Measurement of the branching ratio and asymmetry of the decay Xi degrees -->Sigma degrees gamma.
Phys Rev Lett
; 86(15): 3239-43, 2001 Apr 09.
Article
em En
| MEDLINE
| ID: mdl-11327940
ABSTRACT
We have studied the rare weak radiative hyperon decay Xi degrees -->Sigma degrees gamma in the KTeV experiment at Fermilab. We have identified 4045 signal events over a background of 804 events. The dominant Xi degrees -->Lambdapi degrees decay, which was used for normalization, is the only important background source. An analysis of the acceptance of both modes yields a branching ratio of B(Xi degrees -->Sigma degrees gamma)/B(Xi degrees -->Lambdapi degrees ) = (3.34+/-0.05+/-0.09)x10(-3). By analyzing the final state decay distributions, we have also determined that the Sigma degrees emission asymmetry parameter for this decay is alpha(XiSigma) = -0.63+/-0.09.
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MEDLINE
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En
Ano de publicação:
2001
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Article