Thu·Aug 2, 2018Thursday·August 2, 2018

1. 01*

   Re-examining the premise of isobaric collisions and a novel method to measure the chiral magnetic effect

   Hao-jie Xu🇨🇳 · Jie Zhao🇺🇸 · Xiaobao Wang🇨🇳 · Hanlin Li🇨🇳 · Zi-Wei Lin🇺🇸 · Caiwan Shen🇨🇳 · Fuqiang Wang🇺🇸

   In this proceeding we will show that the expectations of the isobaric ${}_{44}^{96}\mathrm{Ru}{+}_{44}^{96}\mathrm{Ru}$ and ${}_{40}^{96}\mathrm{Zr}{+}_{40}^{96}\mathrm{Zr}$ collisions on chiral magnetic effect (CME) search may not hold as originally anticipated due to large uncertainties in the isobaric nuclear structures. We demonstrate this using Woods-Saxon densities and the proton and neutron densities calculated by the density functional theory. Furthermore, a novel method is proposed to gauge background and possible CME contributions in the same system, intrinsically better than the isobaric collisions of two different systems. We illustrate the method with Monte Carlo Glauber and AMPT (A Multi-Phase Transport) simulations.

   ↳ nucl-thhep-phnucl-exNPA(2019)·4 citations
2. 02*

   Observation of a Fine Structure in $e^{+}{e}^{-}\to$ hadrons Production at the Nucleon-antinucleon Threshold

   CMD-3 Collaboration

   A study of hadron production at the nucleon-antinucleon threshold has been performed with the CMD-3 detector at the VEPP-2000 $e^{+}{e}^{-}$ collider. A very fast rise with about 1 MeV width has been observed in the $e^{+}{e}^{-}\to p\bar{p}$ cross section. A sharp drop in the $e^{+}{e}^{-}\to 3({\pi }^{+}{\pi }^{-})$ cross section has been confirmed and found to have a less than 2 MeV width, in agreement with the observed fast rise of the $e^{+}{e}^{-}\to p\bar{p}$ cross section. For the first time a similar sharp drop is demonstrated in the $e^{+}{e}^{-}\to K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}$ cross section. The behavior of the $e^{+}{e}^{-}\to 3({\pi }^{+}{\pi }^{-}),K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}$ cross sections cannot be explained by an interference of any resonance amplitude with continuum, therefore this phenomenon cannot be due to a narrow near-threshold resonance. No such structure has been observed in the $e^{+}{e}^{-}\to 2({\pi }^{+}{\pi }^{-})$ cross section.

   ↳ hep-exnucl-exPLB(2019)·56 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.