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arxiv: hep-ex/9606017 · v1 · submitted 1996-06-28 · ✦ hep-ex

Measurement of B(D_s+ -> mu+ nu_mu)/B(D_s+ -> phi mu+ nu_mu) and Determination of the Decay Constant f_(D_s)

K.Kodama , S.Torikai , N.Ushida , A.Mokhtarani , V.S.Paolone , J.T.Volk , J.O.Wilcox , P.M.Yager
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R.M.Edelstein A.P.Freyberger D.B.Gibaut R.J.Lipton W.R.Nichols D.M.Potter J.S.Russ C.Zhang Y.Zhang H.I.Jang J.Y.Kim B.R.Baller R.J.Stefanski K.Nakazawa S.H.Chung M.S.Park I.G.Park J.S.Song C.S.Yoon M.Aryal N.W.Reay R.A.Sidwell N.R.Stanton S.Yoshida M.Chikawa T.Hara S.Aoki K.Hoshino M.Kobayashi M.Komatsu M.Miyanishi M.Nakamura S.Nakanishi K.Niwa M.Nomura K.Okada H.Tajima K.Teraoka J.M.Dunlea S.G.Frederiksen S.Kuramata B.G.Lundberg G.A.Oleynik K.Reibel G.R.Kalbfleisch P.Skubic J.M.Snow S.E.Willis K.Nakamura T.Okusawa T.Yoshida H.Okabe J.Yokota N.Ihara M.Kazuno T.Koya E.Niu S.Ogawa H.Shibuya S.Watanabe N.Yasuda K.Ehara K.Horie Y.Sato K.Suzuki I.Tezuka (Fermilab E653 Collaboration)
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keywords decayconstantexperimentadditiondecaysdetecteddeterminatione653
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We have observed $23.2 \pm 6.0_{-0.9}^{+1.0}$ purely-leptonic decays of $D_s^+ -> \mu^+ \nu_\mu$ from a sample of muonic one prong decay events detected in the emulsion target of Fermilab experiment E653. Using the $D_s^+ -> \phi \mu^+ \nu_\mu$ yield measured previously in this experiment, we obtain $B(D_s^+ --> \mu^+ \nu_\mu) / B(D_s^+ --> \phi \mu^+ \nu_\mu) =0.16 \pm 0.06 \pm 0.03$. In addition, we extract the decay constant $f_{D_s}=194 \pm 35 \pm 20 \pm 14 MeV$.

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