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Nuclear Theory·nucl-th

Thursday·October 18, 2018

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 01

    [Submitted on 16 Oct 2018]

    Partial correlation analysis in ultra-relativistic nuclear collisions

    Wojciech Broniowski🇵🇱 · Adam Olszewski🇵🇱

    We show that the method of partial covariance is a very efficient way to introduce constraints (such as the centrality selection) in data analysis in ultra-relativistic nuclear collisions. The technique eliminates spurious event-by-event fluctuations of physical quantities due to fluctuations of control variables. Moreover, in the commonly used superposition approach to particle production the method can be used to impose constraints on the initial sources rather than on the finally produced particles, thus separating out the trivial fluctuations from statistical hadronization or emission from sources and focusing strictly on the initial-state physics. As illustration, we use simulated data from hydrodynamics started on the wounded-quark event-by-event initial conditions, followed with statistical hadronization, to show the practicality of the approach in analyzing the forward-backward multiplicity fluctuations. We mention generalizations to the case with several constraints and other observables, such as the transverse momentum or eccentricity correlations.

    Comments:
    6 pages, 2 figures, talk presented by WB at XIII Workshop on Particle Correlations and Femtoscopy (WPCF~2018), Cracow, Poland, 22-26 May 2018
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1810.07249 [pdf]
    0 citations
  2. 02

    [Submitted on 17 Oct 2018]

    3H and 3He calculations without angular momentum decomposition

    K. Topolnicki🇵🇱

    Results for the three nucleon (3N) bound state carried out using the "three dimensional" (3D) formalism are presented. In this approach calculations are performed without the use of angular momentum decomposition and instead rely directly on the 3D degrees of freedom of the nucleons. In this paper, for the first time, 3D results for He bound state with the inclusion of the screened Coulomb potential are compared to H calculations. Additionally, using these results, matrix elements of simple current operators related to the description of beta decay of the triton are given. All computations are carried out using the first generation of NNLO two nucleon (2N) and 3N forces from the Bochum - Bonn group.

    Comments:
    33 pages, 11 pdf figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1810.07436 [pdf]
    PRC(2019)·1 citation
  3. 03

    [Submitted on 17 Oct 2018]

    Gogny forces in the astrophysical context

    X. Viñas🇪🇸 · C. Gonzalez-Boquera🇪🇸 · M. Centelles🇪🇸 · L.M. Robledo🇪🇸 · C. Mondal🇪🇸

    The most successful Gogny interactions of the D1 family, namely D1S, D1N and D1M, suffer the common problem of a too soft neutron matter equation of state at high density, which prevents them from predicting a maximal mass of neutron stars of two solar masses, as required by recent astronomical observations. To cure this deficiency, we have proposed recently a reparametrization of the D1M force by fine tuning the slope of the symmetry energy in such a way that it preserves the ground-state properties of D1M in finite nuclei and also describes successfully the global properties of neutron stars, in particular its maximal mass, in consonance with the observational data. In this contribution we revisit this reparametrization by discussing two modified Gogny forces, dubbed D1M and D1M.

    Comments:
    8 pages, 3 figures, 2 tables Proceedings for 37 International Workshop on Nuclear Theory, Rila Mountains (Bulgaria) June 2018
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1810.07469 [pdf]
    Nucl.Theor.(2018)·6 citations
  4. 04

    [Submitted on 17 Oct 2018]

    The pressure distribution and shear forces inside the proton

    P. E. Shanahan🇺🇸 · W. Detmold🇺🇸

    The distributions of pressure and shear forces inside the proton are investigated using lattice Quantum Chromodynamics (LQCD) calculations of the energy momentum tensor, allowing the first model-independent determination of these fundamental aspects of proton structure. This is achieved by combining recent LQCD results for the gluon contributions to the energy momentum tensor with earlier calculations of the quark contributions. The utility of LQCD calculations in exploring, and supplementing, the assumptions in a recent extraction of the pressure distribution in the proton from deeply virtual Compton scattering experiments is also discussed. Based on this study, the target kinematics for experiments aiming to determine the pressure and shear distributions with greater precision at Thomas Jefferson National Accelerator Facility and a future Electron Ion Collider are investigated.

    Comments:
    Units corrected on figure axes
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1810.07589 [pdf]
    PRL(2019)·154 citations
  5. 05

    [Submitted on 17 Oct 2018]

    Neutrino-nucleus cross section within the extended factorization scheme

    Noemi Rocco🇬🇧 · Carlo Barbieri🇬🇧 · Omar Benhar🇮🇹 · Arturo De Pace🇮🇹 · Alessandro Lovato🇺🇸

    The factorization scheme, based on the impulse approximation and the spectral function formalism, has been recently generalized to allow the description of electromagnetic nuclear interactions driven by two-nucleon currents. We have extended this framework to the case of weak charged and neutral currents and carried out calculations of the double-differential neutrino-carbon and neutrino-oxygen cross sections using two different models of the target spectral functions. The results, showing a moderate dependence on the input spectral function, confirm that our approach provides a consistent treatment of all reaction mechanisms contributing to the signals detected by accelerator-based neutrino experiments.

    Comments:
    18 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex)
    arXiv:
    1810.07647 [pdf]
    PRC(2019)·74 citations

Affiliations

first authorsco-authorsvia INSPIRE