First Observation of the DecayKL→π0e+e−γ

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

doi:10.1103/physrevlett.87.021801

First Observation of the DecayKL→π0e+e−γ

A Alavi-Harati, P Mikelsons + Show 81 more

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https://doi.org/10.1103/physrevlett.87.021801

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Journal: Physical Review Letters	Publication Date: Jun 25, 2001
Citations: 5

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

#Calculations In Chiral Perturbation Theory #Decay KL + Show 8 more

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Abstract

We report on the first observation of the decay KL -> pi0 ee gamma by the KTeV E799 experiment at Fermilab. Based upon a sample of 48 events with an estimated background of 3.6 +/- 1.1 events, we measure the KL -> pi0 ee gamma branching ratio to be (2.34 +/- 0.35 +/- 0.13)x10^{-8}. Our data agree with recent O(p^6) calculations in chiral perturbation theory that include contributions from vector meson exchange through the parameter a_V. A fit was made to the KL -> pi0 ee gamma data for a_V with the result -0.67 +/- 0.21 +/- 0.12, which is consistent with previous results from KTeV.

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