Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Model independent analysis of the forward-backward asymmetry of top
  quark production at the Tevatron   Motivated by a possible anomaly in the forward-backward (FB) asymmetry of top
quark (A_{\rm FB}) observed at the Tevatron, we perform a model independent
analysis on q \bar{q} \to t \bar{t} using an effective lagrangian with dim-6
four-quark operators. We derive necessary conditions on new physics structures
and the couplings that are consistent with the t\bar{t} production cross
section and A_{\rm FB} measured at the Tevatron, and discuss possible new
physics scenarios that could generate such dim-6 operators.

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The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn