Forward Tevatron top quarks and backward LHC top quarks with associates

作者：Drobnak Jure^*; Kagan Alexander L; Kamenik Jernej F; Perez Gilad; Zupan Jure

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2012, 86(9): 094040.

DOI：10.1103/PhysRevD.86.094040

The anomalous forward-backward asymmetry (A(FB)) in t (t) over bar production at the Tevatron is in apparent contradiction with the t (t) over bar charge asymmetry (AC) measurements at the LHC, which agree well with the standard model predictions. We argue that associated production of a state with [u (t) over bar] flavor quantum numbers can lead to a sizable negative contribution to A(C). Exchange of such a resonance in the t channel would lead to positive contributions to A(FB) and A(C), as has been extensively discussed in the literature. Given the additional negative AC contribution, both the Tevatron and LHC data can be naturally accommodated within this framework. A simple realization of this setup is the well known example of a Z%26apos; with flavor off-diagonal up-top couplings. We provide a detailed study of this model, demonstrating that it indeed reproduces the t (t) over bar asymmetry data, and is compatible with other constraints, e.g., t + jet resonance searches, t (t) over bar inclusive jet multiplicities, and atomic parity violation.

• 出版日期2012-11-27