arXiv subjects

Andrea Dainese

Publications and source records attributed to Andrea Dainese.

22 records · Page 2Linked to original sources

arXiv2004

Perspectives for the study of charm in-medium quenching at the LHC with ALICE

Charm mesons produced in nucleus-nucleus collisions are expected to be less attenuated (quenched) by the medium than hadrons containing only light quarks, since radiative energy loss of heavy quarks should be reduced by the `dead-cone' effect. We start from a published energy-loss model to derive the quenching for D mesons at the LHC, introducing an approximation of the dead-cone effect and employing a Glauber-based description of the geometry of central Pb-Pb collisions to estimate the in-medium path lengths of c quarks. We show that the exclusive reconstruction of D^0 \to Kπdecays in ALICE allows to measure the nuclear modification factor of the D mesons transverse momentum distribution and the D/(charged hadrons) ratio and, thus, to investigate the energy loss of c quarks.

nucl-ex↗

arXiv2004

Probing the QGP with charm at ALICE-LHC

The exclusive reconstruction of D^0 mesons in the ALICE experiment allows to study the QCD energy loss of charm quarks in the deconfined quark-gluon plasma (QGP) medium expected to be produced in central nucleus-nucleus collisions at the Large Hadron Collider.

nucl-ex↗

arXiv2003

Charm production and in-medium QCD energy loss in nucleus-nucleus collisions with ALICE. A performance study

This work is aimed at studying the performance of the ALICE detector for measuring charm production in heavy ion collisions at the LHC and for investigating the properties of the deconfined quark-gluon medium formed in central nucleus-nucleus reactions by a comparison of its `opacities' to massive (charm) quarks and massless partons. The topics discussed in the thesis can be summarized as follows. Definition of a baseline for heavy quarks production cross sections and kinematical distributions at LHC energies, using (and comparing) pQCD tools (HVQMNR program) and the PYTHIA event generator. Study of the experimental issues related to the identification of the displaced decay vertices of charm mesons: track impact parameter resolution and primary vertex reconstruction. Definition of a strategy for the exclusive reconstruction of D^0 \to Kπdecays with ALICE in Pb-Pb and pp collisions and evaluation of the performance in terms of momentum range, precision and accuracy of the measurement. Study and simulation of the predicted parton energy loss effect, including a realistic description of the collision geometry and an algorithm to take into account the expected lower loss for heavy quarks (dead cone effect). Assessment of a strategy to carry out comparative measurements of the quenching of charm quarks and massless partons and evaluation of the attainable sensitivity.

nucl-ex↗

arXiv2003

Charm and beauty production at LHC

This note will be part of Chapter 6.5 of the ALICE Physics Performance Report (PPR), "ALICE Physics: Charm and Beauty", where the capabilities of ALICE for the detection of open heavy flavour particles will be described. We define here the present ALICE baseline for what concerns the heavy flavour production cross sections at LHC and the kinematical distributions of the heavy quark pairs. We start by qualitatively assessing the Bjorken x regimes accessible with charm and beauty measurements at LHC with ALICE (Section 1). In Section 2 we report the most recent results (and the uncertainties) of the next-to-leading order (NLO) pQCD calculations for the cross sections in pp collisions at LHC energies. These results are extrapolated to Pb-Pb collisions in Section 3.1 and to p-Pb collisions in Section 3.2, taking into account nuclear shadowing and parton intrinsic transverse momentum broadening.Heavy quark kinematics as given by the NLO pQCD calculation are reported in Section 4. We tuned the PYTHIA event generator in order to reproduce such results for what concerns the c and b quarks transverse momentum distributions (Section 5). Finally, we report the yields and transverse momentum distributions for D and B mesons (Section 6).

hep-ph↗