J/{psi} measurements in 7 TeV p-p collisions with ALICE using EMCal-triggered events

Journal Article · Mon Mar 25 00:00:00 EDT 2013 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4795973· OSTI ID:22113565

Figueredo, M. A. ^[1]

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1. Universidade de Sao Paulo (Brazil)

J/{psi} measurements can be performed with the ALICE experiment through the dilepton decay into e{sup -}e{sup +} (for rapidity Double-Vertical-Line y Double-Vertical-Line <0.9) and {mu}{sup -}{mu}{sup +} (for rapidity -4.0<-2.5) pairs, in protonproton, proton-nucleus and nucleus-nucleus collisions. Proton-proton collisions are specially important for the ALICE physics program, since they provide baseline results to be compared with Pb-Pb, where one expects the production of the Quark Gluon Plasma (QGP). Moreover, these measurements are interesting per se because the mechanism of charmonium production in hadron interactions is not yet fully understood. The ALICE Eletromagnetic Calorimeter (EMCal) p{sub T} extends the range of J/{psi} measurements, since it provides electron/hadron discrimination for higher p{sub T} values in comparison to other electron PID techniques in ALICE. The EMCal can also provide fast triggers for events containing high energy electrons. In 2011, during proton-proton collisions at 7 TeV, the ALICE EMCal trigger was intensively used for event selection of showers above 4.8 GeV. In this work, some results from 2011 proton-proton collisions are presented, showing a J/{psi} measurement for transversal momentum above 6 GeV/c, due to a combination of the ALICE EMCal PID and trigger system.

• OSTI ID: 22113565
• Journal Information: AIP Conference Proceedings, Vol. 1520, Issue 1; Conference: 12. international workshop on hadron physics, Bento Goncalves, Rio Grande do Sul (Brazil), 22-27 Apr 2012; Other Information: (c) 2013 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CASCADE SHOWERS
COMPARATIVE EVALUATIONS
ELECTRONS
GEV RANGE
HEAVY ION FUSION REACTIONS
J PSI-3097 MESONS
MULTIPARTICLE SPECTROMETERS
PARTICLE DECAY
PARTICLE IDENTIFICATION
PARTICLE RAPIDITY
POSITRONS
PROTON REACTIONS
PROTON-PROTON INTERACTIONS
PROTONS
QUARK MATTER
SHOWER COUNTERS
TEV RANGE
TRANSVERSE MOMENTUM