Found 4 result(s)

### 29.04.2021 (Thursday)

#### Scattering Amplitudes Near the Origins: Localization and Globalization

Journal Club Benjamin Basso (ENS Paris)

 at: 15:15 Otherroom Zoom, instructions in abstract abstract: I will talk about the behaviour of gluon scattering amplitudes in planar N=4 SYM near kinematical corners coined Origins where maximally-helicity-violating amplitudes are expected to be exactly Gaussian in the logs of the cross ratios and exactly predictable. In part 1, I will recall how much is known about this behaviour for the 6-gluon amplitude and interpret the result as a sort of quantum area convoluting the minimal surface TBA data with an effective coupling constant, known as the tilted cusp anomalous dimension. In part 2, I will present a generalization to any number of gluons and explore (some bit of) the emerging parterre of Origins. If time permits, I will discuss applications to scattering amplitudes in the null limit where all two-particle Mandelstam vanish simultaneously. The talk is based on a work in progress with Lance Dixon, Yu-Ting Liu and Georgios Papathanasiou. ---- Part of the London Integrability Journal Club. If you are a new participant please register at integrability-london.weebly.com. The link will be emailed.

### 09.12.2015 (Wednesday)

#### Gluing hexagons into three point functions

Regular Seminar Benjamin Basso (ENS, Paris)

 at: 13:15 KCLroom S0.13 abstract: I will present a framework for computing correlators of three single trace operators in planar N=4 SYM theory that uses hexagonal patches as building blocks. This approach allows one to exploit the integrability of the theory and derive all loop predictions for its structure constants. After presenting the main ideas and results, I will discuss recent perturbative tests and open problems.

### 12.03.2015 (Thursday)

#### Gluon scattering amplitudes as flux-tube partition functions

Regular Seminar Benjamin Basso (ENS Paris)

 at: 14:00 QMWroom G.O. Jones 610 abstract: In this talk I will explain how to compute gluon scattering amplitudes at finite coupling in planar N=4 SYM theory, using the duality with null polygonal Wilson loops, conformal symmetry, and the integrability of the colour flux tube dynamics. After introducing the main ideas and results, I will present some applications of this formalism at strong coupling and discuss the validity of the semiclassical (dual) string description.

### 05.03.2014 (Wednesday)

#### Flux-tube methods for scattering amplitudes in planar N=4 SYM theory

Regular Seminar Benjamin Basso (ENS Paris)

 at: 14:00 ICroom H503 abstract: In this talk, I will explain how to compute gluon scattering amplitudes in planar N=4 Super-Yang-Mills theory using the flux tube (OPE) picture. The latter, which builds on the duality with light-like Wilson loops, provides a description of scattering amplitudes in terms of excitations evolving on a two-dimensional background. Exploiting the remarkable integrable structures of this background, one can formulate scattering amplitudes, at any values of the 't Hooft coupling, as an expansion around the multi-collinear (a.k.a. OPE) limit. I shall report on recent progress made in this direction and speculate on its possible application to the study of scattering amplitudes in the multi-Regge kinematics.