Probing the Higgs self-coupling at hadron colliders using rare decays

Abstract

We investigate Higgs boson pair production at hadron colliders for Higgs boson masses m_H\leq 140 GeV and rare decay of one of the two Higgs bosons. While in the Standard Model the number of events is quite low at the LHC, a first, albeit not very precise, measurement of the Higgs self-coupling is possible in the gg -> HH -> b\bar{b}γγchannel. A luminosity-upgraded LHC could improve this measurement considerably. A 200 TeV VLHC could make a measurement of the Higgs self-coupling competitive with a next-generation linear collider. In the MSSM we find a significant region with observable Higgs pair production in the small \tanβregime, where resonant production of two light Higgs bosons might be the only hint at the LHC of an MSSM Higgs sector.

Revtex, 23 pages, 4 tables, 7 figures

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