Abstract
The measurement of heavy-flavour production in proton-proton collisions serves as a precise test for perturbative QCD. Furthermore it provides the reference for the corresponding studies in heavy-ion collisions. The measurements are performed by ALICE in hadronic channels as well as in the semi-electronic decay channel at midrapidity, profiting from the excellent particle identification capabilities and the good impact parameter resolution, and in the semi-muonic channel at forward rapidity. In particular, electrons from beauty hadron decays can be measured at low p T by selecting electrons with a large distance to the primary vertex or by using electron-hadron correlations. Furthermore ALICE provides the unique opportunity to study the D meson yields as function of the multiplicity. We present heavy- flavour measurements in the various channels in pp collisions at √s = 7 TeV and √s = 2.76 TeV, and discuss the results by comparing them to perturbative QCD calculations.
Highlights
The measurement of the production of heavy-flavour hadrons in proton-proton collisions serves as a precise test for perturbative QCD
The measurement of heavy-flavour production in proton-proton collisions serves as a precise test for perturbative QCD
We present heavy- flavour measurements in the various channels in pp collisions at s = 7 TeV and s = 2.76 TeV, and discuss the results by comparing them to perturbative QCD calculations
Summary
The measurement of the production of heavy-flavour hadrons in proton-proton (pp) collisions serves as a precise test for perturbative QCD. It provides the reference for studies in heavy-ion collisions, where a deconfined medium, the Quark-Gluon Plasma, is supposed to be formed. The ITS helps improving the track impact parameter resolution. A good impact parameter resolution is crucial for the heavy-flavour analysis in order to separate the products from heavy-flavour hadron decays from the primary vertex and to separate the contributions from charm and beauty hadron decays, since the cτ of charm hadrons is 100 - 300 μm and the cτ of beauty hadrons is of the order of 500 μm. With the impact parameter resolution achieved (i.e. 75 μm at pT = 1 GeV/c), ALICE is well-suited for heavy-flavour measurements
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