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Possible existence of deeply bound kaonic nuclear systems was proposedAkaishi and Yamazaki (2002} more than a decade ago, based on an ansatz that theLambda* = Lambda(1405) mass is 1405 MeV/c2, where the Lambda* is a Kbar-Nquasi-bound state decaying to Sigma-pi. Recently, a large number of data onphoto-production of Lambda(1405) in the gamma p to K+ pi{0+-} Sigma{0-+}reaction were provided by the CLAS collaboration Moriya et al.(2013}, anddouble-pole structure of the Lambda* has been intensively discussed by chiraldynamics analyses {Roca (2013),Mai 2015}, whereas we show that a Lambda* massof 1405 MeV/c2 is deduced from the same CLAS data.

Clear indication of a strong I=0 Kbar-N attraction in the Lambda (1405) region from the CLAS photo-production data