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Measurement of the branching ratio and form factor of K(L)-->mu(+)mu(-)gamma
Authors:Alavi-Harati A  Alexopoulos T  Arenton M  Arisaka K  Averitte S  Barker A R  Bellantoni L  Bellavance A  Belz J  Ben-David R  Bergman D R  Blucher E  Bock G J  Bown C  Bright S  Cheu E  Childress S  Coleman R  Corcoran M D  Corti G  Cox B  Crisler M B  Erwin A R  Ford R  Glazov A  Golossanov A  Graham G  Graham J  Hagan K  Halkiadakis E  Hamm J  Hanagaki K  Hidaka S  Hsiung Y B  Jejer V  Jensen D A  Kessler R  Kobrak H G  LaDue J  Lath A  Ledovskoy A  McBride P L  Mikelsons P  Monnier E  Nakaya T  Nelson K S  Nguyen H  O'Dell V  Pang M  Pordes R  Prasad V  Quinn B  Ramberg E J  Ray R E  Roodman A  Sadamoto M  Schnetzer S  Senyo K  Shanahan P
Affiliation:University of Wisconsin, Madison, Wisconsin 53706, USA.
Abstract:We report on the analysis of the rare decay K(L)-->mu(+)mu(-)gamma the 1997 data from the KTeV experiment at Fermilab. A total of 9327 candidate events are observed with 2.4% background, representing a factor of 40 increase in statistics over the current world sample. We find that B(K(L)-->mu(+)mu(-)gamma) = (3.62 +/- 0.04(stat) +/- 0.08(syst)) x 10(-7). The form factor parameter alpha(K*) is measured to be alpha(K*) = -0.160(+0.026)(-0.028). In addition, we make the first measurement of the parameter alpha from the D'Ambrosio-Isidori-Portolés form factor, finding alpha = -1.54 +/- 0.10. In that model, this alpha measurement limits the Cabibbo-Kobayashi-Maskawa parameter rho>-0.2.
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