DELPHI Collaboration (Including: Barker, Gary John). (2008) Observation of the muon inner bremsstrahlung at LEP1. The European Physical Journal C, Vol.57 (No.3). pp. 499-514. doi:10.1140/epjc/s10052-008-0779-z ISSN 1434-6044.

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Abstract

Muon bremsstrahlung photons converted in front of the DELPHI main tracker (TPC) in dimuon events at LEP1 were studied in two photon kinematic ranges: 0.2<E γ ≤1 GeV and transverse momentum with respect to the parent muon p T <40 MeV/c, and 1<E γ ≤10 GeV and p T <80 MeV/c. A good agreement of the observed photon rate with predictions from QED for the muon inner bremsstrahlung was found, contrary to the anomalous soft photon excess that has been observed recently in hadronic Z 0 decays. The obtained ratios of the observed signal to the predicted level of the muon bremsstrahlung are 1.06±0.12±0.07 in the photon energy range 0.2<E γ ≤1 GeV and 1.04±0.09±0.12 in the photon energy range 1<E γ ≤10 GeV. The bremsstrahlung dead cone is observed for the first time in the direct photon production at LEP.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Electron-positron interactions, Muons, Bremsstrahlung, Photons, Hadrons -- Decay
Journal or Publication Title:	The European Physical Journal C
Publisher:	Springer
ISSN:	1434-6044
Official Date:	October 2008
Dates:	Date Event October 2008 Published
Volume:	Vol.57
Number:	No.3
Page Range:	pp. 499-514
DOI:	10.1140/epjc/s10052-008-0779-z
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
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], Particle Physics and Astronomy Research Council (Great Britain) (PPARC), United States. Dept. of Energy, European Economic Community (EEC)
Grant number:	GZ 616.364/2-III/2a/98, LC527, AV0Z10100502, SPUB-M/CERN/PO3/DZ296/2000, SPUB-M/CERN/PO3/DZ297/2000, 2P03B 104 19, 2P03B 69 23(2002-2004), 95/5195/134, AEN99-0950, AEN99-0761, DE-FG02-01ER41155, HPRN-CT-00292-2002

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