Search for Pentaquark Θ in Hadronic Reaction at J-PARC.

Authors :: Naruki, M.
Adachi, S.
Agnello, M.
Ajimura, S.
Aoki, K.
Bang, H.
Bassalleck, B.
Botta, E.
Bufalino, S.
Ekawa, H.
Evtoukhovitch, P.
Feliciello, A.
Fujioka, H.
Hayakawa, S.
Hiruma, F.
Honda, R.
Hosomi, K.
Ichikawa, Y.
Ieiri, M.
Igarashi, Y.
Source :: Few-Body Systems; Aug2013, Vol. 54 Issue 7-10, p955-960, 6p
Publication Year :: 2013
Abstract: The first experiment at the J-PARC hadron facility, the J-PARC E19 experiment, aims at searching for the Θ pentaquark in the hadronic reaction π p → K X using the missing-mass technique. Based on a superconducting magnet excited at 2.5 T, the spectrometer achieved the high mass resolution of 1.4 MeV/c for the Θ production process. The first data taking was performed in the autumn of 2010. No significant structure was observed in the missing-mass spectrum. The upper limit obtained for the differential cross section is 0.26 μb/sr in the laboratory frame at a 90 % CL. [ABSTRACT FROM AUTHOR]