Tue·Jan 31, 2017Tuesday·January 31, 2017

1. 01*

   Estimation of reactor neutrino fluxes

   Daniel A. Dwyer🇺🇸

   Reactor antineutrinos have been indispensable for our understanding of neutrino mass and mixing. At the same time, discrepancies between the observed and predicted reactor ${\overline{\nu }}_e$ rate and energy spectra have grown as the precision of these measurements has improved. Measurements of the electrons emitted following fission result in the most precise predictions for the corresponding ${\overline{\nu }}_e$ flux, and our understanding of the potential systematic differences between the fission $e^{-}$ and ${\overline{\nu }}_e$ fluxes has improved. Measurements of individual fission daughter isotopes and their decays are fraught with uncertainties, yet still provide insight into these discrepancies. Detailed comparisons of ${\overline{\nu }}_e$ measurements among reactors are also shedding new light on this topic.

   nucl-exhep-exPoS(2016)·0 citations
2. 02*

   Probing Nuclear PDF and Gluon Saturation At The LHC with Forward Direct Photons

   Mauro R. Cosentino (for the ALICE FoCal Collaboration)🇧🇷

   In relativistic nuclear collisions some of the important aspects to be addressed are the effects of the nuclear PDF and the gluon saturation. In the LHC the best way to address these questions is by means of pA collisions and in particular through the measurement of direct photon production in the forward direction. In order to achieve this measurement a new forward calorimeter (FoCal) is proposed as an upgrade to the ALICE experiment. The proposed detector will cover the range 3.5 < $\eta$ < 5, probing the gluon distributions at x$\sim$10${}^{-5}$ and Q$\sim p_{\mathrm{T}}$ > 4 GeV. We will discuss performance studies and demonstrate that extremely high-granularity calorimetry is required for such measurement. We will also present a few results from R\&D for this project.

   nucl-exPoS(2017)·1 citation
3. 03*

   $D$ - meson production at very forward rapidities: estimating the intrinsic charm contribution

   F. Carvalho🇧🇷 · A.V. Giannini🇧🇷 · V.P. Goncalves🇧🇷 · F.S. Navarra🇧🇷

   We study $D$ - meson production at forward rapidities taking into account the non - linear effects in the QCD dynamics and the intrinsic charm component of the proton wave function. The total cross section, the rapidity distributions and the Feynman - $x$ distributions are calculated for $pp$ collisions at different center of mass energies. Our results show that, at the LHC, the intrinsic charm component changes the $D$ rapidity distributions in a region which is beyond the coverage of the LHCb detectors. At higher energies the IC component dominates the $y$ and $x_F$ distributions exactly in the range where the produced $D$ mesons decay and contribute the most to the prompt atmospheric neutrino flux measured by the ICECUBE Collaboration. We compute the $x_F$ - distributions and demonstrate that they are enhanced at LHC energies by approximately one order of magnitude in the $0.2\le x_F\le 0.8$ range.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2017)·20 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.