Lepton Number Violation and Lepton Flavour Violation at LHCb

3rd Symposium on Prospects in the Physics of Discrete Symmetries

Adeva, B.^1

Departamento de Fisica de Particulas, Facultad de Fisica, Campus sur, E-15782 Santiago de Compostela, Spain^1

关键词: Branching fractions;    Branching ratio;    Confidence levels;    Lepton flavour violations;    Lepton number violations;    Majorana neutrino;    Majorana neutrino mass;    Proton proton collisions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/447/1/012062/pdf
DOI  :  10.1088/1742-6596/447/1/012062

来源: IOP

【 摘 要 】

Searches for heavy Majorana neutrinos in B-decays with final states containing hadrons plus a μ-μ-pair are performed using 0.41 fb-1of data collected with the LHCb detector in proton-proton collisions at a center-of-mass energy of 7 TeV. No signals are found and upper limits are set on Majorana neutrino production and B-decay branching fractions as a function of the Majorana neutrino mass. A search is also made for the lepton flavour violating decay τ → μ+μ-μ-using 1.0 fb-1of data collected by LHCb in 2011. The observed number of events is consistent with the background expectation, and an upper limit on the branching ratio is set. Using a similar procedure, the lepton flavour violating and baryon number violating decays τ-→ μ+μ-and τ-→ pμ-μ-are searched for, and upper limits provided at 95% confidence level.