Abstract
In this paper, we study the single and double soft behaviors of tree level off-shell currents and on-shell amplitudes in nonlinear sigma model (NLSM). We first propose and prove the leading soft behavior of the tree level currents with a single soft particle. In the on-shell limit, this single soft emission becomes the Adler’s zero. Then we establish leading and subleading soft behaviors of tree level currents with two adjacent soft particles. With a careful analysis of the on-shell limit, we obtain the double soft behaviors of on-shell amplitudes where the two soft particles are adjacent to each other. By applying Kleiss-Kuijf (KK) relation, we further obtain the leading and subleading behaviors of amplitudes with two nonadjacent soft particles.
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ArXiv ePrint: 1505.04411
On leave from Center for Field Theory and Particle Physics, Department of Physics, Fudan University (Yi-Jian Du).
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Du, YJ., Luo, H. On single and double soft behaviors in NLSM. J. High Energ. Phys. 2015, 58 (2015). https://doi.org/10.1007/JHEP08(2015)058
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DOI: https://doi.org/10.1007/JHEP08(2015)058