Yoshikazu Maeda RCNP For LEPS collaboration
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1 LEPS2 detector Yoshikazu Maeda RCNP For LEPS collaboration LEPS2 project Higher intensity and energy photon beam General purposed detector Detector design based on E949 detector Nagoya 08/12/7
2 Key words : t-channel process 1. Forward angle measurement γ Flavor selection M M 2. Polarized photon N Parity filter M B M B 3. Strangeness M 4. Decay particles Large acceptance
3 Requirement Detection of the multi-charged particles and neutral particles Reaction (MM) P/P~1% for 1GeV/c kaon at forward θ + π/κ separation. Decay (IM) Low momentum down to 01GeV/c 0.1GeV/c Wide polar angle, smooth and full acceptance p g, p for azimuthal direction Coplanarity Decay distribution Polarization measurement
4 New Beamline Project at SPring-8(BL31ID) Backward Compton Scattering SPring-8 SR ring 8 GeV electron BL31ID: Better divergence beam collimated photon beam BL31ID <σ x >=14 µrad Recoil electron (Tagging) Laser or re-injected X-ray Inside building High intensity Multi (ex. 4) laser injection & Laser beam shaping ~10 7 photons/s LEPS ~10 6 High energy Re-injection of X-ray Eγ < 7.5GeV 150m 30 m Outside building Experimental hutch
5 Experimental building for LEPS2 E949 at BNL kaon
6 BNL-E949 detector Designed for K + π + νν Solenoid 1 T Inner volume 2.22x2.96 m Range Stack counter Plastic scintillators 19 layers Energy and Range Barrel Photon detector Plastic & lead sandwich detector t 14.3X 0 Energy and position
7 Setup 2.22 m
8 Tracking system Side way tracker (TPC) R = 500 mm (24-26 layer), σ rφ =150um, σ z =2mm, 90 mm Forward MWDC chamber(450mm) 4 He+Ethane (X/X 0 = 1.1x10-3 ) 6 plane (x,x, u(45) u (-45), y y ) σ xy =150um, y Barrel tracker Cathode strip + Anode wire σ rφ = 250um, σ z = 2-3 mm Sensor 68x53mm 2 (Micron) ->896x6 channel(42chip) BELLE SVD2 SSD (Cylindrical+ i l+ Disk) Double side strip sensor σ=35um, Z< 1 mm at θ>20 0
9 P/P at forward region 2 o <θ< 17 o Vertex + Fd MWDC No SW tracker At 10 degree P/P = 1.3% (He4 gas) 1.9% (Air) θ > 17 o MS effect in SW tracker TPC Ar/CH 4 or Ne/CH 4
10 Momentum dep. of P/P 17 o
11 P/P at SW region (θ>30 o ) Ne 90%)+Methan(10%) IM [MeV/c 2 ] Λ pπ Λ pk K 0 π + π 2.6 θ + pk
12 PID for side region TPC E/E~5% Pion Kaon Proton Range counter K + π + π 0 and K + µ+ν(γ) (π/µ separation) 19 layers x19mm thick plastic For π/κ separation P< 1 GeV/c 15 layers (55 cm-89.6cm) High resolution TOF counter Stopped particle Barrel γ Peak EFF ~ 0.8(0.6) S/N~0.02(π/K=1) Non stopped due to Nucl. reaction Tracker
13 π/k sep of 6σ at 1.5 GeV/c T=50 psec Disk type DIRC Light correction from inner part No dead space T.Kamae et al, Nucl, Instr A382(1996) Quartz disk Aerogel (n<1.03) Chiba univ.
14 Magnet 2.22 m Detection of Neutron in RS Pn < 0.8 GeV/c TOF σ=500ps) ) Path : straight line. -> Beta -1 = 0.1 Pn/Pn = Beta/(1-Beta 2 ) x0.1 Θ = R/L 2 Z(=7.5cm) φ = 4 o (2π/24/12 1/2 ) m 2.96 TPC Helium Bag EFF( E>7MeV ee )=15-20%
15 Hyperon production at Eγ=2.4 GeV Θ Κ < 15 degree M=40 MeV/c 2 Strangeness tagging Θ Κ > 15 degree M=16 MeV/c 2 + γ + p K + Λ(1116 ) p π + γ + p K + Σ(1192) Λ γ M=2 MeV/c 2 Coplanerity Cut p π φ Κ+ φ Λ [deg]
16 Penta-quark Θ + M(K 0 )=2.4 MeV/c 2 Strangeness tagging γ + n K + Θ + CDC and TPC MC effect on LH2 targett p Κ 0 IM(π+,π ) [GeV/c2 ] π + π Invariant Mass measurement M(Θ + )=3.5 MeV/c 2 IM(π +,π,p) [GeV/c 2 ]
17 γp Λ(1405) ( ) π + π K 0 π + ( ) γ + p Κ + + Λ(1405) Σ + π n n π + π + Missing mass resolution for Λ(1405) 8 MeV/c 2 M [GeV/c 2 ]
18 Summary BNL-E949 is considered to be used as a large acceptance detector at SPring8/LEPS2. The detector was designed based on E949 solenoid only as a first step. SSD and Planer DC for forward,and TPC for large angle are considered for tracking system. P/P < 1.3% at θ lab > 10 degree 1.5 GeV/c kaon RS, TOF and DIRC counter are discussed for PID. R&D have to be made to have the realistic detector design.
19 Back up
20 γd Λ(1520)Θ + γd Λ(1520) ( ) Θ + γd Λ(1520) Θ + γd Λ(1520) ( ) Θ + K - p K - p K + n K - p K s p Missing Mass + Kinematical fit Invariant Mass M(Θ + )=17 MeV/c 2 M(Θ + )=10 MeV/c 2 M(Θ + )=3 MeV/c 2
21 Target
22 Barrel photon detector Fvis=0.3 Barrel photon detector 14.3 radiation length Attenuation length 90 cm speed of light cm /ns 16,18,20,21 layers E E = 1.5 E(MeV( ) By Tsunemi Eg. 15 MeV@100MeV Θ =? φ = 2 o (2π/48/12 1/2 )
23 Basic concept for tracking system σ P σ P P T rϕ T = 2 T 0.3 BL 720 N + 4 Forward part Θ< 20 deg SSD and Planer DC chamber Side part 20 < Θ < 90 deg TPC or CDC B=1T 0.5m 1.8 m σ =150um, N=13, P=1 GeV/c P/P = 0.5 % at Θ=10(deg) N=26, P= GeV/c P/P = 0.5 % at Θ=90(deg)
24 Multiple scattering effect for forward charged particle σ Pt P t P t = B β sinθ L X 0 L=1.8 m X/X Air 6.0 Ar 9.1 He4 0.3 Setup SSD + TPC(Ar) + planer DC(He4) SSD + CDC(He4)
25 GAS mixture for TPC Experiment Gas mixture Proportion Gas ρ X0 X0 n mp [g/ l] [g/cm2] [m] [1/cm] ALEPH Ar/CH4 91/9 He NA49 VTPC Ne/CO2 90/10 Ne NA49 MTPC Ar/CO2/CH4 90/5/5 Ar STAR Ar/CH4 (P10) 90/10 CH ALICE Ne/CO2 90/10 CO TESLA Ar/CO2/CH4 93/2/5 C2H TDR of PANDA
26 MWDC 6 wire plane x,x, u(45) u (-45), y y Z Window 6x Wire plane 7xCathode mm Cell structure t 10mm 10mm
27 Material for MWDC GAS X0 [m] X[mm] X/X0x10-4 He+Ethane(50%) Ar +IsoB(30%) Window [cm] [um] Mylar x Cathode plane [cm] [um] Mylar x Al 8.9 7x Cathode wire [cm] [um] CuBe(φ50um) Al(125um) Anode wire W(30um) Field wire CuBe(φ50um) Al(125um) Cathode plane CuBe for FW ΣX/X0= 1.1x10-3 (He) 1.5x10-3 (Ar) ->DP/P ~ 1 %
28 PID (Chrenkov) 30mrad (p K separation) at 2 GeV
29 Θ + γ θ c.m. d Λ(1520)
30 15 layers scinti π GeV/c K 0.5 GeV/c P 0.8 GeV/c 45 degree 2.96 m Magnet m TPC Helium Bag E [M MeV] MM 2 [GeV V/c 2 ] 2 π Κ p Momentum GeV/c 2
31 Mass spectra (p<0.3 GeV/c) π + π K + P K - MM 2 [GeV/c 2 ] 2 MM 2 [GeV/c 2 ] 2
32 Peak efficiency and BG(π) Peak efficiency 45 degree π contamination in Kaon cut Νπ/Νκ (1:1) K + p π + Κ
33 0.6<P<1.0 GeV/c Positive Negative P.E(K + ) ~0.8 π and p BG~ , P.E(K - ) ~
34 γp Κ + Λ Κ+ π p Cos Θ cm Θ lab Momentum [GeV/c] Momentum [GeV/c] Momentum [GeV/c]
35 γ η N γ(η) 32 MeV(σ M )
36
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