# Measurement of the $B^{0}$ meson properties using partially reconstructed $B^{0} \to D^{*-}\pi^{+}$ and $B^{0} \to D^{*-}l^{+}\nu$ decay with the BABAR detector

Abstract : The two B^0 decay processes B^0 --> D^{*-}pi^+ and B^0 --> D^{*-}l^+nu have been studied by means of a partial reconstruction technique using a data sample collected with the BABAR detector at the PEP-II storage ring. To increase statistics, only the soft pi^- from the decay D^{*-} --> pi^-D^0 was used in association with either an oppositely-charged high-momentum pion or lepton. Events were then identified by exploiting the constraints from the simple kinematics of Y(4S) decays. A clear signature is obtained in each case. The position of the B^0 decay point was obtained from the reconstructed pi^+(l^+)pi^- vertex. The position of the other anti-B^0 in the event was also determined. Taking advantage of the boost given to the Y(4S) system by the asymmetric beam energies of PEP-II, the lifetime of the B^0 meson has been measured from the separation distance between the two vertices along the beam direction. The preliminary results are tau_B0 = 1.55+/-0.05+/-0.07 ps, tau_B0 = 1.62+/-0.02+/-0.09 ps, respectively for the B^0 --> D^{*-}pi^+ and B^0 --> D^{*-}l^+nu channels.
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00006098
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Submitted on : Tuesday, September 19, 2000 - 4:48:02 PM
Last modification on : Saturday, October 9, 2021 - 3:59:51 AM

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### Citation

B. Aubert, A. Boucham, D. Boutigny, I. de Bonis, J. Favier, et al.. Measurement of the $B^{0}$ meson properties using partially reconstructed $B^{0} \to D^{*-}\pi^{+}$ and $B^{0} \to D^{*-}l^{+}\nu$ decay with the BABAR detector. International Conference on High-Energy Physics 30 ICHEP 2000, Jul 2000, Osaka, Japan. pp.1-20. ⟨in2p3-00006098⟩

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