arXiv 1105.31612011-05hep-ph

强子对撞机上的美味产生

Flavourful Production at Hadron Colliders

Gian Francesco Giudice, Ben Gripaios, Raman Sundrum

备注：: 18 pp., 8 figures, references added
发表信息：: JHEP 1108:055,2011
DOI：: 10.1007/JHEP08(2011)055

摘要：

我们问什么新的状态可能位于或低于TeV尺度，与轻夸克具有相当大的味道依赖耦合，通过共振产生使它们在强子对撞机的范围内，或与标准模型状态相关联。特别是，我们专注于这种状态的兼容性与严格的口味变化的中性电流和电偶极矩的限制。我们认为，最广泛的和理论上最合理的味道结构的新的耦合是，他们是分层的，是标准模型汤川耦合，虽然层次模式可能是不同的。我们指出，不需要任何更复杂或限制性的结构，新的标量与标准夸克的“双夸克”耦合是特别免疫现有的限制，这种标量可能会出现在各种理论范式。特别是，一对轻夸克或一个轻夸克和一个重夸克之间可能存在实质性的耦合。例如，后一种可能性可能提供了一个味道安全的解释在Tevatron观察到的顶夸克生产的不对称性。因此，我们激励搜索双夸克标量在Tevatron和大型强子对撞机，并认为他们的发现代表了我们的一个最好的机会，新的见解口味之谜的标准模型。

英文摘要：

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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