Münster 2017 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 2: Heavy Ion Collisions and QCD Phases I
HK 2.5: Vortrag
Montag, 27. März 2017, 18:00–18:15, F 1
Transverse momentum distributions of charged-particles in pp collisions with ALICE at the LHC — •Edgar Perez Lezama for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt am Main — Research Division and ExtreMe Matter Institute, GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt
The charged-particle transverse momentum spectrum is an important observable for testing pQCD (perturbative QCD) calculations and serves as a reference for Pb-Pb collisions to study QGP bulk properties. The measurement of inclusive production of charged-particles in high-energy proton-proton collisions and its evolution with the event multiplicity is also a key observable to test models of particle production. In 2015, pp collisions at √s = 13 TeV and √s = 5.02 TeV were recorded using the ALICE detector at the LHC. With the increase in collision energy, the role of hard processes (parton scatterings with large momentum transfer) increases and offers the possibility to understand the interplay between soft and hard processes of particle production. The measurement of the charged-particle spectrum at 5.02 TeV is used in the construction of the nuclear modification factor (RAA). In this talk, the transverse momentum distributions measured with ALICE at a collision energy of √s = 13 TeV , √s = 5.02 TeV in pp collisions and the reanalysis of the data at √s = 2.76 TeV will be presented as well as comparisons to models and previous ALICE measurements.