title: New physics in resonant production of Higgs boson pairs.
abstract: We advocate a search for an extended scalar sector at the LHC via hh production, where h is the 125 GeV Higgs boson. A resonance feature in the hh invariant mass is a smoking gun of an s-channel heavy Higgs resonance, H. With one h decaying to two photons and the other decaying to b quarks, the resonant signal may be discoverable above the hh continuum background for M(H)<1  TeV. The product of the scalar and top Yukawa couplings can be measured to better than 10%-20% accuracy, and its sign can be inferred from the hh line shape via interference effects.
authors.affiliation: Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA.
authors.forename: Vernon
authors.initials: V
authors.lastname: Barger
authors.affiliation: Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA.
authors.forename: Lisa L
authors.initials: LL
authors.lastname: Everett
authors.affiliation: Department of Physics, University of Texas at Arlington, Arlington, Texas 76019, USA.
authors.forename: C B
authors.initials: CB
authors.lastname: Jackson
authors.affiliation: Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA.
authors.forename: Andrea D
authors.initials: AD
authors.lastname: Peterson
authors.affiliation: Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA.
authors.forename: Gabe
authors.initials: G
authors.lastname: Shaughnessy