SEARCH FOR HIGH-MASS PHOTON PAIRS IN E--]F(F)OVERBAR-GAMMA-GAMMA (F =E, MU,TAU, NU, Q) AT LEP(E)

Authors
BUSKULIC D DEBONIS I DECAMP D GHEZ P GOY C LEES JP MINARD MN PIETRZYK B ALEMANY R ARIZTIZABAL F COMAS P CRESPO JM DELFINO M FERNANDEZ E FERNANDEZBOSMAN M GAITAN V GARRIDO L MATTISON T PACHECO A PADILLA C PASCUAL A CREANZA D DEPALMA M FARILLA A IASELLI G MAGGI G NATALI S NUZZO S QUATTROMINI M RANIERI A RASO G ROMANO F RUGGIERI F SELVAGGI G SILVESTRIS L TEMPESTA P ZITO G CHAI Y HU H HUANG D HUANG X LIN J WANG T XIE Y XU D XU R ZHANG J ZHANG L ZHAO W BLUCHER E BONVICINI G BOUDREAU J CASPER D DREVERMANN H FORTY RW GANIS G GAY C HAGELBERG R HARVEY J HAYWOOD S HILGART J JACOBSEN R JOST B KNOBLOCH J LEHRAUS I LOHSE T MAGGI M MARKOU C MARTINEZ M MATO P MEINHARD H MINTEN A MIOTTO A MIQUEL R MOSER HG PALAZZI P PATER JR PERLAS JA PUSZTASZERI JF RANJARD F REDLINGER G ROLANDI L ROTHBERG J RUAN T SAICH M SCHLATTER D SCHMELLING M SEFKOW F TEJESSY W VEENHOF R WACHSMUTH H WIEDENMANN W WILDISH T WITZELING W WOTSCHACK J AJALTOUNI Z BADAUD F BARDADINOTWINOWSKA M ELFELLOUS R FALVARD A GAY P GUICHENEY C HENRARD P JOUSSET J MICHEL B MONTRET JC PALLIN D PERRET P PODLYSKI F PRORIOL J PRULHIERE F SAADI F FEARNLEY T HANSEN JD HANSEN JR HANSEN PH MOLLERUD R NILSSON BS EFTHYMIOPOULOS I KYRIAKIS A SIMOPOULOU E VAYAKI A ZACHARIADOU K BADIER J BLONDEL A BONNEAUD G BRIENT JC FOUQUE G ORTEU S ROUGE A RUMPF M TANAKA R VERDERI M VIDEAU H CANDLIN DJ PARSONS MI VEITCH E FOCARDI E MONETA L PARRINI G CORDEN M GEORGIOPOULOS C IKEDA M LANNUTTI J LEVINTHAL D SAWYER L WASSERBAECH S ANTONELLI A BALDINI R BENCIVENNI G BOLOGNA G BOSSI F CAMPANA P CAPON G CERUTTI F CHIARELLA V DETTORREPIAZZOLI B FELICI G LAURELLI P MANNOCCHI G MURTAS F MURTAS GP PASSALACQUA L PEPEALTARELLI M PICCHI P COLRAIN P TENHAVE I LYNCH JG MAITLAND W MORTON WT RAINE C REEVES P SCARR JM SMITH K SMITH MG THOMPSON AS TURNBULL RM BRANDL B BRAUN O GEWENIGER C HANKE P HEPP V KLUGE EE MAUMARY Y PUTZER A RENSCH B STAHL A TITTEL K WUNSCH M BEUSELINCK R BINNIE DM CAMERON W CATTANEO M COLLING DJ DORNAN PJ GREENE AM HASSARD JF LIESKE NM MOUTOUSSI A NASH J PATTON S PAYNE DG PHILLIPS MJ SANMARTIN G SEDGBEER JK TOMALIN IR WRIGHT AG GIRTLER P KNERINGER E KUHN D RUDOLPH G BOWDERY CK BRODBECK TJ FINCH AJ FOSTER F HUGHES G JACKSON D KEEMER NR NUTTALL M PATEL A SLOAN T SNOW SW WHELAN EP KLEINKNECHT K RAAB J RENK B SANDER HG SCHMIDT H STEEG F WALTHER SM WANKE R WOLF B BENCHEIKH AM BENCHOUK C BONISSENT A CARR J COYLE P DRINKARD J ETIENNE F NICOD D PAPALEXIOU S PAYRE P ROOS L ROUSSEAU D SCHWEMLING P TALBY M ADLUNG S ASSMANN R BAUER C BLUM W BROWN D CATTANEO P DEHNING B DIETL H DYDAK F FRANK M HALLEY AW JACOBS K LAUBER J LUTJENS G LUTZ G MANNER W RICHTER R SCHRODER J SCHWARZ AS SETTLES R SEYWERD H STIERLIN U STIEGLER U STDENIS R WOLF G BOUCROT J CALLOT O CORDIER A DAVIER M DUFLOT L GRIVAZ JF HEUSSE P JAFFE DE JANOT P KIM DW LEDIBERDER F LEFRANCOIS J LUTZ AM SCHUNE MH VEILLET JJ VIDEAU I ZHANG Z ABBANEO D BAGLIESI G BATIGNANI G BOTTIGLI U BOZZI C CALDERINI G CARPINELLI M CIOCCI MA DELLORSO R FERRANTE I FIDECARO F FOA L FORTI F GIASSI A GIORGI MA GREGORIO A LIGABUE F LUSIANI A MANNELLI EB MARROCCHESI PS MESSINEO A PALLA F RIZZO G SANGUINETTI G SPAGNOLO P STEINBERGER J TENCHINI R TONELLI G TRIGGIANI G VANNINI C VENTURI A VERDINI PG WALSH J BETTERIDGE AP CARTER JM GAO Y GREEN MG MARCH PV MIR LM MEDCALF T QUAZI IS STRONG JA WEST LR BOTTERILL DR CLIFFT RW EDGECOCK TR EDWARDS M FISHER SM JONES TJ NORTON PR SALMON DP THOMPSON JC BLOCHDEVAUX B COLAS P DUARTE H EMERY S KOZANECKI W LANCON E LEMAIRE MC LOCCI E MARX B PEREZ P RANDER J RENARDY JF ROSOWSKY A ROUSSARIE A SCHULLER JP SCHWINDLING J SIMOHAND D VALLAGE B JOHNSON RP LITKE AM TAYLOR G WEAR J ASHMAN JG BABBAGE W BOOTH CN BUTTAR C CARTWRIGHT S COMBLEY F DAWSON I THOMPSON LF BARBERIO E BOHRER A BRANDT S COWAN G GRUPEN C LUTTERS G RIVERA F SCHAFER U SMOLIK L BOSISIO L DELLAMARINA R GIANNINI G GOBBO B RAGUSA F BELLANTONI L CHEN W CINABRO D CONWAY JS COWEN DF FENG Z FERGUSON DPS GAO YS GRAHL J HARTON JL JARED RC LECLAIRE BW LISHKA C PAN YB SAADI Y SCHMITT M SHARMA V SHI ZH WALSH AM WEBER FV WU SL WU X ZHENG M ZOBERNIG G
Citation
D. Buskulic et al., SEARCH FOR HIGH-MASS PHOTON PAIRS IN E--]F(F)OVERBAR-GAMMA-GAMMA (F =E, MU,TAU, NU, Q) AT LEP(E), Physics letters. Section B, 308(3-4), 1993, pp. 425-434
Citations number
14
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
308
Issue
3-4
Year of publication
1993
Pages
425 - 434
Database
ISI
SICI code
0370-2693(1993)308:3-4<425:SFHPPI>2.0.ZU;2-M
Abstract
The result of a search for high mass photon pairs from the processes e + e- - ffgammagammaBAR (f = e, mu, tau, nu and q) with the ALEPH detec tor is reported. The result for f = e, mu and tau is to be compared wi th the observation of 4 events by the L3 Collaboration with invariant masses, M(gammagamma), of the two photons near 60 GeV. From a data sam ple approximately twice as large taken from 1990 to 1992, 6 events are found with M(gammagamma) distributed between 50 GeV and 72 GeV, while 4.9 events are expected from a QED calculation. There is no evidence for a mass peak; only one event (mu+ mu-gammagamma) at M(gammagamma) = 59.4 +/- 0.2 GeV is compatible with the L3 observation. In addition, for M(gammagamma) > 50 GeV, no event is found for e+e- - qqgammagammaB AR and only one event is found consistent with e+e- --> nunugammagamma ; this event has M(gammagamma) = 58.5 +/- 1.9 GeV. High mass photon pa ir events have also been searched for in gammagamma collisions. This a llows one to set an upper limit of 50 MeV for the width of an assumed resonance decaying to photon pairs.