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HD Project and Future

HD Project and Future. 29 July 2005 M. Fujwawa@rcnp. Physics ? What we can have as a strategic device ? New projects: Polarized proton and deuteron target: “HD project”. Collaboration with H. Kohri, M. Tanaka, N. Muramatsu, T. Hotta, M. Yosoi,

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HD Project and Future

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  1. HD Project and Future 29 July 2005 M. Fujwawa@rcnp Physics ? What we can have as a strategic device ? New projects: Polarized proton and deuteron target: “HD project” Collaboration with H. Kohri, M. Tanaka, N. Muramatsu, T. Hotta, M. Yosoi, J.P. Didelez, G. Roiulle (ORSAY)

  2. LEPS spectrometer TOF SVTX DC1 AC(n=1.03) g ray beam LH2 Target Dipole Magnet 0.7Tesla Start Counter DC2 DC3

  3. Missing mass spectrum • p(g,K+)L (1116) 72,500 events • p(g,K+)S0 (1193) 48,900 events • 1.5 ~ 2.4 GeV • 0.6 < cosqcm < 1 Photon beam asymmetry

  4. Photon beam asymmetry S Asymmetry (2) ds ds dW dWv ds ds dWunpol dWunpol ds dWh • Vertical= [ 1 + PgScos(2f) ] • Horizontal = [ 1 - PgScos(2f) ] N = Facc = PgScos(2f) • N : K+ photoproduction yield • f : K+ azimuthal angle • Pg: Polarization of photon • n : Normalization factor for Nv nNv- Nh nNv+ Nh For all events

  5. Spin observables? Beam asymmetry Nakayama & Tsushima: Phys. Lett.B583,269(2004) for the positive parity ofQ+ the beam asymmetry is significantly positive, whereas for the negative parity of Q+ beam asymmetry is significantly negative

  6. Physics motivation SPIN CRISIS ! Nucleon Spin Sum Rules • Gerasimov-Drell-Hearn (GDH) • Forward Spin-Polarizability ss contents in nucleon Q+ spin-parity

  7. Q+ spin-parity determination Zhao and Al-Khalili PLB585(2004)91 Beam-target double polarization asymmetry 1/2 + 1/2 -

  8. f-meson photoproduction @ LEPS of SPring-8 Studying diffractive channels as a tool for non-perturbative QCD (Pomeron structure, search for glueball, f2’-meson trajectories, etc ) Non-polarized observables are not suitable for this study Search for exotic processes as ss-knockout Henley et al. [94] Titov, Yang, Oh [94-98]

  9. ss contents in proton ・　f-meson: ~ ss g pf p pomeron exchange + p exchange + ss knock-out Study small amplitudes by interference  double polarization asymmetry

  10. Reconstructed fevents (K+K- event) Proton(938) f(1019) events /2.5MeV events /2.5MeV s =10 MeV Missing mass (g,K+K-)X (GeV) f Invariant mass (K+K-) (GeV) Invariant mass square (K+K-) (GeV2) Selections for f event (KK mode) |M(KK)-Mf |< 10 MeV |MM((g,K+K-)X)- Mproton|< 30 MeV Invariant mass square (K-p) (GeV2)

  11. beam-target double spin asymmetry forg p f p Titov et al. PRC58(1998)2429

  12. K+ g K- g K+ Polarization observables with linearly polarized photon( in f meson rest frame) K+ K- Decay direction// to direction of beam Spin-flip processes in Pomeron and f2’… g Decay Plane // g natural parity exchange (-1)J (Pomeron, Glueball, scalars`) Decay Planeg unnatural parity exchange -(-1)J (Pseudoscalar mesons p,h)

  13. ss-quark content of proton and neutron |p>=a|uud> + b|uudss>

  14. G0 experiment at JLAB: Anapole moment e Z0 e This simple picture depicts pairs of strange quarks as they pop into and out of existence alongside the permanent quark residents of the proton. Nuclear physicists have found that strange quarks, though present for just tiny fractions of a second at a time, also contribute to the proton's properties. Image: JLab SPIN CRISIS  at least 10% ss content in nucleon

  15. Double polarization asymmetry - • f meson: pure ss

  16. Beam-targetasymmetry and exotic processes with unnatural parity exchange ( -knockout) ss LEPS Spring-8

  17. sp – sA (sp - sBG) – (sA - sBG) CBT= = (sp - sBG) + (sA - sBG) sp + sA - 2sBG sBG R= DCBT 2 (sp + sA)/2 ( ) = CBT R2 + Dsp 2 2 2 ( ) (1-R)2 2CBT(1-R) 2 2 sp 2 2 DsBG 2 {1-CBT(1-R)}+CBTR ( ) sBG Error estimation for CBT measurement

  18. Polarization in thermal equilibrium If I=1/2, | -1/2> DE=gmNB |+1/2> proton : gpmNB/2kT=0.00101 B(T)/T(K) electron: gemBB/2kT=0.67 B(T)/T(K)

  19. Principle of HD • Longstanding effort at Syracuse, LEGS/BNL ORSAY • 10-20 mK • 15-17T • 80% for H, 20% for D (vector) • 20%70% in D with DNP

  20. Thanks to H. Toki for the RCNP- ORSAY collaboration HD distillator RCNP In 2006

  21. Present status • LEGS/BNL (Syracuse) Future • RCNP ( Spring-8) goal: 10m K, 17 T

  22. LEGS@BNL

  23. HYDILE target @Orsay 70 K Shield Liquid 4He (4.2 K) Saddle coils Al Wires PolarizedHD NMR Coils Liquid 3He (0.5 K) Solenoid Coil

  24. 偏極陽子・重陽子標的装置

  25. RCNP低温施設 • 施設整備 • 電力ライン • 冷却システム

  26. 1K Pot 1220mm 538mm Mixing Chamber Null Coil 170mm 70mm Correction Coil 550mm Main Coil NbTi joints & Switch Nb3Sn joints & Protection Circuit 600mm Rough dimensions of the magnet 400mm

  27. Field profile around Magnet Center Field profile around Mixing Chamber

  28. Z(mm) 1K Pot B(T) 538mm 70mm 170mm Mixing Chamber R(mm) R(mm) Field profile around Mixing Chamber Stray Field profile around Magnet

  29. Road map (5 years from 2005 fiscal year) for Studies of Hardron structures Fiscal year 2005 2006 2007 2008 2009 After 2010 Charged meson production Experiments with magnetic spectrometer （DR＋SC magnet） Collaboration with Roma2、ORSAY、US HD gas、IBC、TRC、others Spin and parity determination of Q+ particle HD at Spring-8、f-meson production, K-production, hidden strangness of nucleon IBC cryostat and new Data taking system Roma2, ORSAY Neutral particle detection with Scintillator ball TRC NMR DR+IBC SRC New DR HD polarization Polarized HD  SPring-8 New TPC design Scintillator ball、TPC Installation of new detectors Scintillator ball total About 480,000 kyen 92,507 kyen total 103,000 103,000 93,000 93,000 83,505 New badget 96,000 96,000 86,000 86,000

  30. Summary CBTmeasurements with polarized target HD at SPring-8 • g+ p  p0 + p • + p  K + L, K+S • g + p  w + p JAPAN-KOREA-CHINA Three country conference in February 2006 “Hadron and Nuclear Physics with Photons” supported by RCNP and APRC

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