DELPHI Collaboration (Including: Barker, Gary John). (2010) Study of the dependence of direct soft photon production on the jet characteristics in hadronic Z0 decays. The European Physical Journal C, Vol.67 (No.3-4). doi:10.1140/epjc/s10052-010-1315-5

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Abstract

An analysis of the direct soft photon production rate as a function of the parent jet characteristics is presented, based on hadronic events collected by the DELPHI experiment at LEP1. The dependences of the photon rates on the jet kinematic characteristics (momentum, mass, etc.) and on the jet charged, neutral and total hadron multiplicities are reported. Up to a scale factor of about four, which characterizes the overall value of the soft photon excess, a similarity of the observed soft photon behavior to that of the inner hadronic bremsstrahlung predictions is found for the momentum, mass, and jet charged multiplicity dependences. However for the dependence of the soft photon rate on the jet neutral and total hadron multiplicities a prominent difference is found for the observed soft photon signal as compared to the expected bremsstrahlung from final state hadrons. The observed linear increase of the soft photon production rate with the jet total hadron multiplicity and its strong dependence on the jet neutral multiplicity suggest that the rate is proportional to the number of quark pairs produced in the fragmentation process, with the neutral pairs being more effectively radiating than the charged ones.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Electron-positron interactions, Photons, Hadron beams, Hadrons -- Decay
Journal or Publication Title:	The European Physical Journal C
Publisher:	Springer
ISSN:	1434-6044
Official Date:	June 2010
Dates:	Date Event June 2010 Published
Volume:	Vol.67
Number:	No.3-4
DOI:	10.1140/epjc/s10052-010-1315-5
Status:	Peer Reviewed
Access rights to Published version:	Open Access
Funder:	Austria. Bundesministerium für Wissenschaft und Forschung [Federal Ministry of Education, Science and Culture], Fonds national de la recherche scientifique (Belgium) (FNRS), Fonds Wetenschappelijk Onderzoek (FWO), Agentschap voor Innovatie door Wetenschap en Technologie (Belgium) (IWT), Belgium. Services fédéraux des affaires scientifiques, techniques et culturelles (OSTC), Financiadora de Estudos e Projetos (Brazil) (FINEP), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Brazil. Coordenação do Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Fundação Universitária José Bonifácio (FUJB), Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ), Czech Republic. Ministerstvo školství, mládeže a tělovýchovy [Ministry of Education, Youth, and Sport], Akademie věd České republiky [Academy of Sciences of the Czech Republic], Commission of the European Communities, Direction des Sciences de la Matière, France. Commissariat à l'énergie atomique (CEA), Germany. Bundesministerium für Bildung und Forschung (BMBF), Greece. General Secretariat of Research and Technology, Nederlandse Organisatie voor Wetenschappelijk Onderzoek [Netherlands Organisation for Scientific Research] (NWO), Stichting voor Fundamenteel Onderzoek der Materie (FOM) [Foundation for Fundamental Research on Matter], Norges forskningsråd [Norwegian Research Council], Scientific Research Committee (Poland), Fundação para a Ciência e a Tecnologia (FCT), Slovakia. Vedecka grantova agentura MS SR, Slovenia. Ministrstvo za znanost in tehnologijo [Ministry of Science and Technology], Spain. Comisión Interministerial de Ciencia y Tecnología (CICYT), Sweden. Vetenskapsrådet [Research Council], Science and Technology Facilities Council (Great Britain) (STFC), United States. Dept. of Energy, European Economic Community (EEC)

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