Can the Nambu-Goldstone Boson Live on the Light-Front?

Yoonbai Kim, Sho Tsujimaru, Koichi Yamawaki

We show that the Nambu-Goldstone(NG) boson restricted on the light-front(LF) can only exist if we regularize the theory by introducing the explicit breaking NG-boson mass $m_{\pi }$. Th…