SEARCH FOR SCALAR TOP AND SCALAR BOTTOM QUARKS AT ROOT-S=170-172 GEV IN E(-) COLLISIONS()E()

Authors
ACKERSTAFF K ALEXANDER G ALLISON J ALTEKAMP N ANDERSON KJ ANDERSON S ARCELLI S ASAI S 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 BERLICH P BETHKE S BIEBEL O BIGUZZI A BIRD SD BLOBEL V BLOODWORTH IJ BLOOMER JE BOBINSKI M BOCK P BONACORSI D BOUTEMEUR M BOUWENS BT 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 CUFFIANI M DADO S DALLAPICCOLA C DALLAVALLE GM DEJONG S DELPOZO LA DESCH K DIXIT MS SILVA EDE DOUCET M DUCHOVNI E DUCKECK G DUERDOTH IP EATOUGH D EDWARDS JEG ESTABROOKS PG EVANS HG EVANS M FABBRI F FANTI M FAUST AA 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 HILSE T HOBSON PR HOMER RJ HONMA AK HORVATH D HOWARD R 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 KARLEN D KARTVELISHVILI V KAWAGOE K KAWAMOTO T 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 MACCHIOLO A MACPHERSON A MANNELLI M MARCELLINI S 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 MORII M MULLER U NAGAI K NAKAMURA I NEAL HA NELLEN B NISIUS R ONEALE SW OAKHAM FG ODORICI F OGREN HO OLDERSHAW NJ OREGLIA MJ PALINKAS J PASZTOR G PATER JR PATRICK GN PATT J PEARCE MJ PETZOLD S PFEIFENSCHNEIDER P PILCHER JE PINFOLD J PLANE DE POFFENBERGER P POLI B POSTHAUS A PRZYSIEZNIAK H REES DL RIGBY D ROBERTSON S ROBINS SA RODNING N RONEY JM ROOKE A ROS E ROSSI AM ROSVICK M ROUTENBURG P ROZEN Y RUNGE K RUNOLFSSON O RUPPEL U RUST DR RYLKO R SACHS K SAEKI T SARKISYAN EKG SBARRA C SCHAILE AD SCHAILE O SCHARF F SCHARFFHANSEN P SCHENK P SCHIECK J SCHLEPER P SCHMITT B SCHMITT S SCHONING A SCHRODER M SCHULTZCOULON HC SCHULZ M 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 STEUERER J STOCKHAUSEN B STOLL K STROM D SZYMANSKI P TAFIROUT R TALBOT SD TANAKA S TARAS P TAREM S TEUSCHER R THIERGEN M THOMSON MA VONTORNE E TOWERS S TRIGGER I 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 WOLF G WYATT TR YAMASHITA S YEKUTIELI G ZACEK V ZERZION D
Citation
K. Ackerstaff et al., SEARCH FOR SCALAR TOP AND SCALAR BOTTOM QUARKS AT ROOT-S=170-172 GEV IN E(-) COLLISIONS()E(), Zeitschrift fur Physik. C, Particles and fields, 75(3), 1997, pp. 409-420
Citations number
49
Categorie Soggetti
Physics, Particles & Fields
Journal title
Zeitschrift fur Physik. C, Particles and fields → ACNP
ISSN journal
01709739
Volume
75
Issue
3
Year of publication
1997
Pages
409 - 420
Database
ISI
SICI code
0170-9739(1997)75:3<409:SFSTAS>2.0.ZU;2-S
Abstract
A search for a scalar top quark has been performed using a total data sample of 10.4 pb(-1) at centre-of-mass energies of root s=170 and 172 GeV collected with the OPAL detector at LEP. No candidate events were observed. Combining this result with those obtained at root s = 130, 136 y and 161 GeV, the 95% C.L. lower limit on the scalar top quark ma ss is 66.8 GeV, if the mixing angle between the supersymmetric partner s of the left- and right-handed states of the top quark is smaller tha n pi/4. If the mixing angle is zero, the limit is 73.3 GeV. These limi ts were obtained assuming that the scalar top quark decays into a char m quark and the lightest neutralino, and that the mass difference betw een the scalar top quark and the lightest neutralino is larger than 10 GeV. The complementary decay mode of the scalar top quark in which it decays into a bottom quark, a changed lepton and a scalar neutrino wa s also studied. From a similar analysis, a mass limit on the light sca lar bottom quark was set at 69.7 GeV, for a mixing angle between the s upersymmetric partners of the left- and right-handed states of the bot tom quark of zero, and the mass difference between the scalar bottom q uark and the lightest neutralino larger than 8 GeV.