Wednesday, May 22, 2013

1305.0251 (Zhong-Zhi Xianyu et al.)

Gravitational Interaction of Higgs Boson and Weak Boson Scattering    [PDF]

Zhong-Zhi Xianyu, Jing Ren, Hong-Jian He
With the LHC discovery of a 125GeV Higgs-like particle, we study gravitational interaction of Higgs boson via the unique dimension-4 operator involving Higgs doublet and scalar curvature, \xi H^\dag H R, with nonminimal coupling \xi. This Higgs portal term can be transformed away in Einstein frame and induces gauge-invariant effective interactions in the Higgs sector. We study the weak boson scattering in Einstein frame, and explicitly demonstrate the longitudinal-Goldstone boson equivalence theorem in the presence of \xi coupling. With these, we derive unitarity bound on the Higgs gravitational coupling \xi in Einstein frame, which is stronger than that inferred from the LHC Higgs measurements. We further analyze \xi-dependent weak boson scattering cross sections at TeV scale, and study the LHC probe of \xi coupling via weak boson scattering experiments.
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