We discuss exotic Higgs decays in an effective field theory where the Standard Model is extended by dimension-6 operators. We review and update the status of two-body lepton- and quark-flavor-violating decays involving the Higgs boson. We also comment on the possibility of observing three-body flavor-violating Higgs decays in this context.
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http://dx.doi.org/10.1140/epjc/s10052-016-4362-8 | DOI Listing |
Eur Phys J C Part Fields
November 2024
School of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ UK.
While searching at the Large Hadron Collider (LHC) for the production and decay of the CP-odd scalar ( ) in the 2-Higgs-Doublet Model (2HDM) with Natural Flavour Conservation (NFC) via the channels (through one-loop triangle diagrams) and (with GeV or GeV, with off-shell), respectively, a factorisation of the two processes is normally performed, with the state being on-shell. While this approach is gauge-invariant, it is not capturing the presence of either of the following two channels: (through one-loop triangle diagrams) or (through one-loop box diagrams). As the resolution of the mass cannot be infinitely precise, we affirm that all such contributions should be computed simultaneously, whichever the ( ) decay(splitting) products, thereby including all possible interferences amongst themselves.
View Article and Find Full Text PDFPhys Rev Lett
October 2024
CERN, Geneva, Switzerland.
Entropy (Basel)
October 2024
INFN, Laboratori Nazionali di Frascati, Via E. Fermi 54, 00044 Frascati, Italy.
I review possible signals at hadron colliders of bileptons, namely doubly charged vectors or scalars with lepton number L=±2, as predicted by a 331 model, based on a SU(3)c×SU(3)L×U(1)X symmetry. In particular, I account for a version of the 331 model wherein the embedding of the hypercharge is obtained with the addition of three exotic quarks and vector bileptons. Furthermore, a sextet of SU(3)L, necessary to provide masses to leptons, yields an extra scalar sector, including a doubly charged Higgs, i.
View Article and Find Full Text PDFPhys Rev Lett
October 2024
CERN, Geneva, Switzerland.
Eur Phys J C Part Fields
August 2024
DAMTP, University of Cambridge, Wilberforce Road, Cambridge, CB3 0WA UK.
We present the open-source SIMUnet code, designed to fit Standard Model Effective Field Theory (SMEFT) Wilson coefficient alongside Parton Distribution Functions (PDFs) of the proton. SIMUnet can perform SMEFT global fits, as well as simultaneous fits of the PDFs and of an arbitrarily large number of SMEFT degrees of freedom, by including both PDF-dependent and PDF-independent observables. SIMUnet can also be used to determine whether the effects of any New Physics models can be fitted away in a global fit of PDFs.
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