Department of Physics, University of California at San Diego, La Jolla, 92093, USA.
Phys Rev Lett. 2011 Jul 1;107(1):012002. doi: 10.1103/PhysRevLett.107.012002. Epub 2011 Jun 28.
We show that the forward-backward asymmetry in top quark pair production can be enhanced by fields that transform nontrivially under the flavor group and satisfy minimal flavor violation, while at the same time the constraints from associated effects on the dσ(tt)/dM(tt) distribution, dijet resonance searches, same-sign top-pair production, and other phenomenology are satisfied. We work out two examples in detail: one where a scalar color antisextet field that is also an antisextet of SU(3)(U) enhances the forward-backward asymmetry and one where the enhancement arises from a vector color octet field that is also an octet of SU(3)(U).
我们表明，在满足最小味破坏条件下，那些在味群下具有非平凡变换的场，可以增强顶夸克对产生的前向-后向不对称性，同时也满足关联效应对 dσ(tt)/dM(tt) 分布、双喷注共振搜索、同号顶夸克对产生和其他现象学的限制。我们详细地给出了两个例子：一个例子中，一个标量色反 sextet 场，同时也是 SU(3)(U) 的反 sextet，增强了前向-后向不对称性；另一个例子中，增强来源于一个矢量色 octet 场，同时也是 SU(3)(U) 的 octet。
