On the structure observed in the in-flight He reaction at J-PARC

関原 隆泰; Oset, E.*; Ramos, A.*

no journal, , 

In this contribution we theoretically investigate what is the origin of the peak structure observed in the E15 experiment at J-PARC. Since the peak exists near the threshold, we expect two scenarios to produce the peak. One is that the is generated but it does not correlate with , and the uncorrelated - system subsequently decays into . The other is that the quasi-bound state is indeed generated and decays into . We calculate the invariant mass spectrum of the reaction with these two scenarios and compare it with the experimental one to interpret the experimental peak structure.