@article{734bc1a509c046918ecd23b66e7f7e2a,
title = "e+e- → γ + Hadrons",
abstract = "We give the spectrum in momentum and angle of directly produced γ's in e+e- → γ + hadrons, and show that in QCD if p⊥2 of the recoil hadron jet relative to the photon is large, the leading logarithmic corrections to the lowest order result are absent. This process is therefore of great value in learning whether QCD actually governs quark dynamics.",
author = "Farrar, {Glennys R.} and Ioffe, {B. L.}",
note = "Funding Information: Up until now our knowledge of physics at short distances has largely come from the investigation of deep inelastic eN and vN scattering and e+e '-annihilation. However it is important to keep in mind that these processes are all one-current induced and predictions for their behavior can be obtained from very general arguments such as the operator product expansion on the light cone \[e.g. 1 \]. Thus the success of these theoretical predictions is not enough to prove the correctness of any specific models such as the quark-parton model or QCD. Therefore it seems very important to us to investigate processes of other types, which should be on the one hand quantitatively calculable in some model, such as QCD, and on the other amenable to experimental verification. One such process is the direct emission of a hard photon (x = 2k.r/xfs ~ 1) in e+e - ~. + hadrons, which is related to the absorptive part of a product of four electromagnetic currents. Whereas o(e+e - ~ hadrons) is governed by a product of two currents and thus is related to the energy-momentum tensor, whose properties are simple in any theory, this four-current process is much more complicated and may be different in different theories. It is an elementary problem to calculate the differential cross section of hard photon emission in the process e+e ~ qq7 in quantum electrodynamics. At * Work supported in part by the U.S. Energy Research and De-velopment Administration under Contract EY76-C-03-0068. ! Alfred P. Sloan Foundation Fellow.",
year = "1977",
month = nov,
day = "7",
doi = "10.1016/0370-2693(77)90755-9",
language = "English (US)",
volume = "71",
pages = "118--120",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "Elsevier",
number = "1",
}