Measurement of the branching ratio and asymmetry of the decay Xi degrees -->Sigma degrees gamma.

A Alavi-Harati,R Tschirhart,J Hamm,S A Taegar,Y W Wah,E C Swallow,A Glazov,R Ford,P A Toale,P Mikelsons,M Sadamoto,B Winstein,M B Crisler,J Ladue,R J Tesarek,C Bown,V Prasad,S Bright,K Senyo,P Shanahan,A R Erwin,K Hagan,M Pang,B Quinn,L Bellantoni,E D Zimmerman,N Solomey,G Corti,A Golossanov,H G E Kobrak,K Arisaka,J Whitmore,A Roodman,E Blucher,S Averitte,A Bellavance,V Jejer,S Childress,J Wang ,S Somalwar ,I Suzuki ,G B Thomson ,K Hanagaki ,P Mcbride ,R Ben‐David ,S Hidaka ,M W Arenton ,R E Ray ,R Coleman ,S Schnetzer ,A Tripathi ,A R Barker ,A Lath ,D A Jensen ,W Slater ,T Alexopoulos ,Hoang Dai Nghia Nguyen ,E Cheu ,T Nakaya ,E Halkiadakis ,R Stone ,B Cox ,K S Nelson ,E Ramberg ,S E Turner ,D R Bergman ,A Ledovskoy ,J Belz ,R Keßler ,J Graham ,P Shawhan ,R Pordes ,R Winston ,H B White ,Joseph C Shields ,M Corcoran ,E Monnier ,Y Hsiung ,G Graham ,G J Bock ,T Yamanaka ,V O’dell

doi:10.1103/physrevlett.86.3239

Measurement of the branching ratio and asymmetry of the decay Xi degrees -->Sigma degrees gamma.

A Alavi-Harati, R Tschirhart + Show 80 more

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https://doi.org/10.1103/physrevlett.86.3239

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Journal: Physical Review Letters	Publication Date: Apr 9, 2001
Citations: 11

Affiliation: University of Wisconsin–Madison, Fermi National Accelerator Laboratory, University of Arizona, University of Chicago, Elmhurst College, University of Colorado Boulder, Osaka University, Rutgers, The State University of New Jersey, University of Virginia, University of California, San Diego, University of California, Los Angeles, Rice University

#Sigma Degrees #KTeV Experiment + Show 8 more

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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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