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Etude de la production de eta' de haute impulsion dans les désintégrations du méson B dans l'experience BaBar

Abstract : The work presented in this thesis relies on the analysis of data collected between october 1999 and July 2002 by the BaBar experiment at the PEP-II collider located at SLAG (Stanford, California). Electron-positron collisions at a center of mass energy equal to the Y (4S) resonance mass are used for the production of B meson pairs.

In July 2001, the BaBar collaboration published the first measurement of CP violation in the neutral B mesons system. Since then, the precision of the measurement has been continually being improved with the increasing data sample. Two devices are dedicated to the reconstruction of charged particles : the Silicon Vertex Tracker and the Drift Chamber. The Silicon Vertex Tracker is crucial for the reconstruction of the B meson decay vertex. Its motion with regard to the Drift Chamber needs a rolling calibration of the corresponding alignment parameters roughly every two hours. The relation between the Drift Chamber geometry and the alignment has been studied.

Beside CP violation, Heavy Flavour Physics is an other important issue of BaBar research program. Rare decays are of particular interest as they are sensible to a new physics beyond the Standard Model.

The production of high energy eta' in B decays has been studied through the two main contributions, B -> eta' Xs coming from the rare decay b -> s g*, and B0bar -> eta' D0 coming from the internal tree color-suppressed decay b -> c ubar d. The improvement of the measurement of the process B -> eta' Xs and the first observation of the decay B0bar -> eta' D0 have lead to the conclusion that the eta' production is dominated by the decay b -> s g* and enables to constrain its quark content.
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Submitted on : Monday, June 16, 2003 - 3:44:50 PM
Last modification on : Friday, November 6, 2020 - 3:27:39 AM
Long-term archiving on: : Friday, April 2, 2010 - 7:16:53 PM

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  • HAL Id : tel-00003014, version 1

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Adlène Hicheur. Etude de la production de eta' de haute impulsion dans les désintégrations du méson B dans l'experience BaBar. Physique des Hautes Energies - Expérience [hep-ex]. Université de Savoie, 2003. Français. ⟨tel-00003014⟩

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