Wed·Jul 6, 2016Wednesday·July 6, 2016

1. 01*

   Upgrade of the ALICE Inner Tracking System

   Iouri Belikov (for the ALICE Collaboration)🇫🇷

   A Large Ion Collider Experiment (ALICE) is built to study the properties of the strongly interacting matter created in heavy-ion collisions at the LHC. With the upgrade of its Inner Tracking System (ITS), the ALICE experiment is going to increase the rate of data taking by almost two orders of magnitude. At the same time, the precision of secondary vertex reconstruction will become by at least a factor 3 better than it currently is. In this talk, we briefly show some selected physics results motivating the upgrade of the ITS, describe the design goals and the layout of the new detector, and highlight a few important measurements that will be realized after the completion of this upgrade.

   ↳ physics.ins-dethep-exnucl-exEPJ Web Conf.(2016)·3 citations
2. 02*

   Dark matter search in a Beam-Dump eXperiment (BDX) at Jefferson Lab

   M. Battaglieri🇮🇹 · A. Bersani🇮🇹 · B. Caiffi🇮🇹 · A. Celentano🇮🇹 · R. De Vita🇮🇹 · E. Fanchini🇮🇹 · L. Marsicano🇮🇹 · P. Musico🇮🇹 · M. Osipenko🇮🇹 · F. Panza🇮🇹 · M. Ripani🇮🇹 · E. Santopinto🇮🇹 and 92 other authors

   MeV-GeV dark matter (DM) is theoretically well motivated but remarkably unexplored. This proposal presents the MeV-GeV DM discovery potential for a $\sim$1 m${}^3$ segmented CsI(Tl) scintillator detector placed downstream of the Hall A beam-dump at Jefferson Lab, receiving up to 10${}^{22}$ electrons-on-target (EOT) in 285 days. This experiment (Beam-Dump eXperiment or BDX) would be sensitive to elastic DM-electron and to inelastic DM scattering at the level of 10 counts per year, reaching the limit of the neutrino irreducible background. The distinct signature of a DM interaction will be an electromagnetic shower of few hundreds of MeV, together with a reduced activity in the surrounding active veto counters. A detailed description of the DM particle $\chi$ production in the dump and subsequent interaction in the detector has been performed by means of Monte Carlo simulations. Different approaches have been used to evaluate the expected backgrounds: the cosmogenic background has been extrapolated from the results obtained with a prototype detector running at INFN-LNS (Italy), while the beam-related background has been evaluated by GEANT4 Monte Carlo simulations. The proposed experiment will be sensitive to large regions of DM parameter space, exceeding the discovery potential of existing and planned experiments in the MeV-GeV DM mass range by up to two orders of magnitude.

   ↳ hep-exastro-ph.COhep-phnucl-ex101 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.