16 March 2009 EuNPC, Bochum 0 Kaon Photoproduction Results from CLAS D. G. Ireland.
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Transcript of 16 March 2009 EuNPC, Bochum 0 Kaon Photoproduction Results from CLAS D. G. Ireland.
![Page 1: 16 March 2009 EuNPC, Bochum 0 Kaon Photoproduction Results from CLAS D. G. Ireland.](https://reader036.fdocument.pub/reader036/viewer/2022062511/551b3316550346dd1a8b4f4b/html5/thumbnails/1.jpg)
16 March 2009 EuNPC, Bochum 1
Kaon Photoproduction Results from CLAS
D. G. Ireland
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2
“Missing” Baryon Resonances
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3
Resonance Hunting…
Mostly done with N scattering or photoproductionMissing resonances may decay through other channels
Total Cross-sections+ differential cross-sections+ Partial Wave Analysis + ...
0.5 1.0 1.5
Cro
ss s
ecti
on
E (GeV)
P33
N(1440)P11
N(1520)D13
N(1535)S11
(1600)P33
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4
Meson Photoproduction Cross Sections
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5
Evidence for new resonance?
With D13
Without D13
Mart & Benhold, Phys. Rev. C 61 012201(R) (1999)
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Transversity Amplitudes
b1 = 1/2[(S1 + S2) + i(N - D)] p
K }} p
K }} p
K }} p
K }}
b2 = 1/2[(S1 + S2) - i(N - D)]
b3 = 1/2[(S1 - S2) - i(N + D)]
b4 = 1/2[(S1 - S2) + i(N + D)]
N, S1,S2, D: Helicity Amplitudes
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7
Experimental Observables
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8
p →K Reaction Kinematics
proton
zy
x
z
y
x
zy
x
p
. .c m
K
proton
K+
zzzz
yy
xxxx
CPOP
TPP
CPOP
Pd
d
cos2sincos
2coscoscos
cos2sincos
2cos10
Cross Section without target polarisationHyperon is self-analysing
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CEBAF at Jefferson Laboratory
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10
CLAS
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Tagged Photons at CLAS
• E = E0 – E’
• Circular Polarisation: polarised electron beam, amorphous radiator
• Linear polarisation: Crystal (diamond) radiator
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12
p →K Cross Section Measurements
R. Bradford et al., Phys. Rev. C 73, 035202 (2006).
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13
Recoil Polarisation
proton
zy
x
z
y
x
zy
x
p
. .c m
K
proton
K+
zzzz
yy
xxxx
CPOP
TPP
CPOP
Pd
d
cos2sincos
2coscoscos
cos2sincos
2cos10
Hyperon is self-analysing
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14
Recoil Polarisation (P) p→K
Guidal, Laget, VanderhaeghenGuidal, Laget, Vanderhaeghen
GENTGENT Kaon-MAIDKaon-MAID
J. McNabb J. McNabb et alet al. (CLAS) Phys. Rev. C . (CLAS) Phys. Rev. C 6969, 042201 (2004)., 042201 (2004).
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15
Beam-Recoil Double Polarisation (Cx’,Cz’)
proton
zy
x
z
y
x
zy
x
p
. .c m
K
proton
K+
zzzz
yy
xxxx
CPOP
TPP
CPOP
Pd
d
cos2sincos
2coscoscos
cos2sincos
2cos10
Hyperon is self-analysing
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Polarisation
2 2 2x zR P C C
→ fully polarised
R. Bradford et al., Phys. Rev. C 75, 035205 (2007).
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17
Photon Beam Asymmetry ()
proton
zy
x
z
y
x
zy
x
p
. .c m
K
proton
K+
zzzz
yy
xxxx
CPOP
TPP
CPOP
Pd
d
cos2sincos
2coscoscos
cos2sincos
2cos10
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18
Linear Polarisation analysis
Photon Linear Polarisation Particle ID
Thesis work of Craig Paterson (Glasgow)
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p →K Photon Beam Asymmetry
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p →K Photon Beam Asymmetry
PREL
IMIN
ARY
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p →K Photon Beam Asymmetry
PREL
IMIN
ARY
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22
Beam-Recoil Double Polarisation (x,Oz)
proton
zy
x
z
y
x
zy
x
p
. .c m
K
proton
K+
zzzz
yy
xxxx
CPOP
TPP
CPOP
Pd
d
cos2sincos
2coscoscos
cos2sincos
2cos10
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23
p →K Extracting Ox and Oz
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24
p →K Beam-Recoil Ox and Oz
O x
PREL
IMIN
ARY
O z
PREL
IMIN
ARY
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25
Experimental Observables
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26
Outlook – Deuterium Target
• Data taking completed
• Currently being analysed
• Data on quasifree neutron and proton
• Circular and Linear Polarisation
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27
Outlook – FROzen Spin Target (FROST)
Target can be longitudinally or transversely polarised
• “Complete” measurement possible• First part of run complete• Undergoing calibration• Second period to run soon…
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28
Conclusions
Kaon Photoproduction results from CLAS:
• Published results: , P, Cx, Cz
• Preliminary results: , T, Ox, Oz
In the near future:
• Same set of results for 2H target (quasifree neutron and proton)
• “Complete” results (FROST)
Next few years:
• Complete set on 2H and p (HDIce)
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29
Backup Slides…
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Resonances in Quark Models
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31
Kaon Photoproduction
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32
Contributing Processes
+ channel coupling…
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33
Helicity Amplitudes
N No overall helicity flip = |–p |
p
K }}S1 Single helicity flip
p
K }}S2 Single helicity flip
p
K }}D Double helicity flip
p
K }}
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34
Cross Section Measurements
R. Bradford et al., Phys. Rev. C 73, 035202 (2006).
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35
Cross Section Measurements
R. Bradford et al., Phys. Rev. C 73, 035202 (2006).
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36
Cross Section Measurements
R. Bradford et al., Phys. Rev. C 73, 035202 (2006).
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37
Beam-Recoil Double Polarisation Cz
R. Bradford et al., Phys. Rev. C 75, 035205 (2007).
Saclay, Argonne, PittsburghSaclay, Argonne, Pittsburgh
Bonn, Giessen, GatchinaBonn, Giessen, GatchinaKaon-MAIDKaon-MAID
Regge+ResonanceRegge+Resonance GENTGENT
Shklyar Shklyar Lenske Lenske MoselMosel
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Beam-Recoil Double Polarisation Cx
GENTGENT
Saclay, Argonne, PittsburghSaclay, Argonne, Pittsburgh
Bonn, Giessen, GatchinaBonn, Giessen, Gatchina
Kaon-MAIDKaon-MAID
Regge+ResonanceRegge+Resonance
Shklyar Lenske Shklyar Lenske MoselMosel
R. Bradford et al., Phys. Rev. C 75, 035205 (2007).
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39
Photon Beam Asymmetry
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Photon Beam Asymmetry
PREL
IMIN
ARY
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41
Photon Beam Asymmetry
PREL
IMIN
ARY
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42
Recoil - Comparison
g8b
Prev CLAS
GRAAL
~Factor of 4 increase in statistics from best previous measurements
PREL
IMIN
ARY