Nuclear Theory·nucl-th

Thursday·April 5, 2018

9 papers—4 primary·5 cross-listed

05
Fine structure of the cross sections of $e^{+} e^{-}$ annihilation near the thresholds of $p p ˉ$ and $n n ˉ$ production
A.I. Milstein🇷🇺 · S.G. Salnikov🇷🇺
The energy dependence of the cross sections of $p p ˉ$ , $n n ˉ$ , and meson production in $e^{+} e^{-}$ annihilation in the vicinity of the $p p ˉ$ and $n n ˉ$ thresholds is studied. The proton-neutron mass difference and the $p p ˉ$ Coulomb interaction are taken into account. The values of the cross sections are very sensitive to the parameters of the optical potential. It is shown that the commonly accepted factorization approach for the account of the Coulomb interaction does not work well enough in the vicinity of the threshold due to the finite size of the optical potential well.
↳ hep-phnucl-thNPA(2018)·25 citations
06
Model independent radiative corrections to elastic deuteron-electron scattering
G.I. Gakh · M.I. Konchatnij · N.P. Merenkov · E. Tomasi-Gustafsson
The differential cross section for elastic scattering of deuterons on electrons at rest is calculated taking into account the QED radiative corrections to the leptonic part of interaction. These model-independent radiative corrections arise due to emission of the virtual and real soft and hard photons as well as to vacuum polarization. We consider an experimental setup where both final particles are recorded in coincidence and their energies are determined within some uncertainties. The kinematics, the cross section, and the radiative corrections are calculated and numerical results are presented.
↳ hep-phnucl-thPRC(2018)·9 citations
07
Dark Matter Effects On Neutron Star Properties
John Ellis🇪🇪 · Gert Hütsi🇪🇪 · Kristjan Kannike🇪🇪 · Luca Marzola🇪🇪 · Martti Raidal🇪🇪 · Ville Vaskonen🇪🇪
We study possible effects of a dark matter (DM) core on the maximum mass of a neutron star (NS), on the mass-radius relation and on the NS tidal deformability parameter $Λ$ . We show that all these quantities would in general be reduced in the presence of a DM core. In particular, our calculations indicate that the presence of a DM core with a mass fraction $\sim 5%$ could affect significantly the interpretation of these NS data as constraints on the nuclear equation of state (EOS), potentially excluding some EOS models on the basis of the measured mass of PSR J0348+0432, while allowing other EOS models to become consistent with the LIGO/Virgo upper limit on $Λ$ . Specific scenarios for generating such DM cores are explored in an Appendix.
↳ astro-ph.COhep-phnucl-thPRD(2018)·226 citations
08
First direct lattice-QCD calculation of the $x$ -dependence of the pion parton distribution function
Jian-Hui Zhang🇩🇪 · Jiunn-Wei Chen🇹🇼 · Luchang Jin🇺🇸 · Huey-Wen Lin🇺🇸 · Andreas Schäfer🇩🇪 · Yong Zhao🇺🇸
We present the first direct lattice-QCD calculation of the Bjorken- $x$ dependence of the valence quark distribution of the pion. Using large-momentum effective theory (LaMET), we calculate the boosted pion state with long Wilson link operators. After implementing the one-loop matching and meson mass corrections, our result at $m_{π} \approx 310$ MeV is in agreement with those extracted from experimental data as well as from Dyson-Schwinger equation in small $x$ region, but a sizeable discrepancy in the large $x$ region. This discrepancy provides a nice opportunity to systematically study and disentangle the artifacts in the LaMET approach, which will eventually help to discern various existing analyses in the literature.
↳ hep-lathep-exhep-phnucl-ex+1PRD(2019)·170 citations
09
Linear Response on a Quantum Computer
Alessandro Roggero🇺🇸 · Joseph Carlson🇺🇸
The dynamic linear response of a quantum system is critical for understanding both the structure and dynamics of strongly-interacting quantum systems, including neutron scattering from materials, photon and electron scattering from atomic systems, and electron and neutrino scattering by nuclei. We present a general algorithm for quantum computers to calculate the dynamic linear response function with controlled errors and to obtain information about specific final states that can be directly compared to experimental observations.
↳ quant-phnucl-thPRC(2019)·128 citations

Affiliations

first authorsco-authorsvia INSPIRE

Fine structure of the cross sections of e+e− annihilation near the thresholds of ppˉ​ and nnˉ production

Model independent radiative corrections to elastic deuteron-electron scattering

Dark Matter Effects On Neutron Star Properties

First direct lattice-QCD calculation of the x-dependence of the pion parton distribution function

Linear Response on a Quantum Computer

Affiliations

Fine structure of the cross sections of $e^{+} e^{-}$ annihilation near the thresholds of $p p ˉ$ and $n n ˉ$ production

First direct lattice-QCD calculation of the $x$ -dependence of the pion parton distribution function