SEARCH FOR HIGH-MASS GAMMA-GAMMA RESONANCES IN E(-)-]L(+)L(-)GAMMA-GAMMA, NU(NU)OVER-BAR-GAMMA-GAMMA AND Q(Q)OVER-BAR-GAMMA-GAMMA AT LEP-I()E()

Authors
ABREU P ADAM W ADYE T AGASI E AJINENKO I ALEKSAN R ALEKSEEV GD ALEMANY R ALLPORT PP ALMEHED S AMALDI U AMATO S ANDREAZZA A ANDRIEUX ML ANTILOGUS P APEL WD ARNOUD Y ASMAN B AUGUSTIN JE AUGUSTINUS A BAILLON P BAMBADE P BARAO F BARATE R BARBI M BARDIN DY BARONCELLI A BARRING O BARRIO JA BARTL W BATES MJ BATTAGLIA M BAUBILLIER M BAUDOT J BECKS KH BEGALLI M BEILLIERE P BELOKOPYTOV Y BENVENUTI AC BERGGREN M BERTINI D BERTRAND D BIANCHI F BIGI M BILENKY MS BILLOIR P BLOCH D BLUME M BOLOGNESE T BONESINI M BONIVENTO W BOOTH PSL BORISOV G BOSIO C BOTNER O BOUDINOV E BOUQUET B BOURDARIOS C BOWCOCK TJV BOZZO M BRANCHINI P BRAND KD BRENKE T BRENNER RA BRICMAN C BROWN RCA BRUCKMAN P BRUNET JM BUGGE L BURAN T BURGSMUELLER T BUSCHMANN P BUYS A CABRERA S CACCIA M CALVI M ROZAS AJC CAMPORESI T CANALE V CANEPA M CANKOCAK K CAO F CARENA F CARROLL L CASO C GIMENEZ MVC CATTAI A CAVALLO FR CHABAUD V CHARPENTIER P CHAUSSARD L CHECCHIA P CHELKOV GA CHEN M CHIERICI R CHLIAPNIKOV P CHOCHULA P CHOROWICZ V CHUDOBA J CINDRO V COLLINS P CONTRERAS JL CONTRI R CORTINA E COSME G COSSUTTI F CRAWLEY HB CRENNELL D CROSETTI G MAESTRO JC CZELLAR S DAHLJENSEN E DAHM J DALMAGNE B DAM M DAMGAARD G DAUNCEY PD DAVENPORT M DASILVA W DEFOIX C DEGHORAIN A DELLARICCA G DELPIERRE P DEMARIA N ANGELIS A DEBOER W DEBRABANDERE S DECLERCQ C DELAVAISSIERE C DELOTTO B DEMIN A DEPAULA L SAINTJEAN CD DIJKSTRA H DICIACCIO L DJAMA F DOLBEAU J DONSZELMANN M DOROBA K DRACOS M DREES J DREES KA DRIS M DURAND JD EDSALL D EHRET R EIGEN G EKELOF T EKSPONG G ELSING M ENGEL JP ERZEN B SANTO ME FALK E FASSOULIOTIS D FEINDT M FENYUK A FERRER A FICHET S FILIPPAS TA FIRESTONE A FISCHER PA FOETH H FOKITIS E FONTANELLI F FORMENTI F FRANEK B FRENKIEL P FRIES DC FRODESEN AG FRUHWIRTH R FULDAQUENZER F FUSTER J GALLONI A GAMBA D GANDELMAN M GARCIA C GARCIA J GASPAR C GASPARINI U GAVILLET P GAZIS EN GELE D GERBER JP GIBBS M GOKIELI R GOLOB B GOPAL G GORN L GORSKI M GOUZ Y GRACCO V GRAZIANI E GROSDIDIER G GRZELAK K GUMENYUK S GUNNARSSON P GUNTHER M GUY J HAHN F HAHN S HALLGREN A HAMACHER K HAO W HARRIS FJ HEDBERG V HENRIQUES R HERNANDEZ JJ HERQUET P HERR H HESSING TL HIGON E HILKE HJ HILL TS HOLMGREN SO HOLT PJ HOLTHUIZEN D HOORELBEKE S HOULDEN M HRUBEC J HUET K HULTQVIST K JACKSON JN JACOBSSON R JALOCHA P JANIK R JARLSKOG C JARLSKOG G JARRY P JEANMARIE B JOHANSSON EK JONSSON L JONSSON P JORAM C JUILLOT P KAISER M KAPUSTA F KARAFASOULIS K KARLSSON M KARVELAS E KATSANEVAS S KATSOUFIS EC KERANEN R KHOKHLOV Y KHOMENKO BA KHOVANSKI NN KING B KJAER NJ KLEIN H KLOVNING A KLUIT P KOENE B KOKKINIAS P KORATZINOS M KORCYL K KOURKOUMELIS C KOUZNETSOV O KRAMER PH KRAMMER M KREUTER C KRONKVIST I KRUMSTEIN Z KRUPINSKI W KUBINEC P KUCEWICZ W KURVINEN K LACASTA C LAKTINEH I LAMSA JW LANCERI L LANE DW LANGEFELD P LAST I LAUGIER JP LAUHAKANGAS R LEDER G LEDROIT F LEFEBURE V LEGAN CK LEITNER R LEMOIGNE Y LEMONNE J LENZEN G LEPELTIER V LESIAK T LIBBY J LIKO D LINDNER R LIPNIACKA A LIPPI I LOERSTAD B LOKEN JG LOPEZ JM LOUKAS D LUTZ P LYONS L MACNAUGHTON J MAEHLUM G MAIO A MALMGREN TGM MALYCHEV V MANDL F MARCO J MARCO R MARECHAL B MARGONI M MARIN JC MARIOTTI C MARKOU A MARON T MARTINEZRIVERO C MARTINEZVIDAL F GARCIA SMI MASIK J MATORRAS F MATTEUZII C MATTHIAE G MAZZUCATO M MCCUBBIN M MCKAY R MCNULTY R MEDBO J MERCK M MERONI C MEYER S MEYER WT MIAGKOV A MICHELOTTO M MIGLIORE E MIRABITO L MITAROFF M MJOERNMARK U MOA T MOELLER R MOENIG K MONGE MR MORETTINI P MUELLER H MUNDIM LM MURRAY WJ MURYN B MYATT G NARAGHI F NAVARRIA FL NAVAS S NAWROCKI K NEGRI P NEWMANN W NEUMEISTER N NICOLAIDOU R NIELSEN BS NIEUWENHUIZEN M NIKOLAENKO V NISS P NOMEROTSKI A NORMAND A NOVAK M OBERSCHULTEBECKMANN W OBRAZTSOV V OLSHEVSKI AG ONOFRE A ORAVA R OSTERBERG K OURAOU A PAGANINI P PAGANONI M PAGES P PAIN R PALKA H PAPADOPOULOU TD PAPAGEORGIOU K PAPE L PARKES C PARODI F PASSERI A PEGORANO M PERALTA L PERNICKA M PERROTTA A PETRIDOU C PETROLINI A PETROVYCK M PHILLIPS HT PIANA G PIERRE F PIMENTA M PLASZCZYNSKI S PODOBRIN O POL ME POLOK G POROPAT P POZDNIAKOV V PREST M PRIVITERA P PUKHAEVA N PULLIA A RADOJICIC D RAGAZZI S RAHMANI H RATOFF PN READ AL REALE M REBECCHI P REDAELLI NG REGLER M REID D RENTON PB RESVANIS LK RICHARD F RICHARDSON J RIDKY J RINAUDO G RIPP I ROMERO A RONCAGLIOLO I RONCHESE P ROOS L ROSENBERG EI ROSSO E ROUDEAU P ROVELLI T RUCKSTUHL W RUHLMANNKLEIDER V RUIZ A SAARIKKO H SACQUIN Y SADOVSKY A SAHR O SAJOT G SALT J SANCHEZ J SANNINO M SCHIMMELPFENNIG M SCHNEIDER H SCHWICKERATH U SCHYNS MAE SCIOLLA G SCURI F SEAGER P SEDYKH Y SEGAR AM SEITZ A SEKULIN R SERBELLONI L SHELLARD RC SICCAMA I SIEGRIST P SIMONETTI S SIMONETTO F SISAKIAN AN SITAR B SKAALI TB SMADJA G SMIRNOV N SMIRNOVA O SMITH GR SOLOVIANOV O SOSNOWSKI R SOUZASANTOS D SPASSOV T SPIRITI E SPONHOLZ P SQUARCIA S STANESCU C STAPNES S STAVITSKI L STEVENSON K STICHELBAUT F STOCCHI A STRAUSS J STRUB R STUGU B SZCZEKOWSKI M SZEPTYCKA M TABARELLI T TAVERNET JP TCHIKILEV O THOMAS J TILQUIN A TIMMERMANS J TKATCHEV LG TODOROV T TODOROVA S TOET DZ TOMARADZE A TONAZZO A TORTORA L TRANSTROMER G TREILLE D TRISCHUK W TRISTRAM G TROMBINI A TRONCON C TSIROU A TURLUER ML TYAPKIN IA TYNDEL M TZAMARIAS S UEBERSCHAER B ULLALAND O
Citation
P. Abreu et al., SEARCH FOR HIGH-MASS GAMMA-GAMMA RESONANCES IN E(-)-]L(+)L(-)GAMMA-GAMMA, NU(NU)OVER-BAR-GAMMA-GAMMA AND Q(Q)OVER-BAR-GAMMA-GAMMA AT LEP-I()E(), Zeitschrift fur Physik. C, Particles and fields, 72(2), 1996, pp. 179-190
Citations number
20
Categorie Soggetti
Physics, Particles & Fields
Journal title
Zeitschrift fur Physik. C, Particles and fields → ACNP
ISSN journal
01709739
Volume
72
Issue
2
Year of publication
1996
Pages
179 - 190
Database
ISI
SICI code
0170-9739(1996)72:2<179:SFHGRI>2.0.ZU;2-6
Abstract
A search for high mass photon pairs from the processes e(+)e(-) --> l( +)l(-)gamma gamma, e(+)e(-) --> <q(q)over bar gamma gamma> and e(+)e(- ) --> nu nu gamma gamma with the DELPHI detector at LEP I is reported. From a data sample containing 3.5 million hadronic Z(0) decays, colle cted by DELPHI during the years 1991 to 1994, 79 events with two charg ed leptons and two isolated photons were selected with photon pair mas ses above 10 GeV/c(2), where 76 +/- 6 events were predicted from stand ard sources. In the same data sample, no <nu(nu)over bar gamma gamma> candidates were found and no accumulation of events was visible for ga mma gamma masses above 10 GeVlc2 in the q<q(q)over bar gamma gamma> ch annel. Upper limits at 95% confidence level on the Z(0) branching rati os for the three different channels were extracted from the data. In t he mass region m(gamma gamma) > 30 CeV/c(2) the limits obtained are be tween 3x10(-6) and 4x10(-6).