• A
• A
• A
• ABC
• ABC
• ABC
• А
• А
• А
• А
• А
Regular version of the site
## Exact summation of leading logs around $T\bar T$ deformation of $O(N+1)$-symmetric 2D QFTs
We consider a general (beyond $T\bar T$) deformation of the 2D $O(N+1)$ $\sigma$-model by the irrelevant
and the $S$-matrix loses its factorization properties. We perform the all-order summation of the leading infrared logs for the  $2 \to 2$ scattering amplitude and provide the exact result for the  $2 \to 2$ $S$-matrix in the leading logarithmic approximation. These results can provide us with new insights into the properties of the theories deformed by irrelevant operators more general than the $T\bar T$ deformation.