J. J. Regensburger

Search for Second-Class Currents in τ−→ωπ−ντ

Bernard Aubert, Y. Karyotakis, J. P. Lees, V. Poireau et autres

We report an analysis of ${\ensuremath{\tau}}^{\ensuremath{-}}$ decaying into $\ensuremath{\omega}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ with $\ensuremath{\omega}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ using a data sample containing nearly $320\ifmmode\times\else\texttimes\fi{}{10}^{6}\ensuremath{\tau}$ pairs collected with the BABAR detector at the PEP-II $B$-Factory. We find no evidence for second-class currents, and we set an upper limit of …

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Constraints on the CKM angle γ in B0→D¯0K*0 and B0→D0K*0 from a Dalitz analysis of D0 and D¯0 decays to KSπ+π−

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

We present constraints on the angle $\ensuremath{\gamma}$ of the unitarity triangle with a Dalitz analysis of neutral $D$ decays to ${K}_{S}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ from the processes ${B}^{0}\ensuremath{\rightarrow}{\overline{D}}^{0}{K}^{*0}$ (${\overline{B}}^{0}\ensuremath{\rightarrow}{D}^{0}{\overline{K}}^{*0}$) and ${B}^{0}\ensuremath{\rightarrow}{D}^{0}{K}^{*0}$ (${\overline{B}}^{0}\ensuremath{\rightarrow}{\overline{D}}^{0}{\overline{K}}^{*0}$) with ${K}^{*0}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ (${\overline{K}}^{*0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$). Using a sample of $371\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected with the …

Improved Measurement of B+→ρ+ρ0 and Determination of the Quark-Mixing Phase Angle α

Bernard Aubert, Y. Karyotakis, J. P. Lees, V. Poireau et autres

We present improved measurements of the branching fraction $\mathcal{B}$, the longitudinal polarization fraction ${f}_{L}$, and the direct $CP$ asymmetry ${\mathcal{A}}_{CP}$ in the $B$ meson decay channel ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{+}{\ensuremath{\rho}}^{0}$. The data sample was collected with the BABAR detector at SLAC. The results are $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{+}{\ensuremath{\rho}}^{0})=(23.7\ifmmode\pm\else\textpm\fi{}1.4\ifmmode\pm\else\textpm\fi{}1.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, …

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Evidence for B+→K¯*0K*+

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

We present measurements of the branching fraction and fraction of longitudinal polarization for the decay B^+ K^(*0)K^(*+) with a sample of (467±5)×10^6 BB pairs collected with the BABAR detector at the PEP-II asymmetric-energy e^+e^- collider at the SLAC National Accelerator Laboratory. We …

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Measurement of time dependent CP asymmetry parameters in B0 meson decays to ωKS0 , η′K0 , and π0KS0

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

We present measurements of the time-dependent $CP$-violation parameters $S$ and $C$ in the decays ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\omega}{K}_{S}^{0}$, ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{K}^{0}$, reconstructed as ${\ensuremath{\eta}}^{\ensuremath{'}}{K}_{S}^{0}$ and ${\ensuremath{\eta}}^{\ensuremath{'}}{K}_{L}^{0}$, and ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{K}_{S}^{0}$. The data sample corresponds to the full BABAR dataset of $467\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs produced at the PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ …

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Branching fractions and CP -violating asymmetries in radiative B decays to ηKγ

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

We present measurements of the $CP$-violation parameters $S$ and $C$ for the radiative decay ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\eta}{K}_{S}^{0}\ensuremath{\gamma}$; for $B\ensuremath{\rightarrow}\ensuremath{\eta}K\ensuremath{\gamma}$ we also measure the branching fractions and for ${B}^{+}\ensuremath{\rightarrow}\ensuremath{\eta}{K}^{+}\ensuremath{\gamma}$ the time-integrated charge asymmetry ${\mathcal{A}}_{ch}$. The data, collected with the BABAR detector at the Stanford Linear …

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Search for B→K*νν¯ decays

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

We present a search for the decays $B\ensuremath{\rightarrow}{K}^{*}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ using $454\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ pairs collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the BABAR detector at the SLAC PEP-II $B$-Factory. We first select an event sample where one $B$ is reconstructed in a semileptonic or hadronic mode …

Dalitz plot analysis of the decay B0(B¯0)→K±π∓π0

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

We report a Dalitz-plot analysis of the charmless hadronic decays of neutral $B$ mesons to ${K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}{\ensuremath{\pi}}^{0}$. With a sample of $(231.8\ifmmode\pm\else\textpm\fi{}2.6)\ifmmode\times\else\texttimes\fi{}{10}^{6}\mathit{\ensuremath{\Upsilon}}(4S)\ensuremath{\rightarrow}B\overline{B}$ decays collected by the BABAR detector at the PEP-II asymmetric-energy $B$ Factory at SLAC, we measure the magnitudes and phases of …

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Study of B -meson decays to ηcK(*) , ηc(2S)K(*) , and ηcγK(*)

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

We study two-body $B$-meson decays to a charmonium state (${\ensuremath{\eta}}_{c}$, ${\ensuremath{\eta}}_{c}(2S)$ or ${h}_{c}$) and a ${K}^{+}$ or ${K}^{*0}(892)$ meson using a sample of $349\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected with the BABAR detector at the PEP-II asymmetric-energy $B$ Factory at the Stanford …

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Study of B→X(3872)K , with X(3872)→J/ψπ+π−

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

We present measurements of the decays ${B}^{+}\ensuremath{\rightarrow}X(3872){K}^{+}$ and ${B}^{0}\ensuremath{\rightarrow}X(3872){K}^{0}$ with $X(3872)\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$. The data sample used, collected with the BABAR detector at the PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ asymmetric-energy storage ring, corresponds to $455\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ pairs. Branching fraction measurements of $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}X(3872){K}^{+})\ifmmode\times\else\texttimes\fi{}\mathcal{B}(X(3872)\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})=(8.4\ifmmode\pm\else\textpm\fi{}1.5\ifmmode\pm\else\textpm\fi{}0.7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ and $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}X(3872){K}^{0})\ifmmode\times\else\texttimes\fi{}\mathcal{B}(X(3872)\ensuremath{\rightarrow}J/\ensuremath{\psi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})=(3.5\ifmmode\pm\else\textpm\fi{}1.9\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ are obtained. We set …

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Measurements of e + e − → K + K − η , K + K − π 0 , and K s 0 K ± π ∓ cross sections using initial state radiation events

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

This paper reports measurements of processes: ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\gamma}{K}_{S}^{0}{K}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\pi}}^{\ensuremath{\mp}}$, ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\gamma}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$, ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\phi}\ensuremath{\eta}$, and ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\phi}{\ensuremath{\pi}}^{0}$. The initial-state radiated photon allows to cover the hadronic final state in the energy range from thresholds up to $\ensuremath{\approx}4.6\text{ }\text{ }\mathrm{GeV}$. The overall size of the data sample analyzed is …

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Search for prompt production of χc and X(3872) in e+e− annihilations

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

We have searched for prompt production of ${\ensuremath{\chi}}_{c1}$, ${\ensuremath{\chi}}_{c2}$ and $X(3872)$ in continuum ${e}^{+}{e}^{\ensuremath{-}}$ annihilations using a $386\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected around $\sqrt{s}=10.6\text{ }\text{ }\mathrm{GeV}$ with the BABAR detector using the $\ensuremath{\gamma}J/\ensuremath{\psi}$ decay mode. After accounting for the feed-down from …