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Paper detail

Constraining models with a large scalar multiplet

Models in which the Higgs sector is extended by a single electroweak scalar multiplet X can possess an accidental global U(1) symmetry at the renormalizable level if X has isospin T greater or equal to 2. We show that all such U(1)-symmetric models are excluded by the interplay of the cosmological relic density of the lightest (neutral) component of X and its direct detection cross section via Z exchange. The sole exception is the T=2 multiplet, whose lightest member decays on a few-day to few-year timescale via a Planck-suppressed dimension-5 operator.

preprint2013arXivOpen access
Kevin EarlKaty HartlingHeather E. LoganTerry Pilkington
hep-ph
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Kevin EarlKaty HartlingHeather E. LoganTerry Pilkington

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