Status and hadron physics program - PowerPoint Presentation

1. Status and hadron physics program of J-PARCK. Ozawa (KEK)

2. ContentsStatus of J-PARCEffects of the earth quakePhysics programPenta-quark search KN & KNN bound stateMeson mass in nucleus 31/05/20122MESON2012, K. Ozawa

3. J-PARC (Japan Proton Accelerator Research Complex)Tokai, Japan50 (30) GeV Synchrotron (15 mA)400 MeV Linac (350m)3 GeV Synchrotron (333 mA)Material and Biological Science FacilityWorld-highest beam intensity : ~1 MW x10 of BNL-AGS, x100 of KEK-PSNeutrino FacilityHadron Hall60m x 56m31/05/20123MESON2012, K. Ozawa

4. Status of J-PARCAll components are back by the last DecemberThe first beam after the earthquake is delivered to Neutrino on Dec 24. Physics data are collected in FebruaryPenta quark search with a different beam energy Next Physics run will start on June 9th!31/05/20124MESON2012, K. Ozawa

5. Effects of the earth quake31/05/20125MESON2012, K. OzawaBuilding itself is almost OK, since it is fixed to a solid rock under the ground using piles. However, ground level has large effects like these photos. All damages are fixed.

6. Magnets are moved – re-aligned!31/05/20126MESON2012, K. OzawaMain Ring

7. Not only recover, Improvements!SX collimator to localize residual activationSolenoid coils to improve duty factor in Slow extraction.SX collimator31/05/20127MESON2012, K. Ozawa

8. physics program31/05/20128MESON2012, K. Ozawa

9. Nuclear & Hadron Physics at J-PARCL,XNZL, S HypernucleiLL, X HypernucleiStrangeness0Hypernuclei-1-2Proton BeamK1.8KLK1.1BRHigh p (not yet)SKSK1.8BRK1.1duudsPentaquark +He6Free quarksBoundquarksWhy are bound quarks haevier？QuarkMass without Mass PuzzleKaonic nucleusKaonic atomＸrayＫ−Implantation ofKaon and the nuclear shrinkageK meson31/05/20129MESON2012, K. Ozawa

10. KLK1.1BRNorth sideSouth sideHigh MomentumSKSK1.8BR

11. K1.8 Beam SpectrometerSKS SpectrometerQ10Q11Q12Q13D4

12. E19:Penta quark - results2010 dataNo peak of Q+ was observed.U.L. (90%CL) 0.26mb/sr (2－14°) in 1.51－1.55GeV/c2U.L.(90%CL) of GQ 0.72 MeV (1/2+) 3.1 MeV (1/2-)Search for the Θ+ via the p+π-→K-+X　Reaction at 1.97GeV/carXiv:1203.3604Submitted to PRLPositive comment, revised version is submitted31/05/201212MESON2012, K. Ozawa

13. Q+ RUN at 2.0 GeV/c 8.7 ×1010 p- S+ RUN at 1.37 GeV/c 8.5 ×108　 p+ S- RUN at 1.37 GeV/c 4.8 ×109　 p- S- RUN at 1.45 GeV/c 8.8 ×109　 p-S- at 1.37GeV/cDM=1.87MeV/c2(FWHM) ⇔ 1.86MeV/c2(FWHM) 1st step RUN13Penta quark – additional data E19 2nd step Run at 2.0 GeV/c was completed after the earthquake.Beam momentum is slightly increased to have larger cross section for penta quark productionExcept for the beam momentum, experimental setup is the same as the previous run 8.7×1010 p- on Liq-H2 with 1.7M/spill beam (7.8×1010, 1.1M/spill at 1.92GeV/c in 2010 RUN) 31/05/2012MESON2012, K. Ozawa

14. E15:KN Interaction Study by Nuclear Bound-States14Physics motivationExperimental setupExperimental schemeExperiment is ready for beam31/05/2012MESON2012, K. Ozawa

15. Results of the last run (Cont’d)CDS and Liquid Helium target system successfully workedReady to explore kaonic-nuclei @ K1.8BRXY planeYZ planeLiquid 4He insideTarget-image together with material around has been reconstructed by the CDSCharged particles from the target have been successfully identified by the CDS15pp- invariant-mass spectra reconstructed by the CDSL~10,000 Ls have been accumulated31/05/2012MESON2012, K. Ozawa

16. 16E27: Search for “K-pp” bound state in the d(p+,K+)X reaction“K-pp” is produced through L* doorway in the d(p+,K+) reactionSemi-exclusive measurement by Range Counter Array (RCA) in order to suppress quasi-free B.G.K-pp ® L p1, L ® p2 p-K-pp ® S0 p1, S0 ® (Lg) ® p2 p- g p+d ® L* K+ p1s, L* ® S p, S+ ® p2 p0Beam: 3M/spill beam3.6x104 L* /dayAssuming 1% trapping probability360 bound states/day ( inclusive )~45 events/10 days (exclusive) with eRCA ~14% for two protonsnpK-ppdΛ*π+K+RCAK+p31/05/2012MESON2012, K. OzawaMissing mass d(π+,K+) [GeV/c2]Momproton>350MeV/ccounts (/3M beam・10days )Expected point by FINUDA, DISTO

17. NZNu ~ Nd ~ NsHigh DensityStrangeness in neutron stars ( r > 3 - 4 r0 ) Strange hadronic matter (A → ∞) L, S HypernucleiLL, X ハイパー核Strangeness0-1-2“stable“ 3D nuclear chartNext: Strangeness Nuclear Physics (K-,K+)、E03,E05,E07(p-,K+)、E10、(K-,p-)、E13→High density matter, Generalized nuclear force …→First step to understand strangeness nuclear matterAs increasing of intensity,K beam experiment becomes feasible.Many experiments are already approved.31/05/201217MESON2012, K. Ozawa

18. Vector Meson mass in nucleusHigh energy heavy ion collisionsSPS-NA60 (PRL 96 (2006) 162302)Modification of r meson due to hadronic effectsRHIC-PHENIX (PRC81(2010) 034911)Origin of the enhancement is under discussion Nuclear targetsCBELSA/TAPS (Phys.Rev. C82 (2010) 035209)Modification of w is not observedJ-LAB CLAS G7 (PRL 99 (2007) 262302)Mass broadening of r due to hadronic effectsKEK-PS E325 (PRL 96 (2006) 092301)Peak shift and width broadening of r/w2012/3/1618Clear measurements are required to clarify it.Many measurements are already doneLarge uncertainty in background subtraction methodPionic atom is a good example and see Prof. Itahashi’s talk tomorrow.

19. Measurements of f meson at KEK-PS.2012/3/1619R. Muto et al., PRL 98(2007) 042581Indication of mass modification! Cubg<1.25 (Slow)e+e- invariant massDecays inside nucleusDecays outside nucleusmeson has mass modificationModification is shown as an Excessmeson has NO mass modificationBlue line shows expected line shape including all experimental effectswo mass modificationThe only one measurement on medium modification of f meson.

20. 2031/05/2012Target/Momentum dep.bg<1.25 (Slow)1.25<bg<1.75Only one momentum bin shows a mass modification under the current statistics.To see clear mass modification, significantly larger statistics are required. e+e- invariant massTwo nuclear targets:Carbon & CopperInside-decay increases in large nucleus Momentum binSlowly moving f mesons have larger chance to decay inside nucleusSame as previous slideExcessMESON2012, K. Ozawa

21. Next Goal31/05/201221PbProtonA clear shifted peak needs to be identified to establish QCD-originated effectsMomentum DependenceE325 resultsExtrapolateMESON2012, K. Ozawa100 times larger statistics are required.

22. Calc. with other models31/05/201222 bg<0.5 0.5<bg<1.25 bg<0.5 0.5<bg<1.25CuPbPbCuE325 Dm : 35 MeV(28 ~ 41) : 15 MeV(10~23)Oset, Ramos(NPA 679, 616)Dm : 10 MeV G : 15 MeVKlingle, Waas, Weise (PLB431,254)Dm : 10 MeV G : 50 MeV---Dm : 35 MeV G : 50 MeVcf. Hatsuda, Lee (PRC46, 34)Dm : 12~44 MeV G : not estimatedblue: decays inside nuclei red: decays outside nucleiHadronic modelHadronic modelMESON2012, K. OzawaAt J-PARC, clear mass spectra in nucleus will be obtained to compare with models.

23. Experiment31/05/201223Cope with 1010 per spill beam intensity (x10)Extended acceptance (90 in vertical) (x5)Increase cross section (x2)MESON2012, K. OzawaConstruct a new beam line and new spectrometerDeliver 1010 per spill proton beam Primary proton (30GeV) beam New high momentum beam line

24. Detector components31/05/201224 100x100 200x200 300x300Position resolution of 100m is achieved GEM Tracker HBD (Hadron-Blind Cherenkov detector )Developments of detectors are almost done.Remaining issue is photo-electrons HBD (half of an expectation).Read out electronics are being developed.Basically, combination of existing components. The first production will be done by the next March.Key Technology:CsI evaporated GEM as a photo cathodeQ.E. of 40% is achieved MESON2012, K. Ozawa

25. E29: f bound state?31/05/2012MESON2012, K. OzawassuudK+ΛΦpudsusfp -> K+Lpp -> ff25Mass shift of f in nucleus can produce a bound state?ProductionDetection

26. E26: Omega in nucleus31/05/201226gggpwp0np-A   + n+Xp0gMeasurements of w meson in nucleusProduction of w is also measuredFocus on low momentum w meson ConstructNeutron counterGamma Detector Beam Momentum is 2.0 GeV/cIt can be done at K1.8 and also at new high momentum beam lineMESON2012, K. OzawaH. Nagahiro et al, Calculation for 12C(p-, n)11BwMissing Mass(Bound state?)Invariant Mass

27. Experiment for h2008/3/6NP08@Mito, K. OzawaLOI by K. Itahashi et. alCalc. by H. Nagahiro, D. Jido, S. Hirenzaki et. alForward neutron is detected.missing mass distribution is measured.In addition, measurements of invariant mass of N* decay Simulation

28. SummaryJ-PARC is recovered from damages of the earth quake. Thanks for your helps and efforts.New data for penta quark search is already collected. An experiment for K bound state search is ready and will take data in this year. Many experiments will be done in few years including hyper nuclear physics, K-barN boundstates, mesons in nucleus, and more.31/05/201228MESON2012, K. Ozawa

29. Back up31/05/201229MESON2012, K. Ozawa

30. Run time: 19-22 Feb Beam PW: 3.3kw~ 6x108 K- on Target~25M events recordedResults of the last run (Feb. 2012) Ready to receive more than 10kW beam-powerParameters for Kaon tune have been produced [ /spill ]3.3kW10kWbeam intensity100k300kK- yield33k100kE15 trig. rate7002.1kexpectedK-pp-CM (A)Yield/TM30ESS=±250kVbeam-line commissioning for 1GeV/c K- was completed31/05/2012MESON2012, K. Ozawa

31. Mass spectra measurementsmr = m0 (1 -  /0) for  = 0.0931/05/2012MESON2012, K. Ozawa31Induce 12 GeV protons to Carbon and Cupper target, generate vector mesons, and detect e+e- decays with large acceptance spectrometer.Cu we+e-re+e-w/r/fThe excess over the known hadronic sources on the low mass side of w peak has been observed.M. Naruki et al., PRL 96 (2006) 092301KEK E325, r/w  e+e-

32. CLAS g7a @ J-Lab31/05/2012MESON2012, K. Ozawa32Induce photons to Liquid dueterium, Carbon, Titanium and Iron targets, generate vector mesons, and detect e+e- decays with large acceptance spectrometer.R. Nasseripour et al., PRL 99 (2007) 262302mr = m0 (1 -  /0) for  = 0.02 ± 0.02No peak shift of r Only broadening is observedgw/r/f

33. Contradiction?Difference is significantWhat can cause the difference?Different production processPeak shift caused by phase space effects in pA?Need spectral function of r without nuclear matter effectsNote: similar momentum rangeE325 can go lower slightly31/05/2012MESON2012, K. Ozawa33In addition, background issue is pointed out by CLASCLASKEK

34. Approved experimentsStage 1Stage 2RunningK1.8K1.8BR

35. As increasing the beam intensity, ニュートリノとビームタイムを分け合って実験を行う。加速器部と協力してビーム強度を増強する！これからが新たな成果が出てくる時期！