2012/01/24 by A. G. Akeroyd, Stefano Moretti, S. Moretti +1 · 43 citations
Physics and Astronomy · #Boson #Dark Matter and Cosmic Phenomena #Electron #Elementary particle #Higgs boson #Lepton #Muon #Neutrino Physics Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Scalar (mathematics) #Yukawa potential #hep-ph
paper · pdf · doi:10.1103/physrevd.85.055026
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 85(5) (American Physical Society) · 19 pages, 13 figures
arxiv created 2012/01/24 · openalex publication_date 2012/03/29 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The neutral triplet scalars (H0, A0) in the Higgs triplet model are difficult to detect at the LHC for the case of mass degeneracy with the singly charged (H^\ifmmode±\else\textpm\fi) and doubly charged (H^\ifmmode±\else\textpm\fi\ifmmode±\else\textpm\fi) scalars. A nonzero value of a specific quartic coupling in the scalar potential removes this degeneracy, and positive values of this coupling would give rise to the mass hierarchy m_A0,H0>m_H^\ifmmode±\else\textpm\fi>m_H^\ifmmode±\else\textpm\fi\ifmmode±\else\textpm\fi. In this scenario the decays H0\ensuremath→H^\ifmmode±\else\textpm\fiW* and A0\ensuremath→H^\ifmmode±\else\textpm\fiW*, followed by H^\ifmmode±\else\textpm\fi\ensuremath→H^\ifmmode±\else\textpm\fi\ifmmode±\else\textpm\fiW*, can proceed with large branching ratios, even for small mass splittings among the triplet scalars. Such a cascade process would lead to production of H++H-- accompanied by several virtual W bosons, and would provide a way of observing H0 and A0 with a signature which is different from that of the conventional production process for doubly charged scalars, qq\ensuremath→\ensuremathγ*, Z*\ensuremath→H++H--. Assuming the decay H^\ifmmode±\else\textpm\fi\ifmmode±\else\textpm\fi\ensuremath→\ensuremathℓ^\ifmmode±\else\textpm\fi\ensuremathℓ^\ensuremath'\ifmmode±\else\textpm\fi, we quantify the magnitude of the five-lepton and six-lepton signals in these channels, which have essentially negligible backgrounds at the LHC.