Scattering Amplitudes and Contact Interactions in Witten’s Superstring Field Theory
نویسنده
چکیده
The four-massless-particle scattering amplitudes are calculated for Witten’s covariant superstring field theory. The picture-changing effect of the Ramond sector propagator and of the three-boson vertex is displayed. The results agree with the first-quantized prescription of Friedan, Martinet and Shenker except for -the four-boson amplitude, where an extra divergent contact term appears. The addition of-a four-boson counterterm to Witten’s action cancels the extra term, and is also necessary for gauge invariance of the action to order g2. Submitted to Nuclear Physics I3 * Work supported by the Department of Energy, contract DE AC03 76SF005 15.
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تاریخ انتشار 1987