Coupled-channels study of antiproton-proton reactions

Journal Article · Thu Feb 01 04:00:00 EST 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.41.665· OSTI ID:7103008

Liu, G Q; Tabakin, F ^[1]

---

1. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (US)

Low energy antiproton-proton elastic, charge exchange, charged pion, and charged kaon production reactions are studied in a coupled-channels model. The need for a coupled-channels approach to antiproton-proton reactions is first demonstrated. Meson exchange potentials describe the long-range {ital {bar N}N} interaction; smooth phenomenological forms are used for the {ital {bar N}N} interaction at short distances. Effective channels are introduced to simulate strong absorptive effects, such as multimeson production processes. Transition potentials for kaon and pion production are derived in coordinate space and shown to include an important spin-times-derivative coupling form. These transition potentials, along with a one-boson-exchange model with effective absorptive channels, are used to determine the role of multistep processes of the type {bar {pi}}{pi}{leftrightarrow}{ital {bar p}p}{leftrightarrow}{ital {bar n}n}{leftrightarrow}{ital {bar K}K}. Control over such coupled-channels effects is sought as a step toward unfolding short-distance quark effects in a reliable way. The {ital {bar p}p} elastic and charge exchange differential cross sections at three {ital {bar p}p} laboratory momenta (780, 690, and 590 MeV/{ital c}) are examined first, since {pi}{sup {minus}}{pi}{sup +} and {ital K}{sup {minus}}K{sup +} data also exist at these energies. Results are then presented that manifest strong coupling effects, especially between the pion and kaon production channels. Based on that result, a full coupled-channels fit to the {ital {bar p}p}, {ital {bar n}n}, {ital K}{sup {minus}}{ital K}{sup +}, and {pi}{sup {minus}}{pi}{sup +} data is presented and analyzed.

• OSTI ID: 7103008
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 41:2; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

645204* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON-BARYON INTERACTIONS
BASIC INTERACTIONS
BOSONS
CHARGE-EXCHANGE INTERACTIONS
COUPLED CHANNEL THEORY
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ELEMENTARY PARTICLES
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
KAONS
KAONS MINUS
KAONS PLUS
MESONS
NUCLEON-ANTINUCLEON INTERACTIONS
PARTIAL WAVES
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PIONS
PIONS MINUS
PIONS PLUS
PROTON-ANTIPROTON INTERACTIONS
PSEUDOSCALAR MESONS
SCATTERING
STRANGE MESONS
STRANGE PARTICLES
STRONG INTERACTIONS
TOTAL CROSS SECTIONS