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GlueX Experiment Document 2096-v1

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A Polarized High-Energy Photon Beam for Production of Exotic Mesons

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Igor Senderovich
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Igor Senderovich
Document Created:
10 Oct 2012, 14:32
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10 Oct 2012, 14:32
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10 Oct 2012, 14:32
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This work describes design, prototyping and testing of various components of the Jefferson Lab Hall~D photon beamline. These include coherent bremsstrahlung radiators to be used in this facility for generating the photon beam, a fine resolution hodoscope for the facility's tagging spectrometer, and a photon beam position sensor for stabilizing the beam on a collimator. The principal instrumentation project was the hodoscope: its design, implementation and beam testing will be thoroughly described. Studies of the coherent bremsstrahlung radiators involved X-ray characterization of diamond crystals to identify the appropriate line of manufactured radiators and the proper techniques for thinning them to the desired specification of the beamline. The photon beam position sensor project involved completion of a designed detector and its beam test. The results of these shorter studies will also be presented. The second part of this work discusses a Monte Carlo study of a possible photo-production and decay channel in the GlueX experiment that will be housed in the Hall~D facility. Specifically, the $\gamma p \rightarrow Xp \rightarrow b_1\pi \rightarrow \omega\pi^+\pi^-$ channel was studied including its Amplitude Analysis. This exercise attempted to generate a possible physics signal, complete with internal angular momentum states, and be able to reconstruct the signal in the detector and find the proper set of $J^{PC}$ quantum numbers through an amplitude fit. Derivation of the proper set of amplitudes in the helicity basis is described, followed by a discussion of the implementation, generation of the data sets, reconstruction techniques, the amplitude fit and results of this study.
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