# A measurement of CP-violation parameters in $B^0\bar{B}^0$ mixing using partially reconstructed $D^{*-} \ell^+ \nu_{\ell}$ events at BaBar

Abstract : CP violation in B0B0bar mixing is characterized by the value of the parameter |q/p| being different from 1, and the Standard Model predicts this difference to be smaller than 10^{-3}. We present a measurement of this parameter using a partial reconstruction of one of the B mesons in the semileptonic channel D*- l+ nu_l, where only the hard lepton and the soft pion from the D*- --> D0bar pi- decay are reconstructed. The flavor of the other B is determined by means of lepton tagging. The determination of |q/p| is then performed with a fit to the proper time difference of the two B decays. We use a luminosity of 200.8 fb^-1, collected at the Y(4S) resonance by the BaBar detector at the PEP-II asymmetrical-energy e+e- collider, in the period 1999-2004. We obtain the preliminary result: |q/p| - 1 = (6.5 +/- 3.4(stat.) +/- 2.0(syst.)) x 10^{-3}
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00118664
Contributor : Dominique Girod <>
Submitted on : Wednesday, December 6, 2006 - 9:58:42 AM
Last modification on : Saturday, May 22, 2021 - 3:33:44 AM

### Citation

B. Aubert, R. Barate, M. Bona, D. Boutigny, F. Couderc, et al.. A measurement of CP-violation parameters in $B^0\bar{B}^0$ mixing using partially reconstructed $D^{*-} \ell^+ \nu_{\ell}$ events at BaBar. 33rd International Conference on High-Energy Physics, ICHEP 06, Jul 2006, Moscou, Russia. ⟨in2p3-00118664⟩

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