Energy dependence of p-bar/p ratio in p+p collisions

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.044902· OSTI ID:21419629

Singha, Subhash; Mohanty, Bedangadas ^[1]; Netrakanti, Pawan Kumar ^[2]; Kumar, Lokesh ^[3]

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1. Variable Energy Cyclotron Centre, Kolkata 700 064 (India)
2. Bhabha Atomic Research Centre, Mumbai 400 085 (India)
3. Kent State University, Kent, Ohio 44242 (United States)

We compiled the experimentally measured p-bar/p ratio at midrapidity in p+p collisions from {radical}(s)=23 to 7000 GeV and compared it to various mechanisms of baryon production as implemented in the pythia, phojet, and Heavy Ion Jet Interaction Generator (HIJING)/B-B models. For the models studied with default settings, phojet has the best agreement with the measurements, pythia gives a higher value for {radical}(s)<200 GeV, and the ratios from HIJING/B-B are consistently lower for all the {radical}(s) studied. A comparison of the data to different mechanisms of baryon production as implemented in pythia shows that through a suitable tuning of the suppression of diquark-antidiquark pair production in the color field relative to quark-antiquark production and allowing the diquarks to split according to the popcorn scheme, a fairly reasonable description of the measured p-bar/p ratio for {radical}(s)<200 GeV is given. A comparison of the beam energy dependence of the p-bar/p ratio in p+p and nucleus-nucleus (A + A) collisions at midrapidity shows that the baryon production is significantly more for A + A collisions relative to p+p collisions for {radical}(s)<200 GeV. We also carry out a phenomenological fit to the y{sub beam} dependence of the p-bar/p ratio.

• OSTI ID: 21419629
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 82, Issue 4; Other Information: DOI: 10.1103/PhysRevC.82.044902; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANTIPROTONS
ATOM-ATOM COLLISIONS
BEAMS
COLLISIONS
COLOR MODEL
COMPARATIVE EVALUATIONS
ENERGY DEPENDENCE
GEV RANGE
HEAVY IONS
PAIR PRODUCTION
PROTON-PROTON INTERACTIONS
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ANTIMATTER
ANTINUCLEI
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CHARGED PARTICLES
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ELEMENTARY PARTICLES
ENERGY RANGE
EVALUATION
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
IONS
MATHEMATICAL MODELS
MATTER
NUCLEI
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PROTON-NUCLEON INTERACTIONS
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QUARK MODEL