Pair production of doubly charged scalars: Neutrino mass constraints and signals at the CERN LHC

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Tao Han,^1,4 Biswarup Mukhopadhyaya,² Zongguo Si,³ and Kai Wang¹
¹Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA
²Harish-Chandra Research Institute, Allahabad 211019, India
³Department of Physics, Shandong University, Jinan, Shandong 250100, People's Republic of China
⁴Center for High Energy Physics, Tsinghua University, Beijing 100084, People's Republic of China

Received 14 June 2007; published 17 October 2007

Westudy the pair production of doubly charged Higgs bosons atthe CERN Large Hadron Collider (LHC), assuming the doubly chargedHiggs to be part of an SU(2)_L triplet which generatesMajorana masses for left-handed neutrinos. Such pair production has theadvantage that it is not constrained by the triplet vacuumexpectation value, which tends to make the single production raterather small. We point out that, in addition to theDrell-Yan production mechanism, two-photon processes also contribute to H⁺⁺H^-- productionat a level comparable to the QCD corrections to theDrell-Yan channel. Decays of the doubly charged Higgs into boththe [script-l]⁺[script-l]⁺ and W⁺W⁺ modes are studied in detail tooptimize the signal observation over the backgrounds. Doubly charged scalarsshould be observable at the LHC with 300 fb^-1 integrated luminosityin the [script-l]^±[script-l]^± channel up to the mass range of1 TeV even with a branching fraction of about 60%, andin the W^±W^± channel up to a mass of 700 GeV.Such a doubly charged Higgs, if it is a memberof a triplet that generates neutrino masses, cannot be long-livedon the scale of collider detectors although it might leadto a displaced secondary vertex during its decay if itis lighter than about 250 GeV.

URL:	http://link.aps.org/doi/10.1103/PhysRevD.76.075013
DOI:	10.1103/PhysRevD.76.075013
PACS:	14.80.Cp 14.80.Cp Non-standard-model Higgs bosons YEAR: 2007

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