PAC MeetingProposal A2-7/05
Mainz, 29th September 2005Andreas Thomas
Helicity Dependence of Meson Photoproduction on the Proton
650h approved with A
Technical concept:
Tagged CW photon beam 4- detector
Frozen spin target (30mKelvin, 0.4Tesla)
sec107
Horizontal Dilution refrigerator
Beam along cryostat axis
symmetric,
Thin internal holding coil on shield (longitudinal,transverse)
Loading along cryostat axis
The new Frozen Spin Target for Crystal Ball
Similar to Bonn Target [C.Bradtke et al., NIM A436, 430 (1999)]
2) More detailed information on resonance propertiesand multipole amplitudes
by investigating the helicity structure of
partial reaction channels
2) More detailed information on resonance propertiesand multipole amplitudes
by investigating the helicity structure of
partial reaction channels
GDH-physics on the proton
1) Test of the GDH sum rule
Circularly polarized photons on longitudinally polarized protons
E (GeV) IGDH (mb)
0.14-0.20 MAID03SAID04
-29 -28
0.20-2.90 Measured (Mainz+Bonn)
254±5±12
> 2.90 (Regge approach)
Simula et al.Bianchi-Thomas
~ -13 ~ -14
Total ~ 212
GDH sum rule 205
GDH sum rule on the proton
D.Drechsel et al.Phys. Rev. D 63, 114010 (2001)Gerasimov-Drell-Hearn sum rule and related integrals
bI theosyststatGDHp 12155205
GDH sum rule verified for the proton
Emax=430MeV
LEGS, A.Sandorfi, PWA BadHonnef:Good aggreement in measured range,But Problem: 0 extrapolation inForward direction ??
2) More detailed information on resonance propertiesand multipole amplitudes
by investigating the helicity structure of
partial reaction channels
2) More detailed information on resonance propertiesand multipole amplitudes
by investigating the helicity structure of
partial reaction channels
status of present results and future goals:
single - production (D13 (1520), F15 (1680))
- production (F15 (1680), P11 (1710))
double - production (D13 (1520), P11 (1440), P11 (1710))
Helicity Dependence of Meson Photoproduction
Partial reaction channelsInput for PWA to extract resonance parameters
Measurements in 1998 and 2003 at MAMIwith DAPHNEand Bonn PT
Quark ModelClassification of Baryonsqqq; only uds
Oktett Dekuplett
Simple Constituent quark picture:
Proton p(938): |uud> ~ |> Spin 1/2Delta (1232): |uud> ~ |> Spin 3/2
M1-Transition(Small 2.5% E2)
Connection between and andMultipoles and Resonances
21 2
3
1 lL
21
23
............2*
221
11*
110
}Re{6
}Re{638
22
222
MEEM
MMEEE
kq
Photon Photon Total Pion Multipole Resonance ContributionL Multipole J P l Amplitude to
1 E1 1/2 - 0 E0+ S11 -
3/2 - 2 E2- D13 +
M1 1/2 + 1 M1- P11 -
3/2 + 1 M1+ P33 +
2 E2 3/2 + 1 E1+ P33 -
5/2 + 3 E3- F15 +
M2 3/2 - 2 M2- D13 -
5/2 - 2 M2+ D15 +
N N
l
JIl 2,2
-prod.Ratio
p p
E[MeV]
b]
MAID2000
[Phys. Rev. Lett. 84, 5950 (2000)]
200 300 400 500
0
50
100
150
200
250
300
350 -2.5% 0% +2.5% GDH98
p n
E[MeV]200 300 400 500
-150
-100
-50
0
50
100
150
200
-2.5% 0% +2.5% GDH98
Connection between and andMultipoles and Resonances
21 2
3
1 lL
21
23
............2*
221
11*
110
}Re{6
}Re{638
22
222
MEEM
MMEEE
kq
Photon Photon Total Pion Multipole Resonance ContributionL Multipole J P l Amplitude to
1 E1 1/2 - 0 E0+ S11 -
3/2 - 2 E2- D13 +
M1 1/2 + 1 M1- P11 -
3/2 + 1 M1+ P33 +
2 E2 3/2 + 1 E1+ P33 -
5/2 + 3 E3- F15 +
M2 3/2 - 2 M2- D13 -
5/2 - 2 M2+ D15 +
N N
l
JIl 2,2
Resonanz D13(1520)
MAID2003
Photoproduction
DSG E
MAID2003
Dominated by S11(1535) at low photon energy E=1 calibration PBPT
Photoproduction MAID2003
DSG E
PhotoproductionDSG E
KAON-MAID
e.g. Missing resonance D13(1900)
900 1000 1100 1200 1300 1400 15000.0
0.2
0.4
0.6
0.8
1.0
E
EG_lab (MeV)
full no D13
900 1000 1100 1200 1300 1400 1500
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
D
SG
(m
ub/s
r)
EG_lab (MeV)
DSG
900 1000 1100 1200 1300 1400 1500-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0.0
full no D13
G
EG_lab (MeV)
2 0 Photoproduction
Physics Letters B 624 (2005) 173-180Hirata et al., Phys. Rev. C 67, 034601 (2003)Nacher et al., Nucl. Phys. A 697, 372 (2002)
Improve, extend to higher energies, angular distributions and invariant masses for and
Emin=700MeV
Emin~400MeV
E0=1200MeV
Bonn
[R.Beck]
Experimental equipment
Standard CB-TAPS (mini-TAPS) Cerenkov-detector
Polarized frozen-spin target
under preparation (P.Pedroni, P. Bartolomez)
Upgraded Tagger with Moeller Polarimeter
Beam time estimate
Reactions:
bpp
srbpp
srbpp
7
/2.0
/5.1
00
0
Helicity asymmetry:
measEP
E
= dilution, Background,P= PPT
Required beam time:
1
22
1 unpol
avTstat
nNEP
t
Polarization:
42.07.06.0 TPPP
Efficiency (detection and reconstruction)
7.0av
Goal: 05.0statE
Target:222 /108.0 cmnT in 2 cm butanol
(includ. dilution and filling factors)
135.074
10f dilution factor
4.1144.71
Cf
background from butanoland walls, He
Beam:
Data acquisition capability: 1000 events/s
btothadr 150 (800 to 1400 MeV)
sN /101.1 7 in
MeV
)20(/106.3 5 MeVsN
Beam time estimate
05.0)/5.1(0 statunpol Eandsrbppfor
1
22)(
1 unpol
avTstat
nfNEP
t
t = 250 h (800 -1400 MeV) 250 h (500 - 800 MeV) 150 h (200 – 500 MeV) 100 h target polarization, flux, Moeller, etc.
800 h total (polarized)
In addition about 200 h with liq. Hydrogen (in combination with other measurements)
For and reduced binning and stat. accuracy %)10,20( statEMeVE
Summary
• helicity observables carry valuable information on resonance properties
and reaction mechanisms
Main goal:single 0 - production (D13 (1520), F15 (1680))
- production (F15 (1680), P11 (1710))
double 0 - production (D13 (1520), P11 (1440), P11 (1710))
In addition: charged - production
Hyperon Photoproduction
p K+ + p + - (~ 64%)
n + 0 (~ 36%)
p K+ +
• Important for investigations of nucleon resonances
• A crucial test of QCD based chiral perturbation theories in the strange quark sector
T C Jude, The University of Edinburgh, Strangeness Photoproduction A2 Collaboration meeting, Mainz, September 2008
Threshold Energy ~ 911 MeV
Threshold Energy ~ 1046 MeV
Identifying strange mesons
K+ (~ 63%) Mean lifetime of K+ ~ 12 ns
(~ 21%)
First cluster from K+ < 3ns
Secondary cluster from K+ decay > 10ns
• A new method of tagging a strange meson reaction channel• Identify the K+ decay within the crystals of the Crystal Ball
T C Jude, The University of Edinburgh, Strangeness Photoproduction A2 Collaboration meeting, Mainz, September 2008
J.Brudvik, J.Goetz, B.M.K.Nefkens, S.N.Prakhov, A.Starostin, and I.Suarez, University of California, Los Angeles, CA, USA
P.Aguar, J.Ahrens, H.J.Arends, D.Drechsel, E.Heid, O.Jahn, D.Krambrich, M.Martinez, M.Rost, S.Scherer, A.Thomas, L.Tiator, D. von Harrach and Th.Walcher, Institut für Kernphysik, University of Mainz, Germany
R.Beck, M.Lang, A.Nikolaev, S.Schumann, and M.Unverzagt, Helmholtz--Institut für Strahlen- und Kernphysik, Universität Bonn, Germany
S.Altieri, A.Braghieri, A.Panzeri, P.Pedroni, T.Pinelli, and T.Rostomyan, INFN Sezione di Pavia, Pavia, Italy
J.R.M.Annand, R.Codling, E.Downie, D.Glazier, J.Kellie, K.Livingston, J.C.McGeorge, I.J.D.MacGregor, R.O.Owens, D.Protopopescu, G.Rosner, Department of Physics and Astronomy, University of Glasgow, Glasgow, UK
C.Bennhold, W.Briscoe, H.Haberzettl, Y.Ilieve, A.Kudryavtsev, and I.Strakovsky, George Washington University, Washington, USA
S.N.Cherepnya, L.V.Fil'kov, and V.L.Kashevarov , B.N. Lebedev Physical Institute, Moscow, Russia
V.Bekrenev, S.Kruglov, A.Kulbardis, and N.Kozlenko, Petersburg Nuclear Physics Institute, Gatchina, Russia
B.Boillat, C.Carasco, B.Krusche, F.Pheron, and F.Zehr, Institut für Physik University of Basel, Basel, Ch
P.Drexler, F.Hjelm, M.Kotulla, K.Makonyi, V.Metag, R.Novotny, M.Thiel, and D.Trnka, II. Physikalisches Institut, University of Giessen, Germany
D.Branford, K.Foehl, C.M.Tarbert and D.P.Watts, School of Physics, University of Edinburgh, Edinburgh, UK
G.M.Gurevich, V.Lisin, R.Kondratiev and A.Polonski, Institute for Nuclear Research, Moscow, Russia
J.W.Price, California State University, Dominguez Hills, Carson, CA, USA
D.Hornidge, Mount Allison University, Sackville, NB, Canada
P.Grabmayr and T.Hehl, Physikalisches Institut, Universität Tübingen, Tübingen, Germany
N.S.Borisov, S.B.Gerasimov, and Yu.A.Usov, JINR, Dubna, Russia
H.Staudenmaier, Universität Karlsruhe, Karlsruhe, Germany
D.M.Manley, K.Bantawa, Kent State University, Kent, USA
A.Knezevic, M.Korolija, M. Mekterovic and I.Supek, Rudjer Boskovic Institute, Zagreb, Croatia
D.Sober, Catholic University, Washington DC
M.Vanderhaeghen, College of Williams and Mary, Williamsburg, USA
The CB/TAPS@MAMI collaboration
The GDH collaborationJ.Ahrens9,S.Altieri15,16,J.R.M.Annand6,G.Anton3,H.-J.Arends9,K.Aulenbacher9,R.Beck9, C.Bradtke1,A.Braghieri15,N.Degrande4, N.d'Hose5, H.Dutz2, S.Goertz1, P.Grabmayr17, K.Hansen8, J.Harmsen1, S.Hasegawa13,T.Hasegawa11, E.Heid9, K.Helbing3, H.Holvoet4, L.VanHoorebeke4, N.Horikawa14,T.Iwata13, P.Jennewein9, T.Kageya14, B.Kiel2,F.Klein2, R.Kondratiev12,K.Kossert7,J.Krimmer17,M.Lang9,B.Lannoy4,R.Leukel9,V.Lisin12,T.Matsuda11,J.C.McGeorge6,A.Meier1,D.Menze2,W.Meyer1,T.Michel3,J.Naumann3, A.Panzeri15,16, P.Pedroni15,T.Pinelli15,16,I.Preobrajenski9,12,E.Radtke1,E.Reichert10,G.Reicherz1,Ch.Rohlof2, G.Rosner6, D.Ryckbosch4,F.Sadiq6,M.Sauer17,B.Schoch2, M.Schumacher7, B.Seitz7, T.Speckner3,M.Steigerwald9, N.Takabayashi13, G.Tamas9, A.Thomas9, R.van de Vyver4, A.Wakai14, W.Weihofen7, F.Wissmann7, F.Zapadtka7, G.Zeitler3
1Institute of Experimental Physics, Ruhr-University, Bochum, Germany 2 Physics Institute, University of Bonn, Germany 3 Physics Institute, University of Erlangen-Nuernberg, Erlangen, Germany 4 Nuclear Physics Laboratory, Gent, Belgium 5 CEA Saclay, DSM/DAPNIA/SPhN, Gif-sur-Yvette, France 6 Department of Physics & Astronomy, University of Glasgow, U.K. 7 II.Physics Institute, University of Goettingen, Germany 8 Department of Physics, University of Lund, Sweden 9,10 Institute of Nucl. Physics and Inst. of Physics, University of Mainz, Germany 11 Faculty of Engineering, Miyazaki University, Miyazaki, Japan 12 INR, Academy of Science, Moscow, Russia 13,14 Department of Physics and CIRSE, Nagoya University, Nagoya, Japan 15,16 INFN Sezione di Pavia and Dept. of Nucl. Physics of the University , Pavia, Italy 17 Physics Institute, University of Tuebingen, Germany
A. Fix and H. Arenhövel, MKPH-T-05-1
Photoproduction
DSG E
MAID2003
Assafiri et al., PRL 90 (2003) 222001
A2 Time-Schedule for parallel running in the years 2006-2007-12/2005 Tagger upgrade, Magnet installation01/2006 Calibration and commissioning Tagger, test goniometer04/2006 Detector tests with H2-Target and Crystal Ball
04/2006 Experiments with unpolarized Targets: total: 3805hMAMI B A2-7/03 3He 885MeV mesic nuclei 300h
MAMI C A2-2/05 H2 1500MeV rare -decay 950h
MAMI C A2-4/05 H2 1500MeV Magnetic moment S11 (550h)*
MAMI C A2-1/05 H2 1500MeV in medium (100h)*
MAMI B A2-5/05 H2 885MeV Recoil (400h)*
MAMI C A2-5/05 H2 1500MeV Recoil (500h)*
MAMI C A2-3/05 H2 1500MeV rare ´-decay 700h
MAMI C A2-4/05 D2 1500MeV Magnetic moment S11 550h
MAMI C A2-10/05 D2 1500MeV -Prod. (200h)*
MAMI C A2-1/05 D2 1500MeV in medium (100h)*
MAMI C A2-11/05 D2 1500MeV dd (350h)*
MAMI C A2-6/05 16O, C 1500MeV Asym. 2 proton 205h
MAMI C A2-1/05 12C 1500MeV in medium 100hMAMI C A2-1/05 natCa 1500MeV in medium 100hMAMI C A2-1/05 93Nb 1500MeV in medium 400hMAMI C A2-1/05 natPb 1500MeV in medium 500h
05/2007 2 month for installation frozen spin target, CB on rails 07/2007 Experiments with polarized Targets: total: 885h in 2007
MAMI B A2-7/05 H-But. 885MeV GDH proton 250h
MAMI C A2-7/05 H-But. 1500MeV GDH proton (250h)*
MAMI C A2-8/05 H-But. 1500MeV G-Asymmetry 635h 2008MAMI B A2-9/05 D-But. 885MeV GDH neutron 350h
MAMI C A2-9/05 D-But. 1500MeV GDH neutron (450h)*
MAMI C A2-10/05 D-But. 1500MeV E-Observ.-Prod. 700h MAMI C A2-11/05 D-But. 1500MeV ,G,E-Observ., 600hMAMI C A2-12/05 D-But. 1500MeV Transvers. PT Coherent 0 1200h
( )* Experiments in frames can be done parallel