Speaker
Indranil Das
(Saha Institute of Nuclear Physics (IN))
Description
Quarkonium, i.e. bound states of heavy quark and antiquarks
($c\bar{c}$
or $b\bar{b}$), are important observables to study the
properties of nuclear matter at extreme energy-densities, where Lattice
QCD calculations predict a phase transition from hadronic matter to
the Quark-Gluon Plasma (QGP). In high energy heavy-ion collisions, the
QGP can be studied using the suppression of bottomonium production, due
to the color screening, with respect to the proton-proton results
scaled by the number of binary collisions. However, this measurement can
be biased by the possible presence of cold nuclear matter effects,
which can be estimated using proton-nucleus collisions, where the QGP
formation is not expected.
ALICE measures bottomonium production at forward rapidity ($2.5\le y\le4$) down to zero transverse momentum via the dimuon decay channel. In this presentation, the nuclear modification factor of $\Upsilon$ measured in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV and p-Pb collisions at
$\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV will be discussed. ALICE measurements of the bottomonium production for pp collisions will be also presented. The results will be compared to other LHC experimental measurements and to theoretical calculations.
| On behalf of collaboration: | ALICE |
|---|
Author
Indranil Das
(Saha Institute of Nuclear Physics (IN))
