Thu·Nov 2, 2017Thursday·November 2, 2017

1. 01*

   ${\eta }_c^{\prime }$ Hadroproduction at Next-to-Leading Order and its Relevance to ${\psi }^{\prime }$ Production

   Jean-Philippe Lansberg🇫🇷 · Hua-Sheng Shao🇫🇷 · Hong-Fei Zhang🇨🇳

   We proceed to the first study of ${\eta }_c^{\prime }$ prompt hadroproduction at next-to-leading order in ${\alpha }_s$. Based on heavy-quark-spin symmetry, which is systematically used in quarkonium-production phenomenology, we demonstrate that prompt ${\eta }_c^{\prime }$ can be studied at the LHC with the existing data. We emphasize its relevance to constrain ${\psi }^{\prime }$ production, in the same way as the first prompt ${\eta }_c^{\prime }$ data at the LHC lately strongly impacted the phenomenology of $J/\psi$ studies.

   ↳ hep-phhep-exnucl-exnucl-thPLB(2018)·31 citations
2. 02*

   News on mean pion multiplicity from NA61/SHINE

   Michał Naskręt (for the NA61/SHINE Collaboration)🇵🇱

   NA61/SHINE is a large acceptance fixed target experiment at the CERN SPS which studies final hadronic states in interactions between various particles and nuclei. The main topic of this contribution are preliminary results for mean negatively charged pion multiplicities $⟨{\pi }^{-}⟩$ from central Ar+Sc and Be+Be collisions. The data were taken recently by the NA61/SHINE collaboration for a wide range of beam momenta. Measured rapidity distributions $\frac{dn}{dy}$ were extrapolated to unmeasured regions to obtain total multiplicities $⟨{\pi }^{-}⟩$. A new scheme to calculate the mean number of wounded nucleons $⟨W⟩$ utilizing the EPOS MC model is described. Using data from other experiments, a comparison of $\frac{⟨\pi ⟩}{⟨W⟩}$ for different collisions and beam momenta is discussed

   ↳ hep-exnucl-exEPJ Web Conf.(2018)·0 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.