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

Now showing items 481-500 of 554

    • Two-body B meson decays to eta and eta ': Observation of B ->eta ' K 

      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, 1998-04)
      In a sample of 6.6 x 10(6) produced B mesons we have observed decays B --> eta'K, with branching fractions B(B+ --> eta'K+)= (6.5(-1.4)(+1.5) +/- 0.9) X 10(-5) and B(B-0 --> eta'K-0) = (4.7(-2.0)(+2.7) +/- 0.9) X 10(-5). ...

    • Observation of exclusive two-body B decays to kaons and pions 

      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, 1998-04)
      We have studied two-body charmless hadronic decays of B mesons into the final states pi pi, K pi and KK. Using 3.3 x 10(6) B (B) over bar pairs collected with the CLEO-II detector, we have made the first observation of the ...

    • Observation of high momentum eta(l) production in B decays 

      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, 1998-08)
      We report the first observation of B --> eta'X transitions with high momentum eta' mesons. We observe 39.0 +/- 11.6 B decay events with 2.0 < p(eta') < 2.7 GeV/c, the high momentum region where background from b --> c ...

    • Dalitz analysis of D-0 -> K-S(0)pi(+)pi(-) 

      Ammar, Raymond G.; Besson, David Zeke; Zhao, X. (AMERICAN PHYSICAL SOC, 2002-12)
      In e(+)e(-) collisions using the CLEO detector, we have studied the decay of the D-0 to the final state K(S)(0)pi(+)pi(-) with the initial flavor of the D-0 tagged by the decay D*+-->D(0)pi(+). We use the Dalitz technique ...

    • Constraints on cosmic neutrino fluxes from the Antarctic Impulsive Transient Antenna experiment 

      Besson, David Zeke (AMERICAN PHYSICAL SOC, 2006-05)
      We report new limits on cosmic neutrino fluxes from the test flight of the Antarctic Impulsive Transient Antenna (ANITA) experiment, which completed an 18.4 day flight of a prototype long-duration balloon payload, called ...

    • First search for the flavor changing neutral current decay D-0 -> gamma gamma 

      Ammar, Raymond G.; Besson, David Zeke (AMERICAN PHYSICAL SOC, 2003-03)
      Using 13.8 fb(-1) of data collected at or just below the Y(4S) with the CLEO detector, we report the result of a search for the flavor changing neutral current process D-0 --> gammagamma. We observe no significant signal ...

    • Measurement of B(D-0 -> K-pi(+)) using partial reconstruction of (B)over-bar -> D(*+)Xl(-)(nu)over-bar 

      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, 1998-04)
      We present a measurement of the absolute branching fraction for D-0 --> K- pi(+) using the reconstruction of the decay chain (B)over-bar --> D(*+)Xl(-)(v)over-bar, D*+ --> D-0 pi(+) when only the lepton and the low-momentum ...

    • Measurement of B(D+->(K)over-bar(*0)l(+)nu(l)) 

      Ammar, Raymond G.; Besson, David Zeke; Zhao, X. (AMERICAN PHYSICAL SOC, 2002-11)
      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) over bar (*0)l(+)nu(l))]/[B(D+-->K(-) ...

    • Two-body B meson decays to eta and eta ': Observation of B ->eta K 

      Ammar, Raymond G.; Bean, Alice; Besson, David Zeke; Davis, Robin E. P.; Kravchenko, I.; Kwak, Nowhan; Zhao, X. (AMERICAN PHYSICAL SOC, 2000-07)
      In a sample of 19 x 10(6) produced B mesons, we have observed the decays B --> eta K* and improved our previous measurements of B --> eta'K. The branching fractions we measure for these decay modes are B(B+ --> eta K*(+)) ...

    • Observation of the decay Omega(0)(c)->Omega(-)e(+)nu(e) 

      Ammar, Raymond G.; Besson, David Zeke; Zhao, X. (AMERICAN PHYSICAL SOC, 2002-10)
      Using the CLEO detector at the Cornell Electron Storage Ring we have observed the Omega(c)(0) (css ground state) in the decay Omega(c)(0) --> Omega(-)e(+)nu(e). We find a signal of 11.4 +/- 3.8(stat) events. The probability ...

    • Measurement of charge asymmetries in charmless hadronic B meson decays 

      Ammar, Raymond G.; Bean, Alice; Besson, David Zeke; Davis, Robin E. P.; Kravchenko, I.; Kwak, Nowhan; Zhao, X. (AMERICAN PHYSICAL SOC, 2000-07)
      We search for CP-violating charge asymmetries (A(CP)) in the B meson decays to K+/- pi(+/-), K+/- pi(0), K(S)(0)pi(+/-), K+/- eta', and omega pi(+/-). Using 9.66 million Y(4S) decays collected with the CLEO detector, the ...

    • Search for CP violation in B-+/--> J/psi K-+/- and B-+/-->psi(2S)K-+/- decays 

      Ammar, Raymond G.; Bean, Alice; Besson, David Zeke; Davis, Robin E. P.; Kwak, Nowhan; Zhao, X. (AMERICAN PHYSICAL SOC, 2000-06)
      We present a search for direct CP violation in B+/- --> J/psi K+/- and B+/- --> psi(2S)K+/- decays. In a sample of 9.7 X 10(6) B (B) over bar meson pairs collected with the CLEO detector, we have fully reconstructed 534 ...

    • Search for D-0-(0) mixing 

      Ammar, Raymond G.; Bean, Alice; Besson, David Zeke; Davis, Robin E. P.; Kravchenko, I.; Kwak, Nowhan; Zhao, X. (AMERICAN PHYSICAL SOC, 2000-05)
      We have studied the "wrong-sign" process D-0 --> K+ pi(-) to search for D-0-(D) over bar(0) mixing. The data come from 9.0 fb(-1) of e(+) e(-) collisions at root s approximate to 10 GeV recorded with the CLEO II.V detector. ...

    • Observation of radiative leptonic decay of the tau lepton 

      Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Davis, Robin E. P.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan; Zhao, X. (AMERICAN PHYSICAL SOC, 2000-01)
      Using 4.68 fb(-1) of e(+) e(-) annihilation data collected with the CLEO II detector at the Cornell Electron Storage Ring, we have studied tau radiative decays tau(-) --> nu(tau)mu(-)<<(nu)over bar>(mu)gamma and tau- --> ...

    • Study of exclusive radiative B meson decays 

      Ammar, Raymond G.; Bean, Alice; Besson, David Zeke; Davis, Robin E. P.; Kwak, Nowhan; Zhao, X. (AMERICAN PHYSICAL SOC, 2000-06)
      We have studied exclusive, radiative B meson decays to charmless mesons in 9.7 X 10(6) B (B) over bar decays accumulated with the CLEO detector. We measure B(B-0 --> K*(0)(892)gamma) = (4.55(-0.68)(+0.72) +/- 0.34) X 10(-5) ...

    • Search for inclusive b -> sl(+)l(-) 

      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)
      We have searched for the effective flavor changing neutral-current decays b --> sl+l(-) using an inclusive method. We set upper limits on the branching ratios B(b --> se(+)e(-)) < 5.7 x 10(-5), B(b --> s mu(+)mu(-)) < 5.8 ...

    • Study of charmless hadronic B meson decays to pseudoscalar-vector final states 

      Ammar, Raymond G.; Bean, Alice; Besson, David Zeke; Davis, Robin E. P.; Kwak, Nowhan; Zhao, X. (AMERICAN PHYSICAL SOC, 2000-10)
      We report results of searches for charmless hadronic B meson decays to pseudoscalar (pi*(-), K*(-), pi(0), or K-S(0))-vector(rho, K*, or omega) final states. By using 9.7 X 10(6) B (B) over bar pairs collected with the ...

    • Evidence of new states decaying into Xi(*)(c)pi 

      Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Davis, Robin E. P.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan; Zhou, X. (AMERICAN PHYSICAL SOC, 1999-10)
      Using data recorded by the CLEO II detector at the Cornell Electron Storage Ring, we report evidence for two new charmed baryons, one decaying into Xi(c)(+) pi(+) pi(-) via an a intermediate Xi(c)(*o) and its isospin partner ...

    • Improved measurement of vertical bar V-ub vertical bar with inclusive semileptonic B decays 

      Ammar, Raymond G.; Besson, David Zeke; Zhao, X. (AMERICAN PHYSICAL SOC, 2002-06)
      We report a new measurement of the Cabibbo-Kobayashi-Maskawa parameter parallel toV(ub)parallel to made with a sample of 9.7x10(6) B (B) over bar events collected with the CLEO II detector. Using heavy quark theory, we ...

    • Measurements of the mass, total width, and two-photon partial width of the eta(c) meson 

      Ammar, Raymond G.; Bean, Alice; Besson, David Zeke; Davis, Robin E. P.; Kwak, Nowhan; Zhao, X. (AMERICAN PHYSICAL SOC, 2000-10)
      Using 13.4 fb(-1) of data collected with the CLEO detector at the Cornell Electron Storage Ring, we have observed 300 events for the two-photon production of ground-state pseudoscalar charmonium in the decay eta(c) --> ...