Pion-Nucleon Sigma Term by Deeply Bound Pionic Atoms

N. Ikenoa, T. Nishib, K. Itahashib, N. Nose-Togawac, A. Tania, S. Hirenzakid aDepartment of Agricultural, Life and Environmental Sciences, Tottori University, Tottori 680-8551, Japan bNishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan cResearch Center for Nuclear Physics (RCNP), Osaka University, Ibaraki 567-0047, Japan dDepartment of Physics, Nara Women's University, Nara 630-8506, Japan

Full Text PDF

We report the results of research on the sensitivity of the observables of the deeply bound pionic atom to the pion-nucleon sigma term σπN. We calculate the uncertainties of determining the value of sigmaπN with the accurate data of the deeply bound pionic atoms expected to be obtained at the RI Beam Factory (RIBF), RIKEN. We find that the energy gap of the 1s and 2p pionic states, (Bπ(1s)-Bπ(2p)), and the width of the 1s state for the lighter Sn isotope are expected to be important observables to precisely determine the σπN value by taking into account the expected errors of the experiments.

DOI:10.12693/APhysPolA.142.342 topics: deeply bound pionic atoms, pion-nucleon sigma term