J. Libby

Model-independent determination of the strong-phase difference between D0 and D⊃̄0→KS,L0h+h- (h=π, K) and its impact on the measurement of the CKM angle γ/Φ3

We report the first determination of the relative strong-phase difference between D0→KS,L0K+K- and D 0→KS,L0K+K-. In addition, we present updated measurements of the relative strong-phase difference between D0→KS,L0π+π- and D 0→KS,L0π+π-. Both measurements exploit the quantum coherence between a pair of D0 and D 0 mesons produced from ψ(3770) decays. The strong-phase differences measured are important for determining the Cabibbo-Kobayashi-Maskawa angle γ/ϕ3 in B-→K-D˜0 decays, where D˜0 is a D0 or D 0 meson decaying to KS0h+h- (h=π, K), in a manner independent of the model assumed to describe the D0→KS0h+h- decay. Using our results, the uncertainty in γ/ϕ3 due to the error on the strong-phase difference is expected to be between 1.7° and 3.9° for an analysis using B-→K-D˜0, D˜0→KS0π+π- decays, and between 3.2° and 3.9° for an analysis based on B-→K-D˜0, D˜0→KS0K+K- decays. A measurement is also presented of the CP-odd fraction, F-, of the decay D0→KS0K+K- in the region of the ϕ→K+K- resonance. We find that in a region within 0.01  GeV2/c4 of the nominal ϕ mass squared F->0.91 at the 90% confidence level.

Observation of the hc(1P) Using e+e- Collisions above the DD̄ Threshold

Using 586  pb(-1) of e+ e- collision data at E(c.m.) = 4170  MeV, produced at the Cornell Electron Storage Ring collider and collected with the CLEO-c detector, we observe the process e+ e- → π+ π- h(c)(1P). We measure its cross section to be 15.6±2.3±1.9±3.0  pb, where the third error is due to the external uncertainty on the branching fraction of ψ(2S) → π0 h(c)(1P), which we use for normalization. We also find evidence for e+ e- → ηh(c)(1P) at 4170 MeV at the 3σ level and see hints of a rise in the e+ e- → π+ π- h(c)(1P) cross section at 4260 MeV.

Updated measurement of the strong phase in D0→K+π- decay using quantum correlations in e+e-→D0D̄0 at CLEO

We analyze a sample of 3 million quantum-correlated D0 D0bar pairs from 818 pb^-1 of e+e- collision data collected with the CLEO-c detector at E_cm = 3.77 GeV, to give an updated measurement of \cos\delta and a first determination of \sin\delta, where \delta is the relative strong phase between doubly Cabibbo-suppressed D0 --> K+pi- and Cabibbo-favored D0bar --> K+pi- decay amplitudes. With no inputs from other experiments, we find \cos\delta = 0.81 +0.22+0.07 -0.18-0.05, \sin\delta = -0.01 +- 0.41 +- 0.04, and |\delta| = 10 +28+13 -53-0 degrees. By including external measurements of mixing parameters, we find alternative values of \cos\delta = 1.15 +0.19+0.00 -0.17-0.08, \sin\delta = 0.56 +0.32+0.21 -0.31-0.20, and \delta = (18 +11-17) degrees. Our results can be used to improve the world average uncertainty on the mixing parameter y by approximately 10%.

Studies of the decays D0→KS0K−π+ and D0→KS0K+π−

The first measurements of the coherence factor RK⁰SKπ and the average strong–phase difference δK⁰SKπD in D⁰ → K⁰S K∓π± decays are reported. These parameters can be used to improve the determination of the unitary triangle angle in B⁻ → D¯K⁻ decays, where D¯ is either a D⁰ or a D¯⁰ meson decaying to the same final state, and also in studies of charm mixing. The measurements of the coherence factor and strong-phase difference are made using quantum-correlated, fully reconstructed D⁰D¯⁰ pairs produced in e⁺e⁻ collisions at the ψ(3770) resonance. The measured values are RK⁰SKπ = 0.73 ± 0.08 and δK⁰SKπD = (8.3 ± 15.2)° for an unrestricted kinematic region and RK*K = 1.00 ± 0.16 and δK*KD = (26.5 ± 15.8)° for a region where the combined K⁰Sπ± invariant mass is within 100 MeV/c² of the K*(892)± mass. These results indicate a significant level of coherence in the decay. In addition, isobar models are presented for the two decays, which show the dominance of the K*(892)± resonance. The branching ratio B(D⁰ → K⁰S K⁺π⁻)/B(D⁰ → K⁰S K⁻π⁺) is determined to be 0.592 ± 0.044(stat.) ± 0.018(syst.), which is more precise than previous measurements.J. Insler, H. Muramatsu, C. S. Park, L. J. Pearson, E. H. Thorndike, S. Ricciardi, C. Thomas, 3 M. Artuso, S. Blusk, R. Mountain, T. Skwarnicki, S. Stone, J. C. Wang, L. M. Zhang, G. Bonvicini, D. Cinabro, M. J. Smith, P. Zhou, T. Gershon, P. Naik, J. Rademacker, K. W. Edwards, K. Randrianarivony, R. A. Briere, H. Vogel, P. U. E. Onyisi, J. L. Rosner, J. P. Alexander, D. G. Cassel, S. Das, R. Ehrlich, L. Gibbons, S. W. Gray, D. L. Hartill, D. L. Kreinick, V. E. Kuznetsov, J. R. Patterson, D. Peterson, D. Riley, A. Ryd, A. J. Sadoff, X. Shi, W. M. Sun, J. Yelton, P. Rubin, N. Lowrey, S. Mehrabyan, M. Selen, J. Wiss, J. Libby, M. Kornicer, R. E. Mitchell, D. Besson, T. K. Pedlar, D. Cronin-Hennessy, J. Hietala, S. Dobbs, Z. Metreveli, K. K. Seth, A. Tomaradze, T. Xiao, D. Johnson, S. Malde, L. Martin, A. Powell, G. Wilkinson, D. M. Asner, G. Tatishvili, J. Y. Ge, D. H. Miller, I. P. J. Shipsey, B. Xin, G. S. Adams, J. Napolitano, and K. M. Ecklund

First measurement of the form factors in the decays D0→ρ- e+νe and D+→ρ0e+νe

The beauty to up quark coupling constant |V(ub)| can be extracted from B → ρ e+ ν(e) combined with the form factors for D → K* e+ ν(e) and B → V ℓ+ ℓ- and D → ρ e+ ν(e). Using the entire CLEO-c ψ(3770) → DD event sample, corresponding to an integrated luminosity of 818  pb(-1) and approximately 5.4×10(6) DD events, we measure the form factors for the decays D0 → ρ- e+ ν(e) and D+ → ρ0 e+ ν(e) for the first time and the branching fractions with improved precision. A four-dimensional unbinned maximum likelihood fit determines the form factor ratios to be V(0)/A1(0)=1.48±0.15±0.05 and A2(0)/A1(0)=0.83±0.11±0.04. Assuming Cabibbo-Kobayashi-Maskawa unitarity, the known D meson lifetimes, and our measured branching fractions we obtain the form factor normalizations A1(0), A2(0), and V(0). We also present a measurement of the branching fraction for D+ → ω e+ ν(e) with improved precision.

Measurements of branching fractions for electromagnetic transitions involving the χbJ(1P) states

Using (9.32, 5.88) million {Upsilon}(2S,3S) decays taken with the CLEO III detector, we obtain five product branching fractions for the exclusive processes {Upsilon}(2S){yields}{gamma}{chi}{sub b0,1,2}(1P){yields}{gamma}{gamma}{Upsilon}(1S) and {Upsilon}(3S){yields}{gamma}{chi}{sub b1,2}(1P){yields}{gamma}{gamma}{Upsilon}(1S). We observe the transition {chi}{sub b0}(1P){yields}{gamma}{Upsilon}(1S) for the first time. Using the known branching fractions for B[{Upsilon}(2S){yields}{gamma}{chi}{sub bJ}(1P)], we extract values for B[{chi}{sub bJ}(1P){yields}{gamma}{Upsilon}(1S)] for J=0, 1, 2. In turn, these values can be used to unfold the {Upsilon}(3S) product branching fractions to obtain values for B[{Upsilon}(3S){yields}{gamma}{chi}{sub b1,2}(1P)] for the first time individually. Comparison of these with each other and with the branching fraction B[{Upsilon}(3S){yields}{gamma}{chi}{sub b0}] previously measured by CLEO provides tests of relativistic corrections to electric dipole matrix elements.

Observation of the Dalitz decay Ds*+→Ds+e+ e-

Using 586

QUANTUM-CORRELATED MEASUREMENTS RELATED TO THE DETERMINATION OF γ/ϕ3

\textrm{pb}^{-1}

Search for the decay Ds+→ωe+ν

of

Branching fractions for γ(3S)→π0hb and ψ(2S)→πp0hc

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