Radiation zeros in high-energy $e^+e^-$ annihilation into hadrons

M. Heyssler; W.J. Stirling

doi:doi:10.1007/s100529800862

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2023 Impact factor 4.2

Particles and Fields

Eur. Phys. J. C 5, 475-484
DOI 10.1007/s100529800862

Radiation zeros in high-energy e⁺e^- annihilation into hadrons

M. Heyssler¹ - W.J. Stirling^1,2

¹ Department of Physics, University of Durham, Durham, DH1 3LE
² Department of Mathematical Sciences, University of Durham, Durham, DH1 3LE

Received: 16 December 1997 / Published online: 10 March 1998

Abstract
The process $e^+e^- \to q \bar q \gamma$ contains radiation zeros, i.e. configurations of the four-momenta for which the scattering amplitude vanishes. We calculate the positions of these zeros for u-quark and d-quark production and assess the feasibility of identifying the zeros in experiments at high energies. The radiation zeros are shown to occur also for massive quarks, and we discuss how the $b \bar b \gamma$ final state may offer a particularly clean environment in which to observe them.