Charged particle transverse momentum spectra in pp collisions at sqrt {s} = 0.9 and 7 TeV
Abstract
The charged particle transverse momentum ( p T) spectra are presented for pp collisions at sqrt {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 μb-1 and 2.96 pb-1, respectively. Calorimeter-based high-transverse-energy triggers are employed to enhance the statistical reach of the high- p T measurements. The results are compared with leading and next-to-leading order QCD and with an empirical scaling of measurements at different collision energies using the scaling variable {x_{text{T}}} equiv {{{2{p_{text{T}}}}} left/ {{sqrt {s} }} right.} over the p T range up to 200 GeV/ c. Using a combination of x T scaling and direct interpolation at fixed p T, a reference transverse momentum spectrum at sqrt {s} = 2.76 TeV is constructed, which can be used for studying high- p T particle suppression in the dense QCD medium produced in heavy-ion collisions at that centre-of-mass energy.
- Publication:
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Journal of High Energy Physics
- Pub Date:
- August 2011
- DOI:
- 10.1007/JHEP08(2011)086
- arXiv:
- arXiv:1104.3547
- Bibcode:
- 2011JHEP...08..086C
- Keywords:
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- Hadron-Hadron Scattering;
- High Energy Physics - Experiment
- E-Print:
- JHEP 08 (2011) 086