Highlights from J-PARC g g Hadron Facility IPNS, KEK / J-PARC Center T.Takahashi 1. Introduction of J-PARC & Hadron Facility 2 2. History of J PARC History of J-PARC 3. E19 results 4. Other program 5 5. Effect of Earthquake Effect of Earthquake 6. Summary
J-PARC at Tokai Village J PARC at Tokai Village
RCS RCS Neutrino Neutrino ＭＬＦ Hadro Hadron Bird’s eye photo in Feb. 2008
Hadron Experim ental Hall at J- Hadron Experim ental Hall at J -PARC PARC Design Beam Power: 750kW ( 3.4x10 14 ppp, 50GeV-15 µ A ) Design Beam Power: 750kW ( 3.4x10 ppp, 50GeV 15 µ A ) 270kW ( 2.0x10 14 ppp, 30GeV-9 µ A ) 2010 Achievement: ~5kW ( ~6x10 12 ppp, 6sec. duration) K1.8 (2009 Oct.-) 2011 Plan: ~50kW • p max = 2.0 GeV/c • I ~10 6 ppp @ 1 8GeV/c • I K ~10 6 ppp @ 1.8GeV/c • Double stages Electrostatic Separators K1.8BR (2009 Feb.-) • K − /( π − + µ − ) ∼ 3.5@1.8GeV/c µ K1.8 K1 8 • p max = 1.1 GeV/c KL (2009 Oct.-) KL • I K ~10 6 ppp @ 1 GeV/c • p mean ~2 GeV/c K1.8BR K1.1 • I KL = 1.8x10 7 ppp 1 8 10 7 I • pencil-beam of 7.8 µ sr K1 1BR (2010 Oct ) K1.1BR (2010 Oct.-) • p max = 1.1 GeV/c • I K ~10 6 ppp @ 0.8GeV/c ppp K
History of J-PARC, His ory of J PARC, eps. on Hadron Facility Construction Start Apr. 2001 • 181MeV Acceleration at LINAC Jan.24 2007 • Complete of Civil Construction of Hadron Hall Jul. 2007 • 3 GeV Acceleration at RCS Oct.31 2007 • 3 GeV Beam Injection to MR May 22 2008 • 30 GeV Acceleration at MR Dec.23 2008 • Beam Extraction to Hadron Beamline Jan.27 2009 • Secondary Beam at K1.8BR Feb.12 2009 •
Typical Beam Profiles measured with Screen Monitors 1 (q01in) 1 (q01in) 2 (q02in) 2 (q02in) 5 (q11in) 5 (q11in) 6 (T0in) 9 (Dump in) 4 (v06in) 4 (v06in) 3 (v04in) 3 (v04in) 7 (q1Aout) 7 (q1Aout) 8 (T1in) 8 (T1in) Screen Monitor Locations January 27 th , 2009 1 2 3 1 2 3 5 5 8 8 9 9 4 7 6
於： ハドロンビームライン制御棟 ハドロン実験ホール 1st ビーム記念 WS 2009.3.25
The first secondary beam at K1.8BR Feb. 12 2009 1 1GeV/c 1.1GeV/c X Y X-Y profile at BDC fil t BDC BHD hit pattern BDC cm] BHD [c BLC T0 Feb. 12 Feb. 12 2cm/seg. BHD-T0 time difference [cm] π + Feb. 15 Δ T=2.4ns p -20 0 20 [ns]
History of J-PARC, His ory of J PARC, eps. on Hadron Facility Construction Start Apr. 2001 • 181MeV Acceleration at LINAC 181 Jan.24 2007 .24 2007 • Complete of Civil Construction of Hadron Hall Jul. 2007 • 3 GeV Acceleration at RCS Oct.31 2007 • 3 GeV Beam Injection to MR May 22 2008 • 30 GeV Acceleration at MR Dec.23 2008 • Beam Extraction to Hadron Beamline Jan.27 2009 • Secondary Beam at K1.8BR Feb.12 2009 • The First Neutrino Beam Apr.23 2009 • The first Beam at K1.8 & KL Oct.22 2009 • The first Beam at K1.1BR Oct.12 2010 • The First Physics RUN for E19 at K1.8+SKS Oct. – Nov. 2010 •
We have observed w/ ESS SKS charged and neutral kaons g -1.8GeV/c 1 8GeV/c in the secondary beam lines K 0L → π + π - π 0 ( K1.8BR , K1.8 ， KL and K1.1BR ) of Hadron Experimental Hall. of Hadron Experimental Hall +1 8GeV/c +1.8GeV/c K1 8 K1.8 K + KL π + w/o ESS w/ ESS K1.8BR +0.8GeV/c T1 target
E19 High Resolution Search for Θ + via the p(π - K - )X Reaction via the p(π ,K )X Reaction • K.Aoki, M.Ieiri, Y.Igarashi, S.Ishimoto, M.Naruki*, K.Ozawa, N.Saito, Y.Sato, S.Sawada, M.Sekimoto, S.Suzuki, H.Takahashi, T.Takahashi (KEK, Japan) S.Sawada, M.Sekimoto, S.Suzuki, H.Takahashi, T.Takahashi (KEK, Japan) • F.Hiruma, R.Honda, K.Hosomi, K.Miwa, T.Koike, M.Sato, H.Tamura, K.Yagi, T.O.Yamamoto, Y.Yonemoto, M.Ukai (Tohoku Univ., Japan) ) • K Imai H Sako S Sato K Shirotori (JAEA Japan) • K.Imai, H.Sako, S.Sato, K.Shirotori (JAEA, Japan) • K.Itahashi, T.N.Takahashi (RIKEN, Japan) • Y.Komatsu, S.Masumoto, K.Utsunomiya (Univ. of Tokyo, Japan) • K.Nakazawa (Gifu Univ., Japan) K Naka a a (Gif U i Ja a ) • S.Adachi, H.Fujioka, Y.Ichikawa, M.Moritsu, T.Nagae, M.Niiyama, H.Sugimura, A.O.Tokiyasu, N.Tomida (Kyoto Univ. , Japan) • R.Iwasaki (Nara Women’s Univ. , Japan) • N.Ishibashi, K.Matsuoka, H.Noumi, A.Sakaguchi, T.Tanaka, K.Yoshida (Osaka Univ., Japan ) ( ., p ) • M.J.Kim, R.Kiuchi, S.J.Kim, G.G.Joo, K.Tanida, S.B.Yang, C.J.Yoon (Seoul National Univ., Korea ) • B Bassalleck (Univ of New Mexico USA) B.Bassalleck (Univ. of New Mexico, USA) • P.Evtoukhovitch, A.Kulikov, D.Mzhavia, V.Samoilov, Z.Tsamalaidze (JINR, Russia) • A.Krutenkova, V.V.Kulikov (ITEP, Russia) • S Bufalino E Botta S Marcello A Feliciello M Agnello (Torino Italy) • S.Bufalino, E.Botta, S.Marcello, A.Feliciello, M.Agnello (Torino, Italy) • J.Franz (Freiburg, Germany) 71 persons, 15 Institutes
Production mechanism is a KEY Production mechanism is a KEY γ d → p K − K + (n) < 0.15 − 3nb • CLAS(2006) ( ) γ p ( ) γ C → K + K − (n) • LEPS(2009) 5.1 σ not inconsistent with each other due to strong angle/energy dependence γ p → K 0 K + n • CLAS(2006) < 0.8nb K + p → π + X • E559(2008) < 3.5 µ b/sr imply a very small coupling to K * ( g NK* Θ ∼ 0 ) CLAS: γ p → π + K − K + n Pion-induced Θ + production could be significant! PRL92(2004)032001 → K − Θ + ) ∝ Γ KN Θ ∝ σ ( π − p → N*(2420)
Previous Research: KEK-PS E522 Search for Θ + via the p( π − ,K − )X PLB635(2006)72 ( ) • K2 beamline + KURAMA at forward angle g � Resolution of 13.4MeV(FWHM) • Polyethylene target (CHx) • Beam momentum: 1.87, 1.92 GeV/c 3.3×10 5 π/spill • Intensity: • Time: 32 × 2 hours 7x10 9 π � � 7x10 9 • S/N : 2.5 σ / A bump structure !? at 1.53 GeV/c 2 • U.L. 2.9 µ b/sr only at P π =1.92 GeV/c π if true, d σ/ σ/ d Ω =1.9 µ b/sr (lab)
J-PARC E19 19 E19 Goal KEK E522 • K1.8 beamline + SKS • K2 beamline + KURAMA 0 － 18° at forward angle g � 2.5MeV (FWHM) 2 W � Resolution of 13.4MeV(FWHM) • Liquid H 2 target • Polyethylene target (CHx) � No quasi-free B G � No quasi free B.G. • 1.87, 1.92, and 1.97 GeV/c • Beam momentum: 1.87, 1.92 GeV/c � Energy Dependence • High Intensity of ～10 7 /spill 10 7 • Intensity: 3.3×10 5 π/spill � 4.8×10 11 π on target • Time: 32 × 2 hours for each momentum for each momentum 7x10 9 π � � 7x10 9 10 4 events (1.9 µ b/sr) • S/N : 2.5 σ / 10 events (1.9 µ b/sr) • U.L. 2.9 µ b/sr Sensitivity of 75nb/sr
E19 Step 1 Data-taking Oct.12ーNov.16, 2010 Oct 12 Nov 16 2010 Due to time structure of the beam (duty factor ～16%), i t intensity was limited to 1.1M/spill ( 1spill = 6 sec. ) it li it d t 1 1M/ ill ( 1 ill 6 ) Goal: To confirm Θ + with 10σ at 1.92GeV/c assuming 1.9μb/sr (E522) i 1 9 b/ (E522) RUN Summary total 272 hours (incl. down time) RUN Summary total 272 hours (incl down time) • Beamline & Detector Commissioning 52 hours • Calibration Data 64 hours � Beam Through � Empty target � p(π - K + )Σ - at 1 37 GeV/c 1.2×10 10 π 1 2×10 10 π � p(π ,K + )Σ at 1.37 GeV/c � p(π + ,K + )Σ + at 1.37 GeV/c 3.0×10 9 π � p(π - ,p)π - at 0.5 GeV/c 2.0×10 8 π • E19 Production Run 151 hours 7.8×10 10 π � p(π - ,K + )X at 1.92 GeV/c
Setup ー K1.8 Beam Spectrometer and SKS ー
Setup ー K1.8 Beam Spectrometer and SKS ー Beam momentum 1.92GeV/c BH2 BC3,4 K1.8 Beam π -beam Spectrometer BH1 eGC BC1.2
Setup ー K1.8 Beam Spectrometer and SKS ー SKS (2.45T) SKS (2 45T) Lucite 100msr solid angle Kaon SDC3,4 Cherenkov 0.7 < p < 1.0 GeV/c 0 7 1 0 G V/ TOF Aerogel SDC1,2 Cherenkov x2 M 2 of Particles ( Σ − RUN) π -beam
Liquid H 2 target Liquid H 2 target Continuous-flow Liquid Helium Cryostat Continuous flow Liquid Helium Cryostat Cell Size of 67.8 mm φ × 120mm L (PET) Window of 0.25mm Mylar (x2) Window of 0.25mm Mylar (x2) Z-vertex distribution by ( π − ,π ,π − ) St bl Stable operation during data-taking ti d i d t t ki B.G. contamination < 3% � δρ/ρ ≤10 −5
Spectrometers’ Calibration & Performance C lib ti & P f Meas. [MeV/c 2 ] PDG [MeV/c 2 ] B.S. [GeV/c] [ / ] SKS [T] [ ] [ / ] [ / ] Θ + RUN -1.92 -2.45 Σ + RUN 1189.37±0.07 +1.37 +2.45 1186.2 Σ − RUN 1197.45±0.03 -1.37 +2.45 1196.2 Adjust offset and scale factor (B → p ) of B S to reproduce PDG values Adjust offset and scale factor (B → p 0 ) of B.S. to reproduce PDG values Calibration error of ±1.4 MeV/c 2 Σ + Missing Mass Σ − Missing Mass Δ M FWHM =1.9 ± 0.1 MeV/c 2 Δ M FWHM 1.9 ± 0.1 MeV/c 1.5 MeV/c 2 (FWHM) resolution for Θ + (1530MeV/c 2 ) resolution for Θ (1530MeV/c )
p(π - K - )X Missing Mass p(π ,K )X Missing Mass • Expected resolution 1.5MeV/c 2 • No peak structure was observed • No peak structure was observed. � Present upper limit ~ 0.3 µ b/sr (averaged 2 ― 15 ° ) ~0.3 µ b (isotopic K distribution) ~0 3 b (i t i K di t ib ti )
Comparison with Theory T.Hyodo, Private Cominication 4 4 J P = 1/2 P 1/2 + 14 (π,Κ) PS Fs 500MeV Γ Θ =1 MeV PV Fs 500MeV PV “ 12 PS Fc 1800MeV PV Fc 1800MeV 10 PV “ b] ] σ [ µ b] σ [ µ 8 2 6 4 2 0 0 1800 2000 2200 2400 2600 1800 2000 2200 2400 2600 sqrts [MeV] [M V] [ MeV] [ MeV] s sqrts [MeV] s 0.3 µ b /sr −> 75nb/sr 0.3 µ b /sr > 75nb/sr = = 2120 MeV @ 1 92 GeV/c 2120 MeV @ 1.92 GeV/c s s Γ Θ = 1 MeV −> −> 0.25 MeV 2160 MeV @ 2.0 GeV/c
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