Using data collected with the CLEO detector operating at the CESR e{sup +}e{sup -} collider at {radical}(s)=3.97-4.26 GeV, we investigate 15 charmonium decay modes of the {psi}(4040), {psi}(4160), ...and Y(4260) resonances. We confirm, at 11{sigma} significance, the BABAR Y(4260){yields}{pi}{sup +}{pi}{sup -}J/{psi} discovery, make the first observation of Y(4260){yields}{pi}{sup 0}{pi}{sup 0}J/{psi} (5.1{sigma}), and find the first evidence for Y(4260){yields}K{sup +}K{sup -}J/{psi} (3.7{sigma}). We measure e{sup +}e{sup -} cross sections at {radical}(s)=4.26 GeV as {sigma}({pi}{sup +}{pi}{sup -}J/{psi})=58{sub -10}{sup +12}{+-}4 pb, {sigma}({pi}{sup 0}{pi}{sup 0}J/{psi})=23{sub -8}{sup +12}{+-}1 pb, and {sigma}(K{sup +}K{sup -}J/{psi})=9{sub -5}{sup +9}{+-}1 pb, in which the uncertainties are statistical and systematic, respectively. Upper limits are placed on other decay rates from all three resonances.
We extract a relatively precise value for the decay constant of the D{sup +} meson by measuring B(D{sup +}{yields}{mu}{sup +}{nu})=(4.40{+-}0.66{sub -0.12}{sup +0.09})x10{sup -4} using 281 pb{sup -1} ...of data taken on the {psi}(3770) resonance with the CLEO-c detector. We find f{sub D{sup +}}=(222.6{+-}16.7{sub -3.4}{sup +2.8}) MeV, and compare with current theoretical calculations. We also set a 90% confidence upper limit on B(D{sup +}{yields}e{sup +}{nu})<2.4x10{sup -5} which constrains new physics models.
With the first data sample collected by the CLEO-c detector at the {psi}(3770) resonance we have studied four exclusive semileptonic decays of the D{sup 0} meson. Our results include the first ...observation and absolute branching fraction measurement for D{sup 0}{yields}{rho}{sup -}e{sup +}{nu}{sub e} and improved measurements of the absolute branching fractions for D{sup 0} decays to K{sup -}e{sup +}{nu}{sub e}, {pi}{sup -}e{sup +}{nu}{sub e}, and K*{sup -}e{sup +}{nu}{sub e}.
Using 55.8 pb{sup -1} of e{sup +}e{sup -} collisions recorded at the {psi}(3770) resonance with the CLEO-c detector at CESR, we determine absolute hadronic branching fractions of charged and neutral ...D mesons using a double tag technique. Among measurements for three D{sup 0} and six D{sup +} modes, we obtain reference branching fractions B(D{sup 0}{yields}K{sup -}{pi}{sup +})=(3.91{+-}0.08{+-}0.09)% and B(D{sup +}{yields}K{sup -}{pi}{sup +}{pi}{sup +})=(9.5{+-}0.2{+-}0.3)%, where the uncertainties are statistical and systematic, respectively. Final state radiation is included in these branching fractions by allowing for additional, unobserved, photons in the final state. Using a determination of the integrated luminosity, we also extract the cross sections {sigma}(e{sup +}e{sup -}{yields}D{sup 0}D{sup 0})=(3.60{+-}0.07{sub -0.05}{sup +0.07}) nb and {sigma}(e{sup +}e{sup -}{yields}D{sup +}D{sup -})=(2.79{+-}0.07{sub -0.04}{sup +0.10}) nb.
From e{sup +}e{sup -} collision data acquired with the CLEO detector at the Cornell Electron Storage Ring, we observe the non-DD decay {psi}(3770){yields}{gamma}{chi}{sub c1} with a statistical ...significance of 6.6 standard deviations, using the two-photon cascades to J/{psi} and J/{psi}{yields}l{sup +}l{sup -}. We determine {sigma}(e{sup +}e{sup -}{yields}{psi}(3770))xB({psi}(3770){yields}{gamma}{chi}{sub c1})=(18.0{+-}3.3= {+-}2.5) pb and branching fraction B({psi}(3770){yields}{gamma}{chi}{sub c1})=(2.8{+-}0.5{+-}0.4)x10{sup -3}. We set 90% C.L. upper limits for the transition to {chi}{sub c2} ({chi}{sub c0}): {sigma}xB<5.7 pb (<282 pb) and B<0.9x10{sup -3} (<44x10{sup -3}). We also determine {gamma}({psi}(3770){yields}{gamma}{chi}{sub c1})/{gamma}({psi}(3770){yields}{pi}{sup +}{pi}{sup -}J/= {psi})=1.5{+-}0.3{+-}0.3 (>1.0 at 90% C.L.), which bears upon the interpretation of X(3872)
We use data collected by the CLEO III detector at the Cornell Electron Storage Ring to measure the inclusive yields of D{sub s} mesons as B({upsilon}(5S){yields}D{sub s}X)=(44.7{+-}4.2{+-}9.9)% and ...B({upsilon}(4S){yields}D{sub s}X)=(18.1{+-}0.5{+-}2.8)%. From these measurements, we make a model dependent estimate of the ratio of B{sub s}{sup (*)}B{sub s}{sup (*)} to the total bb quark pair production of (16.0{+-}2.6{+-}5.8)% at the {upsilon}(5S) energy.
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