Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 8, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP08(2011)055
Keywords
Beyond Standard Model; Phenomenological Models; Hadronic Colliders
Categories
Funding
- United States National Science Foundation [NSF-PHY-0910467]
- Maryland Center for Fundamental Physics
- STFC [ST/J000434/1, ST/G000581/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G000581/1, ST/J000434/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Physics [910467] Funding Source: National Science Foundation
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We ask what new states may lie at or below the TeV scale, with sizable flavour-dependent couplings to light quarks, putting them within reach of hadron colliders via resonant production, or in association with Standard Model states. In particular, we focus on the compatibility of such states with stringent flavour-changing neutral current and electric-dipole moment constraints. We argue that the broadest and most theoretically plausible flavour structure of the new couplings is that they are hierarchical, as are Standard Model Yukawa couplings, although the hierarchical pattern may well be different. We point out that, without the need for any more elaborate or restrictive structure, new scalars with diquark couplings to standard quarks are particularly immune to existing constraints, and that such scalars may arise within a variety of theoretical paradigms. In particular, there can be substantial couplings to a pair of light quarks or to one light and one heavy quark. For example, the latter possibility may provide a flavour-safe interpretation of the asymmetry in top quark production observed at the Tevatron. We thereby motivate searches for diquark scalars at the Tevatron and LHC, and argue that their discovery represents one of our best chances for new insight into the Flavour Puzzle of the Standard Model.
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