Search

The first measurements of the invariant differential cross sections of inclusive π0 and η meson production with ALICE are presented for pp collisions at [formula] and 7 TeV. Next-to-Leading Order perturbative QCD calculations overestimate the data at [formula], but are consistent with the π0 spectrum at [formula] and with the measured π0/η cross section ratio at [formula]. The nuclear modification factors (RAA) of π0 production at different centralities show a strong suppression with respect to pp collisions. [ABSTRACT FROM AUTHOR]

A Large Ion Collider Experiment (ALICE) is one of the four experiments at the Large Hadron Collider (LHC), and it is dedicated to the study of ultra-relativistic heavy-ion collisions, with the goal of investigating the properties of the high-density state of QCD matter produced in such events. The first Pb-Pb collisions at a centre of mass energy of [formula] TeV per nucleon pair were delivered by LHC in November 2010. In Pb-Pb collisions heavy quarks are regarded as sensitive probes of the interaction dynamics between the parton and the medium produced in such collisions as they are produced on a very short time scale in the initial hard scattering processes and they follow all the evolution of the medium. At the energies available at the LHC charm is produced with large cross section and therefore it is possible to measure its production with good statistical precision. The study of open charm hadrons such as D+, D0, D*+, Ds and Λc in heavy ion collision is of particular interest because it can provide significant insight on the properties of the medium. Proton-proton collision data, that are being recorded at an energy of [formula] TeV since March 2010 provide an essential reference for these studies and allow to test perturbative QCD calculations in an unexplored energy domain. In this paper the analysis of D-meson production, carried out through a study of the hadronic decay channels in Pb-Pb collisions, will be presented in detail. The results for the reconstruction of D0, D+, D*+, and Ds hadrons at central rapidity will be shown along with the first results for the measurement of the D0 and D+ nuclear modification factor and prospects for azimuthal anisotropy studies. [ABSTRACT FROM AUTHOR]

The production of resonances in pp collisions at 7 TeV using their hadronic decay was measured by the ALICE experiment at LHC. In particular, transverse momentum spectra dN/dydpT at midrapidity |y|<0.5 for K*(892)°, [lowercase_phi_synonym](1020) and |y|<0.8 for Σ(1385)± are presented and compared to model prediction. Different levels of agreement are obtained for mesons spectra, while baryonic spectrum is always underestimated. The [lowercase_phi_synonym](1020) spectra in the rapidity range (2.5

The ALICE experiment at the CERN's Large Hadron Collider allows the study of charmonium production in both e+e- and μ+μ- decay channels. In this paper, the first results obtained from reconstructing J/ψ mesons in proton-proton interactions at s = 7 TeV are discussed. The present plans for quarkonia analyses are also mentioned. [ABSTRACT FROM AUTHOR]

We evaluate the semileptonic B decays into orbitally excited charmed mesons within the framework of a constituent quark model. The calculation is performed in two steps, one which involves a semileptonic decay and the other one mediated by a strong process. Our results are in agreement with the experimental data. We also extend the study to semileptonic decays of Bs into orbitally excited charmed-strange mesons, providing predictions to the possible measurements to be carried out at LHC. [ABSTRACT FROM AUTHOR]

Studies performed by the LHCb experiment concerning decays of charmed mesons are presented, using data collected during 2010. Results are presented on: a search for CP violation in the Dalitz plot of the decay D+→K-K+π+ and its charge conjugate; measurement of the difference in the CP asymmetry (ΔACP) in the decays D0→K+K- and D0→π+π-; measurement of the CP asymmetry of the lifetime of the D0 (AΓ) in the decay D0→K+K-. [ABSTRACT FROM AUTHOR]

We report on our recent calculation of the inclusive direct photo- and hadroproduction of the J/ψ meson at next-to-leading order within the factorization formalism of nonrelativistic QCD. We fit the color-octet (CO) long-distance matrix elements , and to the transverse momentum (pT) distributions measured by CDF at Fermilab Tevatron and by H1 at DESY HERA and show that they also successfully describe the pT distributions from PHENIX at BNL RHIC and CMS at the CERN LHC as well as the photon-proton c.m. energy and (with worse agreement) the inelasticity distributions from H1. In all experiments, the CO processes are shown to be indispensable. [ABSTRACT FROM AUTHOR]