arXiv subjects

S. Masciocchi

Publications and source records attributed to S. Masciocchi.

21 records · Page 2Linked to original sources

arXiv2012

Heavy-flavour production in ALICE at the LHC

ALICE at the LHC is the experiment dedicated to study the physics of nucleus-nucleus collisions. The apparatus is well suited for the measurement of heavy-quark hadron production, making use of the high spatial resolution provided by the tracking detectors and the excellent particle identification, which are distinctive of the ALICE apparatus. Results from proton-proton collisions at sqrt(s) = 2.76 and 7 TeV, and from Pb--Pb collisions at sqrt(s_NN) = 2.76 TeV are presented. The measurements in pp collisions provide an important test of perturbative QCD predictions. The precise vertex reconstruction together with the electron identification, allows the separation of the charm and the beauty components. Furthermore, the pp results are essential as a reference for the measurements in heavy-ion collisions. Nuclear modification factors were measured for D mesons, for electrons and for muons from heavy-flavour hadron decays. The elliptic flow of D mesons is also discussed. These measurements are important because they will provide information on the Quark-Gluon Plasma produced in heavy-ion collisions, via the energy loss of the heavy partons in the strongly interacting medium, and hints on the medium thermalization.

nucl-ex↗

arXiv2011

Investigation of charm and beauty production via semileptonic decays of heavy-flavour hadrons in pp at 7 TeV and Pb--Pb at 2.76 TeV with ALICE

Electron spectra measured with ALICE at mid-rapidity are used to study the production of hadrons carrying a charm or a beauty quark. The production cross section of electrons from heavy-flavour hadron decays is measured in pp collisions at $\sqrt{s}$=7 TeV. Electrons from the beauty decays are identified via the displacement from the interaction vertex. From the electron spectra measured in Pb--Pb collisions, we determine the nuclear modification factor, which is sensitive to the heavy-quark energy loss in a hot strongly interacting medium.

nucl-ex↗

arXiv2007

Observation of a resonance in the K$_s$p decay channel at a mass of 1765 MeV/c$^2$

We report on the observation of a K$_s$p resonance signal at a mass of 1765$\pm$5 MeV/c$^2$, with intrinsic width $Γ= 108\pm 22$ MeV/c$^2$, produced inclusively in $Σ^-$-nucleus interactions at 340 GeV/c in the hyperon beam experiment WA89 at CERN. The signal was observed in the kinematic region $x_F>0.7$, in this region its production cross section rises approximately linearly with $(1-x_F)$, reaching $BR(X\to K_S p)\cdot dσ/dx_F = (5.2\pm 2.3) μb $ per nucleon at $x_F=0.8$. The hard \xf spectrum suggests the presence of a strong leading particle effect in the production and hence the identification as a $Σ^{*+}$ state. No corresponding peaks were observed in the $K^- p$ and $Λπ^{\pm}$ mass spectra.

hep-ex↗