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Paper IPM / Particles / 11880

School of Particles and Accelerator

Title:

Charged particle transverse momentum spectra in pp collisions at p sqrt(s) = 0.9 and 7 TeV

Author(s):

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

Status:

Submitted

Journal:

High Energy Physics

Year:

2011

Supported by:

IPM

Abstract:

The charged particle transverse momentum (pT) spectra are presented for pp collisions at aqrt(s) = 0.9 and 7 TeV. The data samples were collected with the CMS detector at the LHC and correspond to integrated luminosities of 231 mb1 and 2.96 pb(-1), respectively. Calorimeter-based high- ransverse-energy triggers are employed to enhance the statistical reach of the high-pT measurements. The results are compared with both leading-order QCD and with an empirical scaling of measurements at different collision energies using the scaling variable xT 2pT/ps over the pT range up to 200 GeV/c. Using a combination of xT scaling and direct interpolation at fixed pT,a reference transverse momentum spectrum at sqrt(s) = 2.76 TeV is constructed, which can be used for studying high-pT particle suppression in the dense QCD medium produced in heavy-ion collisions at that centre-of-mass energy

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