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Measurement of the branching ratio and form factor of K(L)-->mu(+)mu(-)gamma |
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| 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 |
| Institution: | 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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