Evidence for final state photons in multihadronic decays of the Z 0

M Z Akrawy ,K Riles,V Gibson,T Tsukamoto,M Couch,C Wahl,A Michelini,L Köpke,R Yaari,B Lorazo,U Binder,H Mes,S Sanghera,P Routenburg,O Ganel,A Gaidot,P Ashton,G Vasseur,P Scharff-Hansen,E Heflin,M Weymann,P Lennert,M Jobes,K Runge,M Ogg,B Holl,M Coupland,K Stephens,R Kowalewski,F Odorici,H Kreutzmann,S Rossberg,T Behnke,T Kobayashi,D Karlen,P Leblanc,M Sproston,G Knop,J Gascon,F Lamarche,W Mohr,D Granite,I Cohen,M Kuwano,G Tysarczyk-Niemeyer,B Poli,G Yekutieli,A Dieckmann,J Banks,J Grunhaus,G Mikenberg,P Pfister,L Lessard,N Lupu,P Bock,A Rollnik,M Hauschild,D Hochman,M Hansroul,P Mättig,T Kawamoto,A Pouladdej,A Shapira,W Schappert,J Hagemann,J Ludwig,B Nellen,J Goldberg,J Raab,D Van Den Plas,A Buijs,S Orito,O Schaile,A Jawahery,M Jimack,W Gorn,J Von Krogh,H Von Der Schmitt,G Giacomelli,D Menszner,P Farthouat,H El Mamouni,P Debu,H Ihssen,P Kyberd,U Maur,G Maringer,M Regimbald,S Weisz,A J.p O'dowd ,J E Conboy ,B C Shen ,R K Carnegie ,J M Lorah ,W J Murray ,J P Martin ,J C Hill ,M M.b Lasota ,D C Imrie ,R J Homer ,M J Losty ,Takashi Yoshida ,A A Macbeth ,J R Carter ,M W Redmond ,P W Jeffreys ,J E Pilcher ,K J Anderson ,C M Roach ,M S Dixit ,R J Barlow ,S J Pawley ,Roger Jones ,J M Roney ,J P Pansart ,R E Hughes-Jones ,D E Plane ,V H Winterer ,I P Duerdoth ,D J.p Dumas ,E J Spreadbury ,S A Wotton ,R A Sansum ,F S Merritt ,A D Schaile ,G J Vandalen ,N K Watson ,H E Stier ,B P O'neill ,K W Bell ,A A Carter ,P M Watkins ,G P Siroli ,P M Hattersley ,R M Brown ,S W Gensler ,G D Lafferty ,C P Howarth ,F K Loebinger ,O Biebel ,D Lellouch ,T J Smith ,J Kroll ,C Ho ,W J Collins ,A C Mcpherson ,P Le Dû ,N C Wood ,A M Lee ,J Becker ,L J Levinson ,G A Snow ,C Fukunaga ,G Azuelos ,J Schwarz ,G Quast ,H M Fischer ,J R Batley ,P P Allport ,J Waterhouse ,G Alexander ,S Hou ,S L Lloyd ,T Mcmahon ,H H Nguyen ,J A Wilson ,M Minowa ,P Grosse‐Wiesmann ,S J Hillier ,S Marcellini ,H Oh ,A Wagner ,B J Wuensch ,M Deninno ,J T Baines ,S Bethke ,R Ströhmer ,Ch Geich-Gimbel ,G J Barker ,G Arnison ,M Sasaki ,K Kawagoe ,S W O’neale ,M Dittmar ,H Hagedorn ,J Allison ,S Schreiber ,M Turner ,E Duchovni ,T Mori ,G W Wilson ,P R Hobson ,N Wermes ,Isabelle Wingerter ,C Kleinwort ,Hiroshi Takeda ,Ö Runólfsson ,T R Wyatt ,M Cuffiani ,F Meijers ,M Mannelli ,T Takeshita ,R Brun ,G Bella ,T Mäshimo ,P G Murphy ,P Jovanović ,S Dado ,A Skuja ,C Milstène ,John C Armitage ,H Breuker ,B J Saunders ,P Igo‐Kemenes ,David Charlton ,H Jérémie ,E Etzion ,M Nozaki ,J Hobbs ,D J Miller ,A H Ball ,A Montanari ,J L Pinfold ,F Fabbri ,M T French ,J Ma ,P Sherwood ,J Chrin ,A Simon ,H Burckhart ,Yifan Yang ,W D Zeuner ,J C Hart ,D E Klem ,E Gross ,M Weber ,D Strom ,P Capiluppi ,S A Robins ,A T Watson ,R J Hemingway ,R W Springer ,A M Smith ,P A Elcombe ,G N Patrick ,R D Heuer ,A M Rossi ,R G Kellogg ,N I Geddes ,P G Estabrooks ,M J Goodrick ,J W Gary ,T P Kokott ,F G Oakham ,C M Hawkes ,J D Gillies ,M W Moss ,W R Gibson ,T W Pritchard ,C J Virtue ,J G Layter ,C N P Gee ,D L Rees ,M J Oreglia ,G M Dallavalle ,F X Gentit ,C Y Chang ,C P Ward ,I J Bloodworth ,C K Hargrove ,D G Fong ,R P Middleton ,B W Kennedy ,A J Martin ,D R Ward ,W J Larson ,G T Zorn

doi:10.1016/0370-2693(90)91347-e

Evidence for final state photons in multihadronic decays of the Z 0

M Z Akrawy , K Riles + Show 275 more

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https://doi.org/10.1016/0370-2693(90)91347-e

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#Decays Of New Particles #Primary Quarks + Show 8 more

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Abstract

From the observed yield and properties of isolated energetic photons in the reaction e +e −→Z 0→hadrons+ γ measured with the OPAL detector at LEP, evidence for final state radiation from primary quarks is obtained. Combined with the measurement of the total hadronic width of the Z 0, the observed rate allows the extraction of the electroweak coupling constants of up and down type quarks: ν 1 3 2 + a 1 3 2 = 1.24±0.47 and ν 2 3 2 + a 2 3 2 = 1.72±0.70 No evidence for additional photon production from anomalous decays of the Z 0 or from decays of new particles is found. This measurement limits the contribution to the total Z 0 width from such sources to be less than 8.2 MeV at the 95% confidence level.

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