Malcolm John

Abstract:

We report on the inclusive branching fractions of B- and of B̄0 mesons decaying to D0X, D̄0X, D+X, D-X, Ds+X, Ds-X, Λc+X, Λc-X, based on a sample of 88.9 × 106 BB̄ events recorded with the BABAR detector at the Υ (4S) resonance. Events are selected by completely reconstructing one B and searching for a reconstructed charmed particle in the rest of the event. We measure the number of charmed and of anticharmed particles per B decay and derive the total charm yield per B - decay nc- = 1.313 ± 0.037 ± 0.062-0.042+0.063 and per B̄0 decay n c0 = 1.276 ± 0.062 ± 0.058 -0.046+0.066, where the first uncertainty is statistical, the second is systematic, and the third reflects the charm branching-fraction uncertainties.

Abstract:

We present a measurement of the branching fraction of the decay B ^±→χc0K^± sample of 89×10⁶ BB̄ pairs collected by the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. The χc0 meson is reconstructed through its two-body decays toπ⁺ π^- and K⁺K^-. We measure B(B^± → χc0K^±) ×Β(χ c0→π⁺π^-) = [1.32-027 ^+0.28(stat)±0.26(syst)] × 10^-6 and B(B ^±→ χc0K^±) × B(χc0 →K⁺K^-) = [1.49 -0.34^+0.36(stat) ±0.22(syst)] × 10 -6. Using the known values for the χc0 decays branching fractions, we combine these results to obtain Β(B ^± →χc0K^±) = (2.7±0.7)× 10^-4. © 2004 The American Physical Society.

Abstract:

Branching fraction measurements using B-meson decays to Ks ⁰π⁺π^- are presented. These measurements were obtained by analyzing a data sample of 88.9 × 10⁶ Υ(45) → BB̄ decays collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. Using a maximum likelihood fit, the following branching fraction results were obtained: B(B⁰π ⁺π^-) = (43.7 ± 3.8 ± 3.4) × 10 ^-6, B(B⁰ → K*⁺π^-) (12.9 ± 2.4 ± 1.4) × 10^-6, and B(B⁰ → D^-(→Ks ⁰π⁺π ^-)π⁺) = (42.7 ± 2.1 ± 2.2) × 10^-6. The CP violating charge asymmetry AK*π for the decay B⁰ → K*⁺π^- was measured to be AK*π = 0.23 ± 0.18-0.06 ^+0.09. For all these measurements the first error is statistical and the second is systematic.

Abstract:

We present results of searches for 5-meson decays to K⁺π ^-π⁺ with the BABAR detector. With a data sample of 61.6 × 10⁶ BB̄ pairs, we measure the branching fractions and 90% confidence-level upper limits averaged over charge-conjugate states (the first error is statistical and the second is systematic): B[B⁺ → K*⁰(892)π⁺] = (15.5 ± 1.8 -4.0^+1.5) × 10^-6, B[B⁺ → f0(980)K⁺, f0 → π⁺π ^-] = (9.2 ± 1.2-2.6^+2.1) × 10 ^-6, B[B⁺ → D̄⁰π⁺, D̄⁰ → K⁺π^-] = (184.6 ± 3.2 ± 9.7) × 10^-6, B[B⁺ → ρ⁰(770)K⁺] < 6.2 × 10^-6 and B[B⁺ → K⁺π^-π⁺ nonresonant] < 17 × 10^-6.

Abstract:

We present a search for B decays to charmless final states involving charged or neutral a0 mesons. The data sample corresponds to 89 × 10⁶ BB̄ pairs collected with the BABAR detector operating at the PEP-II asymmetric-energy B Factory at Stanford Linear Accelerator Center. We find no significant signals and determine the following 90% C.L. upper limits: B(B⁰ → a0 ^-π⁺) < 5.1 × 10^-6, B(B⁰ → a0^-K⁺) < 2.1 × 10^-6, B(B^- → a0^-K̄⁰) < 3.9 × 10^-6, B(B⁺ → a0 ⁰π⁺) < 5.8 × 10^-6, B(B⁺ → a0⁰K⁺) < 2.5 × 10^-6, and B(B⁰ → a0⁰K⁰) < 7.8 × 10^-6, where in all cases B indicates the product of branching fractions for B → a0X and a0 ηπ, where X indicates K or π.