Observation of a new baryon state in the ${\Lambda }_b^0{\pi }^{+}{\pi }^{-}$ mass spectrum

LHCb collaboration, R. Aaij, C. Abellán Beteta +905

A new baryon state is observed in the ${\Lambda }_b^0{\pi }^{+}{\pi }^{-}$ mass spectrum with high significance using a data sample of $pp$ collisions, collected with the LHCb detector at centre-of-mass…