Publication Date:
2013-09-01
Description:
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 $ egin{array}{*{20}{c}} {mathcal{B}left( {D_s^{+} o {K^{-}}{K^{+}}{pi^{+}}}
ight) = left( {5.06pm 0.15pm 0.21}
ight)\%,} {mathcal{B}left( {D_s^{+} o {{overline{K}}^0}{K^{+}}}
ight) = left( {2.95pm 0.11pm 0.09}
ight)\%,} {mathcal{B}left( {D_s^{+} o eta {pi^{+}}}
ight) = left( {1.82pm 0.14pm 0.07}
ight)\%,} end{array} $ where the first and second uncertainties are statistical and systematic, respectively. The branching fractions of leptonic decays are measured to be $ egin{array}{*{20}{c}} {mathcal{B}left( {D_s^{+} o {mu^{+}}{
u_{mu }}}
ight)=left( {0.531pm 0.028pm 0.020}
ight)\%,} {mathcal{B}left( {D_s^{+}o {au^{+}}{
u_{au }}}
ight)=left( {5.70pm 0.21_{-0.30}^{-0.31 }}
ight)\%,} end{array} $ which are combined to determine the $ D_s^{+} $ meson decay constant $ {f_{{{D_s}}}}=left( {255.5pm 4.2pm 5.1}
ight) 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^{+} o {e^{+}}{
u_e}}
ight) $
Print ISSN:
1126-6708
Electronic ISSN:
1029-8479
Topics:
Physics
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