Skip to Main content Skip to Navigation
New interface
Theses

Analyse du canal Λb → Λ + J/Ψ et mesure de la polarisation du baryon Λ produit dans les collisions p-p à 7 TeV avec le détecteur LHCb

Abstract : The topics discussed and developed in this dissertation aim to propose a new way to test, in a direct manner, the symmetry of time reversal (T): an opportunity is offered by the LHC through the copious production of beauty baryons, especially the Λb whose decay channels in ΛV (1-) would reveal the existence of new odd observables under T. The Emphasis is put on the importance of the Λb initial polarization produced in p-p collisions, and especially those of intermediate resonances coming from Λb. We first present the theoretical framework of this work and secondly the different procedures concerning the direct search of T violation. A phenomenological model considering the decay Λb → Λ J/Ψ has been developed, from which angular distributions are computed. A detailed study of the reconstruction and selection of the channel Λb → Λ J/Ψ is exposed as well as that of the channel Bd0 → J/Ψ Ks0 ; channel used to validate the extraction of the Λb lifetime. On another side and due to the start of the LHC, a preliminary analysis of data recorded by the LHCb has been made. A promising first measure of the hyperon Λ polarization was also performed.
Complete list of metadata

https://theses.hal.science/tel-00597538
Contributor : ABES STAR :  Contact
Submitted on : Monday, February 13, 2012 - 2:33:24 PM
Last modification on : Thursday, December 16, 2021 - 2:10:27 PM
Long-term archiving on: : Monday, May 14, 2012 - 2:36:52 AM

File

2011CLF22106.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00597538, version 2

Citation

Marwa Jahjah-Hussein. Analyse du canal Λb → Λ + J/Ψ et mesure de la polarisation du baryon Λ produit dans les collisions p-p à 7 TeV avec le détecteur LHCb. Autre [cond-mat.other]. Université Blaise Pascal - Clermont-Ferrand II, 2011. Français. ⟨NNT : 2011CLF22106⟩. ⟨tel-00597538v2⟩

Share

Metrics

Record views

277

Files downloads

107