Wed·May 25, 2022Wednesday·May 25, 2022

1. 01*

   Precision Determination of the Neutral Weak Form Factor of ${}^{48}$Ca

   D. Adhikari🇺🇸 · H. Albataineh🇺🇸 · D. Androic🇭🇷 · K.A. Aniol🇺🇸 · D.S. Armstrong🇺🇸 · T. Averett🇺🇸 · C. Ayerbe Gayoso🇺🇸 · S.K. Barcus🇺🇸 · V. Bellini🇮🇹 · R.S. Beminiwattha🇺🇸 · J.F. Benesch🇺🇸 · H. Bhatt🇺🇸 and 90 other authors

   We report a precise measurement of the parity-violating asymmetry $A_{\mathrm{PV}}$ in the elastic scattering of longitudinally polarized electrons from ${}^{48}\mathrm{Ca}$. We measure $A_{\mathrm{PV}}=2668\pm 106(\mathrm{stat})\pm 40(\mathrm{syst})$ parts per billion, leading to an extraction of the neutral weak form factor $F_{\mathrm{W}}(q=0.8733$ fm${}^{-1})=0.1304\pm 0.0052(\mathrm{stat})\pm 0.0020(\mathrm{syst})$ and the charge minus the weak form factor $F_{\mathrm{ch}}-F_{\mathrm{W}}=0.0277\pm 0.0055$. The resulting neutron skin thickness $R_n-R_p=0.121\pm 0.026(\exp )\pm 0.024(\mathrm{model})$~fm is relatively thin yet consistent with many model calculations. The combined CREX and PREX results will have implications for future energy density functional calculations and on the density dependence of the symmetry energy of nuclear matter.

   nucl-exnucl-thPRL(2022)·380 citations
2. 02*

   Accessing DEMP and DVCS at Backward Angles above the Resonance Region

   W. B. Li🇺🇸 · J. R. Stevens🇺🇸 · G. M. Huber🇨🇦

   The proposed measurement is a dedicated study to investigate the exclusive electroproduction process: 1H(e, e'p)X, in the backward angle above the resonance region. Here, the produced particle X (pi0 or gamma) is emitted 180 degrees opposite to the virtual photon momentum. This study will apply the well-known L/T separation method of the electroproduction process to this unexplored backward angle kinematics region. The available theoretical frameworks give parallel interpretations to the backward angle meson production at the proposed kinematics. According to the QCD GPD-like TDA model, backward meson production as the virtual-photon probes the transverse meson cloud structure inside of the nucleon; whereas the hadronic Regge based model describes backward meson production as the interference between nucleon exchange and the meson produced via re-scattering of the nucleon. Testing these two approaches is like testing the onset of quarks and gluon physics, i.e. going deeper into the structure of nucleon to probe its quark and gluon content. Combining knowledge from both frameworks has the potential to provide complementary knowledge to the forward angle physics programs and obtain new physics insights to study the QCD transition from meson-nucleon to quark-hadron degrees of freedom.

   nucl-exhep-ph1 citation
3. 03*

   Fully-charm and -bottom pentaquarks in a Lattice-QCD inspired quark model

   Gang Yang🇨🇳 · Jialun Ping🇨🇳 · Jorge Segovia🇪🇸

   The fully-charm and -bottom pentaquarks, \emph{i.e.} $cccc\bar{c}$ and $bbbb\bar{b}$, with spin-parity quantum numbers $J^P={\frac{1}{2}}^{-}$, ${\frac{3}{2}}^{-}$ and ${\frac{5}{2}}^{-}$, are investigated within a Lattice-QCD inspired quark model, which has already successfully described the recently announced fully-charm tetraquark candidate $X(6900)$, and has also predicted several other fully-heavy tetraquarks. A powerful computational technique, based on the Gaussian expansion method combined with a complex-scaling range approach, is employed to predict, and distinguish, bound, resonance and scattering states of the mentioned five-body system. Both baryon-meson and diquark-diquark-antiquark configurations, along with all of their possible color channels are comprehensively considered. Narrow resonances are obtained in each spin-parity channel for the fully-charm and -bottom systems. Moreover, most of them seems to be compact multiquarks whose wave-functions are dominated by either hidden-color baryon-meson or diquark-diquark-antiquark structure, or by the coupling between them.

   ↳ hep-phhep-exhep-latnucl-ex+1PRD(2022)·27 citations
4. 04*

   Widerange $T_{\alpha }$-$Q_{\alpha }$ formula for real time application

   D.Ibadullayev · Yu.S.Tsyganov

   A new wide-range formula $T_{\alpha }=f(Q_{\alpha })$ to operate with the new DGFRS2 analog spectrometer installed at the DC-280 cyclotron facility is presented. The main goal of this formula application algorithm is to search the optimal time correlation recoil-alpha parameter directly during the execution of the C++ acquisition code. Note that the spectrometer operates together with the 48x128 strip DSSD (Double Side Strip Detector) detector and low-pressure pentane-filled gaseous detector. Comparison with others known formulas is performed for Z=119,120 nuclei.

   ↳ physics.ins-detnucl-ex0 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.