Five-lepton and six-lepton signatures from production of neutral triplet scalars in the Higgs Triplet Model

Akeroyd, A.G., Moretti, S. and Sugiyama, Hiroaki (2012) Five-lepton and six-lepton signatures from production of neutral triplet scalars in the Higgs Triplet Model. Physical Review D, D85 (5), 055026-[13 pages]. (doi:10.1103/PhysRevD.85.055026).

Abstract

The neutral triplet scalars (H^0, A^0) in the Higgs Triplet Model (HTM) are difficult to detect at the LHC for the case of mass degeneracy with the singly charged (H^+) and doubly charged (H^++) scalars. A non-zero 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_{A^0,H^0} > m_{H^+} > m_{H^++}. In this scenario the decays H^0-> H^+ W^* and A^0-> 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 H^0 and A^0 with a signature which is different from that of the conventional production process for doubly charged scalars, q qbar -> \gamma^*, Z^* -> H^{++}H^{--}. Assuming the decay H^{++} to 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.

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Contributors

Author: A.G. Akeroyd

Author: S. Moretti

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