Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Heavy Ion Collision and QCD Phases X

HK 48.3: Vortrag

Donnerstag, 17. März 2016, 14:45–15:00, S1/01 A01

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 — Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt

The charged-particle transverse momentum spectrum is an important observable for understanding quantum chromo-dynamics (QCD), theory of strong interactions in proton-proton collisions. In 2015 pp collisions at √s = 13 TeV and √s = 5 TeV were recorded using the ALICE detector at the LHC. The measurement of inclusive production of charged-particles in high-energy proton-proton collisions and its evolution with the event multiplicity is a key observable to characterize the global properties of the collision. With the increase in collision energy, the role of hard processes (parton scatterings with large momentum transfer) in final state particle production rapidly increases and offers the possibility to further constrain particle production models. The reach of the maximum beam energy of the Large Hadron Collider (LHC) allows the study of pp collisions over a wide range of centre-of-mass energy, and specifically the measurement of charged-particle spectrum at 5 TeV plays a key role in the construction of the nuclear modification factor (R_AA). In the talk transverse momentum distributions measured with ALICE at a collision energy of √s = 13 TeV and √s = 5 TeV in pp collisions will be presented. Results will be compared to models and to the previous ALICE measurements at other energies.