J. Hietala

Observation of D{sup +}{yields}{eta}e{sup +}{nu}{sub e}

Using a 281 pb{sup -1} data sample collected at the {psi}(3770) resonance with the CLEO-c detector at the Cornell Electron Storage Ring, we report the first observation of D{sup +}{yields}{eta}e{sup +}{nu}{sub e}. We also set upper limits for D{sup +}{yields}{eta}{sup }e{sup +}{nu}{sub e} and D{sup +}{yields}{phi}e{sup +}{nu}{sub e} that are about 2 orders of magnitude more restrictive than those obtained by previous experiments.

First Observation of the Decay D{sub s}{sup +}{yields}pn

Using e{sup +}e{sup -}{yields}D{sub s}*{sup -}D{sub s}{sup +} data collected near the peak D{sub s} production energy, E{sub cm}=4170 MeV, with the CLEO-c detector, we present the first observation of the decay D{sub s}{sup +}{yields}pn. We measure a branching fraction B(D{sub s}{sup +}{yields}pn)=(1.30{+-}0.36{sub -0.16}{sup +0.12})x10{sup -3}. This is the first observation of a charmed meson decaying into a baryon-antibaryon final state.Using e+e--->Ds*-Ds+ data collected near the peak Ds production energy, Ecm=4170 MeV, with the CLEO-c detector, we present the first observation of the decay Ds+-->pn. We measure a branching fraction B(Ds+-->pn)=(1.30+/-0.36(-0.16)+0.12)x10(-3). This is the first observation of a charmed meson decaying into a baryon-antibaryon final state.

Study of the Decays D{sup 0}{yields}{pi}{sup -}e{sup +}{nu}{sub e}, D{sup 0}{yields}K{sup -}e{sup +}{nu}{sub e}, D{sup +}{yields}{pi}{sup 0}e{sup +}{nu}{sub e}, and D{sup +}{yields}K{sup 0}e{sup +}{nu}{sub e}

By using 1.8x10{sup 6} DD pairs, we have measured B(D{sup 0}{yields}{pi}{sup -}e{sup +}{nu}{sub e})=0.299(11)(9)%, B(D{sup +}{yields}{pi}{sup 0}e{sup +}{nu}{sub e})=0.373(22)(13)%, B(D{sup 0}{yields}K{sup -}e{sup +}{nu}{sub e})=3.56(3)(9)%, and B(D{sup +}{yields}K{sup 0}e{sup +}{nu}{sub e})=8.53(13)(23)% and have studied the q{sup 2} dependence of the form factors. By combining our results with recent lattice calculations, we obtain |V{sub cd}|=0.217(9)(4)(23) and |V{sub cs}|=1.015(10)(11)(106)

Radiative decays of the {upsilon}(1S) to {gamma}{pi}{sup 0}{pi}{sup 0}, {gamma}{eta}{eta} and {gamma}{pi}{sup 0}{eta}

We report on a study of exclusive radiative decays of the Υ(1S) resonance into the final states γπ0π0, γηη and γπ0η, using 1.13 fb−1 of e+e− annihilation data collected at √ s = 9.46GeV with the CLEO III detector operating at the Cornell Electron Storage Ring. In the channel γπ0π0, we measure the branching ratio for the decay mode Υ(1S) → γf2(1270) to be (10.5 ± 1.6 (stat) +1.9 −1.8 (syst)) × 10−5. We place upper limits on the product branching ratios for the isoscalar resonances f0(1500) and f0(1710) for the π 0π0 and ηη decay channels. We also set an upper limit on the Υ(1S) radiative decay into π0η. PACS numbers: 13.20.Gd, 12.39.Mk

Measurement of B(D{sub s}{sup +}{yields}l{sup +}{nu}) and the decay constant f{sub D{sub S}{sup +}}

We examine e{sup +}e{sup -}{yields}D{sub s}{sup -}D{sub s}*{sup +} and D{sub s}*{sup -}D{sub s}{sup +} interactions at 4170 MeV using the CLEO-c detector in order to measure the decay constant f{sub D{sub s}{sup +}}. We use the D{sub s}{sup +}{yields}l{sup +}{nu} channel, where the l{sup +} designates either a {mu}{sup +} or a {tau}{sup +}, when the {tau}{sup +}{yields}{pi}{sup +}{nu}. Analyzing both modes independently, we determine B(D{sub s}{sup +}{yields}{mu}{sup +}{nu})=(0.594{+-}0.066{+-}0.031)%, and B(D{sub s}{sup +}{yields}{tau}{sup +}{nu})=(8.0{+-}1.3{+-}0.4)%. We also analyze them simultaneously to find an effective value of B{sup eff}(D{sub s}{sup +}{yields}{mu}{sup +}{nu})=(0.638{+-}0.059{+-}0.033)% and extract f{sub D{sub s}{sup +}}=274{+-}13{+-}7 MeV. Combining with our previous determination of B(D{sup +}{yields}{mu}{sup +}{nu}), we also find the ratio f{sub D{sub s}{sup +}}/f{sub D{sup +}}=1.23{+-}0.11{+-}0.04. We compare to current theoretical estimates. Finally, we find B(D{sub s}{sup +}{yields}e{sup +}{nu})<1.3x10{sup -4} at 90% confidence level.

Search for {psi}(2S){yields}{eta}{sub c}{pi}{sup +}{pi}{sup -}{pi}{sup 0}

Using 5.63 pb{sup -1} of data accumulated at the {psi}(2S) resonance with the CLEO III and CLEO-c detectors corresponding to 3.08x10{sup 6} {psi}(2S) decays, a search is performed for the decay {psi}(2S){yields}{eta}{sub c}{pi}{sup +}{pi}{sup -}{pi}{sup 0} to test a theoretical prediction based upon the assumption that the cc pair in the {psi}(2S) does not annihilate directly into three gluons but rather survives before annihilating. No signal is observed, and a combined upper limit from six {eta}{sub c} decay modes is determined to be B({psi}(2S){yields}{eta}{sub c}{pi}{sup +}{pi}{sup -}{pi}{sup 0}){<=}1.0x10{sup -3} at 90% C.L. This upper limit is about an order of magnitude below the theoretical expectation.Using

Measurement of {sigma}(e{sup +}e{sup -}{yields}{psi}(3770){yields}hadrons) at E{sub c.m.}=3773 MeV

5.63text{ }text{ }{mathrm{pb}}^{ensuremath{-}1}

Model independent measurement of form factors in the decay D{sup +}{yields}K{sup -}{pi}{sup +}e{sup +}{nu}{sub e}

of data accumulated at the

Erratum: J/{psi} and {psi}(2S) Radiative Transitions to {eta}{sub c}[Phys. Rev. Lett. 102, 011801 (2009)]

ensuremath{psi}(2S)

Erratum: J/ and (2S) Radiative Transitions to η{sub c}[Phys. Rev. Lett. 102, 011801 (2009)]

resonance with the CLEO III and CLEO-c detectors corresponding to