Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new method of parametrisation of neutrino mass matrix through breaking
  of $\mu-\tau $ symmetry: Normal hierarchy   In the first part of the present work the $\mu-\tau $ symmetry of the
neutrino mass matrix is perturbed at its minimal level in order to produce
deviation from Tri-bimaximal mixing (TBM), which includes nonzero value of
reactor angle $\theta_{13}$ and maximal condition of $\tan^{2}\theta_{23}=1$.
The parametrisation of neutrino mass matrix which describes Normal hierarchy
(NH), has been addressed with minimum number of independent parameters, out of
which two parameters $\eta$ and $\alpha$ take care of $\theta_{12}$ and
$\theta_{13}$ respectively without any interference with mass eigenvalues. In
the second part the deviation from maximal condition $\tan^{2}\theta_{23}=1$,
along with the nonzero value of $\theta_{13}$, has been implemented with the
introduction of a perturbing matrix which breaks the $\mu-\tau $ symmetric mass
matrix. The model is found to be flexible enough to adjust itself with the
changing precise experimental results. The method is also applicable for
inverted hierarchy and quasi-degenerate cases.

19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics