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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:   Published
Journal: JHEP
No.:  086
Vol.:  1108
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