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Nuclear Theory·nucl-th

Tuesday·March 3, 2020

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 06

    Hadron Physics at J-PARC

    Hiroaki Ohnishi🇯🇵 · Fuminori Sakuma🇯🇵 · Toshiyuki Takahashi🇯🇵

    The aim of the hadron physics research programs conducted at J-PARC is to explore the structure of hadronic matter using the world's highest-intensity meson beams. Since the first beam was extracted at the hadron experimental facility (HEF) in February 2009, a wide variety of physics experiments have been proposed and performed to address open questions regarding quantum chromodynamics (QCD) at low energy. The high-intensity and high-momentum beams available at J-PARC open a new era in hadron and nuclear physics, in which strange and charm quarks play an important role. We review the programs focused on addressing the hadron structure as strongly interacting composite particles, the origin of hadron mass, and interactions between hadrons under broken flavor SU(3) symmetry.

    ↳ nucl-exnucl-thPPNP(2020)·43 citations
  3. 08

    Superfluid-Normal Quantum Phase Transitions in an Imbalanced Fermi Gas

    Heron Caldas🇧🇷

    We investigate the superfluid-to-normal zero temperature quantum phase transitions of asymmetric two-component Fermi gases as a function of the chemical potential imbalance . The calculations are performed for homogeneous and trapped imbalanced systems. We concentrate at unitarity, characterized by a divergent interaction parameter , where most of the current experiments are realized. For homogeneous systems, we determine the critical chemical potential imbalance at which possible phase transitions occur. In the case of trapped gases, we show how can be consistently determined from experimental observations.

    ↳ cond-mat.quant-gascond-mat.supr-conhep-thnucl-thJ.Phys.B(2020)·1 citation
  4. 09

    Analysis of Bose-Einstein correlation at 7 TeV by LHCb collaboration based on stochastic approach

    Takuya Mizoguchi🇯🇵 · Minoru Biyajima🇯🇵

    The Bose-Einstein correlation (BEC) in forward region () measured at 7 TeV in the Large Hadron Collider (LHC) by the LHCb collaboration is analyzed using two conventional formulas of different types named CF and CF. The first formula is well known and contains the degree of coherence () and the exchange function from the BE statistics. The second formula is an extended formula (CF) that contains the second degree of coherence and the second exchange function in addition to CF. To examine the physical meaning of the parameters estimated by CF, we analyze the LHCb BEC data by using a stochastic approach of the three-negative binomial distribution and the three-generalized Glauber-Lachs formula. Our results reveal that the BEC at 7 TeV consisted of three activity intervals defined by the multiplicity ([8, 18], [19, 35], and [36, 96]) can be well explained by CF.

    ↳ hep-phhep-exnucl-thInt.J.Mod.Phys.A(2020)·4 citations
  5. 10

    Analytical determination of the structure and nuclear abundances of the outer crust of a cold nonaccreted neutron star

    Nicolas Chamel

    A very fast iterative method is presented to calculate the internal constitution of the outer crust of a cold nonaccreted neutron star, making use of very accurate analytical formulas for the transition pressures between adjacent crustal layers and their density. In addition to the composition of the different crustal layers, their depth and their baryonic mass content can be simultaneously estimated using an approximate solution of Einstein's general relativistic equations. The overall computing time is drastically reduced compared to the traditional approach, thus opening the door to large-scale statistical studies and sensitivity analyses.

    ↳ astro-ph.HEnucl-thPRC(2020)·23 citations
  6. 11

    Constraints on charm-anticharm asymmetry in the nucleon from lattice QCD

    Raza Sabbir Sufian🇺🇸 · Tianbo Liu🇺🇸 · Andrei Alexandru🇺🇸 · Stanley J. Brodsky🇺🇸 · Guy F. de Téramond🇨🇷 · Hans Günter Dosch🇩🇪 · Terrence Draper🇺🇸 · Keh-Fei Liu🇺🇸 · Yi-Bo Yang🇨🇳

    We present the first lattice QCD calculation of the charm quark contribution to the nucleon electromagnetic form factors in the momentum transfer range . The quark mass dependence, finite lattice spacing and volume corrections are taken into account simultaneously based on the calculation on three gauge ensembles including one at the physical pion mass. The nonzero value of the charm magnetic moment , as well as the Pauli form factor, reflects a nontrivial role of the charm sea in the nucleon spin structure. The nonzero indicates the existence of a nonvanishing asymmetric charm-anticharm sea in the nucleon. Performing a nonperturbative analysis based on holographic QCD and the generalized Veneziano model, we study the constraints on the distribution from the lattice QCD results presented here. Our results provide complementary information and motivation for more detailed studies of physical observables that are sensitive to intrinsic charm and for future global analyses of parton distributions including asymmetric charm-anticharm distribution.

    ↳ hep-lathep-exhep-phnucl-thPLB(2020)·52 citations

Affiliations

first authorsco-authorsvia INSPIRE