SEARCH FOR ANOMALOUS PRODUCTION OF HIGH-MASS PHOTON PAIRS IN E- COLLISIONS AT LEP(E)

Authors
ACTON PD AKERS R ALEXANDER G ALLISON J ANDERSON KJ ARCELLI S ASTBURY A AXEN D AZUELOS G BAINES JTM BALL AH BANKS J BARLOW RJ BARNETT S BARTOLDUS R BATLEY JR BEAUDOIN G BECK A BECK GA BECKER J BEESTON C BEHNKE T BELL KW BELLA G BENTKOWSKI P BERLICH P BETHKE S BIEBEL O BLOODWORTH IJ BOCK P BODEN B BOSCH HM BOUTEMEUR M BREUKER H BRIGHTTHOMAS P BROWN RM BUIJS A BURCKHART HJ BURGARD C CAPILUPPI P CARNEGIE RK CARTER AA CARTER JR CHANG CY CHARLTON DG CHU SL CLARKE PEL CLAYTON JC COHEN I CONBOY JE COOPER M COUPLAND M CUFFIANI M DADO S DALLAVALLE GM DEJONG S DELPOZO LA DENG H DIECKMANN A DITTMAR M DIXIT MS SILVA ED DUBOSCQ JE DUCHOVN E DUCKECK G DUERDOTH IP DUMAS DJP ELCOMBE PA ESTABROOKS PG ETZION E EVANS HG FABBRI F FABBRO B FIERRO M FINCKEKEELER M FISCHER HM FONG DG FOUCHER M GAIDOT A GARY JW GASCON J GEDDES NI GEICHGIMBEL C GENSLER SW GENTIT FX GIACOMELLI G GIACOMELLI R GIBSON V GIBSON WR GILLIES JD GINGRICH DM GOLDBERG J GOODRICK MJ GORN W GRANDI C GRANT FC HAGEMANN J HANSON GG HANSROUL M HARGROVE CK HARRISON PF HART J HATTERSLEY PM HAUSCHILD M HAWKES CM HEFLIN E HEMINGWAY RJ HERTEN G HEUER RD HILL JC HILLIER SJ HILSE T HINSHAW DA HOBBS JD HOBSON PR HOCHMAN D HOMER RJ HONMA AK HUGHESJONES RE HUMBERT R IGOKEMENES P IHSSEN H IMRIE DC JANISSEN AC JAWAHERY A JEFFREYS PW JEREMIE H JIMACK M JONES M JONES RWL JOVANOVIC P JUI C KARLEN D KAWAGOE K KAWAMOTO T KEELER RK KELLOGG RG KENNEDY BW KLUTH S KOBAYASHI T KOETKE DS KOKOTT TP KOMAMIYA S KOPKE L KRAL JF KOWALEWSKI R VONKROGH J KROLL J KUWANO M KYBERD P LAFFERTY GD LAFOUX H LAHMANN R LAMARCHE F LAYTER JG LEBLANC P LEE AM LEHTO MH LELLOUCH D LEROY C LETTS J LEVEGRUN S LEVINSON L LLOYD SL LOEBINGER FK LORAH JM LORAZO B LOSTY MJ LOU XC LUDWIG J LUIG A MANNELLI M MARCELLINI S MARKUS C MARTIN AJ MARTIN JP MASHIMO T MATTIG P MAUR U MCKENNA J MCMAHON TJ MCNUTT JR MEIJERS F MENSZNER D MERRITT FS MES H MICHELINI A MIDDLETON RP MIKENBERG G MILDENBERGER J MILLER DJ MIR R MOHR W MOISAN C MONTANARI A MORI T MORII M MULLER U NELLEN B NGUYEN HH ONEALE SW OAKHAM FG ODORICI F OGREN HO ORAM CJ OREGLIA MJ ORITO S PANSART JP PANZERSTEINDEL B PASCHIEVICI P PATRICK GN PAZJAOSHVILI N PEARCE MJ PFISTER P PILCHER JE PINFOLD J PITMAN D PLANE DE POFFENBERGER P POLI B POULADDEJ A PRITCHARD TW PRZYSIEZNIAK H QUAST G REDMOND MW REES DL RICHARDS GE ROBINS SA ROBINSON D ROLLNIK A RONEY JM ROS E ROSSBERG S ROSSI AM ROSVICK M ROUTENBURG P RUNGE K RUNOLFSSON O RUST DR SASAKI M SBARRA C SCHAILE AD SCHAILE O SCHAPPERT W SCHARFFHANSEN P SCHENK P SCHMITT B VONDERSCHMITT H SCHRODER M SCHWICK C SCHWIENING J SCOTT WG SETTLES M SHEARS TG SHEN BC SHEPHERDTHEMISTOCLEOUS CH SHERWOOD P SIROLI GP SKILLMAN A SKUJA A SMITH AM SMITH TJ SNOW GA SOBIE R SPRINGER RW SPROSTON M STAHL A STEGMANN C STEPHENS K STEUERER J STROHMER R STROM D TAKEDA H TAKESHITA T TAREM S TECCHIO M TEIXEIRADIAS P TESCH N THOMSON MA TORRENTELUJAN E TOWERS S TRANSTROMER G TRESILIAN NJ TSUKAMOTO T TURNER MF VANDENPLAS D VANKOOTEN R VANDALEN GJ VASSEUR G VIRTUE CJ WAGNER A WAGNER DL WAHL C WARD CP WARD DR WATKINS PM WATSON AT WATSON NK WEBER M WEBER P WELLS PS WERMES N WHALLEY MA WILKENS B WILSON GW WILSON JA WINTERER VH WLODEK T WOLF G WOTTON S WYATT TR YAARI R YEAMAN A YEKUTIELI G YURKO M ZEUNER W ZORN GT
Citation
Pd. Acton et al., SEARCH FOR ANOMALOUS PRODUCTION OF HIGH-MASS PHOTON PAIRS IN E- COLLISIONS AT LEP(E), Physics letters. Section B, 311(1-4), 1993, pp. 391-407
Citations number
48
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
311
Issue
1-4
Year of publication
1993
Pages
391 - 407
Database
ISI
SICI code
0370-2693(1993)311:1-4<391:SFAPOH>2.0.ZU;2-N
Abstract
of 43 pb-1 collected with the OPAL detector. This search is motivated by the L3 observation of four events of the type e+e- --> l+l-gammagam ma with an invariant mass of the two photons, m(gammagamma), clusterin g around 60 GeV. In the OPAL data, four l+l-gammagamma events are foun d with m(gammagamma) above 40 GeV. The number of observed events is co nsistent with the QED expectation and no obvious resonance structure i s seen. Three candidate qqgammagammaBAR events with m(gammagamma) abov e 40 GeV are found and no nunugammagammaBAR candidate with m(gammagamm a) > 5 GeV is found. From these searches an upper limit is set on any anomalous production of l+l-gammagamma (l = e, mu, tau) events, where the l+l- pair comes from a virtual Z0 and m(gammagamma) is near 60 GeV , of B(Z0 --> Z0gammagamma --> l+l-gammagamma) < 6.0 x 10(-7) at the 95% CL. In a similar search in the reaction e+e- --> gammagammagamma, seven events are observed with a photon pairing of mass near 60 GeV co mpared to an expected background of 2.7 +/- 0.4 from QED. In a search for the production of a 60 GeV resonance X in two-photon collisions, a n upper limit is set on GAMMA(X)B2 (X --> gammagamma) of 2.6 MeV at th e 95% CL. A search is also performed for l+l-X (l = e, mu) events in n on-gammagamma decay modes of X. No indication of a 60 GeV resonance is seen. Combining these two searches, GAMMA(X) values greater than 110 MeV are excluded at the 95% CL for l+l-gammagamma (l = e, mu) cross-se ctions greater than 0.05 pb.