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Medida de la sección eficaz de producción de fotones directos aislados en colisiones pp a √s = 7 TeV en el experimento ATLAS

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Universidad Nacional de La Plata Facultad de Ciencias Exactas

Departamento de F´ısica

Tesis Doctoral

Medida de la secci´

on eficaz de producci´

on de

fotones directos aislados en colisiones pp a

√

s

= 7 TeV en el experimento ATLAS

Mart´

ın F. Tripiana

Direcci´on

Prof. Dra. Mar´ıa Teresa Dova

(2)
(3)

Resumen

Medida de la secci´on eficaz de producci´on de fotones directos aislados en colisiones pp a √

s= 7 TeV en el experimento ATLAS

Mart´ın F. Tripiana

(4)

Abstract

Measurement of the inclusive isolated prompt photon production in pp collisions at √

s= 7 TeV in the ATLAS experiment

Mart´ın F. Tripiana

The production of prompt photons at hadron colliders provides means for testing pertur-bative QCD predictions, providing a colorless probe of the hard scattering process. The measurement of the inclusive production of prompt photons could be used to constrain the parton distribution functions; in particular it is sensitive to the gluon content of the proton through the qg→ qγ subprocess, which at leading order dominates the inclusive prompt photon cross-section at the LHC. This thesis presents the measurement of the differential cross-section for the inclusive production of isolated prompt photons in pp collisions at a center-of-mass energy √s = 7 TeV. The measurement covers the pseudorapidity ranges

|η| < 1.37 and 1.52 ≤ |η| < 2.37 in the transverse energy range 45 ≤ ET < 400 GeV.

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