Etude du potentiel de l'expérience LHCb pour la découverte de la physique au delà du Modèle standard dans la désintegration B^0_d -> phi K^0_S

Abstract : The Standard Model predicts the same time-dependant CP asymmetry in both Bd0 -> J/Psi KS0 and Bd0 -> Phi KS0 decays. This asymmetry is proportional to sin(2 beta). Any difference between the CP asymmetries measured in these 2 channels would indicate the presence of new phenomena beyond the Standard Model. We study the sensitivity of the LHCb experiment to this effect. To that end, we estimate the statistical error on the measurement of sin(2 beta) in the Bd0 -> Phi KS0 channel by LHCb. We do that with the LHCb classic detector, and then with the reoptimized detector. The number of simulated background events is too small with respect to the annual statistics to obtain precise evaluations. We developped several methods to improve these evaluations. In the most optimistic case, we predict that sin(2 beta) would be measured in the LHCb classic configuration with a statistical error equal to 0.56. With the reoptimized detector, this error is further improved: 0.29.
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https://tel.archives-ouvertes.fr/tel-00005326
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Submitted on : Friday, March 12, 2004 - 12:34:28 PM
Last modification on : Wednesday, January 23, 2019 - 10:18:07 AM
Long-term archiving on : Friday, April 2, 2010 - 9:00:32 PM

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  • HAL Id : tel-00005326, version 1

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Benoit Viaud. Etude du potentiel de l'expérience LHCb pour la découverte de la physique au delà du Modèle standard dans la désintegration B^0_d -> phi K^0_S. Physique des Hautes Energies - Expérience [hep-ex]. Université de la Méditerranée - Aix-Marseille II, 2003. Français. ⟨tel-00005326⟩

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