Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Longitudinal top polarization as a probe of a possible origin of
  forward-backward asymmetry of the top quark at the Tevatron   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 $A_{\rm FB}$.

21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat