A note on NMHV form factors from the Grassmannian and the twistor string

被引：3

作者：

Meidinger, David ^{[1
,2
,3
]}

Nandan, Dhritiman ^{[4
,5
]}

Penante, Brenda ^{[6
]}

Wen, Congkao ^{[5
,7
,8
]}

机构：

[1] Humboldt Univ, Inst Math, Zum Grossen Windkanal 6, D-12489 Berlin, Germany

[2] Humboldt Univ, Inst Phys, Zum Grossen Windkanal 6, D-12489 Berlin, Germany

[3] IRIS Gebaude, Zum Grossen Windkanal 6, D-12489 Berlin, Germany

[4] Univ Edinburgh, Sch Phys & Astron, Higgs Ctr Theoret Phys, Edinburgh EH9 3JZ, Midlothian, Scotland

[5] Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA

[6] CERN, Theory Div, CH-1211 Geneva 23, Switzerland

[7] CALTECH, Walter Burke Inst Theoret Phys, Pasadena, CA 91125 USA

[8] Univ Calif Los Angeles, Mani L Bhaumik Inst Theoret Phys, Dept Phys & Astron, Los Angeles, CA 90095 USA

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2017年 / 09期

基金：

美国国家科学基金会; 欧洲研究理事会;

关键词：

Duality in Gauge Field Theories; Scattering Amplitudes; Supersymmetric Gauge Theory; YANG-MILLS THEORY;

D O I：

10.1007/JHEP09(2017)024

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

In this note we investigate Grassmannian formulas for form factors of the chiral part of the stress-tensor multiplet in N=4 superconformal Yang-Mills theory. We present an all-n contour for the G(3, n + 2) Grassmannian integral of NMHV form factors derived from on-shell diagrams and the BCFW recursion relation. In addition, we study other G(3, n + 2) formulas obtained from the connected prescription introduced recently. We find a recursive expression for all n and study its properties. For n >= 6, our formula has the same recursive structure as its amplitude counterpart, making its soft behaviour manifest. Finally, we explore the connection between the two Grassmannian formulations, using the global residue theorem, and find that it is much more intricate compared to scattering amplitudes.

引用

页数：24

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