E Dambasuren

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We report on a study of the invariant mass spectrum of the hadronic system in the decay ? ! ? 0. This study was performed with data obtained with the CLEO II detector operating at the CESR e + e ? collider. We present ts to phenomenological models in which resonance parameters associated with the (770) and (1450) mesons are determined. The ? 0 spectral(More)
We have measured the first and second moments of the hadronic mass-squared distribution in B-->X(c)l nu, for P(lepton)>1.5 GeV/c. We find <M(2)(X)-M macro(2)(D)> = 0.251+/-0.066 GeV(2), <(M(2)(X)-<M(2)(X)>)(2)> = 0.576+/-0.170 GeV(4), where M macro(D) is the spin-averaged D meson mass. From that first moment and the first moment of the photon energy(More)
We present the rst observation of the decay B ! J== K. Using 9:6 10 6 BB meson pairs collected with the CLEO detector, we have observed 10 fully reconstructed B ! J== K candidates, whereas the estimated background is 0:5 0:2 events. We obtain a branching fraction of B(B ! J== K) = (8:8 +3:5 ?3:0 stat] 1:33syst]) 10 ?5. This is the rst observed B meson decay(More)
We report the results of a search for the rare baryonic decay modes B 0 ! , B + ! p, B 0 ! pp ? , and B 0 ! pp (and their charge conjugate states) using 5:810 6 BB pairs collected with the CLEO detector. We see no statistically signiicant signals in any of these modes and set 90% conndence level upper limits on their branching fractions, 3 b t, c, u W g b u
We search for CP-violating charge asymmetries (alpha(CP)) in the B meson decays to K(+/-)pi(-/+), K(+/-)pi(0), K(0)(S)pi(+/-), K(+/-)eta('), and omega pi(+/-). Using 9.66 million upsilon(4S) decays collected with the CLEO detector, the statistical precision on alpha(CP) is in the range of +/-0.12 to +/-0.25 depending on decay mode. While CP-violating(More)
We describe the design, construction and performance of a Ring Imaging Cherenkov Detector (RICH) constructed to identify charged particles in the CLEO experiment. Cherenkov radiation occurs in LiF crystals, both planar and ones with a novel " sawtooth "-shaped exit surface. Photons in the wavelength interval 135–165 nm are detected using multi-wire chambers(More)
We present the first study of the vector (Wess-Zumino) current in tau(-)-->K-pi-K+nu(tau) decay using data collected with the CLEO III detector at the Cornell Electron Storage Ring. We determine the quantitative contributions to the decay width from the vector and axial vector currents. Within the framework of a model by Kühn and Mirkes, we identify the(More)
Using 13.53 fb(-1) of CLEO data, we have measured the ratios of the branching fractions R(+)(e),R(+)(mu) and the combined branching fraction ratio R(+)(l), defined by R(+)(l)=[B(D+-->K(*0)l(+)nu(l))]/[B(D+-->K-pi(+)pi(+))]. We find R(+)(e)=0.74+/-0.04+/-0.05, R(+)(mu)=0.72+/-0.10+/-0.05, and R(+)(l)=0.74+/-0.04+/-0.05, where the first and second errors are(More)