Observation of the decay K- --> pi(-)mu(+)mu(-) and measurements of the branching ratios for K+/- --> pi(+/-)mu(+)mu(-) |
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| Authors: | Park H K,Burnstein R A,Chakravorty A,Chan A,Chen Y C,Choong W S,Clark K,Dukes E C,Durandet C,Felix J,Gidal G,Gu P,Gustafson H R,Ho C,Holmstrom T,Huang M,James C,Jenkins C M,Kaplan D M,Lederman L M,Leros N,Longo M J,Lopez F,Lu L,Luebke W,Luk K B,Nelson K S,Perroud J P,Rajaram D,Rubin H A,Teng P K,Volk J,White C,White S,Zyla P HyperCP Collaboration |
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| Affiliation: | University of Michigan, Ann Arbor, Michigan 48109, USA. |
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| Abstract: | Using data collected with the HyperCP (E871) spectrometer during the 1997 fixed-target run at Fermilab, we report the first observation of the decay K--->pi(-)mu(+)mu(-) and new measurements of the branching ratios for K+/--->pi(+/-)mu(+)mu(-). By combining the branching ratios for the decays K+-->pi(+)mu(+)mu(-) and K--->pi(-)mu(+)mu(-), we measure Gamma(K+/--->pi(+/-)mu(+)mu(-))/Gamma(K+/--->all) = (9.8+/-1.0+/-0.5)x10(-8). The CP asymmetry between the rates of the two decay modes is [Gamma(K+-->pi(+)mu(+)mu(-))-Gamma(K--->pi(-)mu(+)mu(-))]/[Gamma(K+-->pi(+)mu(+)mu(-))+Gamma(K--->pi(-)mu(+)mu(-))] = -0.02+/-0.11+/-0.04. |
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