Amplitude analysis of reaction K sup + n sub up arrow r arrow K sup +. pi. sup minus p at 5. 98 GeV/ c

Journal Article · Sun Mar 01 04:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.1518· OSTI ID:7206029

Svec, M ^[1]; de Lesquen, A; van Rossum, L ^[2]

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1. Physics Department, Dawson College, Montreal, Quebec, H3Z 1A4 (Canada) McGill University, Montreal, Quebec, H3A 2T8 (Canada)
2. Departement de Physique des Particules Elementaires, Centre d'Etudes Nucleaires, Saclay (France)

We present a model-independent amplitude analysis of the reaction {ital K}{sup +}{ital n}{sub {up arrow}}{r arrow}{ital K}{sup +}{pi}{sup {minus}}{ital p} at 5.98 GeV/{ital c} using Saclay data obtained with a transversely polarized deuteron target at the CERN Proton Synchrotron. The analysis makes use of the data in two sets of binnings to examine the dependence of amplitudes on momentum transfer {ital t} ({minus}{ital t}{le}1.0 (GeV/{ital c}){sup 2}) in the {ital K}{sup *0} mass region, and their dependence on {ital K}{sup +}{pi}{sup {minus}} invariant mass below 1000 MeV for momentum transfers {minus}{ital t}=0.2--0.4 (GeV/{ital c}){sup 2}. The analysis is performed in both {ital t}-channel and {ital s}-channel helicity frames of the dimeson state. The data yield two solutions for 8 moduli and 6 cosines of relative phases of nucleon transversity amplitudes with dimeson spins {ital J}=0 ({ital S} wave) and {ital J}=1 ({ital P} wave). The two solutions differ mainly in the contributions of the {ital S} wave. Both solutions require nonzero nucleon helicity-flip amplitudes. The differences in the moduli of the amplitudes with a recoil nucleon transversity up'' and down'' reveal the essential role of nucleon spin in the pion production process. The {ital P}-wave moduli show unexpected structures within the {ital K}{sup *0} mass range which provide new information on {ital K}{sup *0} production. The mass dependence of solution 2 suggests the possible existence of a scalar state {ital I}=1/2 0{sup +} (887) with a width of about 20 MeV. We comment on its possible constituent structure. Our results emphasize the need for a systematic study of pion production on the level of amplitudes in a new generation of dedicated experiments with spin at the recently proposed advanced hadron facilities.

• OSTI ID: 7206029
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 45:5; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662240 -- Models for Strong Interactions-- (1992-)
662340* -- Hadron Interactions-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ANGULAR MOMENTUM
BARYONS
BOSONS
COMPOSITE MODELS
DEUTERIUM
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GEV RANGE
GEV RANGE 01-10
HADRON-HADRON INTERACTIONS
HADRONS
HELICITY
HYDROGEN ISOTOPES
INTERACTIONS
ISOTOPES
KAON PLUS-NEUTRON INTERACTIONS
KAON-NEUTRON INTERACTIONS
KAON-NUCLEON INTERACTIONS
LIGHT NUCLEI
MATHEMATICAL MODELS
MATRIX ELEMENTS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
MOMENTUM TRANSFER
NUCLEI
NUCLEONS
ODD-ODD NUCLEI
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PIONS
PIONS MINUS
POLARIZED TARGETS
PROTONS
PSEUDOSCALAR MESONS
QUARK MODEL
S CHANNEL
SCATTERING AMPLITUDES
SPIN
STABLE ISOTOPES
T CHANNEL
TARGETS