Published June 1991 | Version v1
Journal article Metadata-only

Evidence for ρ1(1270) production in the reaction K-p→π+π-Λ

Creators

  • 1. Stanford Linear Accelerator Center, CA (USA)
  • 2. Nagoya Univ., Chikusa (Japan). Dept. of Physics
  • 3. Cincinnati Univ., OH (USA). Dept. of Physics
  • 4. Tokyo Univ., Tanashi (Japan). Inst. for Nuclear Study

Description

Preliminary results are presented from an analysis of the π+π- system produced in the reaction K-p → π+π- Λ at 11 GeV/c observed with the LASS spectrometer at SLAC. A clear ρ - ω interference effect is observed, and a fit to the natural parity exchange mass distribution yields a branching fraction estimate of (1.7 ± 0.5)% for the decay ω → π+π-. An amplitude analysis reveals that the bump in the mass distribution in the vicinity of the f2(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 ± 14) MeV/c2, width (166 ± 35) MeV/c2, and estimated elasticity ≅ 5%. The interpretation of this state as the first radial excitation of the ρ(770) is discussed. (orig.)

Additional details

Publishing Information

Journal Title
Nuclear Physics. B, Proceedings Supplements
Journal Volume
21
Series
Nucl. Phys., B Proc. Suppl.
Journal Page Range
105-110
ISSN
0920-5632
CODEN
NPBSE

Conference

Title
Rheinfels workshop on hadron mass spectrum.
Dates
3-6 Sep 1990.
Place
St. Goar (Germany).

INIS

Country of Publication
Netherlands
Country of Input or Organization
Netherlands
INIS RN
23003291
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator
Conference, Numerical Data
Descriptors DEI
BRANCHING RATIO; BREIT-WIGNER FORMULA; CHARGE-EXCHANGE INTERACTIONS; D WAVES; DALITZ PLOT; EFFECTIVE MASS; EXPERIMENTAL DATA; GEV RANGE 10-100; HADRONIC PARTICLE DECAY; INELASTIC SCATTERING; INTERFERENCE; KAON MINUS-PROTON INTERACTIONS; LAMBDA PARTICLES; MASS SPECTRA; OMEGA-783 MESONS; P WAVES; PAIR PRODUCTION; PARTICLE WIDTHS; PIONS MINUS; PIONS PLUS; REST MASS; RHO-1250 MESONS; RHO-770 MESONS; SCATTERING AMPLITUDES; VIBRATIONAL STATES
Descriptors DEC
AMPLITUDES; BARYONS; BASIC INTERACTIONS; BOSONS; DATA; DECAY; DIAGRAMS; ELEMENTARY PARTICLES; ENERGY LEVELS; ENERGY RANGE; EXCITED STATES; FERMIONS; GEV RANGE; HADRON-HADRON INTERACTIONS; HADRONS; HYPERONS; INFORMATION; INTERACTIONS; KAON-NUCLEON INTERACTIONS; KAON-PROTON INTERACTIONS; LAMBDA BARYONS; MASS; MESON-BARYON INTERACTIONS; MESON-NUCLEON INTERACTIONS; MESONS; NUMERICAL DATA; PARTIAL WAVES; PARTICLE DECAY; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PARTICLE PROPERTIES; PIONS; PSEUDOSCALAR MESONS; SCATTERING; SCATTERPLOTS; SPECTRA; STRANGE PARTICLES; STRONG INTERACTIONS; VECTOR MESONS

Optional Information

Contract/Grant/Project number
Contract DE-AC03-76SF00515; Grant PHY-82-09144; PHY-85-13808