Yusuke TSUCHIKAWA R. Hashimoto, Q. He, T. Ishikawa, S. Masumoto, M. Miyabe, N. Muramatsu, H. Shimizu, Y. Tajima, H. Yamazaki, R. Yamazaki, and FOREST collaboration.

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Presentation transcript:

Yusuke TSUCHIKAWA R. Hashimoto, Q. He, T. Ishikawa, S. Masumoto, M. Miyabe, N. Muramatsu, H. Shimizu, Y. Tajima, H. Yamazaki, R. Yamazaki, and FOREST collaboration Research Center for the Electron Photon Science, Tohoku University Y. Tsuchikawa12014/2/21

Outline Y. Tsuchikawa22014/2/21

Motivation Baryon resonances have been experimentally studied by means of meson production reactions for understanding Quantum Chromo Dynamics. πN and ηN photoproduction reactions have been intensively investigated until now Y. Tsuchikawa32014/2/21 3 -> KY channel…

Motivation Born terms Y. Tsuchikawa2014/2/21

Y. Tsuchikawa52014/2/21 K. Tsukada et al., PhysRevC , PhysRevC

Research Center for Electron Photon Science (ELPH) STretcher-Booster Ring: 1.2 GeV electron synchrotron STretcher-Booster Ring: 1.2 GeV electron synchrotron Layout of ELPH ( ～ 2012) Photon beam line [ 11μΦ carbon fiber Picture?] Brems. Photon Linac Y. Tsuchikawa62014/2/21 Experiment

～ 3 % ～ 7 % ～ 5 % 192 Pure CsI PS 24 × 3 layers 252 Lead/SciFi mod.s PS×12 PS×18 62 Lead/Glass Liquid H2/D2 target Experiment (Forward) (Backward) Y. Tsuchikawa72014/2/21

Analysis – Outline Assumed as a spectator Y. Tsuchikawa82014/2/21

Analysis – particle identification Y. Tsuchikawa92014/2/21 Timing difference of 2 pions

2014/2/21Y. Tsuchikawa10 Analysis – particle identification → reject 4γ average timing

Analysis – Kinematical fitting Y. Tsuchikawa112014/2/21

Analysis yield estimation S/N ～ 10% Y. Tsuchikawa122014/2/21

Y. Tsuchikawa13 Analysis – Kinematics Ranges of CsI Emission Lab. frame (deg) Momentum (GeV)

2014/2/21Y. Tsuchikawa14 Analysis – Kinematics Accidental coincident events are subtracted by sideband

Analysis – Kinematics Emission Lab. frame (deg) Momentum (GeV) Y. Tsuchikawa152014/2/21 (Monte Calro simulation) Energy dependence of K0 emission angle

Y. Tsuchikawa162014/2/21 Analysis – Yield

Real Data GEANT4 Simulation Y. Tsuchikawa172014/2/21 Analysis – Yield Incident photon energy binned 30 MeV

Analysis – total cross section Y. Tsuchikawa182014/2/21 Very Preliminary

2014/2/21Y. Tsuchikawa19 Analysis – Background study 4 background candidates ✕ B.R. → mixed

2014/2/21Y. Tsuchikawa20 Analysis – Background study a.u.

Summary and Future plan Y. Tsuchikawa212014/2/21