CHARMED PHYSICS AT THE TAGGED PHOTON LAB
Journal Article
·
OSTI ID:933208
The recent discoveries of heavy narrow resonances at masses of 3.1 and 3.7 Gev came at the same time as the successful testing by our group of the electron beam in the Fermilab Tagged Photon Facility. The timing is perfect, as this facility with its clean environment and relatively high photon fluxes and energies will be the ideal location for several important experiments suggested by the new results. We outline below the new significance of our experiment to measure the photon total cross section (Experiment 25A), as well as six other experiments to study the new phenomena we can perform with little increase in running time and with the apparatus already being prepared for Experiment 25. This apparatus is particularly well suited for these experiments which include a definitive check on whether the new resonances are photo produced, a search for a pseudoscaler particle made of charmed quarks and a study of neutral decay modes (which may well be dominant) of new particles. Several of these experiments can most likely be performed nowhere else but the Tagged Photon Lab. We propose to spend some time during testing of the tagging system and the Experiment 25 apparatus to determine the feasibility of these new experiments. The tests of the electron beam demonstrated that tagged photons with fluxes and backgrounds with {+-} 30% of predictions will be a reality by May, 1975. An informal report on these tests is included as an appendix. These tests and our consideration of these new experiments lead us to conclude that both the study of {sigma}{sub tot} ({gamma}P) and {sigma}{sub tot} ({gamma}A) and the new measurements we here propose will make substantial contributions to the understanding of these new phenomena. We, therefore, request that the Laboratory continue to give as high a priority as possible to the completion of the tagged photon beam.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 933208
- Report Number(s):
- FERMILAB-PUB-74-123-E
- Country of Publication:
- United States
- Language:
- English
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