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Etude des désintegrations doublement charmées des mésons B avec l'expérience BaBar à SLAC

Abstract : The BABAR experiment at SLAC has been studying since 1999 B meson decays
from e+e- colisions at the Upsilon(4S) resonance. The first goal of the collaboration
was to measure the sin (2 beta) CP-violation parameter within the standard model.
This measurement requires to know with precision the absolute length scale of
the detector. A method to test this scale was developped using nuclear interactions
in the beam-pipe material. The longitudinal length scale was then determined at
the 1 % level precision. The systematic error associated with length measurement
in the detector concerning B meson lifetime and B meson oscillation frequency is
then negligible with respect to the other errors.

The K meson content of B decays is a key ingredient of the sin (2 beta) measurement
and is used to tag the flavour of the other B in events containing a B
decaying to a CP eigenstate. The K charge is correlated to the B flavour. Wrong
sign kaons, which can dilute B tagging, can come from wrong sign D decays
(B -> D X). Doubly charmed decays B -> DDbar K are one possibility to produce wrong sign D decays. The twenty-two decay modes are reconstructed exclusively. The total branching fraction is measured with enough precision to establish that B -> DDbar K decays are not the only source of wrong sign D mesons in B decays.
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Submitted on : Tuesday, September 3, 2002 - 4:53:11 PM
Last modification on : Friday, November 6, 2020 - 3:27:26 AM
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  • HAL Id : tel-00001613, version 1



Patrick Robbe. Etude des désintegrations doublement charmées des mésons B avec l'expérience BaBar à SLAC. Physique des Hautes Energies - Expérience [hep-ex]. Université de Savoie, 2002. Français. ⟨tel-00001613⟩



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