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Center for Russian, East European and Eurasian Studies: Recent submissions

Now showing items 421-440 of 554

    • Observation of psi(3770)->pi pi J/psi and measurement of Gamma(ee)[psi(2S)] 

      Besson, David Zeke (AMERICAN PHYSICAL SOC, 2006-03)
      We observe signals for the decays psi(3770)-> XJ/psi from data acquired with the CLEO detector operating at the CESR e(+)e(-) collider with root s=3773 MeV. We measure the following branching fractions B(psi(3770)-> XJ/psi) ...

    • Measurement of cabibbo-suppressed decays of the tau lepton 

      Ammar, Raymond G.; Ball, S.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kelly, M.; Kwak, Nowhan; Lam, H. (AMERICAN PHYSICAL SOC, 1994-08)
      Branching ratios for the dominant Cabibbo-suppressed decays of the tau lepton have been measured by CLEO II in e+e- annihilation at the Cornell Electron Storage Ring (square-root s approximately 10.6 GeV) using kaons with ...

    • Observation of inclusive B decays to the charmed baryons sigma(c)++ and delta(c)0 

      Ammar, Raymond G.; Ball, S.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kelly, M.; Kwak, Nowhan; Lam, H. (AMERICAN PHYSICAL SOC, 1994-09)
      Using data collected in the region of the UPSILON(4S) resonance with the CLEO II detector operating at the Cornell Electron Storage Ring, we report on evidence for the production of SIGMA(c)++ and SIGMA(c)0 baryons in B ...

    • Measurement of the branching fraction beta(tau(-) -> pi(0) nu(tau)) 

      Ammar, Raymond G.; Ball, S.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kelly, M.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan; Lam, H. (AMERICAN PHYSICAL SOC, 1994-06)
      Using data from the CLEO II detector at the Cornell Electron Storage Ring, we measure B(tau- --> h-pi0nu(tau)) where h- refers to either pi- or K-. We use three different methods to measure this branching fraction. The ...

    • Experimental limits on weak annihilation contributions to b -> ul nu decays 

      Besson, David Zeke (AMERICAN PHYSICAL SOC, 2006-03)
      We present the first experimental limits on high-q(2) contributions to charmless semileptonic B decays of the form expected from the weak annihilation (WA) decay mechanism. Such contributions could bias determinations of ...

    • Search for neutrinoless tau decays involving pi(0) or eta mesons 

      Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Darling, C.; Davis, Robin E. P.; Hancock, N.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan (AMERICAN PHYSICAL SOC, 1997-08)
      We have searched for lepton flavor violating decays of the tau lepton using final states with an electron Or a muon and one or two pi(0) or eta mesons but no neutrinos. The data used in the search were collected with the ...

    • Further search for the two-photon production of the glueball candidate f(J)(2220) 

      Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Darling, C.; Davis, Robin E. P.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan; Zhou, L. (AMERICAN PHYSICAL SOC, 1998-10)
      The CLEO II detector at the e(+)e(-) storage ring CESR has been used to search for two-photon production of the f(J)(2220) decaying into pi(+)pi(-). No evidence fora signal is found in 4.77 fb(-1) of data and a 95% C.L. ...

    • First measurement of the B->pi l nu and B->rho(omega)l nu branching fractions 

      Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan (AMERICAN PHYSICAL SOC, 1996-12)
      CLEO has studied B decays to pi l nu, rho l nu, and omega l nu, where l = e or mu, by incorporating the missing momentum into full B reconstruction. With the B-0 and B+ modes combined according to isospin predictions for ...

    • A measurement of the Michel parameters in leptonic decays of the tau 

      Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Darling, C.; Davis, Robin E. P.; Hancock, N.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan (AMERICAN PHYSICAL SOC, 1997-06)
      We have measured the spectral shape Michel parameters rho and eta using leptonic decays of the tau, recorded by the CLEO II detector. Assuming e-mu universality in the vectorlike couplings, we find rho(e mu) = 0.735 +/- ...

    • Measurements of the decays tau(-) -> h(-)h(+)h(-)nu(tau) and tau(-) -> h(-)h(+)h(-)pi(0)nu(tau) 

      Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan (AMERICAN PHYSICAL SOC, 1995-11)
      We use a data sample of 2.8 X 10(6) produced tau-pair events, obtained with the CLEO II detector, to measure B(tau(-) --> h(-)h(+)h(-)(pi(0))nu(tau)), where h refers to either a charged pi or K. These branching fractious ...

    • Observation of the isospin-violating decay Ds(*+) -> Ds(+) pi(0) 

      Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan (AMERICAN PHYSICAL SOC, 1995-10)
      Using data collected with the CLEO II detector, we have observed the isospin-violating decay D-s(*+) --> D-s(+) pi(0). The decay rate for this mode, relative to the dominant radiative decay, is found to be Gamma(D-s(*+) ...

    • Improved measurement of the form factors in the decay Lambda(+)(c) -> Lambda e(+)nu(e) 

      Besson, David Zeke (AMERICAN PHYSICAL SOC, 2005-05)
      Using the CLEO detector at the Cornell Electron Storage Ring, we have studied the distribution of kinematic variables in the decay Lambda(c)(+)->Lambda e(+)nu(e). By performing a four-dimensional maximum likelihood fit, ...

    • Observation of thirteen new exclusive multibody hadronic decays of the psi(2S) 

      Besson, David Zeke (AMERICAN PHYSICAL SOC, 2005-08)
      Using data accumulated with the CLEO detector corresponding to an integrated luminosity of L = 5.63 pb(-1) on the peak of the psi(2S) [3.08x10(6) psi(2S) decays] and 20.70 pb(-1) at root s = 3.67 GeV, we report first ...

    • Tau decays into three charged leptons and two neutrinos 

      Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan (AMERICAN PHYSICAL SOC, 1996-04)
      We search for the radiative leptonic tau decays tau --> ee(+) e(-)nu(tau)nu(e) and tau --> mu e(+)e(-)nu(tau)nu(mu) using 3.60 fb(-1) of data collected by the CLEO-II experiment at the Cornell Electron Storage Ring. We ...

    • Charmonium decays of Y(4260), psi(4160), and psi(4040) 

      Besson, David Zeke (AMERICAN PHYSICAL SOC, 2006-04)
      Using data collected with the CLEO detector operating at the CESR e(+)e(-) collider at root 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 ...

    • Measurements of the exclusive decays of the Upsilon(5S) to B meson final states and improved B-s(*) mass measurement 

      Besson, David Zeke (AMERICAN PHYSICAL SOC, 2006-04)
      Using 420 pb(-1) of data collected on the Upsilon(5S) resonance with the CLEO III detector, we reconstruct B mesons in 25 exclusive decay channels to measure or set upper limits on the decay rate of Upsilon(5S) into B meson ...

    • Measurement of the B semileptonic branching fraction with lepton tags 

      Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan (AMERICAN PHYSICAL SOC, 1996-03)
      We have used the CLEO II detector and 2.06 fb(-1) of Y(4S) data to measure the B-meson semileptonic branching fraction. The B --> Xe nu momentum spectrum was obtained over nearly the full momentum range by using charge and ...

    • Limits on flavor changing neutral currents in D-0 meson Decays 

      Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan (AMERICAN PHYSICAL SOC, 1996-04)
      Using the CLEO II detector at the Cornell Electron Storage Ring, we have searched for flavor changing neutral currents and lepton family number violations in D-0 meson decays. The upper limits on the branching fractions ...

    • Study of the semileptonic charm decays D-0 ->pi(-)l(+)nu and D-0 -> K(-)l(+)nu 

      Besson, David Zeke (AMERICAN PHYSICAL SOC, 2005-01)
      We investigate the decays D-0-->pi(-)l(+)nu and D-0-->K(-)l(+)nu, where l is e or mu, using approximately 7 fb(-1) of data collected with the CLEO III detector. We find R-0=B(D-0-->pi(-)e(+)nu)/B(D-0-->K(-)e(+)nu)=0.082+ ...

    • First observation of the decay tau(-)->K-eta nu(tau) 

      Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan (AMERICAN PHYSICAL SOC, 1996-05)
      The decay tau(-) --> K- eta nu(tau), has been observed with the CLEO II detector. The eta meson is reconstructed using two decay channels, eta --> gamma gamma and pi(+)pi(-)pi(0). The measured branching fraction is B(tau(-) ...