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Phys. Rev. D 78, 015018 (2008) [29 pages]Neutrino masses and the CERN LHC: Testing the type II seesaw mechanism
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 REFERENCES (34)
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