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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1997, vol. 404, p. 173-178

Isobar electroproduction as a background from interaction of beams with residual gas at φ-factories

Achasov M. N., Achasov N. N., Golubev V. B., Serednyakov S. I.

It is shown that when beams interact with a residual gas at φ-factories the reaction of the electroproduction of the Δ (1232) isobar proceeds vigorously. The isobar decay gives ∼ 107 pions over an effective year of 107 s per meter of a residual gas. These pions are emitted largely across the beam axis with a resonance energy distribution at 265 MeV with a width 120 MeV in the isobar rest system. We present formulae for the distributions of the four-momentum transfer square, the angles, the energies and the momentum of the decay products, needed for the simulation of the process under consideration. © 1997 Published by Elsevier Science B.V.