Five-lepton and six-lepton signatures from production of neutral triplet scalars in the Higgs triplet model
Abstract
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±) and doubly charged (H±±) 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 mA0,H0>mH±>mH±±. In this scenario the decays H0→H±W* and A0→H±W*, followed by H±→H±±W*, 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¯→γ*, Z*→H++H--. Assuming the decay H±±→ℓ±ℓ'±, we quantify the magnitude of the five-lepton and six-lepton signals in these channels, which have essentially negligible backgrounds at the LHC.
- Publication:
-
Physical Review D
- Pub Date:
- March 2012
- DOI:
- 10.1103/PhysRevD.85.055026
- arXiv:
- arXiv:1201.5047
- Bibcode:
- 2012PhRvD..85e5026A
- Keywords:
-
- 14.80.Ec;
- 12.60.Fr;
- 14.60.Pq;
- Extensions of electroweak Higgs sector;
- Neutrino mass and mixing;
- High Energy Physics - Phenomenology
- E-Print:
- 19 pages, 13 figures