Measurement of particle production and inclusive differential cross sections in p(p)over-bar collisions at root s=1.96 TeV
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Aaltonen-2009-Measurement of parti.pdf
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Author(s)
Choudalakis, Georgios
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Hahn, Kristian Allan
Henderson, C.
Knuteson, Bruce O.
Paus, Christoph M. E.
Xie, Si
Bauer, Gerry P
Makhoul, Khaldoun
Date Issued
June 2009
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aaltonen, T. et al. “Measurement of particle production and inclusive differential cross sections in pp-bar collisions at s=1.96 TeV.” Physical Review D 79.11 (2009): 112005. (C)2010 The American Physical Society.
Version
Final published version
Abstract
We report a set of measurements of particle production in inelastic p(p)over-bar collisions collected with a minimum-bias trigger at the Tevatron Collider with the CDF II experiment. The inclusive charged particle transverse momentum differential cross section is measured, with improved precision, over a range about ten times wider than in previous measurements. The former modeling of the spectrum appears to be incompatible with the high particle momenta observed. The dependence of the charged particle transverse momentum on the event particle multiplicity is analyzed to study the various components of hadron interactions. This is one of the observable variables most poorly reproduced by the available Monte Carlo generators. A first measurement of the event transverse energy sum differential cross section is also reported. A comparison with a pythia prediction at the hadron level is performed. The inclusive charged-particle differential production cross section is fairly well reproduced only in the transverse momentum range available from previous measurements. At higher momentum the agreement is poor. The transverse energy sum is poorly reproduced over the whole spectrum. The dependence of the charged particle transverse momentum on the particle multiplicity needs the introduction of more sophisticated particle production mechanisms, such as multiple parton interactions, in order to be better explained.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevD.79.112005
