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Abstract:

We study the decays B⁺ → ηcK⁺ and B⁰ → ηcK⁰, where the ηc is reconstructed in the KS⁰K ^±π^∓ and K⁺K^- Ï€⁰ decay modes. Results are based on a sample of 86 B µþÌ„ pairs collected with the BABAR detector at the SLAC e⁺e^- B Factory. We measure the product of branching fractions B(B⁺ → ηcK⁺) ×B(ηc→KKÌ„Ï€)= (7.40±0.50±0.70)×10^-5 and B(B ⁰→ηcK⁰) ×B(ηc→KKÌ„Ï€)=(6.48±0.85±0.71) ×10^-5, where the first error is statistical and the second is systematic, In addition, we search for B → ηcK events with ηc→2(°­⁺K^-) and ηc→ φφ and determine the ηc decay branching fraction ratios B(ηc →(°­⁺K^-)) /B(ηc→KKÌ„Ï€)=(2.3±0.7±0.6) ×10^-2 and B(ηc→φφ) /B(ηc→KKÌ„Ï€)=(5.5±1.4±0.5) ×10^-2.

Abstract:

Using events in which one of two neutral B mesons from the decay of an Y(4S) resonance is fully reconstructed, we set limits on the difference between the decay rates of the two neutral B mass eigenstates and on CP, T, and CPT violation in B0µþÌ„0 mixing. The reconstructed decays, comprising both CP and flavor eigenstates, are obtained from 88 million Y(4S)→BµþÌ„ decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We determine six independent parameters governing oscillations (Δm,ΔΓ/Γ), CPT and CP violation (Re z,Im z), and CP and T violation (Im λCP,|q/p|), where λCP characterizes B0 and µþÌ„0 decays to states of charmonium plus KS0 or KL0. The results are sgn(Re λCP)ΔΓ/ Γ=-0.008±0.037(stat.)±0.018(syst.)[-0.084,0.068], |q/p|=1.029±0.013(stat.)±0.011(syst.)[1.001,1.057], (Re λCP|λCP|)Re z=0.014±0.035(stat.) ±0.034(syst.)[-0.072,0.101], Im z=0.038±0.029(stat.)±0.025 (syst.)[-0.028,0.104]. The values inside square brackets indicate the 90% confidence-level intervals. The values of Im λCP and Δm are consistent with previous analyses and are used as cross checks. These measurements are in agreement with standard model expectations.

Abstract:

The branching fractions of the decays B0 → K*0 γ and B+ → K*+ γ are measured using a sample of 88 × 106BµþÌ„ events collected with the BABAR detector at the PEP-II asymmetric-energy e +e- collider. We find B(B0 → K* γ) = [3.92 ± 0.20(stat) ± 0.24(syst)] × 10 -5, B(B+ → K*+ γ) = [3.87 ± 0.28(stat) ± 0.26(syst)] × 10-5. Our measurements also constrain the direct CP asymmetry to be -0.074 < A(B → K* γ) < 0.049 and the isospin asymmetry to be -0.046 < Δ0-̈ < 0.146, both at the 90% confidence level.

Abstract:

We have investigated the exclusive, radiative B meson decays to K 2*(1430) in 89 × 10⁶ BµþÌ„ events with the BABAR detector at the PEP-II storage ring. We measure the branching fractions B(B⁰ → K2*(1430)⁰γ) = (1.22 ± 0.25 ± 0.10) × 10^-5 and B(B⁺ → K2*(1430)⁺γ) = (1.45 ± 0.40 ± 0.15) × 10^-5, where the first error is statistical and the second systematic. In addition, we measure the CP-violating asymmetry A CP[B⁰ → K2*(1430) ⁰γ] = -0.08 ± 0.15 ± 0.01.