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Photoproduction of charged pions on deuteron

Photoproduction of charged pions on deuteron. Y uncheng H AN( 韩 运成 ) for the NKS2 Collaboration School of Nuclear Science and Technology, Lanzhou University Department of Physics, Tohoku University. Collaboration List. Department of Nuclear Science, Lanzhou University, China ,

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Photoproduction of charged pions on deuteron

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  1. Photoproduction of charged pions on deuteron Yuncheng HAN(韩运成) for the NKS2 Collaboration School of Nuclear Science and Technology, Lanzhou University Department of Physics, Tohoku University A workshop on Hadron Physics@LZU, Lanzhou

  2. Collaboration List Department of Nuclear Science, Lanzhou University, China , Y.C. Han , T.S. Wang Department of Physics, Tohoku University, Japan N. Chiga, Y. Fujii, T.Fujibayashi, K. Futatsukawa, O. Hashimoto, K. Hosomi, A. Iguchi, H. Kanda, M. Kaneta, M. Kawai, D. Kawama, T. Kawasaki, S. Kiyokawa, T. Koike, Y. Ma, K. Maeda, N. Maruyama, M. Matsuzawa, A. Matsumura, M. Mimori, Y. Miyagi, K. Miwa, S.N. Nakamura, Y. Okayasu, T. Otani, K. Shirotori, H. Tamura, N. Terada, K. Tsukada, T. Yamamoto, K. Yokota Laboratory of Nuclear Science, Tohoku University K. Hirose, T. Ishikawa, H. Shimizu, K. Suzuki, T. Tamae, H. Yamazaki Ichinoseki National College of Technology O. Konno Department of Electrical and Electric Engineering, Akita University, A. Sasaki A workshop on hadron physics@LZU, Lanzhou

  3. Content • Introduction • Experimental setups • Analysis and results • Summary A workshop on hadron physics@LZU, Lanzhou

  4. Study of pion photoproduction • Photoproduction on proton: Locate and identify pion nucleon resonances. • Photoproduction on neutron (deuteron): Elementary production amplitude, isospin symmetry. • Photoproduction on nuclei: Modifications of the resonance excitation and their subsequent propagation and decay, brought by the nuclear medium. A workshop on hadron physics@LZU, Lanzhou

  5. Quasi-Free process Non Quasi-Free process Motivation: gd→p-pp,esp. NQF process A workshop on hadron physics@LZU, Lanzhou

  6. D++ (uuu) D- (ddd) Motivation:Study ofgd→npp+p- reaction A workshop on hadron physics@LZU, Lanzhou

  7. Tagged Photon Beam at LNS-Tohoku 0 5m Neutral Kaon Spectrometer 2 200 MeV electron beam from LINAC Sweep magnet Photon tagging system Stretcher-Booster Ring Emax=1.2 GeV Radiator A workshop on hadron physics@LZU, Lanzhou

  8. Photon Tagging System Photon beam • Electron beam on carbon fiber • Tagged by scattering electron • E=0.8-1.1 GeV from 1.2 GeV mood electron beam mode • 6 MeV coverage per tagging counter Tagger Backup Tagger Finger Radiator A workshop on hadron physics@LZU, Lanzhou

  9. NKS2 Setup Electron Veto Counter (EV) 680 Dipole Magnet Inner Hodoscope (IH) & Outer Hodoscope (OH) 20 cm LD2Target Photon beam 1 m Cylindrical Drift Chamber (CDC) & Straw Drift Chamber (SDC) Photon beam A workshop on hadron physics@LZU, Lanzhou

  10. Analysis • Time selection • Track selection • Vertex position • Particle Identify • Channel selection for gd→p-pp and gd→ np p+p- → suppress accidental coincidence → suppress noisy of Drift Chamber → target region select A workshop on hadron physics@LZU, Lanzhou

  11. Channel selection of gd→(p-pp)3Tr For reconstructed gd→p-pX mass Mmissing , 0.8<Mmissing<1.1 (GeV/c2); For reconstructed gX→p-pp mass Mtarget , 1.75<Mtarget<2.1 (GeV/c2); A workshop on hadron physics@LZU, Lanzhou

  12. Channel selection ofgd→npp+p- Px<0.2 GeV/c: quasi-free; Px>0.3 GeV/c: non-quasi-free process; mx ~ mpeak±3s; A workshop on hadron physics@LZU, Lanzhou

  13. Sub-channel fitting forgd→(npp+p-)NQF A workshop on hadron physics@LZU, Lanzhou

  14. Calculation and various parameters The cross section is obtained as, Y is the yield, Ng is the number of photon, Ntis the effective deuteron target thickness, εDAQis efficiency of data acquisition system, εaccptanceis the acceptance decided by simulation. εtrackis the efficiency of track reconstructing. A workshop on hadron physics@LZU, Lanzhou

  15. Cross section ofgd→(p-pp)QF Author Eg Bin/ MeV Benz 100 Scheffler 25 Hirose 24 This work 6 A workshop on hadron physics@LZU, Lanzhou

  16. Cross section ofgd→(p-pp)NQF Errors are 10% 300 MeV A workshop on hadron physics@LZU, Lanzhou

  17. Egcalibration bygd→(p-pp)3Tr 4-momentum conservation:Lg=Lp+Lp1+Lp2-Ld HAN Yun-Cheng, Wang Tie-Shan, et. al., Chin. Phys. C, Accepted A workshop on hadron physics@LZU, Lanzhou

  18. Comparison of s(gd→ D++D-) A workshop on hadron physics@LZU, Lanzhou

  19. Summary Photoproduction gd→p-pp and gd→npp+p-are studied with tagged photons by using NKS2@LNS-Tohoku. • s (gd→(p-pp)QF) agrees well with the previous obtained data. • we get s (gd→(p-pp)NQF),and used to calibrate Eg; • s (gd→D++D- )are smaller than the previous obtained data and theory study; • In the future, differential cross sections will be studied, and experiments in the lower energy region are scheduled. A workshop on hadron physics@LZU, Lanzhou

  20. Thanks for your attention! A workshop on hadron physics@LZU, Lanzhou

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