Theory seminar (11am): Johannes Michel: Detecting Traces of Light-Quark Yukawa Couplings to the Higgs Boson in Fragmentation Products
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Europe/Amsterdam
Positron room (Nikhef)
Positron room
Nikhef
Description
Empirically confirming that the masses of first and second-generation quarks are indeed rooted in their Yukawa couplings to the Higgs field, as theorized in the Standard Model, remains a pressing unsolved problem. In this talk I describe how Yukawa interactions of light quarks with the Higgs boson are imprinted as unique azimuthal modulations in the density of fragmentation hadrons relative to the Higgs pT. Exploiting this, I introduce Yukawa Fragmentation Asymmetries (YFAs), interference observables that are linearly proportional to real (Standard Model) or CP-odd Yukawa couplings, respectively. The chiral suppression is lifted nonperturbatively by chiral-odd multi-hadron fragmentation functions. As a case study, I consider VH production with a tagged target fragmentation hadron at the HL-LHC. I also sketch additional theoretical properties of YFAs that make them particularly robust probes of the Higgs Yukawa couplings.
