Orateur
Dr
Antonio Uras
(IPNL Lyon)
Description
ALICE is the experiment dedicated to the study of the quark gluon plasma in heavy-ion collisions
at the LHC. Improvement of ALICE sub-detectors for the upgrade plans of the year 2017 are
ongoing. The Muon Forward Tracker (MFT) is a proposal in view of this upgrade. The MFT is a
silicon pixels detector added in the Muon Spectrometer acceptance ($−4 < \eta < −2.5$) upstream
of the hadronic absorber. The MFT upgrade is motivated by several physics improvements. The
measurement of the DCA (Distance of Closest Approach) of single muons and secondary vertex
from dimuons will permit the identification of open charm ($c\tau \sim 150 \mu$m) and beauty
($c\tau \sim 500 \mu$m) mesons. The MFT, thanks to its tracking capabilities, will allow to improve the mass resolution
of the resonances for a better separation between $\rho/\omega$ and $\phi$, $J/\psi$ and $\psi'$, and $\upsilon$ family
resonances. In addition, it will help to reject a large fraction of muons coming from pion and
kaon decays, improving the signal over background ratio. Moreover, the MFT will lead to the
direct multiplicity measurement, event by event, of charged particles within the spectrometer acceptance.
In order to evaluate the feasability of this upgrade, a setup composed by five silicon planes was simulated
within the AliRoot framework. A detailed study of the influence of the beam pipe geometry
on secondary particles production was performed. The method used for traking in the planes and attaching
the MFT clusters to the muon tracks will be presented, together with the performances of the MFT in terms of
occupancy rate in the pixel planes, secondary vertex measurement, improvement of the dimuon
invariant mass resolution.
Auteur principal
Dr
Antonio Uras
(IPNL Lyon)
Co-auteur
Laure Massacrier
(IPNL & Université Lyon 1, Lyon)
