[en] We report an analysis of charmless hadronic decays of charged B mesons to the final state K⁺π⁰π⁰, using a data sample of 470.9 ± 2.8 million B(bar B) events collected with the BABAR detector at the Υ(4S) resonance. We observe an excess of signal events with a significance above 10 standard deviations including systematic uncertainties and measure the branching fraction to be Β(B⁺→K⁺π⁰π⁰) = (15.5 ± 1.1 ± 1.6) x 10^-6, where the uncertainties are statistical and systematic, respectively.

[en] The authors present a preliminary measurement of the time-dependent CP-violating asymmetry in decays of neutral B mesons to the final states D*^±π^±, using approximately 178 million B(bar B) events recorded by the BABAR experiment at the PEP-II d⁺e^- storage ring. Events containing these decays are selected with a partial reconstruction technique, in which only the high-momentum π^± from the B decay and the low-momentum π^±. from the D*^±. decay are used. They measure the amplitude of the asymmetry to be -0.041 ± 0.016 (stat.) ± 0.010 (syst.) and determine bounds on |sin(2β+γ)|

[en] Some recent results in hadron physics from the BaBar experiment are discussed. In particular, the observation of two new charmed states, the D*_sJ⁺(2317) and the D*_sJ⁺(2457), is described, and results are presented on the first measurement of the rare decay mode of the B meson, B⁰ π⁰π⁰

[en] We present results from BaBar experiment for the measurement of inclusive and exclusive branching fractions of B mesons into final states containing J/ψ, ψ(2S) and χ_c. The contributions of CP even and odd amplitudes in the decay B⁰ → J/ψK*⁰ are determined from an angular analysis. We report the measurements of the branching ratios B⁰ → D*⁺D*^- and D*⁺ D*^- K_S⁰, and the study of exclusive two-body and quasi-two-body charmless decays. The branching fraction of the decay B⁰ → K*⁰γ has been determined and the corresponding CP asymmetry has been measured

[en] The direct measurement of B_s⁰B_s⁰ mixing can be achieved by detecting fast oscillations in the time distribution of the data. The measurements from current high-energy experiments have obtained very limited results due to severe experimental requirements. We study the effects of detector resolutions and B_s reconstruction modes on these fast oscillations and derive general formulae for the experimental measurement. An alternative approach using the lifetime difference between B_s weak eigenstates is also studied in detail and is found to complement the oscillation measurement. Our results provide a method to optimize future high-energy B meson experiments for B_s⁰B_s⁰ mixing measurements

[en] We consider anomaly cancellations in Type IIB orientifolds on T⁴/Z_N with quantized NS-NS sector background B-flux. For a rank b B-flux on T⁴ (b is always even) and when N is even, the cancellation requires a 2^b/2 multiplicity of states in the 59-open string sector. We identify the twisted sector R-R scalars and tensor multiplets which are involved in the Green-Schwarz mechanism. We give more details of the construction of these models and argue that consistency with the 2^b/2 multiplicity of 59-sector states requires a modification of the relation between the open string 1-loop channel modulus and the closed string tree channel modulus in the 59-cylinder amplitudes

[en] We report an analysis of charmless hadronic decays of charged B mesons to the final state K⁺π⁰π⁰, using a data sample of (470.9 ± 2.8) x 10⁶ B(bar B) events collected with the BABAR detector at the Γ(4S) resonance. We observe an excess of signal events, with a significance above 10 standard deviations including systematic uncertainties, and measure the branching fraction and CP asymmetry to be Β(B⁺ → K⁺π⁰π⁰) = (16.2 ± 1.2 ± 1.5) x 10^-6 and A_CP(B⁺ → K⁺π⁰π⁰) = -0.06 ± 0.06 ± 0.04, where the uncertainties are statistical and systematic, respectively. Additionally, we study the contributions of the B⁺ → K⁺(892)⁺π⁰, B⁺ → f₀(980)K⁺, and B⁺ → χ_c0K⁺ quasi-two-body decays. We report the world's best measurements of the branching fraction and CP asymmetry of the B⁺ → K⁺π⁰π⁰ and B⁺ → K⁺(892)⁺π⁰ channels.

[en] B decays which are Cabibo and color suppressed, such as B → ψρ and B → ψπ, provide crucial tests of the understanding of rare decays of B-flavored mesons within the framework of the Standard Model and may play a role in discovery of direct CP violation in charged B decays. The decay modes B → ψρ and B → ψπ have been studied with a data sample of ∼ 2fb^-1 accumulated at the Υ(4s) with the CLEO II detector. Results on branching fractions will be reported together with their implications for the theoretical understanding of these decays

[en] We present a measurement of time-dependent CP-violating asymmetries in decays of neutral B mesons to the final states D*^±, using approximately 82 million B(bar B) events recorded by the BABAR experiment at the PEP-II e⁺e^- storage ring. Events containing these decays are selected with a partial reconstruction technique, in which only the high-momentum π^± from the B decay and the low-momentum π^± from the D*^± decay are used. We measure the amplitude of the asymmetry to be -0.063 ± 0.024 (stat.) ± 0.014 (syst.) and compute bounds on |sin(2β + γ)|

[en] Physicists' attention is increasingly turning to the high luminosity frontier - providing enough collisions to amass sizable numbers of rare events - to complement the traditional quest for higher energies. This month we cover three areas where projects are now being considered: Phi-factory workshop, PSI Planning for B meson factory, Tau-charm factory