Fri·Aug 15, 2014Friday·August 15, 2014

1. 01*

   Neutron production and thermal moderation at the PSI UCN source

   H.Becker · G.Bison🇨🇭 · B.Blau🇨🇭 · Z.Chowdhuri🇨🇭 · J.Eikenberg🇨🇭 · M.Fertl🇨🇭 · K.Kirch🇨🇭 · B.Lauss🇨🇭 · G.Perret🇨🇭 · D.Reggiani🇨🇭 · D.Ries🇨🇭 · P.Schmidt-Wellenburg🇨🇭 and 3 other authors

   We report on gold foil activation measurements performed along a vertical channel along the tank of the ultracold neutron source at the Paul Scherrer Institute. The activities obtained at various distances from the spallation target are in very good agreement with MCNPX simulations which take into account the detailed description of the source as built.

   nucl-exphysics.ins-detNucl.Instrum.Meth.A(2015)·23 citations
2. 02*

   Measurement of the transverse target and beam-target asymmetries in $\eta$ meson photoproduction at MAMI

   C.S.Akondi🇺🇸 · J.R.M.Annand🇬🇧 · H.J.Arends🇩🇪 · R.Beck🇩🇪 · A.Bernstein🇺🇸 · N.Borisov🇷🇺 · A.Braghieri🇮🇹 · W.J.Briscoe🇺🇸 · S.Cherepnya🇷🇺 · C.Collicott🇨🇦 · S.Costanza🇮🇹 · E.J.Downie🇩🇪 and 58 other authors

   We present new data for the transverse target asymmetry T and the very first data for the beam-target asymmetry F in the $\vec{\gamma }\vec{p}\to \eta p$ reaction up to a center-of-mass energy of W=1.9 GeV. The data were obtained with the Crystal-Ball/TAPS detector setup at the Glasgow tagged photon facility of the Mainz Microtron MAMI. All existing model predictions fail to reproduce the new data indicating a significant impact on our understanding of the underlying dynamics of $\eta$ meson photoproduction. The peculiar nodal structure observed in existing T data close to threshold is not confirmed.

   nucl-exhep-exnucl-thPRL(2014)·53 citations
3. 03*

   Centrality dependence of high energy jets in p+Pb collisions at the LHC

   Adam Bzdak🇺🇸 · Vladimir Skokov🇺🇸 · Stefan Bathe🇺🇸

   The recently measured centrality dependence of high energy jets in proton-lead collisions at the LHC is investigated. We hypothesize that events with jets of very high energy (a few hundred GeV) are characterized by a suppressed number of soft particles, thus shifting these events into more peripheral bins. This naturally results in the suppression (enhancement) of the nuclear modification factor, $R_{pA}$, in central (peripheral) collisions. Our calculations suggest that a moderate suppression of the order of $20\%$, for $10^3$ GeV jets, can quantitatively reproduce the experimental data. We further extract the suppression factor as a function of jet energy and test our conjecture using available $R_{pA}$ data for various centralities.

   ↳ hep-phhep-exnucl-exnucl-thPRC(2016)·38 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.