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Etude de la violation de CP dans les desintegrations B+ en DK*+ sur l'experience BaBar a SLAC

Abstract : Using a luminosity of 210.7fb-1 integrated at the Upsilon(4S) resonance with BaBar experiment, we exclusively reconstruct the B+ to D K*+ decay for constraining the angle Gamma of the unitarity triangle. Following the method discribed by Gronau, London et Wyler, the D meson is reconstructed in CP eigenstates : K+K-, pi+pi-, et Kspi0, KsPhi, KsOmega. The interference between amplitudes \bar b to \bar c u \bar s and \bar b \to \bar u c \bar s, which contribute to the final states, is the origin of the sensitivity on Gamma. The technical difficulty comes from the suppression of the second amplitude compared to the first one, which we expect a ratio of the order of 0.1. The small ratio of rB limits the impact on the Gamma measurement. Physical observables for this method have been measured : Acpp = -0,08 +/- 0,19 (stat.) +/- 0,08 (syst.) Acpm = -0,26 +/- 0,40 (stat.) +/- 0,12 (syst.) Rcpp = 1,96 +/- 0,40 (stat.) +/- 0,11 (syst.) Rcpm = 0,65 +/- 0,26 (stat.) +/- 0,08 (syst.) An update of the branching ratio is also proposed : BR(B- -> D0K*-) = (5,31 +/- 0,29 (stat.) +/- 0,37 (syst.)) 10-4
keyword : BaBar SLAC
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Contributor : Guillaume Therin <>
Submitted on : Thursday, September 8, 2005 - 11:47:54 AM
Last modification on : Friday, April 10, 2020 - 5:29:03 PM
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  • HAL Id : tel-00010059, version 3

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Guillaume Therin. Etude de la violation de CP dans les desintegrations B+ en DK*+ sur l'experience BaBar a SLAC. Physique des Hautes Energies - Expérience [hep-ex]. Université Paris-Diderot - Paris VII, 2005. Français. ⟨tel-00010059v3⟩

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