Proton enhancement at large pT at the CERN large hadron collider without structure in associated-particle distribution.
The production of pions and protons in the pT range between 10 and 20 GeV/c for Pb+Pb collisions at CERN LHC is studied in the recombination model. It is shown that the dominant mechanism for hadronization is the recombination of shower partons from neighboring jets when the jet density is high. Protons are more copiously produced than pions in that pT range because the coalescing partons can have lower momentum fractions, but no thermal partons are involved. The proton-to-pion ratio can be as high as 20. When such high pT hadrons are used as trigger particles, there will not be any associated particles that are not in the background.
Hwa
Rudolph C
RC
Institute of Theoretical Science and Department of Physics, University of Oregon, Eugene, Oregon 97403-5203, USA.
Yang
C B
CB