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Search for Charged Lepton Flavour Violation at LHCb experiment

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dc.contributor.advisor Lesiak, Tadeusz
dc.contributor.advisor Lusiani, Alberto Chrząszcz, Marcin 2017-12-11T11:07:38Z 2017-12-11T11:07:38Z 2015
dc.description.abstract The thesis describes searches for charged lepton flavour violation in the process τ−→ μ−μ+μ−. The study is performed at the LHCb experiment data sample corresponding to an integrated luminosity of 3 fb-1 of proton-proton collisions at a centre-of-mass energy of 7 TeV (8 TeV), collected in 2011 (2012), respectively. No significantly statistical signal of the decay in question has been found and as a result the upper limit was set: B(τ−→μ−μ+μ−) < 4.6 × 10 − 8 at 90% confidence level. The limit was then interpreted in terms of an effective field theory approach including beyond the Standard Model operators with different lepton chirality structures. We found that the limits are within the range: (4.1−6.8)×10−8 at 90% confidence level. The thesis presents also the combination of upper limits for all lepton flavour violating τ lepton decays. For the decay in question, i.e. τ−→μ−μ+μ−, the combination leads to the upper limit of B(τ−→μ−μ+μ−) < 1:2 ×10−8 at 90% confidence level. pl_PL.UTF-8
dc.language.iso pol pl_PL.UTF-8
dc.publisher Institute of Nuclear Physics Polish Academy of Sciences pl_PL.UTF-8
dc.subject LHCb experiment pl_PL.UTF-8
dc.title Search for Charged Lepton Flavour Violation at LHCb experiment pl_PL.UTF-8
dc.type doctoralThesis pl_PL.UTF-8
dc.contributor.reviewer Ciborowski, Jacek
dc.contributor.reviewer Muryn, Bogdan
dc.description.physical 110 pl_PL.UTF-8

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