We propose a search for Higgs decays with as many as 8 leptons in the final state. This signal can arise in a simple model with a hidden vector (A_{d}) that gets mass via a hidden scalar (h_{d}) vacuum expectation value. The 125 GeV Higgs boson can then decay H→h_{d}h_{d}→4A_{d}→8f, where f are standard model fermions. We recast current searches and show that a branching ratio (BR) of H→h_{d}h_{d} as large as 10% is allowed. We also describe a dedicated search that could place bounds on BR(H→h_{d}h_{d}) as low as 10^{-5} using only 36 fb^{-1} of data, with significant improvements coming from greater integrated luminosity.
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http://dx.doi.org/10.1103/PhysRevLett.121.221803 | DOI Listing |
Rep Prog Phys
January 2025
European Organization for Nuclear Research, HCP, CH-1211 GENEVE 23, Geneva, 1211 Geneva 23, SWITZERLAND.
A search for light long-lived particles decaying to displaced jets is presented, using a data sample of proton-proton collisions at a center-of-mass energy of 13.6 TeV, corresponding to an integrated luminosity of 34.7 fb$^{-1}$, collected with the CMS detector at the CERN LHC in 2022.
View Article and Find Full Text PDFEur 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.
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