Weak radiative decay [Lambda][r arrow][ital n][gamma] and the radiative capture reaction [ital K][sup [minus]][ital p][r arrow][Sigma](1385)[gamma]

Journal Article · Mon Feb 01 04:00:00 EST 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.47.799· OSTI ID:6818840

Larson, K D; Noble, A J; Bassalleck, B; Burkhardt, H; Fickinger, W J; Hall, J R; Hallin, A L; Hasinoff, M D; Horvath, D; Jones, P G; Lowe, J; McIntyre, E K; Measday, D F; Miller, J P; Roberts, B L; Robinson, D K; Sakitt, M; Salomon, M; Stanislaus, S; Waltham, C E ; Warner, T M; Whitehouse, D A; Wolfe, D M ^[1]

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1. University of Birmingham; Birmingham; B15 2TT (United Kingdom) Boston University; Boston; Massachusetts 02215 (United States) University of British Columbia; Vancouver; British Columbia; V6T 1Z1 (Canada) Brookhaven National Laboratory; Upton; New York 11973 (United States) Case Western Reserve University; Cleveland; Ohio 44106 (United States) Central Research Institute for Physics; H-1525 Budapest (Hungary) Los Alamos Meson Physics Facility; Los Alamos; New Mexico 87545 (United States) University of New Mexico; Albuquerque; New Mexico 87131 (United States) University of Nottingham; Nottingham; NG7 2RD (United Kingdom) Princeton University; Princeton; New Jersey

The branching ratio for the [Lambda] weak radiative decay [Lambda][r arrow][ital n][gamma] has been measured. Three statistically independent results from the same experiment (Brookhaven E811) are reported here. They are combined with a previously published measurement, also from Brookhaven E811, to yield a result of ([Lambda][r arrow][ital n][gamma])/([Lambda][r arrow]anything)=(1.75[plus minus]0.15)[times]10[sup [minus]3], based on 1800 events after background subtraction. This represents a factor of 75 increase in statistics over the previous world total. A comparison with recent theoretical papers shows that no existing model provides a completely satisfactory description of all data on weak radiative decays. A search is also reported for the radiative capture process [ital K][sup [minus]][ital p][r arrow][Sigma](1385)[gamma] at rest. No signal was observed and an upper limit on the branching ratio of [[ital K][sup [minus]][ital p][r arrow][Sigma](1385)[gamma]]/[[ital K][sup [minus]][ital p][r arrow]anything][lt]4[times]10[sup [minus]4] (90% C.L.) was determined.

• OSTI ID: 6818840
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 47:3; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662340* -- Hadron Interactions-- (1992-)
662360 -- Decays of Baryons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
BOSONS
BRANCHING RATIO
CAPTURE
DECAY
ELEMENTARY PARTICLES
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
HYPERONS
INTERACTIONS
KAON MINUS-PROTON INTERACTIONS
KAON-NUCLEON INTERACTIONS
KAON-PROTON INTERACTIONS
LAMBDA BARYONS
MASSLESS PARTICLES
MATRIX ELEMENTS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
NEUTRONS
NUCLEONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTONS
PIONS
PIONS NEUTRAL
POLARIZED PRODUCTS
PSEUDOSCALAR MESONS
RADIATIVE DECAY
SIGMA BARYONS
SIGMA-1385 BARYONS
STRANGE PARTICLES