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GlueX Experiment 1

The GlueX ExperimentCurtis A. Meyer

Carnegie Mellon UniversityThe GlueX Collaboration

8/23/10

12 GeV electrons

40% lin. Pol.

Uncollimated

Collimated

Coherent Peak

GlueX

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GlueX Experiment 2

LQCD: The Spectrum of Mesons

8/23/10

J.J. Dudek (et al.) Phys. Rev. D 82, 034508 (2010)

Dynamical calculation of the isovector light-quark mesons.

JPC JPC JPC

(exotic)

3 identical quarks, pion mass~700MeV

Two lattice volumes

Exotic Quantum Numbers

Flux-tube Hybrids: r1 a1 b0 p0 a0 p1 p2 b2

Non-trivial Glue

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GlueX Experiment 3

LQCD: The Spectrum of Mesons

8/23/10

J.J. Dudek (et al.) Phys. Rev. D 82, 034508 (2010) JPC JPC JPC

(exotic)

3 identical quarks, pion mass~700MeV

Two lattice volumes.

Exotic Quantum Numbers

Non-trivial Glue

Mass in the 1.6 to 2.5 GeV Range

Flux-tube Hybrids: r1 a1 b0 p0 a0 p1 p2 b2

Dynamical calculation of the isovector light-quark mesons.

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GlueX Experiment 4

Identifying Exotics

8/23/10

The p1(1600) is reported in rp h’p b1p f1p

1 b1 , f1 , , a1

1(1300) , a1, f1h

b2 a1 , h1, a2h2 b1 ,

b0 (1300) , h1

h0 b1 , h1

Decay model expectations

1 b1 , f1 , , a1

1(1300) , a1, f1h

b2 a1 , h1, a2h2 b1 ,

b0 (1300) , h1

h0 b1 , h1

rp ppp 5-10mbb1 0.2p wpp mb a2 p hpp 0.2mbf1p , ’ h p 0.1mb

wp1mb

107g/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 30000 events per year, or about 1000 events perbin. This is a solid signal for the expected rates.

~1000 evts

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GlueX Experiment 5

Amplitude Analysis

8/23/10

E852 p-p -> Xp -> ’h p-p

•Determine Q.M. amplitudes (Ai) to describe data.•Fit for contributions of each Ai to get intensity and phases.•Fit for intensity and phase differences.

(1-+) p1

(2++) a2

(4++) a4

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.

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GlueX Experiment 6

Checks on the Amplitude Analysis

8/23/10

Different isospin channels

Different decay modes

Consider the photo production of a p1 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.

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GlueX Experiment 78/23/10

Tagger Area w/ Electron Beam Dump

Photon Beam Dump

Hall D

Counting House

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GlueX Experiment 88/23/10

Tagger Magnet @ JLab

Diamond @ UCONN

Microscope @ UCONN

Tagger @ CUA

Support @ UNC A&T

Active Collimator @ UCONN

Construction has started

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GlueX Experiment 98/23/10

BCAL @ Regina12/48 modules at JLab CDC @ CMU

FCAL @ IU

FDC @ JLab

P.S. @ UNCW

TOF @ FSU START @ FIU

TRIGGER @ Jlab, CNU

Electronics @ JLab, ICO, UMASS, USM

BCAL Readout @ USM

Calibration @ Athens

Solenoid @ JLab, ICO DAQ @ JLab

Construction has started

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GlueX Experiment 108/23/10