meson physics with crystal ball at mami · 2018. 9. 21. · meson physics with crystal ball at mami...
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![Page 1: Meson Physics with Crystal Ball at MAMI · 2018. 9. 21. · Meson Physics with Crystal Ball at MAMI Marc Unverzagt Institute for Nuclear Physics University Mainz Prague, 17th June](https://reader033.vdocuments.us/reader033/viewer/2022053123/60ac90ed61827f42752fab63/html5/thumbnails/1.jpg)
Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Meson Physics with Crystal Ball at MAMI
Marc UnverzagtInstitute for Nuclear Physics
University MainzPrague, 17th June 2013
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Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Outline
Crystal Ball Set-up at MAMI
' Cross Sections
Transition Form Factor from →e+e- Revisited
T and F Asymmetry in Photoproduction
Summary
![Page 3: Meson Physics with Crystal Ball at MAMI · 2018. 9. 21. · Meson Physics with Crystal Ball at MAMI Marc Unverzagt Institute for Nuclear Physics University Mainz Prague, 17th June](https://reader033.vdocuments.us/reader033/viewer/2022053123/60ac90ed61827f42752fab63/html5/thumbnails/3.jpg)
Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Outline
Crystal Ball Set-up at MAMI
' Cross Sections
Transition Form Factor from →e+e- Revisited
T and F Asymmetry in Photoproduction
Summary
![Page 4: Meson Physics with Crystal Ball at MAMI · 2018. 9. 21. · Meson Physics with Crystal Ball at MAMI Marc Unverzagt Institute for Nuclear Physics University Mainz Prague, 17th June](https://reader033.vdocuments.us/reader033/viewer/2022053123/60ac90ed61827f42752fab63/html5/thumbnails/4.jpg)
Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Mainz Microtron
Ee-<1604 MeV E<0.1 MeV
High current (110A) High polarisation (85%) Duty factor 100% ~7000 h/year running experiments
ME
SA
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Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Experiments at MAMIA2: Real Photon Experiments:- Glasgow tagging spectrometer- Crystal Ball / TAPS hermetic photon spectrometer- Meson Factory
A1: Electron Scattering:- focusing magnetic spectrometers- neutron detection, spin precession- Kaon spectrometer (KAOS/A1)
ME
SA
PRISMA/SFB 1044:- Dark Photon Search- El.-weak Mixing Angle
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Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Real Photons in A2
High energy resolution: E≈2MeV at E
e-=883 MeV
E≈4MeV at E
e-=1558 MeV
Linearly and circularly polarised photon-beamTagging range: 5.1 to 93% of E
→ Maximum energy tagged for E=1604 MeV is 1491 MeV
E=E
0-E
e- Ethr ≈ 1447 MeV
Data form CB@MAMI, CB@ELSA, CLAS, SAPHIR
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Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
End-Point-Tagger● Installation of EPT during 2012
Same working principle as main tagging spectrometerE≈1445-1595 MeV
E≈ 2.5MeV
Non-permanent installation infront of main Tagger
EPT
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Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
4-Setup
Crystal Ball: 672 NaI(Tl) crystals 93,3% of total solid angle Each crystal equipped with PMT
E
=2 %
E /GeV 0.25
t = 2.5 ns FWHM
=2 3
=2 3
sin
TAPS: Up to 510 BaF
2 crystals
Polar acceptance: 4-20°
t = 0.5 ns FWHM
E
=0,79 %
E /GeV1,8%
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Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Targets● LH2/lD2 used for high rate meson production (/')
- Length: 3cm, 5cm, 10cm
● l3He/l4He
● Polarised Butanol/D-Butanol- Transverse and longitudinal polarisation- Lenght: 2 cm- Dynamic Nuclean Polarisation- Max. Polarisation: 90%- Holding filed: 0.44 T - Relaxation time: ~1000h
● Solid Targets
![Page 10: Meson Physics with Crystal Ball at MAMI · 2018. 9. 21. · Meson Physics with Crystal Ball at MAMI Marc Unverzagt Institute for Nuclear Physics University Mainz Prague, 17th June](https://reader033.vdocuments.us/reader033/viewer/2022053123/60ac90ed61827f42752fab63/html5/thumbnails/10.jpg)
Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Outline
Crystal Ball Set-up at MAMI
' Cross Sections
Transition Form Factor from →e+e- Revisited
T and F Asymmetry in Photoproduction
Summary
![Page 11: Meson Physics with Crystal Ball at MAMI · 2018. 9. 21. · Meson Physics with Crystal Ball at MAMI Marc Unverzagt Institute for Nuclear Physics University Mainz Prague, 17th June](https://reader033.vdocuments.us/reader033/viewer/2022053123/60ac90ed61827f42752fab63/html5/thumbnails/11.jpg)
Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
'→00 Invariant Mass
S. Prakhov (UCLA)P. Ott (Mainz)
E=1430±10 MeV E=1450±10 MeV E=1470±10 MeV
E=1490±10 MeV
E=1550±10 MeV
Prelim
inar
y
E=1510±10 MeV
E=1570±10 MeV
E=1530±10 MeV
Prelim
inar
y
Prelim
inar
y
Prelim
inar
y
Prelim
inar
y
Prelim
inar
y
Prelim
inar
y
Prelim
inar
y
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Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
' Cross Section
S. Prakhov (UCLA)P. Ott (Mainz)
tot
Prelim
inary
E=1450±10 MeV E=1470±10 MeV E=1490±10 MeV E=1510±10 MeV
E=1530±10 MeV E=1550±10 MeV E=1570±10 MeV
Using '→00
Preliminary Preliminary
Preliminary
Preliminary Preliminary
Preliminary Preliminary
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Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
' Programme
Status now:● EPT successfully in operation● Preliminary result for photoproduction cross section near threshold● Preliminary result for '→00 Dalitz plot (limited statistics)● MC background studies for '→e+e- and first glance at data
DAQ Improvement:● New trigger system (FPGA based)● Faster DAQ PCs
→ Factor of 2 in speed gained● Sep. 2013: Further DAQ upgrade
→ Additional factor of 2 in speed ?
Next ' Production:● EPT installation in beam in summer/fall 2014● Beamtime estimate underway● Measure with x4 speed and longer period● Goal: 400,000 '→00 (Dalitz plot analysis)
~200-300 '→e+e- (Transition Form Factor)
A. Denig, M. Ostrick, P. Ott, S. Prakhov, M. Unverzagt, S. Wagner
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Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Outline
Crystal Ball Set-up at MAMI
' Cross Sections
Transition Form Factor from →e+e- Revisited
T and F Asymmetry in Photoproduction
Summary
![Page 15: Meson Physics with Crystal Ball at MAMI · 2018. 9. 21. · Meson Physics with Crystal Ball at MAMI Marc Unverzagt Institute for Nuclear Physics University Mainz Prague, 17th June](https://reader033.vdocuments.us/reader033/viewer/2022053123/60ac90ed61827f42752fab63/html5/thumbnails/15.jpg)
Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Previous Analysis of TFFH. Berghäuser et al. (A2-Collaboration), Phys. Rev. B 701 (2011) 562-567.
● Based on kinematic cuts● Small amount of data● Limited photoproduction energy range
-2 = (1.92±0.35stat±0.13syst) GeV-2
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Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
New Analysis of TFF
● Based on kinematic fitting● 3x more data● Full photoproduction range accessible at MAMI used● 18,000 events (no proton requirement: 22,000 events)
m(e+e-)=45±5 MeV m(e+e-)=285±5 MeVSolid line: Pole-approximation fitNormalisation and as free parameters
PreliminaryPreliminary Preliminary
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Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
New Result on TFFS. Prakhov, M. Unverzagt et al., to be submitted to Phys. Rev. soon
-2 = (1.95±0.15stat±0.05syst) GeV-2 preliminary
A2, 2011: H. Berghäuser et al., Phys. Rev. B 701 (2011) 562-567.NA60, In-In: R. Arnaldi et al., Phys. Lett. B 677 (2009) 260.TL calculation: C. Terschlüsen, Diploma thesis, University Gießen, 2010.Padé-approximants: R. Escribano, P. Masjuan, P. Sanchez-Puertas, in preparation.
Preliminary
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Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Outline
Crystal Ball Set-up at MAMI
' Cross Sections
Transition Form Factor from →e+e- Revisited
T and F Asymmetry in Photoproduction
Summary
![Page 19: Meson Physics with Crystal Ball at MAMI · 2018. 9. 21. · Meson Physics with Crystal Ball at MAMI Marc Unverzagt Institute for Nuclear Physics University Mainz Prague, 17th June](https://reader033.vdocuments.us/reader033/viewer/2022053123/60ac90ed61827f42752fab63/html5/thumbnails/19.jpg)
Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Polarisation Observables T and F
● Disentangle Multipoles (complete experiment), perform PWAs● s-d wave interference in T for , isobar models predict zero interference
● Double polarisation observable F not measured yet
Dominated by Born, , Dominated by D13(1520)
Dominated by S11(1535)
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Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Transverse Target Asymmetry T for
Prelim
inary
Black line: MAID-2003, isobar modelBlue line: MAID-2003, reggeized isobar modelRed line: BG2010-02Green line: SAID
Red points: CB 2010/11Balck points: PHOENICSBock et al., Phys. Rev. Lett. 81, 534 (1998)
Victor Kashevarov(Mainz)
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Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Double Polarisation Observable F for
Prelim
inary
Black line: MAID-2003, isobar modelBlue line: MAID-2003, reggeized isobar modelRed line: BG2010-02
First time measurement with Crystal Ball!
Victor Kashevarov (Mainz)
![Page 22: Meson Physics with Crystal Ball at MAMI · 2018. 9. 21. · Meson Physics with Crystal Ball at MAMI Marc Unverzagt Institute for Nuclear Physics University Mainz Prague, 17th June](https://reader033.vdocuments.us/reader033/viewer/2022053123/60ac90ed61827f42752fab63/html5/thumbnails/22.jpg)
Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Outline
Crystal Ball Set-up at MAMI
' Cross Sections
Transition Form Factor from →e+e- Revisited
T and F Asymmetry in Photoproduction
Summary
![Page 23: Meson Physics with Crystal Ball at MAMI · 2018. 9. 21. · Meson Physics with Crystal Ball at MAMI Marc Unverzagt Institute for Nuclear Physics University Mainz Prague, 17th June](https://reader033.vdocuments.us/reader033/viewer/2022053123/60ac90ed61827f42752fab63/html5/thumbnails/23.jpg)
Marc Unverzagt Prague, 17th June 2013MesonNet Workshop
Summary
● ' production at MAMI possible now- Preliminary results on ' photoproduction cross section- First glances on '→00 Dalitz plot and ' Transition Form Factor
● New determination of the Transition Form Factor in →e+e-- More than one order of magnitude more than previous A2 analysis- Soon to be published
● Polarisation observables with Crystal Ball- Precise determintation of Target Asymmetry T (preliminary)- First determination of Double Polarisation Observable F (preliminary)
● 12 years physics programme funded through DFG (SFB 1044)- Broad physics programme including
Light Meson DynamicsTransition Form Factors of pseudoscalar MesonsPolarisation Observables (long. and trans. Pol. target)