Author:
,Zupanc A.,Adachi I.,Aihara H.,Arinstein K.,Asner D. M.,Aushev T.,Bakich A. M.,Bala A.,Bhuyan B.,Bonvicini G.,Bozek A.,Bračko M.,Brodzicka J.,Browder T. E.,Chang M.-C.,Chang P.,Chekelian V.,Chen A.,Chen P.,Cheon B. G.,Chilikin K.,Chistov R.,Cho K.,Chobanova V.,Choi S.-K.,Choi Y.,Cinabro D.,Dalseno J.,Danilov M.,Doležal Z.,Drásal Z.,Dutta D.,Eidelman S.,Farhat H.,Fast J. E.,Ferber T.,Gaur V.,Gabyshev N.,Ganguly S.,Gillard R.,Goh Y. M.,Golob B.,Haba J.,Hara T.,Hayasaka K.,Hayashii H.,Horii Y.,Hoshi Y.,Hou W.-S.,Hsiung Y. B.,Hyun H. J.,Iijima T.,Inami K.,Ishikawa A.,Itoh R.,Iwasaki Y.,Iwashita T.,Jaegle I.,Julius T.,Kato E.,Kawai H.,Kawasaki T.,Kichimi H.,Kiesling C.,Kim D. Y.,Kim H. O.,Kim J. B.,Kim J. H.,Kim M. J.,Kim Y. J.,Kinoshita K.,Klucar J.,Ko B. R.,Kodyš P.,Korpar S.,Križan P.,Krokovny P.,Kronenbitter B.,Kuhr T.,Kumita T.,Kuzmin A.,Kwon Y.-J.,Lange J. S.,Lee S.-H.,Li J.,Libby J.,Liu Z. Q.,Liventsev D.,Lukin P.,Miyata H.,Mizuk R.,Mohanty G. B.,Moll A.,Mussa R.,Nakano E.,Nakao M.,Nedelkovska E.,Nisar N. K.,Nishida S.,Nitoh O.,Ogawa S.,Okuno S.,Pakhlova G.,Park C. W.,Park H.,Park H. K.,Pedlar T. K.,Pestotnik R.,Petrič M.,Piilonen L. E.,Prim M.,Ritter M.,Röhrken M.,Rostomyan A.,Ryu S.,Sahoo H.,Saito T.,Sakai Y.,Sandilya S.,Santelj L.,Sanuki T.,Sato Y.,Savinov V.,Schneider O.,Schnell G.,Schwanda C.,Schwartz A. J.,Semmler D.,Senyo K.,Sevior M. E.,Shapkin M.,Shen C. P.,Shibata T.-A.,Shiu J.-G.,Shwartz B.,Sibidanov A.,Simon F.,Sohn Y.-S.,Sokolov A.,Solovieva E.,Starič M.,Steder M.,Sumiyoshi T.,Tamponi U.,Tanida K.,Tatishvili G.,Teramoto Y.,Trabelsi K.,Tsuboyama T.,Uchida M.,Uglov T.,Uno S.,Usov Y.,Vahsen S. E.,Van Hulse C.,Vanhoefer P.,Varner G.,Vinokurova A.,Vorobyev V.,Wagner M. N.,Wang C. H.,Wang M.-Z.,Wang P.,Wang X. L.,Watanabe M.,Watanabe Y.,Won E.,Yamashita Y.,Yashchenko S.,Zhang Z. P.,Zhilich V.,Zhulanov V.
Abstract
Abstract
We present measurements of absolute branching fractions of hadronic and lep-tonic
$ D_s^{+} $
decays to K
−
K
+
π
+,
$ {{\overline{K}}^0} $
K
+, ηπ
+, μ
+
ν
μ
and τ
+
ν
τ
and report a search for the leptonic
$ D_s^{+} $
→ e
+
ν
e
decays. The results are obtained from a data sample of 913 fb−1 collected at or near the
$ \varUpsilon $
(4S) and
$ \varUpsilon $
(5S) resonances with the Belle detector at the KEKB asymmetric-energy e
+
e
− collider. The branching fractions of hadronic decays are measured to be
$ \begin{array}{*{20}{c}} {\mathcal{B}\left( {D_s^{+}\ \to\ {K^{-}}{K^{+}}{\pi^{+}}} \right) = \left( {5.06\pm 0.15\pm 0.21} \right)\%,} \\ {\mathcal{B}\left( {D_s^{+}\ \to\ {{\overline{K}}^0}{K^{+}}} \right) = \left( {2.95\pm 0.11\pm 0.09} \right)\%,} \\ {\mathcal{B}\left( {D_s^{+}\ \to\ \eta {\pi^{+}}} \right) = \left( {1.82\pm 0.14\pm 0.07} \right)\%,} \\ \end{array} $
where the first and second uncertainties are statistical and systematic, respectively. The branching fractions of leptonic decays are measured to be
$ \begin{array}{*{20}{c}} {\mathcal{B}\left( {D_s^{+}\ \to\ {\mu^{+}}{\nu_{\mu }}} \right)=\left( {0.531\pm 0.028\pm 0.020} \right)\%,} \\ {\mathcal{B}\left( {D_s^{+}\to {\tau^{+}}{\nu_{\tau }}} \right)=\left( {5.70\pm 0.21_{-0.30}^{-0.31 }} \right)\%,} \\ \end{array} $
which are combined to determine the
$ D_s^{+} $
meson decay constant
$ {f_{{{D_s}}}}=\left( {255.5\pm 4.2\pm 5.1} \right)\ \mathrm{MeV}. $
We find no significant signal for
$ D_s^{+} $
→ e
+
ν
e
decays and set an upper limit of
$ \mathcal{B}\left( {D_s^{+}\ \to\ {e^{+}}{\nu_e}} \right) $
< 1.0(0.83) × 10−4 at 95% (90%) confidence level.
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