Experimental study of the reactions p p r arrow. pi. sup minus. pi. sup + and K sup minus K sup + between 360 and 760 MeV/ c

Journal Article · Thu Feb 01 04:00:00 EST 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.41.744· OSTI ID:7243649

Tanimori, T; Ishimoto, S; Nakamura, K; Tanaka, K H ^[1]; Sudou, M; Homma, S ^[2]; Sugimoto, Y ^[3]; Fujii, T ^[4]; Fujii, Y ^[5]; Kohno, S; Morita, Y; Sumi, Y ^[6]

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1. National Laboratory for High Energy Physics, Oho, Ibaraki 305, (Japan)
2. Institute for Nuclear Study, University of Tokyo, Tanashi, Tokyo 188, (Japan)
3. Department of Physics, Kyoto University, Kyoto 606, (Japan)
4. Department of Physics, University of Tokyo, Tokyo 113, (Japan) Department of Physics, Kobe University, Kobe 657, (Japan)
5. Laboratory of Nuclear Science, Tohoku University, Sendai 982, (Japan)
6. Department of Physics, Hiroshima University, Hiroshima 730, (Japan)

The folded differential cross sections {ital d}{sigma}/{ital d}{Omega}({theta}{sup *})+d{sigma}/d{Omega}({pi}{minus}{theta}{sup *}), where {theta}{sup *} is the center-of-mass angle of the negatively charged outgoing particle, have been measured for the reactions {ital {bar p}p}{r arrow}{pi}{sup {minus}}{pi}{sup +} and {ital K}{sup {minus}}{ital K}{sup +} at 15 incident beam momenta between 360 and 760 MeV/{ital c} with much better statistics than previous experiments. The total cross sections for these reactions, {sigma}{sub {pi}{sup {minus}}{pi}{sup +}} and {sigma}{sub {ital K}{sup {minus}}{ital K}{sup +}}, have also been obtained by integrating the folded differential cross sections. The folded differential cross sections of both reactions show a similar behavior at all measured beam momenta, characterized by a prominent peak at {vert bar}cos{theta}{sup *}{vert bar}=1. The cross section {sigma}{sub {pi}{sup {minus}}{pi}{sup +}} shows a smooth but rapidly decreasing behavior as the beam momentum increases up to 550 MeV/{ital c}, whereas {sigma}{sub {ital K}{sup {minus}}{ital K}{sup +}} shows a smooth and flat momentum dependence. These results are compared with some theoretical calculations based on nonrelativistic quark models. Although the shape of the folded differential cross section of the {ital {bar p}p}{r arrow}{pi}{sup {minus}}{pi}{sup +} reaction is rather well reproduced by these models, that of the {ital {bar p}p}{r arrow}{ital K}{sup {minus}}K{sup +} reaction, and, in particular, the prominent peak at {vert bar}cos{theta}{sup *}{vert bar}=1 cannot be explained at all. The information from other experiments indicates that this discrepancy is most pronounced at the backward angles. Moreover, the momentum dependence of both {sigma}{sub {pi}{sup {minus}}{pi}{sup +}} and {sigma}{sub {ital K}{sup {minus}}{ital K}{sup +}} is not satisfactorily reproduced by these models.

• OSTI ID: 7243649
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 41:3; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ANNIHILATION
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
BOSONS
BUBBLE CHAMBERS
COMPOSITE MODELS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
GAS TRACK DETECTORS
HADRON-HADRON INTERACTIONS
HADRONS
INFORMATION
INTERACTIONS
KAONS
KAONS MINUS
KAONS PLUS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MESONS
MEV RANGE
MEV RANGE 100-1000
NUCLEON-ANTINUCLEON INTERACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PIONS
PIONS MINUS
PIONS PLUS
PROTON-ANTIPROTON INTERACTIONS
PSEUDOSCALAR MESONS
QUANTUM NUMBERS
QUARK MODEL
RADIATION DETECTORS
SELECTION RULES
STRANGE MESONS
STRANGE PARTICLES
TOTAL CROSS SECTIONS