Thu·Jun 3, 2021Thursday·June 3, 2021

1. 01*

   Nuclear reaction measurements of 80.5 MeV/u 12C beam bombarding on C, W, Cu, Au, Pb targets

   Zhichao Gao · Xueying Zhang · Yongqin Ju · Liang Chen · Honglin Ge · Yanbin Zhang · Fei Ma · Hongbin Zhang · Guozhu Shi · Zhiqiang Chen · Rui Han · Guoyu Tian and 3 other authors

   To get the energy spectrum distribution and cross-sections of emitted light charged particles and explore the nuclear reaction, a experiment of 80.5 MeV/u 12C beam bombarding on C, W, Cu, Au, Pb targets has been carried out at Institute of Modern Physics, Chinese Academy of Science. 30, 60 and 120 degree relative to the incident beam have been detected using three sets of telescope detectors. The results indicate that there is a tendency that heavier targets have larger double differential cross-sections and the emitted fragments are more likely to go forward. Besides, the decrease of cross-sections of fragments producing with the increasing emitted angles may follow some kind of pattern.

   nucl-exNucl.Instrum.Meth.B(2022)·3 citations
2. 02*

   Electroproduction of heavy vector mesons using holographic QCD: from near threshold to high energy regimes

   Kiminad A. Mamo🇺🇸 · Ismail Zahed🇺🇸

   We develop a non-perturbative analysis of the electro-production of heavy vector mesons ($\varphi$, $J/\Psi$) from threshold to high energy. We use the holographic construction with bulk confinement enforced through a soft wall. Using Witten diagrams, we evaluate the pertinent cross sections for heavy vector mesons ($\varphi$, $J/\Psi$) production and study their dependence on both the incoming virtual photon polarization as well as the outgoing polarization of the heavy meson. Our results for $J/\Psi$ electro-production compares well with the available HERA data at low and intermediate $Q^2$, and for a wide range of momentum transfer. We also predict the quasi-real electro-production of $J/\Psi$ near threshold.

   ↳ hep-phhep-exhep-thnucl-ex+1PRD(2021)·25 citations
3. 03*

   Electromagnetic radii of the nucleon in soft-wall holographic QCD

   Kiminad A. Mamo🇺🇸 · Ismail Zahed🇺🇸

   We revisit the electromagnetic form factors of the proton and neutron in the original-minimal soft-wall holographic QCD, which has only two parameters, i.e., the mass scale $\kappa$ and the twist parameter of the nucleon $\tau$. We first fix $\tau =3$ by the hard scattering rule, and extract $\kappa =0.402\text{GeV}$ from the world data (including the Mainz A1 data) of the Sachs magnetic form factor of the proton $G_M^p$. We then predict among others, the charge radius of the proton to be ${\mathbf{r}}_{\mathbf{p}}=0.831\pm 0.008\text{fm}$, in perfect agreement with the recent charge radius of the proton measured by the PRad collaboration at Jefferson Lab, and in agreement with the muonic hydrogen experiments. Our prediction for the proton elastic form factor ratio ${\mu }_p{G}_E^p/G_M^p$ is also in very good agreement with the recent high precision Jefferson Lab recoil polarization experiment E08-007 for $Q^2=0.3-0.6{\text{GeV}}^2$, and with the recent high precision Mainz A1 experiment for $Q^2<0.13{\text{GeV}}^2$.

   ↳ hep-phhep-exhep-thnucl-ex+1NPB(2023)·18 citations
4. 04*

   The bosonic algebraic approach applied to the $[QQ][\bar{Q}\bar{Q}]$ tetraquarks

   A. J. Majarshin🇨🇳 · Yan-An Luo🇨🇳 · Feng Pan🇨🇳 · Jorge Segovia🇪🇸

   The exact eigenenergies of the $T_{4c}=[cc][\bar{c}\bar{c}]$, $T_{4b}=[bb][\bar{b}\bar{b}]$, and $T_{2[bc]}=[bc][\bar{b}\bar{c}]$ tetraquarks are calculated within the extended transitional Hamiltonian approach, in which the so-called Bethe \emph{ansatz} within an infinite-dimensional Lie algebra is used. We fit the parameters appearing in the transitional region from phenomenology associated with potential candidates of tetraquarks. The rotation and vibration transitional theory seems to provide a better description of heavy tetraquarks than other attempts within the same formalism. Our results indicate that the pairing strengths are large enough to provide binding; an extended comparison with the current literature is also performed.

   ↳ hep-phhep-exhep-latnucl-ex+1PRD(2022)·17 citations
5. 05*

   Accessing quark GPDs in diffractive events at an electron-ion collider

   W. Cosyn🇺🇸 · B. Pire🇫🇷 · L. Szymanowski🇵🇱

   We discuss two collider processes which combine a diffractively produced $\rho$ meson separated by a large rapidity gap from a hard exclusive scattering of a Pomeron on a nucleon, giving rise to a lepton pair or to a second meson. These two processes probe the nucleon quark content described by generalized parton distributions in a very specific way.

   ↳ hep-phhep-exnucl-exSciPost Phys.Proc.(2022)·2 citations
6. 06*

   Phase-space distributions of nuclear short-range correlations

   W. Cosyn🇺🇸 · J. Ryckebusch🇧🇪

   Nuclear short-range correlations (SRCs) induce high-momentum/high-energy fluctuations in the nuclear medium. In order to assess their impact on nuclear bulk properties, like nuclear radii and kinetic energies, it is instrumental to determine how SRCs are distributed in phase space as this sheds light on the connection between their appearance in coordinate and momentum space. Using the lowest-order correlation operator approximation (LCA) to include SRC, we compute two-dimensional nuclear Wigner quasiprobability distributions $w(r,k)$ to locate those $(r,k)$ phase-space regions that are most heavily impacted by SRCs. The SRC-induced high-momentum components find their origin in a radial range that is confined to the nuclear interior. Significant SRCs strength is generated in the full momentum range $0\le k\lesssim 5{\text{fm}}^{-1}$ covered in this work, but below the Fermi momentum those are dwarfed by the mean-field contributions. As an application of $w(r,k)$, we focus on the radial dependence of the kinetic energy $T$ and the momentum dependence of the radius $r_{\text{rms}}$ for the symmetric nuclei ${}^{12}$C, ${}^{40}$Ca and the asymmetric nucleus ${}^{48}$Ca. The kinetic energy almost doubles after including SRCs, with the largest increase occurring in the nuclear interior $r\lesssim 2$ fm. The momentum dependence of the $r_{\text{rms}}$ teaches that the largest contributions stem from $k\lesssim 2$ fm${}^{-1}$, where the SRCs induce a slight reduction of the order of a few percent. The SRCs systematically reduce the ${}^{48}$Ca neutron skin by an amount that can be 10\%.

   ↳ nucl-thnucl-exPLB(2021)·22 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.