Fri·Mar 4, 2022Friday·March 4, 2022

1. 01*

   Determination of the argon spectral function from (e,e'p) data

   L. Jiang🇺🇸 · A. M. Ankowski🇺🇸 · D. Abrams🇺🇸 · L. Gu🇺🇸 · B. Aljawrneh🇺🇸 · S. Alsalmi🇸🇦 · J. Bane🇺🇸 · A. Batz🇺🇸 · S. Barcus🇺🇸 · M. Barroso🇺🇸 · V. Bellini🇮🇹 · O. Benhar🇮🇹 and 51 other authors

   The E12-14-012 experiment, performed in Jefferson Lab Hall A, has measured the $(e,e^{\prime }p)$ cross section in parallel kinematics using a natural argon target. Here, we report the full results of the analysis of the data set corresponding to beam energy 2.222 GeV, and spanning the missing momentum and missing energy range $15\lesssim p_m\lesssim 300$ MeV/c and $12\lesssim E_m\lesssim 80$ MeV. The reduced cross section, determined as a function of $p_m$ and $E_m$ with $\approx$4\% accuracy, has been fitted using the results of Monte Carlo simulations involving a model spectral function and including the effects of final state interactions. The overall agreement between data and simulations turns out to be quite satisfactory (${\chi }^2$/n.d.o.f.=1.9). The resulting spectral function will provide valuable new information, needed for the interpretation of neutrino interactions in liquid argon detectors.

   nucl-exhep-exPRD(2022)·47 citations
2. 02*

   Overview of intermittency analysis in heavy-ion collisions

   Zhiming Li🇨🇳

   In this paper, a search for power-law fluctuations with fractality and intermittency analysis to explore the QCD phase diagram and the critical point is summarized. Experimental data on self-similar correlations and fluctuations with respect to the size of phase space volume in various high energy heavy-ion collisions are presented, with special emphasis on background subtraction and efficiency correction of the measurement. Phenomenological modelling and theoretical work on the subject are discussed. Finally, we highlight possible directions for future research.

   ↳ nucl-thhep-phnucl-exMod.Phys.Lett.A(2022)·13 citations
3. 03*

   Probing the dark photon via polarized DIS scattering at the HERA and EIC

   Bin Yan🇺🇸

   The dark photon is widely predicted in many new physics beyond the Standard Model. In this work, we propose to utilize the polarized lepton cross section in neutral current DIS process at the HERA and upcoming Electron-Ion Collider (EIC) to probe the properties of the dark photon. It shows that we can constrain the mixing parameter $ϵ<0.02$ when the dark photon mass $m_{A_D}<10\mathrm{GeV}$ at the HERA with polarized lepton beam and this bound is comparable to the limit from the unpolarized HERA data. With the help of high integrated luminosity and high electron beam polarization of the EIC, the upper limit of the $ϵ$ could be further improved. Depending on the assumption of the systematic error of the cross section measurements, we obtain $ϵ<0.01\sim 0.02$ for the mass region $m_{A_D}<10\mathrm{GeV}$ under the integrated luminosity of $300{\mathrm{fb}}^{-1}$. We also discuss the complementary roles between the cross section and the single-spin asymmetry measurements in probing the dark photon.

   ↳ hep-phhep-exnucl-exPLB(2022)·40 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.