Observation of charmed-baryon production in e/sup +/e/sup -/ annihilation

Journal Article · Mon Jan 07 00:00:00 EST 1980 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.44.10· OSTI ID:5635373

Abrams, G S; Alam, M S; Blocker, C A; Boyarski, A M; Breidenbach, M; Burke, D L; Carithers, W C; Chinowsky, W; Coles, M W; Cooper, S; Dieterle, W E; Dillon, J B; Dorenbosch, J; Dorfan, J M; Eaton, M W; Feldman, G J; Franklin, M E.B.; Gidal, G; Goldhaber, G; Hanson, G ; Hayes, K G; Himel, T; Hitlin, D G; Hollebeek, R J; Innes, W R; Jaros, J A; Jenni, P; Johnson, A D; Kadyk, J A; Lankford, A J; Larsen, R R; Longo, M J; Lueth, V; Millikan, R E; Nelson, M E; Pang, C Y; Patrick, J F; Perl, M L; Richter, B; Roussarie, A; Russell, J J; Scharre, D L; Schindler, R H; Schwitters, R F; Siegrist, J L; Strait, J; Taureg, H; Tonutti, M; Trilling, G H; Vella, E N; Vidal, R A; Videau, I; Weiss, J M; Zaccone, H

A peak in the pK/sup -/..pi../sup +/ and p-barK/sup +/..pi../sup -/ invariant-mass spectra at 2.285 +- 0.006 GeV/c/sup 2/ is observed, which is associated with the lowest-lying charmed baryon (..lambda../sub c/). A cross section times branching ratio of 0.037 +- 0.012 nb at E/sub c.m./=5.2 GeV is measured with a substantial fraction of the events produced with an equal recoiling mass. New measurements of inclusive p and ..lambda.. cross sections are also presented, allowing an estimate of the branching ratio B (..lambda../sub c/ ..-->.. pK/sup -/..pi../sup +/) =0.022 +- 0.010.

• Research Organization: Stanford Linear Accelerator Center, Stanford University, Stanford, California 94305
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5635373
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 44:1; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BARYON RESONANCES
BARYONS
BASIC INTERACTIONS
BRANCHING RATIO
CHARM PARTICLES
CHARMED BARYON RESONANCES
CROSS SECTIONS
DECAY
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GEV RANGE
GEV RANGE 01-10
HADRONS
INCLUSIVE INTERACTIONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MASS SPECTRA
MONTE CARLO METHOD
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
POSTULATED PARTICLES
QUANTUM NUMBERS
RECOILS
RESONANCE PARTICLES
SPECTRA
TIME-OF-FLIGHT METHOD
WEAK HADRONIC DECAY
WEAK PARTICLE DECAY