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Hadron Physics Experiments at J-PARC - Current Status and Future Prospects

Megumi Naruki (KEK). Hadron Physics Experiments at J-PARC - Current Status and Future Prospects. Contents. Overview of J-PARC Hadron Facility Facility & Physics Programs Current Status beam commissioning spectrometer performance S earch for Pentaquark Q + in Hadronic Reaction

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Hadron Physics Experiments at J-PARC - Current Status and Future Prospects

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  1. Megumi Naruki (KEK) Hadron Physics Experiments at J-PARC- Current Status and Future Prospects

  2. Contents • Overview of J-PARC Hadron Facility • Facility & Physics Programs • Current Status • beam commissioning • spectrometer performance • Search for PentaquarkQ+ in Hadronic Reaction • J-PARC E19 experiment : p–pK–X • Future Plan • other pentaquarks, tetraquarks

  3. neutrino J-PARCbird’s-eye view 400MeV LINAC 3GeV PS (RCS) n Materials &Life Science Facility 50GeV PS (MR) slow extraction section Hadron Experimental Facility

  4. multi-strangeness hypernuclei PentaquarkQ+ d s Nuclear & Hadron Physics at J-PARC u L,X u d double-L Exotic Hadrons Strangeness Physics Ｋ− atom f SKS L6LHe K1.8 KL nuclei K1.8BR K1.1 Ｘ ray High momentum K1.1BR f(1020) kaonic atom Origin of Hadron Mass kaonic nuclei

  5. High Intensity Kaon Beams Hadron Experimental Facility • pmax = 1.1 GeV/c • IK~106ppp • Large Exp. Area K1.8BR K1.8 Production Target Loss of 30% • pmax= 2.0 GeV/c • IK~106ppp • Double-stage • Electrostatic Separators proton KL K1.1BR • primary proton • pmax = 51 GeV/c • Ip~109~12ppp high momentum • pmax = 0.8 GeV/c • IK~106ppp

  6. s － u Double-Strangeness Hypernuclei J-PARC E05 Experiment high intensity kaon beam (K1.8) + SKS spectrometer Ξ－（dss) K－ K＋ Expected Spectrum Ξ-hypernuclei nuclei 12C • discovery of X-hypernculei • X-nucleus interaction • structure of the neutron star • explore multi-strangeness hadronic systems － s u green: X-nucleus potential = 20MeV magenta: X-nucleus potential = 14MeV

  7. T. Hiraiwa, Parallell A1, Friday proton L p- proton A search for deeply bound kaonic nuclear states by in-flight 3He(K-,n) reaction J-PARC E15 Experiment @ K1.8BR prediction for nucleon density distribution by AMD r ~ 10r0 : extremely dense system A.Dote et al., PRC70 (2004) 044313. • Does the deeply bound state really exists? neutron 3He K-pp K- Missing mass Spectroscopyvia neutron Invariant mass reconstruction decay clarify the kaon nucleus interaction quantitatively

  8. u u d Origin of Hadron Mass - J-PARC E16 - In Hot/Dense Matter In Vacuum spontaneous breaking of chiral symmetry u u d Current quarks ~ 5 MeV/c2 Hadrons ~ 1000 MeV/c2 Constituent quarks ~ 300 MeV/c2  vector meson mass in nuclear matter e- φ proton e+ nuclear target(p,C,Pb) high momentum beamline + E16 Spectrometer

  9. Beam Requests from Stage-2 Experiments 30 GeV, 9μA = 270 kW, 2 x 1014 protons/3.6s K1.8 (SKS)

  10. Beam Requests from Stage-2 Experiments 30 GeV, 9μA = 270 kW, 2 x 1014 protons/3.6s K1.8BR KL

  11. Milestone • First Beam Extraction2009/1/27 • First Kaon Beam 2009/3 • Completion of K1.8 beamline 2009/10 • Construction of K1.1BR beamline • high momentum beamline？ • Extension of Hadron Hall　？？

  12. 1 (q01in) 2 (q02in) 5 (q11in) 6 (T0in) 9 (Dump in) 3 (v04in) 4 (V06in) 7 (q1Aout) 8 (T1in) The First Shot 2009/1/27

  13. Milestone • First Beam Extraction2009/1/27 • First Kaon Beam 2009/3 • Completion of K1.8 beamline 2009/10 • Construction of K1.1BR beamline • high momentum beamline？ • Extension of Hadron Hall　？？

  14. The First Kaon at J-PARC time difference between p & K ~ 2.4nsec (Expected: 2.3 nsec @ 1.1 Gev/c e++m++p+:K+ ~ 9000:40 (Expected : p+:K + ~ 540:1 @ 1.0 GeV/c)  Identify K + on TOF the spectrum Beamline Tuning @K1.8BR 2009/2 By T. Suzuki

  15. Milestone • First Beam Extraction2009/1/27 • First Kaon Beam 2009/3 • Completion of K1.8 beamline 2009/10 • Construction of K1.1BR beamline • high momentum beamline？ • Extension of Hadron Hall　？？

  16. – Purity & Yield at Kaons @ K1.8 TOF of beam particle in “K” trigger p- ES1/ES2 OFF K- 20.5% p ES1 ON ES2 OFF 38.5% K- : 7k/2.5E+12 ppp K+ : 40k/2.5E+12 ppp ES1/ES2 ON 83.4% consistent with design value 8% in non-biased trigger *still rough tuning K/p will be much more improved

  17. Milestone • First Beam Extraction2009/1/27 • First Kaon Beam 2009/3 • Completion of K1.8 beamline 2009/10 • Construction of K1.1BR beamline • high momentum beamline？ • Extension of Hadron Hall　？？ now

  18. South part North part KL SKS High Momentum K1.8BR K1.1BR

  19. Milestone • First Beam Extraction2009/1/27 • First Kaon Beam 2009/3 • Completion of K1.8 beamline 2009/10 • Construction of K1.1BR beamline • high momentum beamline？ • Extension of Hadron Hall　？？ now

  20. High Momentum Beamline SM1: branched by 5° Vertical Bend 3.9° 5.8°x3 Experimental Area beam dump

  21. Phase II : Hall Extension

  22. E19 experiment K1.8BR K1.8 K1.1BR proton KL

  23. PRL 96, 042001 (2006) Production Mechanism consistent with each other: since there is strong angle / energy dependence. it implies a very small coupling to K*. gNK*Q+ ∼ 0 Q+ production in hadronic reaction CLAS PRL 92 032001 (2004) g p+ • small angle dependence • inverse proportion to energy p- K- K+ n proton Q+ cf: g p →p+ K- K+ (n) n

  24. KEK-PS E522 experiment if exist pp=1.92 GeV/c • Q+ search via p–pK–X • K2 beamline + KURAMA • beam momentum : 1.87, 1.92 GeV/c • target : Polyethylene • intensity : 3.3 X 105p– /spill • beam time : 32 hours for each momentum  ~ 7 X 109p- • Mass resolution : 13.4MeV(FWHM) a bump was observed at M =1530.8MeV/c2 at pp=1.92 GeV/c but : S/N = 2.5s upper limit : ds/dW < 2.9mb/sr ds/dW= 1.9 mb/sr  stot= 2.9 mb

  25. Magnetic Field: 2.4T Acceptance : 0.1sr Weight : 300 tons J-PARC E19 experiment • K1.8 beam line + SKS • 2GeV/c p- +p  K- + Q+ • target : liquid H2, reuse E559’s • SKS : • momentum coverage : 0.7-0.95GeV/c • angle coverage ≤ 20° • pscatteredup to ~ 1.1 GeV/c • dp/p ~ 0.2% @ 1GeV/c • (~5 times better thanKURAMA) • DM =2.5MeV FWHM • ideal for Q+ detection K- 2GeV/c p-

  26. Expected Missing Mass Spectrum 1.9b/sr KEK PS E522 significance : 62s assuming G < 2MeV s = 1.9mb sensitivity 75nb/sr

  27. SKS Spectrometer Q13 Q12 K1.8 BeamSpectrometer D4 Q11 Q10

  28. Spectrometer Performance S- p(p-,K+)S- @1.25GeV/c Target: Liq-H2(0.86g/cm2 ) (750k/spill x 18hour) • Expected: • Dp/p(Beam) = 3.3x10-4(FWHM) • Dp/p(SKS) = 4.5x10-3(FWHM) Measured: DM = 1.66±0.05 MeV (FWHM) DpSKS ~3.3 MeV/c (FWHM)@ 0.7 GeV/c ready for E19! M = 1.201 GeV(1.1974 GeV) for p(p-, K-)Q+ @1.92 GeV/c : DM ~1.76 MeV

  29. In FUTURE… • other pentaquarks: cascade X5--(1862) , charmed Q0c(3100) • K-nX--K+, pth=2.4GeV • ppppQ0cX, pth=12.3GeV • tetraquark: Q+(udss) , Q+ “family” • Y. KANADA-En’yo et. al. : Jp=1+ , M=1.4GeV, G=20~50MeV, Q+K+K+p- • Burns et al. : Jp=1- , M=1.6GeV, G<100MeV • Karliner & Lipkin : Jp=0+ • K+pK+pQ+ X pth=3.7GeV • K+pLQ+ X pth=2.8GeV • K+pS+Q+pth=3GeV

  30. High momentum secondary beams at high-p beam line SM1: branched by 5° Vertical Bend 3.9° 5.8°x3 • Secondary Beams: • Use a thin (2% = 15kW loss) target at SM1 • Collect them at forward angles • Transport them for ~120m

  31. Power upgrade plan of SX

  32. Summary • Current Status • K and p Yield is consistent with the expectation • Spectrometer performance is good enough to reach the expected sensitivity. • J-PARC E19 searches for Q+ in p–pK–Q+raction • K1.8 beamline + SKS is ideal for Q+ • significance ~60s, sensitivity ~75nb/sr • with mass resolution of 2.5MeV(FWHM)

  33. Bakups

  34. Spill Structure EQ off RQ Algorithm#3 Main Gain = 20 Int. Gain = 100 Shot#21025

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