Measurement of B(D{sub s}{sup +}{yields}{mu}{sup +}{nu}{sub {mu}})

Le résumé fourni par la source

We present a measurement of the branching fraction B(D{sub s}{sup +}{yields}{mu}{sup +}{nu}{sub {mu}}) using a 548 fb{sup -1} data sample collected by the Belle experiment at the KEKB e{sup +}e{sup -} collider. The D{sub s} momentum is determined by reconstruction of the system recoiling against DK{gamma}X in events of the type e{sup +}e{sup -}{yields}D{sub s}*DKX, D{sub s}*{yields}D{sub s}{gamma}, where X represents additional pions or photons from fragmentation. This full-reconstruction method provides high resolution in the neutrino momentum and thus good background separation, equivalent to that achieved by experiments at the tau-charm factories. We obtain the branching fraction B(D{sub s}{sup +}{yields}{mu}{sup +}{nu}{sub {mu}})=[6.44{+-}0.76(stat){+-}0.57(syst)]x10{sup -3}, implying a D{sub s} decay constant of f{sub D{sub s}}=[275{+-}16(stat){+-}12(syst)] MeV.

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