Développement de détecteur gazeux à micropistes pour le trajectographe de l'expérience CMS et mesures de rapports d'embranchement de désintégrations hadroniques du méson B dans l'expérience BaBar

Abstract : The Compact Muon Solenoid (CMS) is one of the two detectors, designed for the search of the HIGGS boson at the Large Hadron Collider (LHC), to operate late 2007 at CERN. Micro Strip Gas Counters (MSGC) have been extensively studied to qualify as part of the CMS tracker. When exposed to highly ionizing particles and to high rates of incident particles, MSGCs have shown a good behavior allowing them to cope with the LHC environment. Similar micropattern gaseous detectors such as Gas Electron Multiplier (GEM) and Micro Mesh gas detectors (MicroMegas) are developed to be used in high energy physics.
BaBar, the detector for the SLAC PEP-II asymmetric e+e- B Factory operating at the Y(4S) resonance, was designed to allow comprehensive studies of CP-violation in B-meson decays. First observation of CP violation has been realized in 2001. Since then an impressive amount of B decays measurements has been performed. Among those, we present here the branching fraction measurements of charged and neutral B decays to Dpi-, D*pi-, and D**pi- with a missing mass method, based on a sample of 231 million Y(4S) → BB pairs. In order to do this, one of the B mesons is fully reconstructed and the "recoil" one decays to a reconstructed charged pion and a companion charmed meson identified by its recoil mass, inferred by kinematics. The same sample is used to reconstruct charmed mesons (D, Ds) and baryons (Λc ) in the "recoil side" allowing the measurement of the charm number in the B decays.
Document type :
Habilitation à diriger des recherches
High Energy Physics - Experiment. Université de Savoie, 2007


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Contributor : Amina Zghiche <>
Submitted on : Monday, November 26, 2007 - 6:13:08 PM
Last modification on : Monday, November 26, 2007 - 8:58:00 PM

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A. Zghiche. Développement de détecteur gazeux à micropistes pour le trajectographe de l'expérience CMS et mesures de rapports d'embranchement de désintégrations hadroniques du méson B dans l'expérience BaBar. High Energy Physics - Experiment. Université de Savoie, 2007. <tel-00192103>

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