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We consider massive photon decay reactions via intermediate states ofelectron-electron-holes and proton-proton-holes into neutrino-antineutrinopairs in the course of neutron star cooling. These reactions may becomeoperative in hot neutron stars in the region of proton pairing where the photondue to the Higgs-Meissner effect acquires an effective mass $m_{\gamma}$ thatis small compared to the corresponding plasma frequency. The contribution ofthese reactions to neutrino emissivity is calculated; it varies with thetemperature and the photon mass as $T^{3/2}m_{\gamma}^{7/2} e^{-m_{\gamma}/T}$for $T < m_{\gamma}$. Estimates show that these processes appear as extraefficient cooling channels of neutron stars at temperatures $T \simeq(10^9-10^{10})$ K.Comment: accepted to publication in Zh. Eksp. Teor. Fiz. (JETP

Contribution of the massive photon decay channel to neutrino cooling of neutron stars