Measurement of the E+e− → Γγ(γ) Cross Section at LEP Energies
P ABREU,W ADAM,T ADYE,E AGASI,I AJINENKO,R ALEKSAN,GD ALEKSEEV,PP ALLPORT, S ALMEHED,FML ALMEIDA,SJ ALVSVAAG,U AMALDI,A ANDREAZZA,P ANTILOGUS,WD APEL,RJ APSIMON, Y ARNOUD,B ASMAN,JE AUGUSTIN,A AUGUSTINUS, P BAILLON,P BAMBADE,F BARAO,R BARATE,G BARBIELLINI,DY BARDIN,GJ BARKER,A BARONCELLI,O BARRING,JA BARRIO,W BARTL,MJ BATES,M BATTAGLIA,M BAUBILLIER,KH BECKS,M BEGALLI,P BEILLIERE,P BELTRAN, AC BENVENUTI,M BERGGREN,D BERTRAND,F BIANCHI,M BIGI,MS BILENKY,P BILLOIR,J BJARNE,D BLOCH,J BLOCKI,S BLYTH,V BOCCI, PN BOGOLUBOV,T BOLOGNESE,M BONESINI,W BONIVENTO,PSL BOOTH,G BORISOV,C BOSIO,B BOSTJANCIC,S BOSWORTH,O BOTNER,B BOUQUET,C BOURDARIOS,TJV BOWCOCK,M BOZZO,S BRAIBANT,P BRANCHINI,KD BRAND, RRA BRENNE,H BRIAND,C BRICMAN,L BRILLAULT,RCA BROWN,JM BRUNET,L BUGGE, T BURAN,A BUYS,JAMA BUYTAERT,M CACCIA,M CALVI,AJC ROZAS,R CAMPION,T CAMPORESI,V CANALE,K CANKOCAK,F CAO,F CARENA,P CARRILHO,L CARROLL,R CASES,C CASO,MVC GIMENEZ,A CATTAI,FR CAVALLO,L CERRITO,V CHABAUD,A CHAN,M CHAPKIN,P CHARPENTIER,J CHAUVEAU,P CHECCHIA,GA CHELKOV,L CHEVALIER,P CHLIAPNIKOV,V CHOROWICZ,JTM CHRIN,V CINDRO,P COLLINS, JL CONTRERAS,R CONTRI,E CORTINA,G COSME,F COUCHOT,HB CRAWLEY, D CRENNELL,G CROSETTI, JC MAESTRO,S CZELLAR,E DAHLJENSEN,J DAHM,B DALMAGNE,M DAM,G DAMGAARD,E DAUBIE,A DAUM,PD DAUNCEY,M DAVENPORT,J DAVIES,W DASILVA,C DEFOIX,P DELPIERRE,N DEMARIA, A DEANGELIS, H DEBOECK,W DEBOER,S DEBRABANDERE,C DECLERCQ,MDM DEFEZLASO,C DELAVAISSIERE, B DELOTTO,A DEMIN,L DEPAULA,H DIJKSTRA,L DICIACCIO,F DJAMA,J DOLBEAU,M DONSZELMANN,K DOROBA,M DRACOS,J DREES,M DRIS,Y DUFOUR,F DUPONT,D EDSALL,LO EEK,R EHRET,T EKELOF,G EKSPONG,M ELSING,JP ENGEL,N ERSHAIDAT,ME SANTO,V FALALEEV,D FASSOULIOTIS,M FEINDT,A FERRER,TA FILIPPAS,A FIRESTONE,H FOETH,E FOKITIS,F FONTANELLI,F FORMENTI,JL FOUSSET,S FRANCON, B FRANKEL,P FRENKIEL,DC FRIES, AG FRODESEN,R FRUHWIRTH,F FULDAQUENZER,H FURSTENAU,J FUSTER,D GAMBA,M GANDELMAN,C GARCIA,J GARCIA,C GASPAR,U GASPARINI,P GAVILLET,EN GAZIS,JP GERBER,P GIACOMELLI,D GILLESPIE, R GOLIELI,B GOLOB,VM GOLOVATYUK,JJG CADENAS,G GOPAL,L GORN,M GORSKI,V GRACCO,F GRARD,E GRAZIANI,G GROSDIDIER,B GROSSETETE,P GUNNARSSON,J GUY,U HAEDINGER,F HAHN,M HAHN,S HAHN,S HAIDER,Z HAJDUK,A HAKANSSON,A HALLGREN,K HAMACHER, GH DEMONCHENAULT,W HAO,FJ HARRIS,V HEDBERG,R HENRIQUES, JJ HERXNANDEZ,JA HERNANDO,P HERQUET,H HERR,TL HESSING,E HIGON,HJ HILKE,TS HILL,SO HOLMGREN, PJ HOLT,D HOLTHUIZEN,PF HONORE,M HOULDEN,J HRUBEC,K HUET,K HULTQVIST,P IOANNOU,PS IVERSEN,JN JACKSON,R JACOBSSON,P JALOCHA,G JARLSKOG, P JARRY,B JEANMARIE,EK JOHANSSON,M JONKER,L JONSSON,P JUILLOT,M KAISER,G KALMUS,F KAPUSTA,M KARLSSON,E KARVELAS,A KATARGIN,S KATSANEVAS,EC KATSOUFIS, R KERANEN,BA KHOMENKO,NN KHOVANSKI,B KING,NJ KJAER,H KLEIN,A KLOVNING,P KLUIT,A KOCHMEHRIN,JH KOEHNE,B KOENE,P KOKKINIAS,M KORATZINOS,K KORCYL,AV KORYTOV,V KOSTIOUKHINE,C KOURKOUMELIS,O KOUZNETSOV,PH KRAMER,M KRAMMER,C KREUTER,J KROLIKOWSKI,I KRONKVIST, W KRUPINSKI,K KULKA,K KURVINEN,C LACASTA,C LAMBROPOULOS,JW LAMSA, L LANCERI,P LANGEFELD,V LAPIN,I LAST,JP LAUGIER,R LAUHAKANGAS,G LEDER,F LEDROIT,R LEITNER,Y LEMOIGNE,J LEMONNE, G LENZEN,V LEPELTIER,T LESIAK,JM LEVY,E LIEB,A LOPEZFERNANDEZ,MAL AGUERA,M LOS,D LOUKAS,JJ LOZANO,P LUTZ,L LYONS,G MAEHLUM,JC MARIN,C MARIOTTI,A MARKOU,T MARON,S MARTI,C MARTINEZRIVERO,F MARTINEZVIDAL,F MATORRAS,C MATTEUZZI,G MATTHIAE,M MAZZUCATO,M MCCUBBIN,R MCKAY,R MCNULTY,J MEDBO, C MERONI,WT MEYER,M MICHELOTTO,E MIGLIORE,I MIKULEC,L MIRABITO,GV MITSELMAKHER,U MJOERNMARK,T MOA,R MOELLER,K MOENIG,MR MONGE,P MORETTINI,H MUELLER,WJ MURRAY,B MURYN,G MYATT,F NARAGHI,FL NAVARRIA,P NEGRI,S NEMECEK,W NEUMANN,N NEUMEISTER, R NICOLAIDOU,BS NIELSEN,PES NILSEN,P NISS,A NOMEROTSKI,A NORMAND,V OBRAZTSOV,AG OLSHEVSKI,R ORAVA,K OSTERBERG,A OURAOU,P PAGANINI,M PAGANONI,R PAIN,H PALKA,TD PAPADOPOULOU,L PAPE,F PARODI,A PASSERI,M PEGORARO,J PENNANEN,L PERALTA,H PERNEGGER,M PERNICKA,A PERROTTA,C PETRIDOU,A PETROLINI,HT PHILLIPS,G PIANA,F PIERRE,M PIMENTA,S PLASZCZYNSKI,O PODOBRIN,ME POL,G POLOK,P POROPAT,V POZDNIAKOV,M PREST,P PRIVITERA,A PULLIA,D RADOJICIC,S RAGAZZI,H RAHMANI,J RAMES,PN RATOFF,AL READ,M REALE,P REBECCHI,NG REDAELLI,M REGLER,D REID,PB RENTON,LK RESVANIS,F RICHARD,J RICHARDSON,J RIDKY,G RINAUDO, A ROMERO, J RONCAGLIOLO,P RONCHESE,EI ROSENBERG,E ROSSO,P ROUDEAU,T ROVELLI,W RUCKSTUHL,V RUHLMANNKLEIDER,A RUIZ,K RYBICKI,H SAARIKKO,Y SACQUIN,G SAJOT,J SALT,J SANCHEZ,M SANNINO,S SCHAEL,H SCHNEIDER,MAE SCHYNS,G SCIOLLA,F SCURI,AM SEGAR,A SEITZ,R SEKULIN,M SESSA,R SEUFERT,RC SHELLARD,I SICCAMA,P SIEGRIST,S SIMONETTI, F SIMONETTO,AN SISAKIAN,G SKJEVLING,G SMADJA,N SMIRNOV,O SMIRNOVA,GR SMITH,R SOSNOWSKI,D SOUZASANTOS,T SPASSOV,E SPIRITI,S SQUARCIA,H STAECK,C STANESCU,S STAPNES,I STAVITSKI,G STAVROPOULOS,K STEPANIAK,F STICHELBAUT,A STOCCHI,J STRAUSS,J STRAVER,R STRUB,B STUGU,M SZCZEKOWSKI,M SZEPTYCKA,P SZYMANSKI,T TABARELLI,O TCHIKILEV,GE THEODOSIOU,Z THOME,A TILQUIN,J TIMMERMANS,VG TIMOFEEV,LG TKATCHEV,T TODOROV,DZ TOET,A TOMARADZE,B TOME,E TORASSA,L TORTORA,D TREILLE,W TRISCHUK,G TRISTRAM,C TRONCON,A TSIROU,EN TSYGANOV,M TURALA,ML TURLUER,T TUUVA,IA TYAPKIN,M TYNDEL, S TZAMARIAS,B UEBERSCHAER,S UEBERSCHAER,O ULLALAND,V UVAROV,G VALENTI,E VALLAZZA,JAV FERRER,C VANDERVELDE,GW VANAPELDOORN, P VANDAM, M VANDERHEIJDEN, WK VANDONINCK,J VANELDIK,P VAZ,G VEGNI,L VENTURA,W VENUS,F VERBEURE,M VERLATO,LS VERTOGRADOV,D VILANOVA,P VINCENT,L VITALE,E VLASOV,AS VODOPYANOV,M VOLLMER,M VOUTILAINEN,V VRBA,H WAHLEN,C WALCK,F WALDNER,A WEHR,M WEIERSTALL,P WEILHAMMER,AM WETHERELL,JH WICKENS,M WIELERS,GR WILKINSON,WSC WILLIAMS,M WINTER,M WITEK, G WORMSER,K WOSCHNAGG,K YIP,O YUSHCHENKO,A ZAITSEV,A ZALEWSKA,P ZALEWSKI,D ZAVRTANIK,E ZEVGOLATAKOS,NI ZIMIN,M ZITO,D ZONTAR,R ZUBERI,G ZUMERLE
Physics letters B（1998）
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摘要
The total and the differential cross sections for the reaction e+e− → γγ(γ) have been measured with the DELPHI detector at LEP using an integrated luminosity of 36.9 pb−1. The results agree with the QED predictions and consequently there is no evidence for non-standard channels with the same experimental signature. The lower limits obtained on the QED cutoff parameters are Λ+ > 143 GeV and Λ− > 120 GeV, and the lower bound on the mass of an excited electron with an effective coupling constant λγ = 1 is 132 GeV/c2. Upper limits on the branching ratios for the decays Z0 → γγ, Z0 → π0γ, Z0 → ηγ and Z0 → γγγ have been determined to be 5.5 × 10−5, 5.5 × 10−5, 8.0 × 10−5, and 1.7 × 10−5 respectively. All the limits are at the 95% confidence level.
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