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Nuclear Theory·nucl-th

Friday·February 15, 2019

11 papers—6 primary·5 cross-listed

All11Primary6Cross-lists5
  1. 07

    Diffractive Dijet Production and Wigner Distributions from the Color Glass Condensate

    Heikki Mäntysaari🇫🇮 · Niklas Mueller🇺🇸 · Björn Schenke🇺🇸

    Experimental processes that are sensitive to parton Wigner distributions provide a powerful tool to advance our understanding of proton structure. In this work, we compute gluon Wigner and Husimi distributions of protons within the Color Glass Condensate framework, which includes a spatially dependent McLerran-Venugopalan initial configuration and the explicit numerical solution of the JIMWLK equations. We determine the leading anisotropy of the Wigner and Husimi distributions as a function of the angle between impact parameter and transverse momentum. We study experimental signatures of these angular correlations at a proposed Electron Ion Collider by computing coherent diffractive dijet production cross sections in e+p collisions within the same framework. Specifically, we predict the elliptic modulation of the cross section as a function of the relative angle between nucleon recoil and dijet transverse momentum for a wide kinematical range. We further predict its dependence on collision energy, which is dominated by the growth of the proton with decreasing .

    ↳ hep-phnucl-thPRD(2019)·90 citations
  2. 08

    Constraints on nuclear parton distributions from dijet photoproduction at the LHC

    V. Guzey (Jyvaskyla U., Helsinki U., St. Petersburg, INP)🇫🇮 · M. Klasen (Munster U., ITP)🇩🇪

    Using QCD calculations of the cross section of inclusive dijet photoproduction in Pb-Pb ultraperipheral collisions in the LHC kinematics as pseudo-data, we study the effect of including these data using the Bayesian reweighting technique on nCTEQ15, nCTEQ15np, and EPPS16 nuclear parton distribution functions (nPDFs). We find that, depending on the assumed error of the pseudo-data, it leads to a significant reduction of the nPDF uncertainties at small values of the momentum fraction . Taking the error to be 5\%, the uncertainty of nCTEQ15 and nCTEQ15np nPDFs reduces approximately by a factor of two at . At the same time, the reweighting effect on EPPS16 nPDFs is much smaller due to the higher value of the tolerance and a more flexible parametrization form.

    ↳ hep-phnucl-exnucl-thEPJC(2019)·29 citations
  3. 09

    Experimental nuclear astrophysics in Italy

    C. Broggini🇮🇹 · O. Straniero🇮🇹 · M.G.F. Taiuti🇮🇹 · G. de Angelis🇮🇹 · G. Benzoni🇮🇹 · G.E. Bruno🇮🇹 · S. Bufalino🇮🇹 · G. Cardella🇮🇹 · N. Colonna🇮🇹 · M. Contalbrigo🇮🇹 · G. Cosentino🇮🇹 · S. Cristallo🇮🇹 and 27 other authors

    Nuclear astrophysics, the union of nuclear physics and astronomy, went through an impressive expansion during the last twenty years. This could be achieved thanks to milestone improvements in astronomical observations, cross section measurements, powerful computer simulations and much refined stellar models. Italian groups are giving quite important contributions to every domain of nuclear astrophysics, sometimes being the leaders of worldwide unique experiments. In this paper we will discuss the astrophysical scenarios where nuclear astrophysics plays a key role and we will provide detailed descriptions of the present and future of the experiments on nuclear astrophysics which belong to the scientific programme of INFN (the National Institute for Nuclear Physics in Italy).

    ↳ nucl-exastro-ph.SRnucl-thRiv.Nuovo Cim.(2019)·18 citations
  4. 10

    First order dissipative hydrodynamics and viscous corrections to the entropy four-current from an effective covariant kinetic theory

    Samapan Bhadury🇮🇳 · Manu Kurian🇮🇳 · Vinod Chandra🇮🇳 · Amaresh Jaiswal🇮🇳

    The first order hydrodynamic evolution equations for the shear stress tensor, the bulk viscous pressure and the charge current have been studied for a system of quarks and gluons, with a non-vanishing quark chemical potential and finite quark mass. The first order transport coefficients have been obtained by solving an effective Boltzmann equation for the grand-canonical ensemble of quasiquarks and quasigluons. We adopted temperature dependent effective fugacity for the quasiparticles to encode the hot QCD medium effects. The non-trivial energy dispersion of the quasiparticles induces mean field contributions to the transport coefficients whose origin could be directly related to the realization of conservation laws from the effective kinetic theory. Both the QCD equation of state and chemical potential are seen to have a significant impact on the quark-gluon plasma evolution. The shear and bulk viscous corrections to the entropy-four current have been investigated in the framework of the effective kinetic theory. The effect of viscous corrections to the entropy density have been quantified in the case of one dimensional boost-invariant expansion of the system. Further, the first order viscous corrections to the time evolution of temperature along with the description of pressure anisotropy and Reynolds number of the system have been explored for the longitudinal boost-invariant expansion.volution of temperature along with the description of pressure anisotropy of the system have also been explored.

    ↳ hep-phhep-thnucl-thJ.Phys.G(2020)·24 citations
  5. 11

    Baryon-number violation by two units and the deuteron lifetime

    F. Oosterhof🇳🇱 · B. Long🇨🇳 · J. de Vries🇺🇸 · R. G. E. Timmermans🇳🇱 · U. van Kolck🇫🇷

    We calculate the lifetime of the deuteron with dimension-nine quark operators that violate baryon number by two units. We construct an effective field theory for interactions that give rise to neutron-antineutron (-) oscillations and dinucleon decay within a consistent power counting. We calculate the ratio of the deuteron lifetime to the square of the - oscillation time up to next-to-leading order. Our result, which is analytical and has a quantified uncertainty, is smaller by a factor than earlier estimates based on nuclear models, which impacts the indirect bound on he - oscillation time and future experiments. We discuss how combined measurements of - oscillations and deuteron decay can help to identify the sources of baryon-number violation.

    ↳ hep-phnucl-thPRL(2019)·42 citations

Affiliations

first authorsco-authorsvia INSPIRE