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Paper IPM / Particles / 12095

School of Particles and Accelerator

Title:

Measurement of the Differential Cross Section for Isolated Prompt Photon Production in pp Collisions at 7 TeV

Author(s):

1 .	Hessamadin Arfaei
2 .	Hamed Bakhshiansohi
3 .	Seyed Mohsen Etesami
4 .	Ali Fahim
5 .	Majid Hashemi
6 .	Hoda Hesari
7 .	Abideh Jafari
8 .	Mohsen Khakzad
9 .	A Mohammadi
10 .	Mojtaba Mohammadi Najafabadi
11 .	Saeid Paktinat
12 .	Batool Safarzadeh
13 .	Maryam Zeinali

Status:

Published

Journal:

Phys. Rev. D

No.:

052011

Vol.:

Year:

2011

Supported by:

IPM

Abstract:

A measurement of the differential cross section for the inclusive production of isolated prompt photons in proton-proton collisions at a centre-of-mass energy of 7 TeV is presented. The data sample corresponds to an integrated luminosity of 36 pb-1 recorded by the CMS detector at the LHC. The measurement covers the pseudorapidity range jhj < 2.5 and the transverse energy range 25 < ET < 400 GeV, corresponding to the kinematic region 0.007 < xT < 0.114. Photon candidates are identified with two complementary methods, one based on photon conversions in the silicon tracker and the other on isolated energy deposits in the electromagnetic calorimeter. The measured cross section is presented as a function of ET in four pseudorapidity regions. The next-to-leading-order perturbative QCD calculations are consistent with the measured cross section

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