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