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We present the study of radiative tau decay ($\tau^- \rightarrow \pi^-\nu_\tau \gamma$), computing the structure dependent contribution using LightCone Sum Rules. This decay includes the same form factors as the radiative piondecay with the crucial difference that the momentum transfer squared, $t$,between the pion-photon system is positive, which makes these form factorstimelike and also as $t$ can now take values upto $m_\tau^2$ , it can producereal hadronic resonances. The analytical form for these form factors has beencalculated using light cone sum rules method and the invariant mass-spectrum inthe $\pi-\gamma$ system and the decay width are presented. The structuredependent parameter, $\gamma$, the ratio of the axial to vector form factor isfound to be in good agreement with the experimental determination.

Phenomenology of $\tau^- \rightarrow \pi^- \nu_{\tau} \gamma$ using LCSR