Photoproduction Experiment at Fermilab
The authors propose to continue and extend the program of photoproduction and pair production studies currently being carried out in Experiment E-87. The goals of the physics program they propose are: (1) to look for {mu}{sup {+-}}+e{sup {-+}}{nu}'s final states; (2) to study the mass spectra of hadronic final states which are produced in association with a single charged lepton (electron or muon); and (3) to determine the properties of a selected number of photoproduced multi-body hadronic final states; in particular: {gamma} + A {yields} ({bar p}p{pi}{sup +}{pi}{sup -}) + A {yields} ({pi}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup 0}) + A {yields} (K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}) + A {yields} (K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup 0}) + A etec., etc. The need for a heavy lepton pair production experiment is more crucial today than when they first proposed this experiment five years ago. The {mu}e pairs observed recently at SPEAR can be interpreted as arising from the decay of 2 GeV/c{sup 2} heavy leptons. They feel there is a compelling need to demonstrate that such {mu}e pairs are observed in at least one other reaction before such an interpretation can be considered completely satisfactory. To the best of their knowledge, the only independent reaction in which one might expect to observe such events is the pair production of heavy leptons. The broad band photon beam at Fermilab is perhaps the only beam in which such a pair production experiment is feasible. In addition, the probability of mis-identifying two hadrons as a {mu}e pair is extremely small (10{sup -6}) at Fermilab energies - several orders of magnitude smaller than at SPEAR. The primary motivation for examining the photoproduced hadronic final states such as {pi}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup 0} and K{sup +}K{sup -}{pi}{sup +}{pi}{sup -}{pi}{sup 0} is to search for structure in the mass spectra of these states. They propose to do so by both measuring and identifying these final state particles. They expect to observe hadronic decays of {psi} (3.1), {psi} (3.7), and other structures at higher masses.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 988426
- Report Number(s):
- FERMILAB-PROPOSAL-0458; TRN: US201018%%647
- Country of Publication:
- United States
- Language:
- English
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