Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Further study on the textures of neutrino mass matrix for maximal
  atmospherical mixing angle and Dirac CP phase   In this paper, we derive in a novel approach the possible textures of
neutrino mass matrix that can lead to maximal atmospherical mixing angle
($\theta^{}_{23} = \pi/4$) and Dirac CP phase ($\delta = - \pi/2$) in two
phenomenologically appealing scenarios: (1) one neutrino mass matrix element
being vanishing (2) one neutrino mass being vanishing. For the obtained
textures, some neutrino mass sum rules which relate the neutrino masses and
mixing parameters will emerge. With the help of these sum rules, the unknown
absolute neutrino mass scale and Majorana CP phases can be determined. Some
discussions about the possible textures of neutrino mass matrix that can lead
to $\theta^{}_{23} = \pi/4$, $\delta = - \pi/2$ and maximal Majorana CP phases
($\rho, \sigma = \pi/4$ or $3\pi/4$) as well as the model realization and
breakings of the obtained textures are also given.

36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga