2013/05/31 by Avinanda Chaudhuri, Walter Grimus, Biswarup Mukhopadhyaya · 18 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Branching fraction #Geometry #Higgs boson #Lepton #Neutrino #Neutrino Physics Research #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Scalar (mathematics) #Scalar boson #Seesaw mechanism #Seesaw molecular geometry #Yukawa potential #hep-ph
paper · pdf · doi:10.1007/jhep02(2014)060
published in Journal of High Energy Physics 2014(2) (Springer Nature) · 22 pages, 1 figure
openalex publication_date 2014/02/01 · arxiv created 2014/03/10 · arxiv updated 2015/06/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The type II seesaw mechanism for neutrino mass generation usually makes use of one complex scalar triplet. The collider signature of the doubly-charged scalar, the most striking feature of this scenario, consists mostly in decays into same-sign dileptons or same-sign W boson pairs. However, certain scenarios of neutrino mass generation, such as those imposing texture zeros by a symmetry mechanism, require at least two triplets in order to be consistent with the type II seesaw mechanism. We develop a model with two such complex triplets and show that, in such a case, mixing between the triplets can cause the heavier doubly-charged scalar mass eigenstate to decay into a singly-charged scalar and a W boson of the same sign. Considering a large number of benchmark points with different orders of magnitude of the ΔL = 2 Yukawa couplings, chosen in agreement with the observed neutrino mass and mixing pattern, we demonstrate that H1++→ H2+W+ can have more than 99 % branching fraction in the cases where the vacuum expectation values of the triplets are small. It is also shown that the above decay allows one to differentiate a two-triplet case at the LHC, through the ratios of events in various multi-lepton channels.