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Étalonnage de l'algorithme d'étiquetage de la saveur par la mesure de sin (2b) dans LHCb

Abstract : The thesis objective is to develop a procedure for the calibration of LHCb's flavour tagging algorithm. This algorithm is fondamental for many CP violating parameters' measurements. The chosen reference measurement is sin(2b) because it is very well known. In the first part of this document, we present the theoretical context of this work, with a presentation of the origin of the CP violating observables of the Standard Model of particle physics. Then we present the experimental apparatus, the LHCb detector, with a review of its subdetectors. The third part decribes the flavour tagging algorithm, with a presentation of the chosen taggers, and the selection optimization. It also gives the expected performance. The next chapter discusses the selection procedure for one of the control channels used in the algorithm's optimization. The fifth part presents the procedure for the extraction of the wrong tag fraction from an other control channel. This wrong tag fraction is a fondamental parameter of the flavour taggign algorithm. Finally, the last chapter shows how this wrong tag fraction is used in the measurement of sin(2b), and what are the consequences of an error on this fraction. We show that with one year of data taking, le sensitivity to sin(2b) is sufficient to contrôle the flavour tagging algorithm.
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Contributor : Danielle Cristofol <>
Submitted on : Friday, November 6, 2009 - 10:30:30 AM
Last modification on : Thursday, January 18, 2018 - 1:55:10 AM
Long-term archiving on: : Thursday, June 17, 2010 - 7:34:38 PM


  • HAL Id : tel-00430205, version 1



Stèphane Poss. Étalonnage de l'algorithme d'étiquetage de la saveur par la mesure de sin (2b) dans LHCb. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université de la Méditerranée - Aix-Marseille II, 2009. Français. ⟨tel-00430205⟩



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