L. Gibbons

Improved measurement of absolute branching fraction of D{sub s}{sup +}{yields}{tau}{sup +}{nu}{sub {tau}}

We have studied the leptonic decay D{sub s}{sup +}{yields}{tau}{sup +}{nu}{sub {tau}}, via the decay channel {tau}{sup +}{yields}e{sup +}{nu}{sub e}{nu}{sub {tau}}, using a sample of tagged D{sub s}{sup +} decays collected near the D{sub s}*{sup {+-}}D{sub s}{sup {+-}} peak production energy in e{sup +}e{sup -} collisions with the CLEO-c detector. We obtain B(D{sub s}{sup +}{yields}{tau}{sup +}{nu}{sub {tau}})=(5.30{+-}0.47{+-}0.22)% and determine the decay constant f{sub D{sub s}}=(252.5{+-}11.1{+-}5.2) MeV, where the first uncertainties are statistical and the second are systematic.

First model-independent determination of the relative strong phase between D{sup 0} and D{sup 0}{yields}K{sub S}{sup 0}{pi}{sup +}{pi}{sup -} and its impact on the CKM angle {gamma}/{phi}{sub 3} measurement

We exploit the quantum coherence between pair-produced D 0 and D 0 in Ψ(3770) decays to make a first determination of the relative strong phase differences between D 0 → K 0 S π + π - and D 0 → K 0 S π + π - which are of great importance in determining the Cabibbo-Kobayashi-Maskawa angle γ/Φ 3 in B - → D 0 (D 0 )K - decays. Using 818 pb -1 of e + e - collision data collected with the CLEO-c detector at E cm = 3.77 GeV, we employ a binned Dalitz-plot analysis of K 0 S π + π - and K 0 L π + π - decays recoiling against flavor-tagged, CP-tagged, and K 0 S π + π - -tagged events to determine these strong phase differences.

Measurement of the pseudoscalar decay constant f{sub D{sub s}} using D{sub s}{sup +}{yields}{tau}{sup +}{nu}, {tau}{sup +}{yields}{rho}{sup +}{nu} decays

Analyzing 600 pb{sup -1} of e{sup +}e{sup -} collisions at 4170 MeV center-of-mass energy with the CLEO-c detector, we measure the branching fraction B(D{sub s}{sup +}{yields}{tau}{sup +}{nu})=(5.52{+-}0.57{+-}0.21)% using the {tau}{sup +}{yields}{rho}{sup +}{nu} decay mode. Combining with other CLEO measurements of B(D{sub s}{sup +}{yields}{tau}{sup +}{nu}) we determine the pseudoscalar decay constant f{sub D{sub s}}=(259.7{+-}7.8{+-}3.4) MeV consistent with the value obtained from our D{sub s}{sup +}{yields}{mu}{sup +}{nu} measurement of (257.6{+-}10.3{+-}4.3) MeV. Combining these measurements we find a value of f{sub D{sub s}}=(259.0{+-}6.2{+-}3.0) MeV, that differs from the most accurate prediction based on unquenched lattice gauge theory of (241{+-}3) MeV by 2.4 standard deviations. We also present the first measurements of B(D{sub s}{sup +}{yields}K{sup 0}{pi}{sup +}{pi}{sup 0})=(1.00{+-}0.18{+-}0.04)%, and B(D{sub s}{sup +}{yields}{pi}{sup +}{pi}{sup 0}{pi}{sup 0})=(0.65{+-}0.13{+-}0.03)%, and measure a new value for B(D{sub s}{sup +}{yields}{eta}{rho}{sup +})=(8.9{+-}0.6{+-}0.5)%.

Determination of the D{sup 0}{yields}K{sup +}{pi}{sup -} relative strong phase using quantum-correlated measurements in e{sup +}e{sup -}{yields}D{sup 0}D{sup 0} at CLEO

We exploit the quantum coherence between pair-produced D{sup 0} and D{sup 0} in {psi}(3770) decays to study charm mixing, which is characterized by the parameters x and y, and to make a first determination of the relative strong phase {delta} between doubly Cabibbo-suppressed D{sup 0}{yields}K{sup +}{pi}{sup -} and Cabibbo-favored D{sup 0}{yields}K{sup +}{pi}{sup -}. We analyze a sample of 1.0x10{sup 6} D{sup 0}D{sup 0} pairs from 281 pb{sup -1} of e{sup +}e{sup -} collision data collected with the CLEO-c detector at E{sub cm}=3.77 GeV. By combining CLEO-c measurements with branching fraction input and time-integrated measurements of R{sub M}{identical_to}(x{sup 2}+y{sup 2})/2 and R{sub WS}{identical_to}{gamma}(D{sup 0}{yields}K{sup +}{pi}{sup -})/{gamma}(D{sup 0}{yields}K{sup +}{pi}{sup -}) from other experiments, we find cos{delta}=1.03{sub -0.17}{sup +0.31}{+-}0.06, where the uncertainties are statistical and systematic, respectively. In addition, by further including external measurements of charm mixing parameters, we obtain an alternate measurement of cos{delta}=1.10{+-}0.35{+-}0.07, as well as xsin{delta}=(4.4{sub -1.8}{sup +2.7}{+-}2.9)x10{sup -3} and {delta}=(22{sub -12-11}{sup +11+9}) deg.

Measurement of upper limits for {upsilon}{yields}{gamma}+R decays

We report on a study of exclusive radiative decays {upsilon}(nS){yields}{gamma}+R (n=1, 2, 3), with R a narrow resonant hadronic state decaying into four or more charged particles (plus possible neutrals). Using data collected from the CLEO III detector at the Cornell Electron Storage Ring, we present upper limits of order 10{sup -4} for such bottomonium two-body decays as a function of the mass M{sub R} recoiling opposite the photon.