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Phys. Rev. D 78, 015018 (2008) [29 pages]

Neutrino masses and the CERN LHC: Testing the type II seesaw mechanism

Pavel Fileviez Pérez,1 Tao Han,1,2 Guiyu Huang,1 Tong Li,1,3 and Kai Wang1
1Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA
2KITP, University of California, Santa Barbara, California 93107, USA
3Department of Physics, Nankai University, Tianjin 300071, People's Republic of China

Received 28 May 2008; published 25 July 2008

We demonstrate how to systematically test a well-motivated mechanism for neutrino mass generation (type II seesaw) at the LHC, in which a Higgs triplet is introduced. In the optimistic scenarios with a small Higgs triplet vacuum expectation value vDelta<10-4 GeV, one can look for clean signals of lepton-number violation in the decays of doubly charged (H±±) and singly charged (H±) Higgs bosons to distinguish the normal hierarchy (NH), the inverted hierarchy (IH), and the quasidegenerate (QD) spectrum for the light neutrino masses. The observation of either H+-->tau+[overline nu ] or H+-->e+[overline nu ] will be particularly robust for the spectrum test since they are independent of the unknown Majorana phases. The H++ decays moderately depend on a Majorana phase Phi2 in the NH, but sensitively depend on Phi1 in the IH. In a less favorable scenario vDelta>2×10-4 GeV, when the leptonic channels are suppressed, one needs to observe the decays H+-->W+H1 and H+-->t[overline b] to confirm the triplet-doublet mixing which in turn implies the existence of the same gauge-invariant interaction between the lepton doublet and the Higgs triplet responsible for the neutrino mass generation. In the most optimistic situation, vDelta~10-4 GeV, both channels of the lepton pairs and gauge boson pairs may be available simultaneously. The determination of their relative branching fractions would give a measurement for the value of vDelta.

©2008 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevD.78.015018
DOI: 10.1103/PhysRevD.78.015018
PACS: 14.80.Cp; 14.60.Pq
  • 14.80.Cp
    Non-standard-model Higgs bosons
  • 14.60.Pq
    Neutrino mass and mixing
  • YEAR: 2008

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