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Titolo:
SEARCH FOR ANOMALOUS PRODUCTION OF HIGH-MASS PHOTON PAIRS IN E- COLLISIONS AT LEP(E)
Autore:
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;
Indirizzi:
UNIV BIRMINGHAM,SCH PHYS & SPACE RES BIRMINGHAM B15 2TT W MIDLANDS ENGLAND UNIV BOLOGNA,DIPARTIMENTO FIS I-40126 BOLOGNA ITALY INFN I-40126 BOLOGNA ITALY UNIV BONN,INST PHYS W-5300 BONN 1 GERMANY UNIV CALIF RIVERSIDE,DEPT PHYS RIVERSIDE CA 92521 UNIV CAMBRIDGE,CAVENDISH LAB CAMBRIDGE CB3 0HE ENGLAND CARLETON UNIV,DEPT PHYS OTTAWA K1S 5B6 ONTARIO CANADA CARLETON UNIV,CTR RES PARTICLE PHYS OTTAWA K1S 5B6 ONTARIO CANADA CERN,EUROPEAN ORG PARTICLE PHYS CH-1211 GENEVA 23 SWITZERLAND UNIV CHICAGO,ENRICO FERMI INST CHICAGO IL 60637 UNIV CHICAGO,DEPT PHYS CHICAGO IL 60637 UNIV FREIBURG,FAK PHYS W-7800 FREIBURG GERMANY UNIV HEIDELBERG,INST PHYS W-6900 HEIDELBERG GERMANY INDIANA UNIV,DEPT PHYS BLOOMINGTON IN 47405 UNIV LONDON,QUEEN MARY & WESTFIELD COLL LONDON E1 4NS ENGLAND UNIV LONDON BIRKBECK COLL LONDON WC1E 7HV ENGLAND UNIV LONDON UNIV COLL LONDON WC1E 6BT ENGLAND UNIV MANCHESTER,SCHUSTER LAB,DEPT PHYS MANCHESTER M13 9PL LANCS ENGLAND UNIV MARYLAND,DEPT PHYS COLL PK MD 20742 UNIV MONTREAL,PHYS NUCL LAB MONTREAL H3C 3J7 QUEBEC CANADA UNIV OREGON,DEPT PHYS EUGENE OR 97403 RUTHERFORD APPLETON LAB DIDCOT OX11 0QX OXON ENGLAND DAPNIA SPP F-91191 GIF SUR YVETTE FRANCE TECHNION ISRAEL INST TECHNOL,DEPT PHYS IL-32000 HAIFA ISRAEL TEL AVIV UNIV,DEPT PHYS & ASTRON IL-69978 TEL AVIV ISRAEL UNIV TOKYO,INT CTR ELEMENTARY PARTICLE PHYS TOKYO 113 JAPAN UNIV TOKYO,DEPT PHYS TOKYO 113 JAPAN KOBE UNIV KOBE 657 JAPAN BRUNEL UNIV UXBRIDGE UB8 3PH MIDDX ENGLAND WEIZMANN INST SCI,DEPT NUCL PHYS IL-76100 REHOVOT ISRAEL UNIV HAMBURG,DESY,INST EXPTL PHYS 2 W-2000 HAMBURG 13 GERMANY UNIV VICTORIA,DEPT PHYS VICTORIA V8W 3P6 BC CANADA UNIV BRITISH COLUMBIA,DEPT PHYS VANCOUVER V6T 1Z1 BC CANADA UNIV ALBERTA,DEPT PHYS EDMONTON T6G 2N5 AB CANADA DUKE UNIV,DEPT PHYS DURHAM NC 27708 TRIUMF VANCOUVER V6T 2A3 BC CANADA UNIV VICTORIA,IPP,DEPT PHYS VICTORIA V8W 3P6 BC CANADA SHINSHU UNIV MATSUMOTO NAGANO 390 JAPAN
Titolo Testata:
Physics letters. Section B
fascicolo: 1-4, volume: 311, anno: 1993,
pagine: 391 - 407
SICI:
0370-2693(1993)311:1-4<391:SFAPOH>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
Z0 DECAYS; RADIATIVE-CORRECTIONS; OPAL EXPERIMENT; BOSON; PARTICLES; DETECTOR; ENERGIES; LEPTONS; EVENTS; LIMITS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
48
Recensione:
Indirizzi per estratti:
Citazione:
P.D. 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

Abstract

of 43 pb-1 collected with the OPAL detector. This search is motivatedby the L3 observation of four events of the type e+e- --> l+l-gammagamma with an invariant mass of the two photons, m(gammagamma), clustering around 60 GeV. In the OPAL data, four l+l-gammagamma events are found with m(gammagamma) above 40 GeV. The number of observed events is consistent with the QED expectation and no obvious resonance structure is seen. Three candidate qqgammagammaBAR events with m(gammagamma) above 40 GeV are found and no nunugammagammaBAR candidate with m(gammagamma) > 5 GeV is found. From these searches an upper limit is set on anyanomalous production of l+l-gammagamma (l = e, mu, tau) events, wherethe 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 the95% CL. In a similar search in the reaction e+e- --> gammagammagamma,seven events are observed with a photon pairing of mass near 60 GeV compared to an expected background of 2.7 +/- 0.4 from QED. In a searchfor the production of a 60 GeV resonance X in two-photon collisions, an upper limit is set on GAMMA(X)B2 (X --> gammagamma) of 2.6 MeV at the 95% CL. A search is also performed for l+l-X (l = e, mu) events in non-gammagamma decay modes of X. No indication of a 60 GeV resonance is seen. Combining these two searches, GAMMA(X) values greater than 110MeV are excluded at the 95% CL for l+l-gammagamma (l = e, mu) cross-sections greater than 0.05 pb.

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Documento generato il 26/01/20 alle ore 10:39:42