Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the polarisation amplitudes in B0 -> J/psi K*(892)0
  decays   An analysis of the decay B0 -> J/psi K*(892)0 is presented using data,
corresponding to an integrated luminosity of 1.0fb^-1, collected in pp
collisions at a centre-of-mass energy of 7TeV with the LHCb detector. The
polarisation amplitudes and the corresponding phases are measured to be
  |A_{\parallel}|^2 = 0.227 +- 0.004 (stat.) +- 0.011 (syst.),
  |A_{\perp}|^2 = 0.201 +- 0.004 (stat.) +- 0.008 (syst.),
  \delta_{\parallel} [rad] = -2.94 +- 0.02 (stat.) +- 0.03 (syst.),
  \delta_{\perp} [rad] = 2.94 +- 0.02 (stat.) +- 0.02 (syst.).
  Comparing B0 -> J/psi K*(892)0 and \bar{B}0 -> J/psi \bar{K}*(892)0 decays,
no evidence for direct CP violation is found.

24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph