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Measurement of the production of high-mass. gamma. gamma. ,. pi. sup 0. pi. sup 0 , and. gamma. pi. sup 0 pairs in. pi. sup minus p ,. pi. sup + p , and pp collisions at 300 GeV/ c

Journal Article · · Physical Review, D (Particles Fields); (USA)
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  1. Dipartimento di Fisica dell'Universita di Bari, Bari (Italy) Istituto Nazionale di Fisica Nucleare, Bari (Italy)
  2. University of Freiburg, Freiburg (Federal Republic of Germany)
  3. Institute of Theoretical, Moscow, (USSR) Experimental Physics, Moscow (USSR)
  4. Max-Planck-Institut fuer Physik und Astrophysik, Muenchen (Federal Republic of Germany)
+ Show Author Affiliations
The NA24 experiment at CERN investigated inclusive {gamma}{gamma}, {pi}{sup 0}{pi}{sup 0}, and {gamma}{pi}{sup 0} final states in the mass range between 4 and 9 GeV/{ital c}{sup 2} produced in {pi}{sup {minus}}{ital p}, {pi}{sup +}{ital p}, and {ital pp} reactions at a c.m.-system energy {radical}{ital s} =23.7 GeV. The {pi}{sup 0}{pi}{sup 0} cross sections agree well with expectations of the quark-parton model. For {gamma}{pi}{sup 0} production in {pi}{sup {minus}}{ital p} and {ital pp} reactions, a clear signal is observed and cross sections are shown. The production of {gamma}{gamma} events was observed with a statistical significance of 2.9{sigma} in {pi}{sup {minus}}{ital p} reactions. The cross section is in agreement with a higher-order QCD prediction.
OSTI ID:
6589605
Journal Information:
Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 42:3; ISSN PRVDA; ISSN 0556-2821
Country of Publication:
United States
Language:
English

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Related Subjects

645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BARYON-BARYON INTERACTIONS
BOSONS
CERN SPS SYNCHROTRON
COMPOSITE MODELS
COUPLING CONSTANTS
CROSS SECTIONS
CYCLIC ACCELERATORS
ELEMENTARY PARTICLES
ENERGY RANGE
FIELD THEORIES
GEV RANGE
GEV RANGE 100-1000
HADRON-HADRON INTERACTIONS
HADRONS
INCLUSIVE INTERACTIONS
INTERACTIONS
LINEAR MOMENTUM
MASSLESS PARTICLES
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
MULTIWIRE PROPORTIONAL CHAMBERS
NUCLEON-NUCLEON INTERACTIONS
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTON MODEL
PHOTONS
PION MINUS-PROTON INTERACTIONS
PION PLUS-PROTON INTERACTIONS
PION-NUCLEON INTERACTIONS
PION-PROTON INTERACTIONS
PIONS
PIONS NEUTRAL
PROPORTIONAL COUNTERS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
RADIATION DETECTORS
SCINTILLATION COUNTERS
SYNCHROTRONS
TRANSVERSE MOMENTUM