Measurement of the mass differencem(Ds+)−m(D+)<

Measurement of heavy-flavour production in proton–proton collisions at with ALICE

“…State-of-the-art implementations of perturbative QCD calculations describe well the beauty production cross section measured in pp collisions at √ s = 1.96 TeV at the Tevatron [4]. Also the production of charm hadrons (D mesons) is reproduced within the theoretical uncertainties of the calculation [5]. However, in this case the comparison suggests that charm production is slightly underestimated in the calculations, as observed also in pp collisions at RHIC at the much lower √ s = 0.2 TeV [6,7].…”

“…Left: D 0 /D + ratio for p t > 3 GeV/c, compared to previous measurements; the ratios for the other experiments have been calculated using the data in Refs [15,5]…”

Heavy-flavour production in Pb–Pb collisions at the LHC, measured with the ALICE detector

“…For D mesons, the procedure was validated by scaling the ALICE data to Tevatron energy, √ s = 1.96 TeV, and comparing [15] to CDF measurements [16]. The D 0 and D + cross sections were measured, though with limited precision of 20-25% and p t < 8 GeV/c, also for pp collisions at √ s = 2.76 TeV collected during a short reference run at the same energy as Pb-Pb collisions.…”

Study of the heavy molecular states in the quark model with meson exchange interaction

“…Some recently discovered narrow charmoniumlike resonances have aroused great theoretical interest. The typical X(3872) state, which was discovered by the Belle Collaboration [1] and subsequently confirmed by the CDF Collaboration [2] and BABAR Collaboration [3], is summarized M X = 3872.2 ± 0.8MeV, Γ X = 3.0 +1.9 −1.4 ± 0.9MeV [4]. Previously its quantum numbers were inferred most probably J P C = 1 ++ , while the masses of the corresponding charmonium states in the quark model 2 3 P 1 or 3 3 P 1 are hundreds MeV above M X .…”