Exclusive production of proton-antiproton pairs in two-photon collisions

Journal Article · Tue Dec 01 00:00:00 EST 1987 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.36.3506· OSTI ID:5511806

Aihara, H; Alston-Garnjost, N M; Avery, A R.E.; Barbaro-Galtieri, A A; Barker, A A.R.; Barnett, A B.A.; Bauer, J D.A.; Bengtsson, G H; Bintinger, D D.L.; Bobbink, F G.J.

We report cross sections for the process ..gamma gamma -->..pp-bar at center-of-mass energies W from 2.0 to 2.8 GeV. These results have been extracted from measurements of e/sup +/e/sup -/..-->..e/sup +/e/sup -/pp-bar at an overall center-of-mass energy of 29 GeV, using the TPC/Two-Gamma facility at the SLAC storage ring PEP. Cross sections for the untagged mode (both photons nearly real) are shown to lie well above QCD predictions. Results are also presented for the single-tagged mode (one photon in the range 0.16<1.6 (GeV/c)/sup 2/).

• Research Organization: Lawrence Berkeley Laboratory, Berkeley, California 94720
• OSTI ID: 5511806
• Journal Information: Phys. Rev. D; (United States), Vol. 36:11
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PHOTON-PHOTON INTERACTIONS
ANNIHILATION
PROTONS
PAIR PRODUCTION
ANGULAR DISTRIBUTION
ANTIPROTONS
CALORIMETERS
CENTER-OF-MASS SYSTEM
COINCIDENCE SPECTROMETRY
CROSS SECTIONS
GEV RANGE 01-10
PEP STORAGE RINGS
PROJECTION SPARK CHAMBERS
QUANTUM CHROMODYNAMICS
ANTIBARYONS
ANTIMATTER
ANTINUCLEI
ANTINUCLEONS
ANTIPARTICLES
BARYONS
BASIC INTERACTIONS
DISTRIBUTION
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
GAS TRACK DETECTORS
GEV RANGE
HADRONS
INTERACTIONS
MEASURING INSTRUMENTS
NUCLEI
NUCLEONS
PARTICLE INTERACTIONS
QUANTUM FIELD THEORY
RADIATION DETECTORS
SPARK CHAMBERS
STORAGE RINGS
645101* - High Energy Physics- Particle Interactions &amp; Properties-Experimental- Electromagnetic Interactions &amp; Properties
645400 - High Energy Physics- Field Theory