SEARCH FOR ANOMALOUS PRODUCTION OF PHOTONIC EVENTS WITH MISSING ENERGY IN E(-) COLLISIONS AT ROOT-S=130-172 GEV()E()

Authors
ACKERSTAFF K ALEXANDER G ALLISON J ALTEKAMP N ANDERSON KJ ANDERSON S ARCELLI S ASAI S ASHBY SF AXEN D AZUELOS G BALL AH BARBERIO E BARLOW RJ BARTOLDUS R BATLEY JR BAUMANN S BECHTLUFT J BEESTON C BEHNKE T BELL AN BELL KW BELLA G BENTVELSEN S BETHKE S BETTS S BIEBEL O BIGUZZI A BIRD SD BLOBEL V BLOODWORTH IJ BLOOMER JE BOBINSKI M BOCK P BONACORSI D BOUTEMEUR M BRAIBANT S BRIGLIADORI L BROWN RM BURCKHART HJ BURGARD C BURGIN R CAPILUPPI P CARNEGIE RK CARTER AA CARTER JR CHANG CY CHARLTON DG CHRISMAN D CLARKE PEL COHEN I CONBOY JE COOKE OC COUYOUMTZELIS C COXE RL CUFFIANI M DADO S DALLAPICCOLA C DALLAVALLE GM DAVIS R DEJONG S DELPOZO LA DESCH K DIENES B DIXIT MS DOUCET M DUCHOVNI E DUCKECK G DUERDOTH IP EATOUGH D EDWARDS JEG ESTABROOKS PG EVANS HG EVANS M FABBRI F FANFANI A FANTI M FAUST AA FELD L FIEDLER F FIERRO M FISCHER HM FLECK I FOLMAN R FONG DG FOUCHER M FURTJES A FUTYAN DI GAGNON P GARY JW GASCON J GASCONSHOTKIN SM GEDDES NI GEICHGIMBEL C GERALIS T GIACOMELLI G GIACOMELLI P GIACOMELLI R GIBSON V GIBSON WR GINGRICH DM GLENZINSKI D GOLDBERG J GOODRICK MJ GORN W GRANDI C GROSS E GRUNHAUS J GRUWE M HAJDU C HANSON GG HANSROUL M HAPKE M HARGROVE CK HART PA HARTMANN C HAUSCHILD M HAWKES CM HAWKINGS R HEMINGWAY RJ HERNDON M HERTEN G HEUER RD HILDRETH MD HILL JC HILLIER SJ HOBSON PR HOCKER A HOMER RJ HONMA AK HORVATH D HOSSAIN KR HOWARD R HUNTEMEYER P HUTCHCROFT DE IGOKEMENES P IMRIE DC INGRAM MR ISHII K JAWAHERY A JEFFREYS PW JEREMIE H JIMACK M JOLY A JONES CR JONES G JONES M JOST U JOVANOVIC P JUNK TR KANZAKI J KARLEN D KARTVELISHVILI V KAWAGOE K KAWAMOTO T KAYAL PL KEELER RK KELLOGG RG KENNEDY BW KIRK J KLIER A KLUTH S KOBAYASHI T KOBEL M KOETKE DS KOKOTT TP KOLREP M KOMAMIYA S KRESS T KRIEGER P VONKROGH J KYBERD P LAFFERTY GD LAHMANN R LAI WP LANSKE D LAUBER J LAUTENSCHLAGER SR LAYTER JG LAZIC D LEE AM LEFEBVRE E LELLOUCH D LETTS J LEVINSON L LLOYD SL LOEBINGER FK LONG GD LOSTY MJ LUDWIG J LUI D MACCHIOLO A MACPHERSON A MANNELLI M MARCELLINI S MARKOPOULOS C MARKUS C MARTIN AJ MARTIN JP MARTINEZ G MASHIMO T MATTIG P MCDONALD WJ MCKENNA J MCKIGNEY EA MCMAHON TJ MCPHERSON RA MEIJERS F MENKE S MERRITT FS MES H MEYER J MICHELINI A MIKENBERG G MILLER DJ MINCER A MIR R MOHR W MONTANARI A MORI T MULLER U MIHARA S NAGAI K NAKAMURA I NEAL HA NELLEN B NISIUS R ONEALE SW OAKHAM FG ODORICI F OGREN HO OH A OLDERSHAW NJ OREGLIA MJ ORITO S PALINKAS J PASZTOR G PATER JR PATRICK GN PATT J PEREZOCHOA R PETZOLD S PFEIFENSCHNEIDER P PILCHER JE PINFOLD J PLANE JE POFFENBERGER P POLI B POSTHAUS A REMBSER C ROBERTSON S ROBINS SA RODNING N RONEY JM ROOKE A ROSSI AM ROUTENBURG R ROZEN Y RUNGE K RUNOLFSSON O RUPPEL U RUST DR RYLKO R SACHS K SAEKI T SANG WM SARKISYAN EKG SBARRA C SCHAILE AD SCHAILE O SCHARF F SCHARFFHANSEN P SCHIECK J SCHLEPER P SCHMITT B SCHMITT S SCHONING A SCHRODER M SCHULTZCOULON HC SCHUMACHER M SCHWICK C SCOTT WG SHEARS TG SHEN BC SHEPHERDTHEMISTOCLEOUS CH SHERWOOD P SIROLI GP SITTLER A SKILLMAN A SKUJA A SMITH AM SNOW GA SOBIE R SOLDNERREMBOLD S SPRINGER RW SPROSTON M STEPHENS K STEURER J STOCKHAUSEN B STOLL K STROM D STROHMER R SZYMANSKI P TAFIROUT R TALBOT SD TANAKA S TARAS P TAREM S TEUSCHER R THIERGEN M THOMSON MA VONTORNE E TORRENCE E TOWERS S TRIGGER I TROCSANYI Z TSUR E TURCOT AS TURNERWATSON MF UTZAT P VANKOOTEN R VERZOCCHI M VIKAS P VOKURKA EH VOSS H WACKERLE F WAGNER A WARD CP WARD DR WATKINS PM WATSON AT WATSON NK WELLS PS WERMES N WHITE JS WILKENS B WILSON GW WILSON JA WYATT TR YAMASHITA S YEKUTIELI G ZACEK V ZERZION D
Citation
K. Ackerstaff et al., SEARCH FOR ANOMALOUS PRODUCTION OF PHOTONIC EVENTS WITH MISSING ENERGY IN E(-) COLLISIONS AT ROOT-S=130-172 GEV()E(), EUROPEAN PHYSICAL JOURNAL C-PARTICLES AND FIELDS, 2(4), 1998, pp. 607-625
Citations number
66
Categorie Soggetti
Physics, Particles & Fields
Journal title
EUROPEAN PHYSICAL JOURNAL C-PARTICLES AND FIELDS → ACNP
ISSN journal
14346044
Volume
2
Issue
4
Year of publication
1998
Pages
607 - 625
Database
ISI
SICI code
1434-6044(1998)2:4<607:SFAPOP>2.0.ZU;2-Z
Abstract
Photonic events with large missing energy have been observed in e(+)e( -) collisions at centre-of-mass energies of 130, 136, 161 and 172 GeV using the OPAL detector at LEP. Results are presented based on search topologies designed to select events with a single photon and missing transverse energy or events with a pair of acoplanar photons. In both search topologies, cross-section measurements are performed within the kinematic acceptance of the selection. These results are compared wit h the expectations from the Standard Model processes e(+)e(-) --> nu<( nu)over bar>gamma(gamma) (single-photon) and e(+)e(-) --> nu<(nu)over bar>gamma gamma(gamma) (acoplanar-photons). No evidence is observed fo r new physics contributions to these final states. Upper limits on sig ma(e(+)e(-) --> XY).BR(X --> Y gamma) and sigma(e(+)e(-) --> XX).BR2(X --> Y gamma) are derived for the case of stable and invisible Y. Thes e limits apply to single and pair production of excited neutrinos (X = nu,Y = nu), to neutralino production (X = <(chi)over tilde>(0)(2),Y = <(chi)over tilde>(0)(1)), and to supersymmetric models in which X = <(chi)over tilde>(0)(1) and Y = (G) over tilde is a light gravitino. F or the latter scenario, the results of the acoplanar-photons search ar e used to provide model-dependent lower limits on the mass of the ligh test neutralino.