Evidence for. rho. sub 1 (1270) production in the reaction K sup minus p yields. pi. sup +. pi. sup minus. Lambda

Conference · Sat Dec 01 04:00:00 EST 1990

OSTI ID:6312816

Aston, D; Bienz, T; Bird, F; Dunwoodie, W; Johnson, W; Kunz, P; Kwon, Y; Leith, D; Levinson, L; Ratcliff, B; Rensing, P; Schultz, D; Shapiro, S; Sinervo, P; Tarnopolsky, G; Toge, N; Waite, A; Williams, S ^[1]; Awaji, N; Fujii, K ; Hayashii, H; Iwata, S; Kajikawa, R; Matsui, T; Miyamoto, A; Ozaki, H; Pak, C; Shimomura, T; Sugiyama, A; Suzuki, S

---

1. Stanford Linear Accelerator Center, Menlo Park, CA (USA)

Preliminary results are presented from an analysis of the {pi}{sup +}{pi}{sup {minus}} system produced in the reaction {Kappa}{sup {minus}}p {yields} {pi}{sup +}{pi}{sup {minus}} {Lambda} at 11 GeV/c observed with the LASS spectrometer at SLAC. A clear {rho} --{minus} {omega} interference effect is observed, and a fit to the natural parity exchange mass distribution yields a branching fraction estimate of (1.7 {plus minus} 0.5) % for the decay {omega} {yields}{pi}{sup +}{pi}{sup {minus}}. An amplitude analysis reveals that the bump in the mass distribution in the vicinity of the f{sub 2}(1270) actually contains a significant P-wave component. The mass dependence of the corresponding amplitude and phase is well described by a resonant Breit-Wigner line-shape with mass (1266 {plus minus} 14) MeV/c{sup 2}, width (166 {plus minus} 35) MeV/c{sup 2}, and estimated elasticity {approximately} 5%. The interpretation of this state as the first radial excitation of the {rho}(770) is discussed. 15 refs., 5 figs.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (USA)
• Sponsoring Organization: DOE/ER; NSF
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 6312816
• Report Number(s): SLAC-PUB-5392; CONF-9009309--4; ON: DE91005758; CNN: PHY82-09144; PHY85-13808
• 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
BARYONS
BOSONS
BRANCHING RATIO
ELEMENTARY PARTICLES
FERMIONS
FINAL-STATE INTERACTIONS
HADRON-HADRON INTERACTIONS
HADRONS
HYPERONS
INTERACTIONS
KAON MINUS-PROTON INTERACTIONS
KAON-NUCLEON INTERACTIONS
KAON-PROTON INTERACTIONS
LAMBDA BARYONS
LAMBDA PARTICLES
MASS SPECTRA
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
RHO-1250 MESONS
SPECTRA
STRANGE PARTICLES
VECTOR MESONS