Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Azimuthal correlation between the $(\vec{p}_l,\vec{p}_{X_b})$ and
  $(\vec{p}_l,\vec{P}_t)$ planes in the semileptonic rest frame decay of a
  polarized top quark: An $O(\alpha_s)$ effect   The azimuthal correlation between the planes formed by the vectors
  $(\vec{p}_\ell,\vec{p}_{X_b})$ and $(\vec{p}_\ell,\vec{P}_t)$ in the
semileptonic rest frame decay of a polarized top quark $t(\uparrow) \to X_b +
l^+ + \nu_\ell$ belongs to a class of polarization observables involving the
top quark which vanish at the Born term level in the standard model. We
determine the next--to--leading order QCD corrections to the afore-mentioned
azimuthal correlation and compare the result to the corresponding contribution
of a non--standard--model right--chiral quark current.

20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess