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A Measurement of the Branching Ratio for the $\Sigma^+ \to P \gamma$ Decay

Authors
  • Hessey, N.P.
  • Booth, E.C.
  • Fickinger, W.J.
  • Gall, K.P.
  • Hasinoff, M.D.
  • Horvath, D.
  • Lowe, J.
  • Mcintyre, E.K.
  • Measday, David F.
  • Miller, J.P.
  • Noble, A.J.
  • Roberts, B.L.
  • Robinson, D.K.
  • Sakitt, M.
  • Salomon, M.
  • Whitehouse, D.A.
Publication Date
Jan 01, 1989
Identifiers
DOI: 10.1007/BF01555854
OAI: oai:inspirehep.net:283998
Source
INSPIRE-HEP
Keywords
License
Unknown
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Abstract

We have measured the weak radiative decay branching ratio (∑+ →pγ)/(∑+ →pπ0). The experiment was carried out at Brookhaven National Laboratory using a low-energy separatedK− beam stopping in liquid hydrogen. The∑+ was tagged by observing the pion fromK−K+p→∑+π− in a range telescope, and the gamma was detected in a segmented NaI detector. The result is (2.81±0.39−0.43+0.21)×10−3, which is consistent with previous measurements. This corresponds to a branching ratio for (∑+ →pγ)/(∑+ → all) of (1.45±0.20−0.22+0.11)×10−3, where the quoted errors are statistical and systematic, respectively. A total of 408 signal events were observed, doubling the previous world total.

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