Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: CP violation and matter effect for a variable earth density in very long
  baseline experiments   The perturbative treatment of subdominant oscillation and the matter effect
in neutrino beams/superbeams, propagating over long baselines and being used to
look for CP violation, is studied here for a general matter density function
varying with distance. New lowest order analytic expressions are given for
different flavour transition and survival probabilities in a general neutrino
mixing basis and a variable earth matter density profile. It is demonstrated
that the matter effect in the muon neutrino (antineutrino) flavour survival
probability vanishes to this order, provided the depletion, observed for
atmospheric muon neutrinos and antineutrinos at super-Kamiokande, is strictly
maximal. This result is independent of the earth density profile and the
distance L between the source and the detector. In the general variable density
case we show that one cannot separate the matter induced asymmetry from a
genuine CP effect by keeping two detectors at distances $L_1$ and $L_2$ from
the source while maintaining a fixed ratio $L_1/E_1 = L_2/E_2$. This needs to
be done numerically and we estimate the asymmetry generated by the earth matter
effect with particular density profiles and some chosen parameters for very
long baseline neutrino oscillation experiments.

28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org