Doubly charged scalar decays in a type II seesaw scenario with two Higgs triplets
- Author(s)
- Avinanda Chaudhuri, Walter Grimus, Biswarup Mukhopadhyaya
- Abstract
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 H++1→H+2W+ 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.
- Organisation(s)
- Particle Physics
- External organisation(s)
- Harish-Chandra Research Institute, Department of Atomic Energy, Government of India
- Journal
- Journal of High Energy Physics
- Volume
- 2014
- No. of pages
- 24
- ISSN
- 1029-8479
- DOI
- https://doi.org/10.1007/JHEP02(2014)060
- Publication date
- 02-2014
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103034 Particle physics
- Keywords
- ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/f5b057c1-9ec9-4edb-9dc0-6e089348a30d