Study of $\rm D^{0}$ signal extraction in ALICE using combinatorial background subtraction techniques

20 May 2014, 16:30
spectrum (darmstadtium)



Board: F-20
Poster Open Heavy Flavour and Quarkonia Poster session


Chitrasen Jena (Universita e INFN (IT))


Charm and beauty quarks are powerful probes to investigate the properties of the Quark-Gluon Plasma (QGP) produced in high-energy heavy-ion collisions. Due to their large mass, they are produced in the initial hard scattering processes and thus they experience the whole evolution of the system formed in the collision. They interact strongly with the deconfined medium, losing energy and possibly participating in the collective expansion. The precise measurement of the nuclear modification factor ($R_{\rm AA}$) and the elliptic flow ($v_{2}$) of D mesons in Pb-Pb collisions provides a stringent constraint to theoretical models describing the interaction of heavy quarks with the medium. The standard procedure for the reconstruction of D mesons, via their hadronic decay channels, in ALICE is based on the selection of displaced secondary vertices, which rejects a large part of the combinatorial background. A complementary approach has been recently studied, in which less stringent selections are applied and the background is subtracted using the event-mixing, like-sign or track-rotation techniques. We will present the status of the studies on the $\rm D^{0}$ signal extraction at low $p_{\rm T}$ in pp and p-Pb collisions at $\sqrt{s_{\rm NN}} =$ 7 TeV and 5.02 TeV, respectively, using this complementary approach.
On behalf of collaboration: ALICE

Primary author

Chitrasen Jena (Universita e INFN (IT))

Presentation Materials