Abstract
Motivated by recent V.A. Nikitin’s reports on observation of new light charged particles with a 2-meter JINR propane bubble chamber we perform an experiment at the LPI electron synchrotron "Pakhra" with the aim to detect such particles in the Bethe–Heitler process. Theoretical limits for masses of new light charged particles of spin 0, 1/2 and 1 arising from precise data on the muon anomalous magnetic moment are recalculated and updated. A geometry of the photoproduction experiment is proposed that optimizes signal-tonoise ratio. First results of the experiment are exposed.
Highlights
This work was motivated by recent sensational statements made by Prof
The main statement was that on 7000+ stereo photos made with the JINR 2-meter propane bubble chamber irradiated by 10-GeV protons of the JINR synchrophasotron there were identified a few tracks of unusual charged particles ± of the mass near 9 MeV
Nikitin called «anomalous leptons» due to some guesses concerning mass spectrum of leptons in the Standard Model and beyond, are produced in the electromagnetic conversion reactions γ → + + − caused by photons from decays of π0 generated in strong interactions of the proton beam with the substance of the bubble chamber
Summary
The main statement was that on 7000+ stereo photos made with the JINR 2-meter propane bubble chamber irradiated by 10-GeV protons of the JINR synchrophasotron there were identified a few tracks of unusual charged particles ± of the mass near 9 MeV These particles ( ±), which V.A. Nikitin called «anomalous leptons» due to some guesses concerning mass spectrum of leptons in the Standard Model and beyond, are produced in the electromagnetic conversion reactions γ → + + − caused by photons from decays of π0 generated in strong interactions of the proton beam with the substance of the bubble chamber. Nikitin successfully demonstrated that it works quite well in the case of known tracks of electrons and muons In total he found 9 anomalous tracks (of positive and negative electric charge) with the average particle mass 9.4 ± 2 MeV and momenta in the range 35−95 MeV. General restrictions to the new particles certainly exist, and we consider one of them related with precision data on the anomalous magnetic moment of the muon
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