Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-11-27
Phys.Lett.B701:248-254,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 5 figures, to appear in PLB
Scientific paper
10.1016/j.physletb.2011.05.058
If the forward-backward (FB) asymmetry of top quark ($A_{\rm FB}$) observed at the Tevatron deviates from the SM prediction, there must be $P$-violating interactions in $q\bar{q} \rightarrow t\bar{t}$. This new interaction will necessarily affect the top spin polarization. In this letter, we perform a model independent analysis on the longitudinal (anti)top polarization ($P_L$ and $\bar{P}_L$) using an effective lagrangian with dim-6 four-quark operators relevant for $q \bar{q} \rightarrow t \bar{t}$, and show that the $P$-odd observable corresponding to the polarization difference $(P_L - \bar{P}_L)$ gives important informations on the chiral structures of new physics that might be relevant to the $A_{\rm FB}$.
Jung Dong-Won
Ko Pyungwon
Lee Jae Sik
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