R. Messner

Limits on τ lepton-flavor violating decays into three charged leptons

J. P. Lees, V. Poireau, Elisabetta Prencipe, V. Tisserand et autres

A search for the neutrinoless, lepton-flavor violating decay of the $\ensuremath{\tau}$ lepton into three charged leptons has been performed using an integrated luminosity of $468\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with the BABAR detector at the PEP-II collider. In all six decay modes considered, …

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Measurement of the branching fraction, polarization, and CP asymmetries in B0→ρ0ρ0 decay, and implications for the CKM angle α

Bernard Aubert, M. Bóna, Y. Karyotakis, J. P. Lees et autres

We study ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}{\ensuremath{\rho}}^{0}$ decays in a sample of $465\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\Upsilon}(4S)\ensuremath{\rightarrow}B\overline{B}$ events collected with the BABAR detector at the PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider located at the Stanford Linear Accelerator Center (SLAC). We measure the branching fraction $\mathcal{B}=(0.92\ifmmode\pm\else\textpm\fi{}0.32\ifmmode\pm\else\textpm\fi{}0.14)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ and longitudinal polarization fraction ${f}_{L}={0.75}_{\ensuremath{-}0.14}^{+0.11}\ifmmode\pm\else\textpm\fi{}0.05$, where …

Improved measurement of time-dependent CP asymmetries and the CP -odd fraction in the decay B0→D*+D*−

Bernard Aubert, M. Bóna, D. Boutigny, Y. Karyotakis et autres

We present an updated measurement of the $CP$-odd fraction and the time-dependent $CP$ asymmetries in the decay ${B}^{0}\ensuremath{\rightarrow}{D}^{*+}{D}^{*\ensuremath{-}}$ using $(383\ifmmode\pm\else\textpm\fi{}4)\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ pairs collected with the BABAR detector. We determine the $CP$-odd fraction to be $0.143\ifmmode\pm\else\textpm\fi{}0.034(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.008(\mathrm{syst})$. The time-dependent $CP$ asymmetry parameters are determined to …

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Observation of B Meson Decays to b1π and b1K

Bernard Aubert, M. Bóna, D. Boutigny, Y. Karyotakis et autres

We present the results of searches for decays of $B$ mesons to final states with a ${b}_{1}$ meson and a charged pion or kaon. The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent $382\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs produced …

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Search for B+→τ+ν

Bernard Aubert, M. Bóna, D. Boutigny, Y. Karyotakis et autres

We present a search for the decay ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}\ensuremath{\nu}$ using $383\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ pairs collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the BABAR detector at the SLAC PEP-II $B$-Factory. A sample of events with one reconstructed semileptonic $B$ decay (${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{0}\ensuremath{\ell}\ensuremath{-}{\overline{\ensuremath{\nu}}}_{\ensuremath{\ell}}X$) is selected, and in the recoil …

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Precise branching ratio measurements of the decays D0→π−π+π0 and D0→K−K+π0 relative to the D0→K−π+π0 decay

Bernard Aubert, R. Barate, M. Bóna, D. Boutigny et autres

Using $232\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collision data recorded by the BABAR experiment, we measure the rates of three-body Cabibbo-suppressed decays of the ${D}^{0}$ meson relative to the Cabibbo-favored decay, ${D}^{0}\ensuremath{\rightarrow}\phantom{\rule{0ex}{0ex}}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$. We find: $\frac{B({D}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0})}{B({D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0})}=(10.59\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.13)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$ and $\frac{B({D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{K}^{+}{\ensuremath{\pi}}^{0})}{B({D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0})}=(2.37\ifmmode\pm\else\textpm\fi{}0.03\ifmmode\pm\else\textpm\fi{}\phantom{\rule{0ex}{0ex}}0.04)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}2}$, where the errors are statistical and …

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