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First evidence of hard scattering processes in single tagged gamma-gamma-collisions

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First evidence of hard scattering processes in single tagged gamma-gamma-collisions

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dc.contributor.author	DELPHI Collaboration
dc.contributor.author	Higón Rodríguez, Emilio
dc.contributor.author	Cases Ruiz, Ramón
dc.contributor.author	Castillo Giménez, María Victoria
dc.contributor.author	Chrin, J. T. M.
dc.contributor.author	Cortina Gil, Eduardo
dc.contributor.author	Ferrer Soria, Antonio
dc.contributor.author	Fuster Verdú, Juan A.
dc.contributor.author	García García, Carmen
dc.contributor.author	Gómez Cadenas, Juan José
dc.contributor.author	Hernández Rey, Juan José
dc.contributor.author	Hernando Morata, José Ángel
dc.contributor.author	Lacasta Llácer, Carlos
dc.contributor.author	Lozano Bahilo, José Julio
dc.contributor.author	Martínez Vidal, Fernando
dc.contributor.author	Martí García, Salvador
dc.contributor.author	Navas Concha, Sergio
dc.contributor.author	Salt Cairols, José
dc.contributor.author	Valls Ferrer, Juan Antonio
dc.date.accessioned	2014-05-06T09:49:18Z
dc.date.available	2014-05-06T09:49:18Z
dc.date.issued	1995
dc.identifier.citation	DELPHI Collaboration Higón Rodríguez, Emilio Cases Ruiz, Manuel Ramón Castillo Giménez, María Victoria 1995 First evidence of hard scattering processes in single tagged gamma-gamma-collisions Physics Letters B 342 1-4 402 416
dc.identifier.uri	http://hdl.handle.net/10550/34918
dc.description.abstract	For the first time, multihadronic production from single tagged gammagamma collisions has been studied, where one of the scattered leptons was tagged at very low virtual photon absolute mass squared ( = 0.06GeV/(c2))2 ). Data collected during 1991 and 1992 in the DELPHI experiment at LEP are shown to agree well with predictions which included the non-perturbative vector meson dominance model in which the interacting photons are assumed to have converted into a vector meson (rho, omega or pi), a quark-parton model which describes direct photon interactions and a QCD-based model which considers the photon to have quark and gluon structure functions. Five different parametrizations of these structure functions were used and the predictions compared with the data. This study confirms recent results from no-tag experiments in requiring a QCD-based component to successfully describe the data, indicating that the photon has a significant partonic content.
dc.relation.ispartof	Physics Letters B, 1995, vol. 342, num. 1-4, p. 402-416
dc.subject	Partícules (Física nuclear)
dc.subject	Col·lisions (Física nuclear)
dc.title	First evidence of hard scattering processes in single tagged gamma-gamma-collisions
dc.type	journal article	es_ES
dc.date.updated	2014-05-06T09:49:18Z
dc.identifier.doi	10.1016/0370-2693(94)01522-E
dc.identifier.idgrec	006561
dc.rights.accessRights	open access	es_ES