Senapati, S
(2015)
Neutrinoless double Betadecay in Seesaw Mechanism.
Masters thesis, Indian Institute of Technology Hyderabad.
Abstract
In the standard model the total lepton number is conserved.Thus the neutrinoless double beta decay
,in which lepton number violated by 2 units is a probe of Physics beyond the Standard Model.Here we first discuss about the Standard Model and then we discuss about the Seesaw mechanism to generate the small Majorana mass of the neutrinos , in which the lepton number is violated by 2 units. After a brief summary we discuss then about the neutrino masses and mixing i.e.CabbiboKobayashi
Maskawa ( CKM ) matrix and PMNS matrix, normal and inverted hierarchy , the absolute scale of neutrino masses ,effective Majorana mass.After brief discussion we plot the graphs for normal and inverted hierarchy and find out the range of the normal and inverted spectrum and we discuss a
little bit about the Majorana phases and we plot the graphs between two Majorana phases.In the next portion we discuss about the theory of neutrinoless double beta decay.In this case at first we calculate the matrix element, then the decay rate of the neutrinoless double beta decay and finally
we calculate the half lifetime of this process. Then we plot the half lifetime vs lightest mass graphs for normal and inverted hierarchy and make some conclusion.
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