The GlueX Experiment Curtis A. Meyer Carnegie Mellon University The GlueX Collaboration 8/23/10 1 GlueX Experiment 12 GeV electrons 40% lin. Pol. Uncollimated.

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Presentation transcript:

The GlueX Experiment Curtis A. Meyer Carnegie Mellon University The GlueX Collaboration 8/23/10 1 GlueX Experiment 12 GeV electrons 40% lin. Pol. Uncollimated Collimated Coherent Peak GlueX

LQCD: The Spectrum of Mesons 8/23/10 GlueX Experiment 2 J.J. Dudek (et al.) Phys. Rev. D 82, (2010) Dynamical calculation of the isovector light-quark mesons. J PC (exotic) 3 identical quarks, pion mass~700Me V Two lattice volumes Exotic Quantum Numbers Flux-tube Hybrids:  1 a 1 b 0  0 a 0  1  2 b 2 Non-trivial Glue

LQCD: The Spectrum of Mesons 8/23/10 GlueX Experiment 3 J.J. Dudek (et al.) Phys. Rev. D 82, (2010) J PC (exotic) 3 identical quarks, pion mass~700Me V Two lattice volumes. Exotic Quantum Numbers Non-trivial Glue Mass in the 1.6 to 2.5 GeV Range Flux-tube Hybrids:  1 a 1 b 0  0 a 0  1  2 b 2 Dynamical calculation of the isovector light-quark mesons.

Identifying Exotics 8/23/10 GlueX Experiment 4 The  1 (1600) is reported in   ’  b 1  f 1   1  b 1 , f 1 , , a 1   1  (1300) , a 1 , f 1  b 2  a 1 , h 1 ,  a 2  h 2  b 1 ,  b 0   (1300) , h 1  h 0  b 1 , h 1   Decay model expectations  1  b 1 , f 1 , , a 1   1  (1300) , a 1 , f 1  b 2  a 1 , h 1 ,  a 2  h 2  b 1 ,  b 0   (1300) , h 1  h 0  b 1 , h 1    5-10  b b 1  b a 2  0.2  b f 1   ’  0.1  b  1  b 10 7  /s 26 weeks running, 1/3 beam on, 30% reconstruction. If we produce an exotic with a 2 nb cross section over 400 MeV in mass (peak) (20 20MeV-wide bins), we expect about events per year, or about 1000 events per bin. This is a solid signal for the expected rates. ~1000 evts

Amplitude Analysis 8/23/10 GlueX Experiment 5 E852  - p -> Xp ->  ’  - p Determine Q.M. amplitudes (A i ) to describe data. Fit for contributions of each A i to get intensity and phases. Fit for intensity and phase differences. (1 -+ )  1 (2 ++ ) a 2 (4 ++ ) a 4 NSF: Physics at the Information Frontier IU/CMU/UCONN Develop Amplitude Analysis (AA) code appropriate for GlueX analysis. This includes theoretically more correct amplitudes, better interfaces to connect the amplitudes to data, Open Science Grid tools for AA and now development of GPU based tools. 1.OSG works for Monte Carlo production. 2.First generation tools used on CLAS data. 3.GPU code working on CLEO-c data. 4.Pursuing simulated GlueX data analysis.

Checks on the Amplitude Analysis 8/23/10 GlueX Experiment 6 Different isospin channels Different decay modes Consider the photo production of a  1 state. We should find consistent production and decay results across similar channels. We should be able to establish relative decay rates which is important when interpreting the results.

8/23/10 GlueX Experiment 7 Tagger Area w/ Electron Beam Dump Photon Beam Dump Hall D Counting House

8/23/10 GlueX Experiment 8 Tagger JLab UCONN UCONN CUA UNC A&T Active UCONN Construction has started

8/23/10 GlueX Experiment 9 Regina 12/48 modules at JLab CMU IU JLab UNCW FSU FIU Jlab, CNU JLab, ICO, UMASS, USM BCAL USM Athens JLab, JLab Construction has started

8/23/10 GlueX Experiment 10