Measurement of B(Ds -> munu)

Details Measurement of B(Ds -> munu) Measurement of B(Ds -> munu)

2007-09-10

arxiv.org/abs/0709.1340v2

Phys.Rev.Lett.100:241801,2008

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 2 figures, replaced by version subm. to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.100.241801

We present a measurement of the branching fraction $B(D_s^+\to\mu^+\nu_\mu)$ using a 548 fb$^{-1}$ data sample collected by the Belle experiment at the KEKB $e^+e^-$ collider. The $D_s$ momentum is determined by reconstruction of the system recoiling against $DK\gamma X$ in events of the type $e^+e^-\to D_s^\ast DKX, D_s^\ast \to D_s\gamma$, where $X$ represents additional pions or photons from fragmentation. The full reconstruction method provides high resolution in the neutrino momentum and thus good background separation, equivalent to that reached by experiments at the tau-charm factories. We obtain the branching fraction $B(D_s^+\to\mu^+\nu_\mu) = (6.44 \pm 0.76({\rm stat}) \pm 0.57({\rm syst})) \cdot 10^{-3}$, implying a $D_s$ decay constant of $f_{D_s} = (275 \pm 16({\rm stat}) \pm 12({\rm syst}))$ MeV.

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