Nuclear Theory·nucl-th

Tuesday·May 25, 2021

10 papers—5 primary·5 cross-listed

06
Delineating chiral separation effect in two-color dense QCD
Daiki Suenaga🇯🇵 · Toru Kojo🇨🇳
We study the chiral separation effect (CSE) in two-color and two-flavor QCD (QC $_{2}$ D) to delineate quasiparticle pictures in dense matter from low to high temperatures. Both massless and massive quarks are discussed. We particularly focus on the high density domain where diquarks form a color singlet condensate with the electric charge $1/3$ . The condensate breaks baryon number and $U (1)_{A}$ axial symmetry, and induces the electromagnetic Meissner effects. Within a quark quasiparticle picture, we compute the chiral separation conductivity at one-loop. We have checked that Nambu-Goldstone modes, which should appear in the improved vertices as required by the Ward-Takahashi identities, do not contribute to the chiral separation conductivity due to their longitudinal natures. In the static limit, the destructive interferences in the particle-hole channel, as in usual Meissner effects, suppress the conductivity (in chiral limit, to $1/3$ of the normal phase's). This locally breaks the universality of the CSE coefficients, provided quasiparticle pictures are valid in the bulk matter.
↳ hep-phhep-latnucl-thPRD(2021)·9 citations
07
Isotope Shifts of Radium Monofluoride Molecules
S.M. Udrescu🇺🇸 · A.J. Brinson🇺🇸 · R.F. Garcia Ruiz🇺🇸 · K. Gaul🇩🇪 · R. Berger🇩🇪 · J. Billowes🇬🇧 · C.L. Binnersley🇬🇧 · M.L. Bissell🇬🇧 · A.A. Breier🇩🇪 · K. Chrysalidis🇨🇭 · T.E. Cocolios🇧🇪 · B.S. Cooper🇬🇧 and 16 other authors
Isotope shifts of $^{223 - 226, 228}$ Ra $^{19}$ F were measured for different vibrational levels in the electronic transition $A^{2} Π_{1/2} \leftarrow X^{2} Σ^{+}$ . The observed isotope shifts demonstrate the particularly high sensitivity of radium monofluoride to nuclear size effects, offering a stringent test of models describing the electronic density within the radium nucleus. Ab initio quantum chemical calculations are in excellent agreement with experimental observations. These results highlight some of the unique opportunities that short-lived molecules could offer in nuclear structure and in fundamental symmetry studies.
↳ nucl-exnucl-thphysics.atom-phPRL(2021)·44 citations
08
Complex Langevin study for polarons in an attractively interacting one-dimensional two-component Fermi gas
Takahiro M. Doi🇯🇵 · Hiroyuki Tajima🇯🇵 · Shoichiro Tsutsui🇯🇵
We investigate a polaronic excitation in a one-dimensional spin-1/2 Fermi gas with contact attractive interactions, using the complex Langevin method, which is a promising approach to evade a possible sign problem in quantum Monte Carlo simulations. We found that the complex Langevin method works correctly in a wide range of temperature, interaction strength, and population imbalance. The Fermi polaron energy extracted from the two-point imaginary Green's function is not sensitive to the temperature and the impurity concentration in the parameter region we considered. Our results show a good agreement with the solution of the thermodynamic Bethe ansatz at zero temperature.
↳ cond-mat.quant-gascond-mat.str-elcond-mat.supr-conhep-lat+1PRResearch(2021)·7 citations
09
Transport Synthetic Acceleration for the Solution of the One-Speed Nonclassical Spectral S $_{N}$ Equations in Slab Geometry
Japan K. Patel · Leonardo R. C. Moraes · Richard Vasques · Ricardo C. Barros
The nonclassical transport equation models particle transport processes in which the particle flux does not decrease as an exponential function of the particle's free-path. Recently, a spectral approach was developed to generate nonclassical spectral S $_{N}$ equations, which can be numerically solved in a deterministic fashion using classical numerical techniques. This paper introduces a transport synthetic acceleration procedure to speed up the iteration scheme for the solution of the monoenergetic slab-geometry nonclassical spectral S $_{N}$ equations. We present numerical results that confirm the benefit of the acceleration procedure for this class of problems.
↳ math-phmath.MPnucl-thJ.Comput.Appl.Math.(2022)·0 citations
10
Centrality and transverse momentum dependence of hadrons in Pb+Pb collisions at LHC
Lilin Zhu🇨🇳 · Hua Zheng🇨🇳 · Rudolph C. Hwa🇺🇸
The transverse momentum spectra of seven identified hadrons produced in Pb+Pb collisions at $s_{N N} = 2.76$ and 5.02 TeV at the CERN Large Hadron Collider (LHC) have been investigated in the framework of the recombination model (RM). Soft, semihard and hard partons all play important roles in our model and are uniformly treated for all hadrons produced.The investigation has been extended to non-central collisions and the parameters controlling the momentum degradation of semihard partons have been tuned. Our study shows good agreement between theoretical results and experimental data. To be able to provide a coherent explanation for the production of all identified hadrons ( $π$ , p, K, $Λ$ , $ϕ$ , $Ξ$ , $Ω$ ) for transverse momenta as high as 14 GeV/c (for $π$ , p and K), and for all centralities, is an unprecedented achievement that supports the RM as a sensible model to combine various mechanisms of parton production with a universal scheme of hadronization.
↳ hep-phnucl-thPRC(2021)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE

Delineating chiral separation effect in two-color dense QCD

Isotope Shifts of Radium Monofluoride Molecules

Complex Langevin study for polarons in an attractively interacting one-dimensional two-component Fermi gas

Transport Synthetic Acceleration for the Solution of the One-Speed Nonclassical Spectral SN​ Equations in Slab Geometry

Centrality and transverse momentum dependence of hadrons in Pb+Pb collisions at LHC

Affiliations

Transport Synthetic Acceleration for the Solution of the One-Speed Nonclassical Spectral S $_{N}$ Equations in Slab Geometry