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

Now showing items 421-440 of 546

    • 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(-) ...

    • A search for nonresonant B+->h(+)h(-)h(+) decays 

      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, 1996-11)
      We use data collected by the CLEO II detector at the Cornell Electron Storage Ring (CESR) to search for B+ --> h(+)h(-)h(+) (nonresonant) decays, where h(+/-) can be either pi(+/-), K-+/-, or p((p) over bar). We see no ...

    • Observation of two excited charmed baryons decaying into Lambda(+)(c)pi(+/-) 

      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, 1997-03)
      Using data recorded by the CLEO-II detector at CESR, we report evidence of a pair of excited charmed baryons, one decaying into Lambda(c)(+)pi(+)2 and the other into Lambda(c)(+)pi(-). The doubly charged state has a measured ...

    • Observation of two narrow states decaying into Xi(+)(c)gamma and Xi(0)(c)gamma 

      Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Davis, Robin E. P.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan; Zhou, L. (AMERICAN PHYSICAL SOC, 1999-01)
      We report the first observation of two narrow charmed strange baryons decaying to Xi(c)(+) gamma and Xi(c)(0)gamma, respectively, using data from the CLEO II detector at the Cornell Electron Storage Ring. We interpret the ...

    • New measurement of B -> D*pi branching fractions 

      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, 1998-03)
      The decays Y(4S) --> <B(B)over bar>, followed by B --> D*pi and D* --> D pi, permit reconstruction of all kinematic quantities that describe the sequence without reconstruction of the D, with reasonably low backgrounds. ...

    • Search for the decays B-0->D(*)D+(*)(-) 

      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)
      Using the CLEO-II data set we have searched for the decays B-0 --> D-(*+)D-(*-) We observe one candidate signal event for the decay B-0 --> D*+D*- with an expected background of 0.022 +/- 0.011 events. This yield corresponds ...

    • Observation of exclusive B decays to final states containing a charmed baryon 

      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, 1997-10)
      Using data collected in the region of the Upsilon(4S) resonance with the CLEO-II detector, we report on the first observation of exclusive decays of the B meson to final states with a charmed baryon. We have measured the ...

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

      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, 1999-01)
      The decay tau(-) --> K*(-) eta nu(tau) has been observed with the CLEO II detector. The K*(-) is reconstructed in two decay channels, K*(-) -->, KSpi- --> pi(-)pi(+)pi(-) and K*(-) --> K- pi(0). The eta is reconstructed ...

    • First observations of Y(1S)->gamma pi(+)pi(-) and Y(1S)->gamma pi(0)pi(0) 

      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, 1999-01)
      We report on a study of exclusive radiative decays of the Y(1S) resonance collected with the CLEO II detector operating at the Cornell Electron Storage Ring. We present the first observation of the radiative decays Y(1S) ...