Comment on the narrow structure reported by Amaryan et al
  The CLAS Collaboration provides a comment on the physics interpretation of the results presented in a paper published by M. Amaryan et al. regarding the possible observation of a narrow structure in the mass spectrum of a photoproduction experiment. 
M. Anghinolfi, J. Ball, N.A. Baltzell, M. Battaglieri, I. Bedlinskiy,   M. Bellis, A.S. Biselli, C. Bookwalter, S. Boiarinov...
hep-ex nucl-ex