Results 1 - 10 of 9315
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[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 χc. 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*- KS0, 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 Bs0Bs0 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 Bs reconstruction modes on these fast oscillations and derive general formulae for the experimental measurement. An alternative approach using the lifetime difference between Bs 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 Bs0Bs0 mixing measurements
[en] We consider anomaly cancellations in Type IIB orientifolds on T4/ZN 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 2b/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 2b/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 ACP(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+ → χc0K+ 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