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We study a type I seesaw model of neutrino masses within the framework of$A_4$ flavor symmetry. Incorporating the presence of both singlet and tripletflavons under $A_4$ symmetry, we construct the leptonic mass matrices involvedin type I seesaw mechanism. We then construct the light neutrino mass matrixusing the $3\sigma$ values of neutrino oscillation parameters keeping thepresently undetermined parameters namely, the lightest neutrino mass$m_{\text{lightest}}$, one Dirac CP phase $\delta$ and two Majorana phases$\alpha, \beta$ as free parameters. Comparing the mass matrices derived using$A_4$ parameters as well as light neutrino parameters, we then evaluate all the$A_4$ parameters in terms of light neutrino parameters. Assuming some specificvacuum alignments of $A_4$ triplet flavon field, we then numerically evaluateall the free parameters in the light neutrino sector, using which we also findout the remaining $A_4$ parameters. We then use the numerical values of theseparameters to calculate baryon asymmetry through the mechanism of leptogenesis.We not only constrain the $A_4$ vacuum alignments from the requirement ofsuccessful leptogenesis, but also constrain the free parameters in the lightneutrino sector $(m_{\text{lightest}}, \delta, \alpha, \beta)$ to certain rangeof values. These values can be tested in ongoing and future neutrinoexperiments providing a way to discriminate between different possible $A_4$vacuum alignments discussed in this work.

Constraining Type I Seesaw with $A_4$ Flavor Symmetry From Neutrino Data and Leptogenesis