1 / 36

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

alaura
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related