Thomas Jefferson National Accelerator Facility Page 1 Meson Spectroscopy at CLAS D.P. Weygand CLAS Collaboration Thomas Jefferson National Accelerator.

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Presentation transcript:

Thomas Jefferson National Accelerator Facility Page 1 Meson Spectroscopy at CLAS D.P. Weygand CLAS Collaboration Thomas Jefferson National Accelerator Facility

Thomas Jefferson National Accelerator Facility Page 2 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

Thomas Jefferson National Accelerator Facility Page 3 photoproduction

Thomas Jefferson National Accelerator Facility Page 4 Partial Wave Analysis isobar X Likelihood function:

Thomas Jefferson National Accelerator Facility Page 5 CLAS g 12 run E e = GeV I = 65 nA E  = GeV 26.2 X 10 9 triggers L = 68 pb -1

Thomas Jefferson National Accelerator Facility Page 6

Thomas Jefferson National Accelerator Facility Page 7 Raw  mass spectra C. Bookwalter thesis

Thomas Jefferson National Accelerator Facility Page 8 Baryon background

Thomas Jefferson National Accelerator Facility Page 9 COMPASS

Thomas Jefferson National Accelerator Facility Page 10 a 1 (1260)/a 2 (1320)/  2 (1670)

Thomas Jefferson National Accelerator Facility Page 11

Thomas Jefferson National Accelerator Facility Page 12  1 (1600) phase E852/1998

Thomas Jefferson National Accelerator Facility Page 13   sidebands GeV/c 2  mass sideband subtracted  mass GeV/c 2

Thomas Jefferson National Accelerator Facility Page 14 E D. Schott Thesis

Thomas Jefferson National Accelerator Facility Page 15 PWA P M=1 D M=1

Thomas Jefferson National Accelerator Facility Page 16 a2(1320) Breit-Wigner mass = 1.32± 0.01 GeV  ± 0.01 GeV

Thomas Jefferson National Accelerator Facility Page 17 M. Saini Thesis

Thomas Jefferson National Accelerator Facility Page 18

Thomas Jefferson National Accelerator Facility Page 19 Strangeonium J PC Mass (MeV) LQCD: Hadron Spectrum Collaboration

Thomas Jefferson National Accelerator Facility Page 20

Thomas Jefferson National Accelerator Facility Page 21

Thomas Jefferson National Accelerator Facility Page 22 Xeon Phi PWA fitting program currently being developed on Xeon Phi MIC

Thomas Jefferson National Accelerator Facility Page 23 Summary CLAS-g12: High luminosity, high energy data set (5.5 GeV/c, 68 pb -1 ) ~10 6 exclusive  p  n        events PWA from 1 to 2 GeV Clear signals for a 1 (1260), a 2 (1320) and  2 (1670) No evidence for  1 (1600) exotic (neither intensity nor phase) Consistent with previous CLAS result Consistent with Pomeron exchange Search for exotic  1 (1400) in  exchange  Clear signal for a 2 (1320) No evidence for  1 (1400) Strangeonium (  ) No significant resonant structures Prospects Neutral       K s K + K - Collaborative (Jlab,GWU) Effort to Include Baryon Resonances in PWA

Thomas Jefferson National Accelerator Facility Page 24 Other Slides

Thomas Jefferson National Accelerator Facility Page 25  1 (1600) phase

Thomas Jefferson National Accelerator Facility Page 26  1 (1600) phase E852/1998

Thomas Jefferson National Accelerator Facility Page 27 Jackson Frame Angles

Thomas Jefferson National Accelerator Facility Page 28

Thomas Jefferson National Accelerator Facility Page 29