Wed·Dec 16, 2015Wednesday·December 16, 2015

1. 01*

   Measurements of open-charm production in pp and p-Pb collisions with the ALICE detector at the LHC

   Chitrasen Jena (for the ALICE Collaboration)🇮🇹

   Hadrons containing heavy quarks, i.e. charm and beauty, are effective probes to investigate the properties of the hot, dense and strongly-interacting medium formed in high-energy nuclear collisions. The relatively large masses of heavy quarks ensure that they are predominantly produced in the early stages of the collision and probe the complete space-time evolution of the expanding medium. The measurements of D-meson production in pp collisions provide an important test of pQCD calculations and serve as an essential baseline for the comprehensive studies in heavy-ion collisions. The study of D-meson production in p-Pb collisions is necessary to disentangle the cold nuclear matter effects from hot nuclear matter effects. The measurement of heavy-flavour production as a function of charged-particle multiplicity in pp and p-Pb collisions could provide insight into the role of multi-parton interactions at LHC energies. We present ALICE results on D-meson production in pp collisions at $\sqrt{s}=$ 7 TeV and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV. The D-meson yields per event, measured in different multiplicity intervals and normalized to their multiplicity-integrated values, are presented for pp and p-Pb collisions. The $p_{\mathrm{T}}$-differential production cross section and nuclear modification factor of prompt D mesons are measured in p-Pb collisions. The nuclear modification factor, $R_{\mathrm{pPb}}$, is compatible with unity within uncertainties, indicating that cold nuclear matter effects are small for $p_{\mathrm{T}}\gtrsim 3$ GeV/$c$. The D-meson transverse momentum distributions in p-Pb collisions relative to pp collisions, measured in several multiplicity classes, are also discussed.

   nucl-exhep-exhep-phPoS(2017)·2 citations
2. 02*

   Track identification and reconstruction in fast neutron detection by MPGD

   Yi Zhang · Huiyin Wu · Shengying Zhao · Bitao Hu

   Micro pattern gaseous detectors have been widely used in position measurements of particle detection in the last two decades. In this work a novel method of track identification and reconstruction was developed for fast neutron detection by MPGD, which in most cases requires a strong rejection of the gamma background. Based on this method, an online tracking system can be built in a FPGA-based Daq system to significantly improve both the capability of counting rate and the spatial resolution. This work also offers a potential usage in future hadron experiments such as SoLID spectrometer in Jeffereson Lab.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2018)·2 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.