High-energy multileg electroweak processes and unitarity

Cornwall, JM; Tiktopoulos, G

dc.contributor.author	Cornwall, JM	en
dc.contributor.author	Tiktopoulos, G	en
dc.date.accessioned	2014-03-01T01:08:53Z
dc.date.available	2014-03-01T01:08:53Z
dc.date.issued	1992	en
dc.identifier.issn	0556-2821	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10713
dc.subject.classification	Astronomy & Astrophysics	en
dc.subject.classification	Physics, Particles & Fields	en
dc.subject.other	PERTURBATION-THEORY	en
dc.subject.other	BARYON-NUMBER	en
dc.subject.other	GAUGE THEORIES	en
dc.subject.other	LARGE ORDER	en
dc.subject.other	AMPLITUDES	en
dc.subject.other	BREAKDOWN	en
dc.subject.other	VIOLATION	en
dc.subject.other	FREEDOM	en
dc.subject.other	MODEL	en
dc.title	High-energy multileg electroweak processes and unitarity	en
heal.type	journalArticle	en
heal.identifier.primary	10.1103/PhysRevD.45.2105	en
heal.identifier.secondary	http://dx.doi.org/10.1103/PhysRevD.45.2105	en
heal.language	English	en
heal.publicationDate	1992	en
heal.abstract	Because of the failure of the dilute-instanton-gas approximation (DIGA) at high energies, recent calculations of (B + L)-violating processes in the standard model show blatant violations of unitarity, and suggest that these processes may be relatively unsuppressed at multiplicities N approximately alpha(W)-1. We show how to cure the DIGA failure and restore the high-energy behavior necessary for consistency with unitarity in two ways: one in Minkowski space and the other in Euclidean space. In Euclidean space this is done by solving the classical field equations in the presence of space-time-dependent sources; we work out an explicit example. The same techniques allow us to investigate a similar failure of.high-energy behavior in perturbation theory [(B + L)-conserving processes] as studied with the DIGA in the manner of Lipatov. An independent Minkowski-space analysis, also dealing with classical solutions in the presence of sources, confirms these results and shows that even with the right high-energy behavior, factors growing rapidly with N when N greater-than-or-equal-to alpha(W)-1 still violate unitarity in the (B + L)-conserving sector. Within the framework of a simple model which automatically restores unitarity, we investigate whether dispersion integrals relating high- and low-energy (B + L)-violating processes can restrict the size of the high-energy B + L violation, and find that they cannot.	en
heal.publisher	AMERICAN PHYSICAL SOC	en
heal.journalName	Physical Review D	en
dc.identifier.doi	10.1103/PhysRevD.45.2105	en
dc.identifier.isi	ISI:A1992HJ69100029	en
dc.identifier.volume	45	en
dc.identifier.issue	6	en
dc.identifier.spage	2105	en
dc.identifier.epage	2120	en