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Tagging rare top, Z and Higgs decays at colliders

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If you have a question about this talk, please contact Luca Mantani .

Recent advances in jet tagging allow for high-energy colliders such as the LHC and prospective FCC to place phenomenologically relevant bounds on rare top, Z and Higgs decays involving flavored jets. In particular, I will present a novel strategy for measuring branching fractions of top quark decays, targeting specifically t→jW, where j is a light quark jet. Including additional complementary observables into existing analyses paves the way to access directly the standard model value of |Vtd|2 + |Vts|2 at the HL-LHC. A similar strategy can be exploited at the FCC -ee to probe flavor violating Z and Higgs boson decays to quarks. In particular, I will discuss the prospects for reaching the SM value of Br(Z→bs), as well as for surpassing indirect neutral meson mixing constraints on quark flavour changing Higgs boson couplings.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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