Springer Berlin Heidelberg
Berlin/Heidelberg
Springer
13130
10.1007/13130.1029-8479
1029-8479
32745009
Journal of High Energy Physics
J. High Energ. Phys.
Physics
Elementary Particles, Quantum Field Theory
Quantum Field Theories, String Theory
Classical and Quantum Gravitation, Relativity Theory
Quantum Physics
Physics and Astronomy
2018
2018
12
11
11
87
2018
11
SISSA, Trieste, Italy
2018
9401
1805.00984
10.1007/JHEP11(2018)094
94
94
Unitarity of the box diagram
Regular Article - Theoretical Physics
1
20
2018
11
14
2018
9
26
2018
11
8
2018
11
14
The Author(s)
2018
13130
2018
2018
11
11
Roji
Pius
rpius@perimeterinstitute.ca
Ashoke
Sen
sen@hri.res.in
0000 0000 8658 0851
grid.420198.6
Perimeter Institute for Theoretical Physics
Waterloo
ON
N2L 2Y5
Canada
0000 0004 0610 8047
grid.450311.2
Harish-Chandra Research Institute, HBNI
Chhatnag Road, Jhusi
Allahabad
211019
India
Abstract
The complete proof of cutting rules needed for proving perturbative unitarity of quantum field theories usually employs the largest time equation or old fashioned perturbation theory. None of these can be generalized to string field theory that has non-local vertices. In
arXiv:1604.01783
we gave a proof of cutting rules in string field theory, which also provides an alternative proof of cutting rules in ordinary quantum field theories. In this note we illustrate how this works for the box diagram of ϕ
4 field theory, avoiding the contributions from anomalous thresholds.
Keywords
Scattering Amplitudes
String Field Theory
ArXiv ePrint:
1805.00984