Search for avor-changing neutral current top quark decays t-›Hq, with H-›bb, in pp collisions at √s = 8 TeV with the ATLAS detector
Tsiskaridze, Shota
Juste Rozas, Aurelio, dir.
Grinstein, Sebastian, dir.
Casado Lechuga, María del Pilar, dir. (Universitat Autònoma de Barcelona. Departament de Física)
Universitat Autònoma de Barcelona. Departament de Física
Institut de Física d'Altes Energies

Publicació:	[Barcelona] : Universitat Autònoma de Barcelona, 2016
Descripció:	1 recurs electrònic (232 p.)
Resum:	The results presented in this dissertation fill a gap in the program of searches for t → Hq decays during Run 1 of the LHC by considering the dominant decay mode H → b¯b, which has BR(H → b¯b) ' 58%. The search is focused on the tt¯ → W bHq (q = u, c) process, with W → 'ν (' = e, µ, τ ) and H → b¯b, resulting in a leptonplus-jets final state with high b-jet multiplicity, which can be effectively exploited to suppress the overwhelming tt¯ background. The lepton-plus-jets final state also allows the kinematic reconstruction of the final state and in particular the dijet invariant mass spectrum from the H → b¯b decay, providing additional handles that would help in detecting tt¯ → W bHq events. Most of this dissertation is devoted to the discussion of this particular search, for which background estimation techniques, systematic uncertainties and statistical treatment closely follow those used in ATLAS searches using the same final-state signature [8, 9]. The results obtained have been published by the ATLAS collaboration in Ref. [10]. A combination of the three ATLAS searches for tt¯ → W bHq, probing the H → b¯b, H → W W ∗ , τ τ , and H → γγ decay modes, is performed and bounds are set on BR(t → Hc) and BR(t → Hu), as well as on the corresponding non-flavor-diagonal Yukawa couplings.
Nota:	Tesi doctoral - Institut de Física d'Altes Energies, 2016. Tesi doctoral - Universitat Autònoma de Barcelona. Departament de Física, 2016
Nota:	Bibliografia
Drets:	L'accés als continguts d'aquesta tesi queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons
Llengua:	Anglès
Document:	Tesi doctoral ; Versió publicada
Matèria:	Quarks ; Higgs, Bosons de
ISBN:	9788449064845

Adreça alternativa: https://hdl.handle.net/10803/387229

233 p, 10.6 MB

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