SEARCH FOR SCALAR TOP AND SCALAR BOTTOM QUARKS USING THE OPAL DETECTOR AT LEP

Authors
ACKERSTAFF K ALEXANDER G ALLISON J ALTEKAMP N AMETEWEE K ANDERSON KJ ANDERSON S ARCELLI S ASAI S AXEN D AZUELOS G BALL AH BARBERIO E BARLOW RJ BARTOLDUS R BATLEY JR BECHTLUFT J BEESTON C BEHNKE T BELL AN BELL KW BELLA G BENTVELSEN S BERLICH P BETHKE S BIEBEL O BLOBEL V BLOODWORTH IJ BLOOMER JE BOBINSKI I BOCK P BOSCH HM BOUTEMEUR M BOUWENS BT BRAIBANT S BROWN RM BURCKHARTH 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 DEJONGE S DELPOZO LA DESCH K DIXIT MS SILVA ED DOUCET M DUCHOVNI E DUCKECK G DUERDOTH IP EDWARDS JEG ESTABROOKS PG EVANS HG EVANS M FABBRI F FATH P FIEDLER F FIERRO M FISCHER HM FOLMAN R FONG DG FOUCHER M FURTJES A GAGNON P GARY JW GASCON J GASCONSHOTKIN SM GEDDES NI GEICHGIMBEL C GERALIS T GIACOMELLI G GIACOMELLI P GIACOMELLI R GIBSON V GIBSON W 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 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 HUGHESJONES RE 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 JONES RWL JOST U JOVANOVIC P JUNK TR KARLEN D KAWAGOE K KAWAMOTO T KEELER RK KELLOGG RG KENNEDY BW KING BJ KIRK J 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 LEWIS C LLOYD SL LOEBINGER FK LONG GD LOSTY MJ LUDWIG J MANNELLI M MARCELLINI S MARKUS C MARTIN AJ MARTIN JP MARTINEZ G MASHIMO T MATTHEWS W MATTIG P MCDONALD WJ MCKENNA J MCKIGNEY EA MCMAHON TJ MCNAB AI MCPHERSON RA MEIJERS F MENKE S MERRITT FS MES H MEYER J MICHELINI A MIKENBERG G MILLER DJ MIR R MOHR W MONTANARI A MORI T MORII M MULLER U NAGAI K NAKAMURA I NEAL HA NELLEN B NIJJHAR B NISIUS R ONEALE SW OAKHAM FG ODORICI F OGREN HO OLDERSHAW NJ OMORI T OREGLIA MJ ORITO S 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 SARKISYAN EKG SASAKI M SBARRA C SCHAILE AD SCHAILE O SCHARF F SCHARFFHANSEN P SCHENK P SCHMITT B SCHMITT S SCHRODER M SCHULTZCOULON HC SCHULZ M SCHUMACHER M SCHUTZ P SCOTT WG SHEARS TG SHEN BC SHEPHARDTHEMISTOCLEOUS CH SHERWOOD P SIROLI GP SITTLER A SKILLMAN A SKUJA A SMITH AM SMITH TJ SNOW GA SOBIE R SOLDNERREMBOLD S SPRINGER RW SPROSTON M STAHL A STEIERT M STEPHENS K STEUERER J STOCKHAUSEN B STROM D STRUMIA F SZYMANSKI P TAFIROUT R TALBOT SD TANAKA S TARAS P TAREM S THIERGEN M THOMSON MA VONTORNE E TOWERS S TRIGGER I TSUKAMOTO T TSUR E TURCOT AS TURNERWATSON MF UTZAT P VANKOOTEN R VERZOCCHI M VIKAS P VINCTER M VOKURKA EH WACKERLE F WAGNER A WARD CP WARD DR WARD JJ WATKINS PM WATSON AT WATSON NK WELLS PS WERMES N WHITE JS WILKENS B WILSON GW WILSON JA WOLF G WOTTON S WYATT TR YAMASHITA S YEKUTIELI G ZACEK V
Citation
K. Ackerstaff et al., SEARCH FOR SCALAR TOP AND SCALAR BOTTOM QUARKS USING THE OPAL DETECTOR AT LEP, Physics letters. Section B, 389(1), 1996, pp. 197-210
Citations number
44
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
389
Issue
1
Year of publication
1996
Pages
197 - 210
Database
ISI
SICI code
0370-2693(1996)389:1<197:SFSTAS>2.0.ZU;2-D
Abstract
The scalar top quark can be the Lightest charged supersymmetric partic le and it can be lighter than the top quark itself in supersymmetric e xtensions of the Standard Model. A search for a scalar top quark has b een performed using a total data sample of 15.2 pb(-1) at centre-of-ma ss energies of root s=130, 136, and 161 GeV collected with the OPAL de tector at LEP. No evidence was found above the background level expect ed from the Standard Model, The 95% C.L. lower limit on the scalar top quark mass is 58.7 GeV, if the mixing angle between the supersymmetri c partners of the left- and right-handed states of the top quark is sm aller than pi/4. If the mixing angle is zero, the limit is 65.4 GeV, T hese limits were obtained on the condition that the scalar top quark d ecays into a charm quark and the lightest neutralino, and that the mas s difference between the scalar top quark and the lightest neutralino is larger than 10 GeV. Assuming a relatively light scalar neutrino, we also studied the complementary decay mode of the scalar top quark in which it decays into a bottom quark, a charged lepton, and a scalar ne utrino, A mass limit on the light scalar bottom quark was also set in this study.