Meson Spectroscopy at CLAS
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Transcript of Meson Spectroscopy at CLAS
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Meson Spectroscopy at CLAS
D.P. WeygandCLAS Collaboration
Thomas Jefferson National Accelerator Facility
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GLUE88/BNL
I have been using the constituent quark model for many years now as a tool for understanding the spectrum and properties of the low-lying mesons and baryons. For most of this time I have been painfully aware of the difficulty of understanding from first principles (i.e., from QCD) why such a model should work. I have nevertheless had faith that we would eventually be able to justify the use of this model simply because it is such a good representation of the physics.
At the same time, the picture I will propose to rationalize the success of the quark model (which is related to the old string model) leads inevitably to a model for states beyond the quark model: hybrids, glueballs, and multiquark states.
Nathan Isgur, b. 1947, d. 2001
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photoproduction
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Partial Wave Analysis
isobar
X
Likelihood function:
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CLAS g12 run
CLAS g12 runEe = 5.715 GeVI = 65 nAEg = 3.58-5.45 GeV26.2 X 109 triggersL = 68 pb-1
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Raw ppp mass spectra
C. Bookwalter thesis
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Baryon background
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COMPASS
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a1(1260)/a2(1320)/p2(1670)
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p1(1600) phase
E852/1998
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p0 sidebands
GeV/c2
ppp masssideband subtracted ppp mass
GeV/c2
GeV/c2
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E852 1997
D. Schott Thesis
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PWA
P M=1
D M=1
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a2(1320) Breit-Wigner
mass = 1.32± 0.01 GeV
= 0.14G ± 0.01 GeV
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M. Saini Thesis
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Strangeonium
JPC Mass (MeV)
1-- 102318191862
2-- 19793-- 21231+- 1489
LQCD: Hadron Spectrum Collaboration
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Xeon Phi
PWA fitting program currently being developed on Xeon Phi MIC
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Summary
• CLAS-g12: High luminosity, high energy data set (5.5 GeV/c, 68 pb-1)
• ~106 exclusive g p n p+p+p- events• PWA from 1 to 2 GeV• Clear signals for a1(1260), a2(1320) and p2(1670) • No evidence for p1(1600) exotic (neither intensity nor phase)
• Consistent with previous CLAS result• Consistent with Pomeron exchange
• Search for exotic p1(1400) in - ( hp p exchange)• Clear signal for a2(1320)• No evidence for p1(1400)
• Strangeonium ( f h)• No significant resonant structures
• Prospects• Neutral p+p-p0
• KsKs
• K+K-
Collaborative (Jlab,GWU) Effort to Include Baryon Resonances in PWA
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Other Slides
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p1(1600) phase
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p1(1600) phase
E852/1998
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Jackson Frame Angles
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