J/ψ production cross section and its dependence on charged-particle multiplicity in p + p collisions at s=200 GeV

Multiplicity dependence of inclusive p(t) spectra from p-p collisions at root s=200 GeV

M ay 2 01 0 Υ cross section in p + p collisions at √ s = 200 GeV

We report on a measurement of the Υ(1S+2S+3S) → e + e − cross section at midrapidity in p + p collisions at √ s = 200 GeV. We find the cross section to be 114 ± 38 (stat. + fit) +23 −24 (syst.) pb. Perturbative QCD calculations at next-to-leading order in the Color Evaporation Model are in agreement with our measurement, while calculations in the Color Singlet Model underestimate it by 2σ. Our ...

gamma cross section in p plus p collisions at root s=200 GeV

Charged - Particle Multiplicity near Midrapidity in Central Au 1 Au Collisions at p sNN 5 56 and 130 GeV

B. B. Back,1 M. D. Baker,2 D. S. Barton,2 S. Basilev,5 B. D. Bates,5 R. Baum,9 R. R. Betts,1,7 A. Białas,4 R. Bindel,8 W. Bogucki,3 A. Budzanowski,3 W. Busza,5 A. Carroll,2 M. Ceglia,2 Y.-H. Chang,6 A. E. Chen,6 T. Coghen,3 C. Conner,7 W. Czyż,4 B. Da̧browski,3 M. P. Decowski,5 M. Despet,3 P. Fita,5 J. Fitch,5 M. Friedl,5 K. Gałuszka,3 R. Ganz,7 E. Garcia,8 N. George,1 J. Godlewski,3 C. Gomes,5 ...

Charged Particle Production at High Rapidity in p+p Collisions at RHIC

This report describes the recent analysis of identified charged particle production at high rapidity performed on data collected from p+p collisions at RHIC ( √ s = 200GeV). The extracted invariant cross-sections compare well to NLO pQCD calculations. However, a puzzling high yield of protons at high rapidity and pT has been found. INTRODUCTION The p+p system is used in many cases as a paradigm...