Measurements of branching fractions of leptonic and hadronic Ds+ meson decays and extraction of the Ds+ meson decay constant

A. Zupanc , I. Adachi , H. Aihara , K. Arinstein , D. M. Asner , T. Aushev , A. M. Bakich , A. Bala

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B. Bhuyan G. Bonvicini A. Bozek M. Bra\v{c}ko J. Brodzicka T. E. Browder M.-C. Chang P. Chang V. Chekelian A. Chen P. Chen B. G. Cheon K. Chilikin R. Chistov K. Cho V. Chobanova S.-K. Choi Y. Choi D. Cinabro J. Dalseno M. Danilov Z. Dole\v{z}al Z. Dr\'asal D. Dutta S. Eidelman H. Farhat J. E. Fast T. Ferber V. Gaur N. Gabyshev S. Ganguly R. Gillard Y. M. Goh B. Golob J. Haba T. Hara K. Hayasaka H. Hayashii Y. Horii Y. Hoshi W.-S. Hou Y. B. Hsiung H. J. Hyun T. Iijima K. Inami A. Ishikawa R. Itoh Y. Iwasaki T. Iwashita I. Jaegle T. Julius E. Kato H. Kawai T. Kawasaki H. Kichimi C. Kiesling D. Y. Kim H. O. Kim J. B. Kim J. H. Kim M. J. Kim Y. J. Kim K. Kinoshita J. Klucar B. R. Ko P. Kody\v{s} S. Korpar P. Kri\v{z}an P. Krokovny B. Kronenbitter T. Kuhr T. Kumita A. Kuzmin Y.-J. Kwon J. S. Lange S.-H. Lee J. Li J. Libby Z. Q. Liu D. Liventsev P. Lukin H. Miyata R. Mizuk G. B. Mohanty A. Moll R. Mussa E. Nakano M. Nakao E. Nedelkovska N. K. Nisar S. Nishida O. Nitoh S. Ogawa S. Okuno G. Pakhlova C. W. Park H. Park H. K. Park T. K. Pedlar R. Pestotnik M. Petri\v{c} L. E. Piilonen M. Prim M. Ritter M. R\"ohrken A. Rostomyan S. Ryu H. Sahoo T. Saito Y. Sakai S. Sandilya L. Santelj T. Sanuki Y. Sato V. Savinov O. Schneider G. Schnell C. Schwanda A. J. Schwartz D. Semmler K. Senyo M. E. Sevior M. Shapkin C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz A. Sibidanov F. Simon Y.-S. Sohn A. Sokolov E. Solovieva M. Stari\v{c} M. Steder T. Sumiyoshi U. Tamponi K. Tanida G. Tatishvili Y. Teramoto K. Trabelsi T. Tsuboyama M. Uchida T. Uglov S. Uno Y. Usov S. E. Vahsen C. Van Hulse P. Vanhoefer G. Varner A. Vinokurova V. Vorobyev M. N. Wagner C. H. Wang M.-Z. Wang P. Wang X. L. Wang M. Watanabe Y. Watanabe E. Won Y. Yamashita S. Yashchenko Z. P. Zhang V. Zhilich V. Zhulanov

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keywords decaysbranchingfractionsleptonichadronicmesonanti-k0constant

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We present measurements of absolute branching fractions of hadronic and leptonic Ds+ decays to K- K+ pi+, anti-K0 K+, eta pi+, mu+ nu_mu and tau+ nu_tau and report a search for the leptonic Ds+ to e+ nu_e decays. The results are obtained from a data sample of 913 fb^-1 collected at or near the Y(4S) and Y(5S) resonances with the Belle detector at the KEKB asymmetric-energy e+e- collider. The branching fractions of hadronic decays are measured to be Br(Ds+ -> K- K+ pi+) = (5.06 +- 0.15 +- 0.21)%, Br(Ds+ -> anti-K0 K+) = (2.95 +- 0.11 +- 0.09)%, and Br(Ds+ -> eta pi+) = (1.82 +- 0.14 +- 0.07)%, where the first and second uncertainties are statistical and systematic, respectively. The branching fractions of leptonic decays are measured to be Br(Ds+ -> mu+ nu_mu) = (0.531 +- 0.028 +- 0.020)%, and Br(Ds+ -> tau+ nu_tau) = (5.70 +- 0.21 +0.31-0.30)%, which are combined to determine the Ds+ meson decay constant f_Ds = (255.5 +- 4.2 +- 5.1) MeV. We find no significant signal for Ds+ -> e+ nu_e decays and set an upper limit of Br(Ds+ -> e+ nu_e) < 1.0 (0.83) x 10^-4 at 95% (90%) confidence level.

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