LEPS Physics HOTTA, Tomoaki (RCNP, Osaka University) on behalf of the LEPS&LEPS2 collaboration
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1 LCS2014 International Workshop LEPS Physics HOTTA, Tomoaki (RCNP, Osaka University) on behalf of the LEPS&LEPS2 collaboration
2 Outline Overview of the LEPS&LEPS2 beamlines Recent results from LEPS Search for K pp bound state Θ : new data and analysis Current status of LEPS2 Summary LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 2
3 Super Photon ring-8 GeV SPring-8 LEPS&LEPS2 8 GeV, 100 ma, e - storage ring Third-generation synchrotron radiation facility 2 of 62 beamlines are used for hadron physics LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 3
4 Laser-Electron SPring-8 Compton Scattering Compton Scattering BM1 BM2 CR2 E γ Tagging Tagging counter (SSD + Plastic Scint.) Backscattered photon LEP Laser UV or DUV Laser λ = 355 nm, 266 nm Compton scattering angle θ 2 determines the energy and polarization of the BCS photon. LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 4
5 Maximum BCS Photon energy SPring-8 λ = 266 nm (4.66 ev) E γ (GeV) SPring-8-2? 355 nm (3.49 ev) E e (GeV) 8 LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 5
6 Characteristics of LEPS (BCS) photon E e =8 GeV λ=351 nm LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 6
7 Properties of LEPS/LEPS2 beam 355 nm or 351 nm UV laser 2.4 GeV (max.) Intensity: 3x10 6 photons 266 nm or 257 nm Deep UV laser 2.9 GeV (max.) Intensity: 2x10 5 Tagged photon E γ > 1.5 LEPS and > 1.3 LEPS2, ~10 MeV resolution Laser: ~100% polarized Highly polarized γ beam. LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 7
8 What we can study Above φ(ss ) meson production threshold. Hyperon resonances. Nucleon resonances up to 2.3 GeV (2.5 GeV) with 2.4 GeV (2.9 GeV) photons. LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 8
9 LEPS Detector Setup Forward Spectrometer TOF : RF signal - TOF wall, t = ~150 ps Momentum : p ~ 6 MeV/c for 1 GeV/c K Acceptance : Hori ±20 o Vert ±10 o TPC 20 o < θ < 140 o P/P ~0.2 φ ~0.04 rad LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 9
10 γp p x Backward Meson Production Proton (Forward) : measured Meson (Backward): Missing mass Data ω/ρ Eγ = GeV cosθ cm = u-channel, s-channel N, N* contributions Fitting result η φ γp p π π γp p π π π γp p π π π π γp p π 0 /η/η /ω π 0 η Missing Mass 2 (GeV 2 /c 4 ) 10
11 Backward meson prod. η PRC80( 09) π 0 PLB 657:32( 07) Θ + pentaquark PRC79:025210( 09) PRL 91:012002( 03) φ photoproduction PRC82 ( 10) Proton target PRL95:182001( 05) Nuclear targets PLB608:215( 05) D target (coherent) PLB658:209( 08) D target (incoherent) PLB684 ( 10) 6 Results from LEPS Hyperon production Λ, Σ 0 (forward K + ) PRC73:035214( 06), PRL91:092001( 03) Σ (forward K + ) PRL 97:082003( 06) Λ(1520) PRL 103:012001( 09), PRL 104 ( 10) Σ (1385) PRL 102:012501( 09) Backward Λ PRC 76:042201( 07) Λ(1405), Σ 0 (1385) (with TPC) PRC 78:035202( 08)
12 Recent results from LEPS Forward spectrometer κ(888) exchange in γp K 0 Σ + reaction. Hwang et al., PRL108, (2012) K pp bound state search in γd K + π X reaction. Tokiyasu et al., PLB728(2014)616 Θ photoproduction (new data) Forward spectrometer + TPC Λ(1111) photoproduction at E γ = 3 GeV ω and η photoproduction at backward angles. arxiv: LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 12
13 K pp bound state strong K N attraction in I = 0 channel. Existence of Kaonic Nuclei is suggested. K NN is the lightest kaonic nuclei. K pp : strongest binding K NN system. Investigating sub-threshold K N interaction. Theoretical prediction, depending on models Binding Energy = 9 95 MeV, Width = MeV LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 13
14 Possible candidates FINUDA: Stopped K on nuclear targets PRL 94, (2005) B. E. = 111 (stat) syst Γ = 66 (stat) syst MeV Peak structure in pλ invariant mass LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 14
15 Possible candidates DISTO: pp pk + Λ reaction PRL 104, (2010) B. E. = 111 ± 3(stat) ± 5(syst) Γ = 111 ± 8 stat ± 10 syst MeV Peak structure in K + missing mass LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 15
16 Our search γd K + π X reaction E γ = GeV Tokiyasu et al., PLB 728(2014)616 Detecting K + and π at forward Low momentum transfer ( GeV/c) LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 16
17 Result Fitting with BG only Log-likelihood test if the fitting improved with K pp bound state signal No significant peak in M = GeV/c 2 (B.E. = MeV) γd K + π X missing mass Tokiyasu et al., PLB 728(2014)616 LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 17
18 Upper limit Γ (MeV) Upper Limit (µb) at 95% C.L. Hyperon production ~ 11µb Tokiyasu et al., PLB 728(2014)616 LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 18
19 Θ + (1111) pentaquark S = +1, Q = +1 Baryon minimal content: (uuuus ) Pentaquark Light and narrow (chiral quark soliton model) LEPS reported the first evidence in Width estimation by K + n Θ + reaction 0.36±0.11 MeV/c 2 (DIANA) < 0.64 MeV/c 2, upper limit (Belle) Its existence is still controversial. LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 19
20 Θ + (1111) search at LEPS detected γd K + K pp reaction Analysis: Fermi motion correction to obtain nk + mass Rejection of φ photoproduction Inclusive analysis: events from n/p not separated. Evidence with 5.1σ statistical significance was reported as PRC79, (2009) New data with higher statistics, same detector setup LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 20
21 Results of inclusive analysis New data 2.6 times more statistics than the previous data. Blind analysis: Cuts are pre-determined. Narrow strong structure is not seen in the signal region. The significance is less than 2σ, if we perform the same shape analysis as the previous analysis. Tomoaki Hotta (RCNP, Osaka) 21
22 Results of inclusive analysis New data v.s. previous data Normalized by entry In total, two data sets are consistent. χ 2 /ndf=56.4/66 KS-test 58.8% Fluctuation? Human bias? Over/under-estimation? Exclusive analysis LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 22
23 Exclusive analysis γ SIGNAL K - K + γ Background K - K + d p spectator n d n spectator p ( GeV/c) Quasi-free γn K Θ + γn φn K + K n Quasi-free γp K + Λ(1520) γp φp K + K p LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 23
24 Detection of recoil proton from BG Using de/dx information in start counter SC n QF γn event K + K - + or SC p K + K - QF γp event p: out of acceptance SC p K + K - QF γp event p: tagged Efficiency = ~ 60% LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 24
25 Detection of recoil proton from BG Using de/dx information in start counter QF γn event + QF γp event p: out of acceptance Signal enhancement is seen. QF γp event p: tagged Efficiency = ~ 60% LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 25
26 Setup of the current run Large Start Counter to improve proton tagging/rejection efficiency. Tomoaki Hotta (RCNP, Osaka) 26
27 LEPS2 experiments 2 nd LEPS beamline at SPring-8 Can be operated with LEPS at the same time. Aiming to obtain 10 7 /sec photon beam with improved laser injection system. Large acceptance detector in larger experimental hall BNL-E949 Solenoid LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 27
28 Current Status of LEPS2 Oct. 2013: Tagged photon beam became available. 2 experimental setups: BGOegg: egg-shaped BGO detector array. Dec. 2013: detector commissioning run started. Nov. 2014: data taking with a liquid H 2 target started. Solenoidal spectrometer (magnet from BNL- E949) Magnet is ready. Construction and development of the detectors are underway. LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 28
29 BGOegg detector Photon Beam 36 target BGO crystals covers deg. 1.3% energy resolution, 3.1mm position resolution for 1 GeV photon. Used with cylindrical drift chamber inside. TOF detector at forward angles. LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 29
30 Physics programs with BGOegg Search for η (958) mesic nucleus γn η 958 N elementary process with H 2 /D 2 target Cross section, beam asymmetry etc. Photoproduction of ω 782 and ω mesic nucleus. LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 30
31 LEPS2 solenoidal spectrometer 2.22 m γ counter RPC TOP γ Magnet from BNL-E949 TPC DC Detector construction is underway. LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 31
32 Θ + (1111) search at LEPS2 pk s invariant mass K 0 missing mass Without Fermi-motion correction, φ background. Overwrap with CLAS acceptance LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 32
33 Summary LEPS and LEPS2 are now in operation at SPring-8. Recent results for K pp bound state and Θ + pentaquark have been presented. BGOegg experiment at LEPS2 has been started. Costruction of LEPS2 solenoidal spectormeter is underway. LCS2014@Saskatoon Tomoaki Hotta (RCNP, Osaka) 33
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