in type of fragmentation, spin, angular momentum of relative motion, and amplitude are demonstrated. The results obtained are compared with the results of other microscopic calculations.

    nucl-thPRC(2021)·17 citations
  3. 03

    An Exact Integral-to-Sum Relation for Products of Bessel Functions

    Oliver H. E. Philcox🇺🇸 · Zachary Slepian🇺🇸

    A useful identity relating the infinite sum of two Bessel functions to their infinite integral was discovered in Dominici et al. (2012). Here, we extend this result to products of Bessel functions, and show it can be straightforwardly proven using the Abel-Plana theorem, or the Poisson summation formula. For , the proof is much simpler than that of Dominici et al., and significantly enlarges the range of validity.

    ↳ math.CAastro-ph.COhep-thmath-ph+2Proc.Roy.Soc.Lond.A(2021)·4 citations
  4. 04

    Semileptonic transitions

    Zhao-Qian Yao🇨🇳 · Daniele Binosi🇮🇹 · Zhu-Fang Cui🇨🇳 · Craig D. Roberts🇨🇳

    Using a systematic, symmetry-preserving continuum approach to the Standard Model strong-interaction bound-state problem, we deliver parameter-free predictions for all semileptonic transition form factors on the complete domains of empirically accessible momentum transfers. Working with branching fractions calculated therefrom, the following values of the ratios for over final states are obtained: and . Combined with other recent results, our analysis confirms a discrepancy between the Standard Model prediction for and the single available experimental result.

    ↳ hep-phhep-exhep-latnucl-ex+1PLB(2021)·25 citations
  5. 05

    The axion-baryon coupling in SU(3) heavy baryon chiral perturbation theory

    Thomas Vonk🇩🇪 · Feng-Kun Guo🇨🇳 · Ulf-G. Meißner🇩🇪

    In the past, the axion-nucleon coupling has been calculated in the framework of SU(2) heavy baryon chiral perturbation theory up to third order in the chiral power counting. Here, we extend these earlier studies to the case of heavy baryon chiral perturbation theory with SU(3) flavor symmetry and derive the axion coupling to the full SU(3) baryon octet, showing that the axion also significantly couples to hyperons. As studies on dense nuclear matter suggest the possible existence of hyperons in stellar objects such as neutron stars, our results should have phenomenological implications related to the so-called axion window.

    ↳ hep-phhep-lathep-thnucl-thJHEP(2021)·25 citations
  6. 06

    The SuSA model for neutrino oscillation experiments: from quasielastic scattering to the resonance region

    Maria B. Barbaro🇮🇹 · Arturo De Pace🇮🇹 · Luisa Fiume🇮🇹

    High precision studies of Beyond-Standard-Model physics through accelerator-based neutrino oscillation experiments require a very accurate description of neutrino-nucleus cross sections in a broad energy region, going from quasielastic scattering up to deep inelastic scattering. In this work we focus on the following processes: quasielastic scattering, two-particle-two-hole excitations, and the excitation of the first (Delta) and second (Roper) resonances of the nucleon. The nuclear model is fully relativistic and includes both one- and two-body currents. We compare our results with recent T2K and MicroBooNE data on carbon and argon targets, and present predictions for DUNE kinematics.

    ↳ hep-phhep-exnucl-exnucl-thUniverse(2021)·15 citations

Affiliations

first authorsco-authorsvia INSPIRE