Dmitry Berkaev

Backscattering of Laser Radiation on Ultrarelativistic Electrons in a Transverse Magnetic Field: Evidence of MeV-Scale Photon Interference

In this Letter we report an observation of interference effects in Compton scattering in the experiment held on the VEPP-2000 collider. Infrared laser radiation was scattered head-on the 990 MeV electrons inside the dipole magnet, where an electron orbit radius is about 140 cm. It was observed that the energy spectrum of backscattered photons, measured by a HPGe detector, differs from that defined by the Klein-Nishina cross section and scattering kinematics of free electrons. The explanation of the effect, proposed in terms of classical electrodynamics, is in agreement with QED calculations.

Measurement of the

The e+e-→K+K- cross section is measured in the center-of-mass energy range 1.05–2.00xa0GeV at the SND detector. The measurement is based on data with an integrated luminosity of 35u2009u2009pb-1 collected at the VEPP-2000 e+e--collider. The obtained results are consistent with the previous most accurate data obtained in the BABAR experiment and have a comparable accuracy.

\mathbf{e^+e^-\to K^+K^-}

The process

cross section in the energy range

e^+e^-to nbar{n}

\mathbf{\sqrt{s}=1.05-2.0}

has been studied at the VEPP-2000

GeV

e^+e^-

Study of the processe+e−→nn¯at the VEPP-2000e+e−collider with the SND detector

collider with the SND detector in the energy range from threshold up to 2 GeV. As a result of the experiment, the

Search for the

e^+e^-to nbar{n}

\eta^{\prime}\to e^+e^-

cross section and effective neutron form factor have been measured.

decay with the SND detector

A search for the process