gamma gamma gamma gamma production at the LHC: An application of 2 arrow right 4 analytic unitarity

We present next-to-leading order (NLO) predictions for gamma gamma gamma gamma final states, including the effects of photon fragmentation. Our results are calculated fully analytically using the techniques of D-dimensional unitarity, and we discuss some refinements to existing methods, focusing par...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Veröffentlicht in:	Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2015-03, Vol.91 (5)
Hauptverfasser:	Dennen, Tristan, Williams, Ciaran
Format:	Artikel
Sprache:	eng
Schlagworte:	Cosmology Fragmentation Gravitation Mathematical analysis Mathematical models Monte Carlo methods Photons Triangles
Online-Zugang:	Volltext
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	We present next-to-leading order (NLO) predictions for gamma gamma gamma gamma final states, including the effects of photon fragmentation. Our results are calculated fully analytically using the techniques of D-dimensional unitarity, and we discuss some refinements to existing methods, focusing particularly on the role of three-mass triangle coefficients. Using these techniques we are able to produce a numerically stable Monte Carlo code that runs fully in double precision. We investigate the 4 gamma signal at colliders, both for Run II of the LHC and at future machines. Our results are implemented in MCFM.
ISSN:	1550-7998 1550-2368