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The DNA of Particle Scattering
/ Dixon, LANCE (speaker)
Scattering amplitudes are where quantum field theory meets particle experiments, especially at the LHC where the copious scattering of quarks and gluons in QCD produces Higgs bosons and many backgrounds to new physics searches. For decades, it has been realized that the scattering of particles in gauge theories like QCD is far simpler than standard perturbative approaches would suggest. New approaches based on unitarity and bootstrapping have massively simplified many computations previously done with Feynman diagrams. Still, the final results are often highly intricate, multivariate mathematical functions, which are difficult to describe, let alone compute. In many cases, the functions have a "genetic code" underlying them, called the symbol, which reveals their structure. [...]
2023 - 4003.
Theory Colloquia
External link: Event details
In : The DNA of Particle Scattering
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Solving Scattering in N=4 Super-Yang-Mills Theory
/ Arkani-Hamed, Nima (Princeton, Inst. Advanced Study) ; Dixon, Lance J. (SLAC) ; McLeod, Andrew J. (CERN ; UCLA) ; Spradlin, Marcus (Brown U.) ; Trnka, Jaroslav (UC, Davis, QMAP) ; Volovich, Anastasia (Brown U.)
As part of the Snowmass community planning exercise, we highlight an ongoing program of research into the structure of scattering amplitudes in $N$ = 4 super-Yang-Mills theory, particularly in the planar limit of a large number of colors. [...]
arXiv:2207.10636 ; CERN-TH-2022-123 ; SLAC-PUB-17692.
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31 p.
Fulltext
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The SAGEX review on scattering amplitudes
/ Travaglini, Gabriele (Queen Mary, U. of London) ; Brandhuber, Andreas (Queen Mary, U. of London) ; Dorey, Patrick (Durham U.) ; McLoughlin, Tristan (Trinity Coll., Dublin ; Humboldt U., Berlin) ; Abreu, Samuel (CERN ; Edinburgh U., Inst. Astron.) ; Bern, Zvi (UCLA) ; Bjerrum-Bohr, N. Emil J. (Bohr Inst.) ; Blümlein, Johannes (DESY, Zeuthen) ; Britto, Ruth (Trinity Coll., Dublin) ; Carrasco, John Joseph M. (Northwestern U. ; IPhT, Saclay) et al.
This is an introduction to, and invitation to read, a series of review articles on scattering amplitudes in gauge theory, gravity, and superstring theory. Our aim is to provide an overview of the field, from basic aspects to a selection of current (2022) research and developments..
arXiv:2203.13011; SAGEX-22-01.-
2022-11-30 - 15 p.
- Published in : J. Phys. A 55 (2022) 443001
Fulltext: document - PDF; 2203.13011 - PDF;
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The Steinmann Cluster Bootstrap for $N$ = 4 Super Yang-Mills Amplitudes
/ Caron-Huot, Simon (McGill U.) ; Dixon, Lance J. (SLAC) ; Drummond, James M. (Southampton U.) ; Dulat, Falko (SLAC) ; Foster, Jack (Southampton U.) ; Gürdoğan, Ömer (Southampton U. ; Oxford U., Inst. Math.) ; von Hippel, Matt (Perimeter Inst. Theor. Phys. ; Bohr Inst.) ; McLeod, Andrew J. (SLAC ; Bohr Inst.) ; Papathanasiou, Georgios (DESY)
We review the bootstrap method for constructing six- and seven-particle amplitudes in planar $\mathcal{N}=4$ super Yang-Mills theory, by exploiting their analytic structure. We focus on two recently discovered properties which greatly simplify this construction at symbol and function level, respectively: the extended Steinmann relations, or equivalently cluster adjacency, and the coaction principle. [...]
arXiv:2005.06735; DESY-20-087.-
SISSA, 2020-05-14 - 37 p.
- Published in : PoS CORFU2019 (2020) 003
Fulltext: PDF; Fulltext from publisher: PDF;
In : 19th Hellenic School and Workshops on Elementary Particle Physics and Gravity, Corfu, Corfu, Greece, 31 Aug - 25 Sep 2019, pp.003
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Evanescent Effects Can Alter Ultraviolet Divergences in Quantum Gravity without Physical Consequences
/ Bern, Zvi (UCLA ; CERN) ; Cheung, Clifford (Caltech, Pasadena (main)) ; Chi, Huan-Hang (SLAC) ; Davies, Scott (UCLA) ; Dixon, Lance (Caltech, Pasadena (main) ; SLAC) ; Nohle, Josh (UCLA)
Evanescent operators such as the Gauss-Bonnet term have vanishing perturbative matrix elements in exactly D=4 dimensions. Similarly, evanescent fields do not propagate in D=4; a three-form field is in this class, since it is dual to a cosmological-constant contribution. [...]
arXiv:1507.06118; SLAC-PUB-16332; CERN-PH-TH-2015-162; UCLA-15-TEP-101; CALT-2015-036.-
Geneva : CERN, 2015 - 6 p.
- Published in : Phys. Rev. Lett. 115 (2015) 211301
APS Open Access article: PDF; Fulltext: PDF; External link: Preprint
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