Nuclear Theory·nucl-th

Monday·January 23, 2017

6 papers—2 primary·4 cross-listed

03
Effect of nuclear saturation parameters on possible maximum mass of neutron stars
Hajime Sotani🇯🇵
In order to systematically examine the possible maximum mass of neutron stars, which is one of the important properties characterizing the physics in high-density region, I construct neutron star models by adopting phenomenological equations of state with various values of nuclear saturation parameters for low-density region, which are connected to the equation of state for high-density region characterized by the possible maximum sound velocity in medium. I derive an empirical formula for the possible maximum mass of neutron star. If massive neutron stars are observed, it could be possible to get a constraint on the possible maximum sound velocity for high-density region.
↳ astro-ph.HEnucl-thPRC(2017)·19 citations
04
Interaction of real and virtual $p p ˉ$ pairs in $J / ψ \to p p ˉ γ (ρ, ω)$ decays
A. I. Milstein🇷🇺 · S. G. Salnikov🇷🇺
The $p p ˉ$ invariant mass spectra of the processes $J / ψ \to p p ˉ ω$ , $J / ψ \to p p ˉ ρ$ , and $J / ψ \to p p ˉ γ$ close to the $p p ˉ$ threshold are calculated by means of the $N N ˉ$ optical potential. The potential model for $N N ˉ$ interaction in the $^{1} S_{0}$ state is proposed. The parameters of the model are obtained by fitting the cross section of $N N ˉ$ scattering together with the $p p ˉ$ invariant mass spectra of the $J / ψ$ decays. Good agreement with the available experimental data is achieved. Using our potential and the Green's function approach we also describe the peak in the $η^{'} π^{+} π^{-}$ invariant mass spectrum in the decay $J / ψ \to γ η^{'} π^{+} π^{-}$ in the energy region near the $N N ˉ$ threshold.
↳ hep-phnucl-thNPA(2017)·18 citations
05
Inclusive production of small radius jets in heavy-ion collisions
Zhong-Bo Kang🇺🇸 · Felix Ringer🇺🇸 · Ivan Vitev🇺🇸
We develop a new formalism to describe the inclusive production of small radius jets in heavy-ion collisions, which is consistent with jet calculations in the simpler proton-proton system. Only at next-to-leading order (NLO) and beyond, the jet radius parameter $R$ and the jet algorithm dependence of the jet cross section can be studied and a meaningful comparison to experimental measurements is possible. We are able to consistently achieve NLO accuracy by making use of the recently developed semi-inclusive jet functions within Soft Collinear Effective Theory (SCET). In addition, single logarithms of the jet size parameter $α_{s}^{n} ln^{n} R$ are resummed to next-to-leading logarithmic (NLL $_{R}$ ) accuracy. The medium modified semi-inclusive jet functions are obtained within the framework of SCET with Glauber gluons that describe the interaction of jets with the medium. We present numerical results for the suppression of inclusive jet cross sections in heavy ion collisions at the LHC and the formalism developed here can be extended directly to corresponding jet substructure observables.
↳ hep-phnucl-thPLB(2017)·78 citations
06
Transverse densities of octet baryons from chiral effective field theory
Jose Manuel Alarcón🇺🇸 · Astrid N. Hiller Blin🇪🇸 · C. Weiss🇺🇸
Transverse densities describe the distribution of charge and current at fixed light-front time and provide a frame-independent spatial representation of hadrons as relativistic systems. We calculate the transverse densities of the octet baryons at peripheral distances b = O(M_pi^{-1}) in an approach combining chiral effective field theory (ChEFT) and dispersion analysis. The densities are represented as dispersive integrals of the imaginary parts of the baryon electromagnetic form factors in the timelike region (spectral functions). The spectral functions on the two-pion cut at t > 4 M_pi^2 are computed using relativistic ChEFT with octet and decuplet baryons in the EOMS renormalization scheme. The calculations are extended into the rho-meson mass region, using a dispersive method that incorporates the timelike pion form-factor data. The approach allows us to construct densities at distances b > 1 fm with controlled uncertainties. Our results provide insight into the peripheral structure of nucleons and hyperons and can be compared with empirical densities and lattice-QCD calculations.
↳ hep-phnucl-thFew Body Syst.(2017)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE

Effect of nuclear saturation parameters on possible maximum mass of neutron stars

Interaction of real and virtual ppˉ​ pairs in J/ψ→ppˉ​γ(ρ,ω) decays

Inclusive production of small radius jets in heavy-ion collisions

Transverse densities of octet baryons from chiral effective field theory

Affiliations

Interaction of real and virtual $p p ˉ$ pairs in $J / ψ \to p p ˉ γ (ρ, ω)$ decays