SEARCHES FOR SCALAR TOP AND SCALAR BOTTOM QUARKS AT LEP2

Authors
BARATE R BUSKULIC D DECAMP D GHEZ P GOY C LEES JP LUCOTTE A MINARD MN NIEF JY PIETRZYK B CASADO MP CHMEISSANI M COMAS P CRESPO JM DELFINO M FERNANDEZ E FERNANDEZBOSMAN M GARRIDO L JUSTE A MARTINEZ M MERINO G MIQUEL R MIR LM PADILLA C PARK IC PASCUAL A PERLAS JA RIU I SANCHEZ F TEUBERT F COLALEO A CREANZA D DEPALMA M GELAO G IASELLI G MAGGI G MAGGI M MARINELLI N NUZZO S RANIERI A RASO G RUGGIERI F SELVAGGI G SILVESTRIS L TEMPESTA P TRICOMI A ZITO G HUANG X LIN J OUYANG Q WANG T XIE Y XU R XUE S ZHANG J ZHANG L ZHAO W ABBANEO D ALEMANY R BAZARKO AO BECKER U BRIGHTTHOMAS P CATTANEO M CERUTTI F DISSERTORI G DREVERMANN H FORTY RW FRANK M HAGELBERG R HANSEN JB HARVEY J JANOT P JOST B KNERINGER E KNOBLOCH J LEHRAUS I MATO P MINTEN A MONETA L PACHECO A PUSZTASZERI JF RANJARD F RIZZO G ROLANDI L ROUSSEAU D SCHLATTER D SCHMITT M SCHNEIDER O TEJESSY W TOMALIN IR WACHSMUTH H WAGNER A AJALTOUNI Z BARRES A BOYER C FALVARD A FERDI C GAY P GUICHENEY C HENRARD P JOUSSET J MICHEL B MONTEIL S MONTRET JC PALLIN D PERRET P PODLYSKI F PRORIOL J ROSNET P ROSSIGNOL JM FEARNLEY T HANSEN JD HANSEN JR HANSEN PH NILSSON BS RENSCH B WAANANEN A DASKALAKIS G KYRIAKIS A MARKOU C SIMOPOULOU E VAYAKI A BLONDEL A BRIENT JC MACHEFERT F ROUGE A RUMPF M VALASSI A VIDEAU H FOCARDI E PARRINI G ZACHARIADOU K CAVANAUGH R CORDEN M GEORGIOPOULOS C HUEHN T JAFFE DE ANTONELLI A BENCIVENNI G BOLOGNA G BOSSI F CAMPANA P CAPON G CASPER D CHIARELLA V FELICI G LAURELLI P MANNOCCHI G MURTAS F MURTAS GP PASSALACQUA L PEPEALTARELLI M CURTIS L DORRIS SJ HALLEY AW KNOWLES IG LYNCH JG OSHEA V RAINE C SCARR JM SMITH K TEIXEIRADIAS P THOMPSON AS THOMSON E THOMSON F TURNBULL RM BUCHMULLER O DHAMOTHARAN S GEWENIGER C GRAEFE G HANKE P HANSPER G HEPP V KLUGE EE PUTZER A SOMMER J TITTEL K WERNER S WUNSCH M BEUSELINCK R BINNIE DM CAMERON W DORNAN PJ GIORNE M GOODSIR S MARTIN EB MORAWITZ P MOUTOUSSI A NASH J SEDGBEER JK SPAGNOLO P STACEY AM WILLIAMS MD GHETE VM GIRTLER P KUHN D RUDOLPH G BETTERIDGE AP BOWDERY CK COLRAIN P CRAWFORD G FINCH AJ FOSTER F HUGHES G JONES RWL SLOAN T WHELAN EP WILLIAMS MI HOFFMANN C JAKOBS K KLEINKNECHT K QUAST G RENK B ROHNE E SANDER HG VANGEMMEREN P ZEITNITZ C AUBERT JJ BENCHOUK C BONISSENT A BUJOSA G CARR J COYLE P DIACONU C EALET A FOUCHEZ D KONSTANTINIDIS N LEROY O MOTSCH F PAYRE P TALBY M SADOUKI A THULASIDAS M TILQUIN A TRABELSI K ALEPPO M ANTONELLI M RAGUSA F BERLICH R BLUM W BUSCHER V DIETL H GANIS G GOTZHEIN C KROHA H LUTJENS G LUTZ G MANNER W MOSER HG RICHTER R ROSADOSCHLOSSER A SCHAEL S SETTLES R SEYWERD H STDENIS R STENZEL H WIEDENMANN W WOLF G BOUCROT J CALLOT O CHEN S CORDIER A DAVIER M DUFLOT L GRIVAZ JF HEUSSE P HOCKER A JACHOLKOWSKA A JACQUET M KIM DW LEDIBERDER F LEFRANCOIS J LUTZ AM NIKOLIC I SCHUNE MH SERIN L SIMION S TOURNEFIER E VEILLET JJ VIDEAU I ZERWAS D AZZURRI P BAGLIESI G BETTARINI S BOZZI C CALDERINI G CIULLI V DELLORSO R FANTECHI R FERRANTE I GIASSI A GREGORIO A LIGABUE F LUSIANI A MARROCCHESI PS MESSINEO A PALLA F SANGUINETTI G SCIABA A SGUAZZONI G STEINBERGER J TENCHINI R VANNINI C VENTURI A VERDINI PG BLAIR GA BRYANT LM CHAMBERS JT GAO Y GREEN MG MEDCALF T PERRODO P STRONG JA VONWIMMERSPERGTOELLER JH BOTTERILL DR CLIFFT RW EDGECOCK TR HAYWOOD S MALEY P NORTON PR THOMPSON JC WRIGHT AE BLOCHDEVAUX B COLAS P FABBRO B KOZANECKI W LANCON E LEMAIRE MC LOCCI E PEREZ P RANDER J RENARDY JF ROSOWSKY A ROUSSARIE A SCHULLER JP SCHWINDLING J TRABELSI A VALLAGE B BLACK SN DANN JH KIM HY LITKE AM MCNEIL MA TAYLOR G BOOTH CN BOSWELL R BREW CAJ CARTWRIGHT S COMBLEY F KELLY MS LEHTO M NEWTON WM REEVE J THOMPSON LF AFFHOLDERBACH K BOHRER A BRANDT S COWAN G FOSS J GRUPEN C LUTTERS G SARAIVA P SMOLIK L STEPHAN F APOLLONIO M BOSISIO L DELLAMARINA R GIANNINI G GOBBO B MUSOLINO G PUTZ J ROTHBERG J WASSERBAECH S WILLIAMS RW ARMSTRONG SR CHARLES E ELMER P FERGUSON DPS GONZALEZ S GREENING TC HAYES OJ HU H JIN S MCNAMARA PA NACHTMAN JM NIELSEN J OREJUDOS W PAN YB SAADI Y SCOTT IJ WALSH J WU SL WU X YAMARTINO JM ZOBERNIG G
Citation
R. Barate et al., SEARCHES FOR SCALAR TOP AND SCALAR BOTTOM QUARKS AT LEP2, Physics letters. Section B, 413(3-4), 1997, pp. 431-446
Citations number
18
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
413
Issue
3-4
Year of publication
1997
Pages
431 - 446
Database
ISI
SICI code
0370-2693(1997)413:3-4<431:SFSTAS>2.0.ZU;2-J
Abstract
Searches for scalar top and bottom quarks have been performed with dat a collected by the ALEPH detector at LEP. The data sample consists of 21.7 pb(-1) taken at root s = 161, 170, and 172 GeV and 5.7 pb(-1) tak en at root s = 130 and 136 GeV. No evidence for scalar top quarks or s calar bottom quarks was found in the channels (t) over tilde --> c chi , (t) over tilde --> bl<(nu)over tilde>, and (b) over tilde --> b chi. For the channel (t) over tilde --> c chi a limit of 67 GeV/c(2) has b een set on the scalar top quark mass, independent of the mixing angle between the supersymmetric partners of the left and right-handed state s of the top quark. This limit assumes a mass difference between the ( t) over tilde and the chi of at least 10 GeV/c(2). For the channel (t) over tilde --> bl<(nu)over tilde> the mixing-angle independent scalar top limit is 70 GeV/c(2), assuming a mass difference between the (t) over tilde and the <(nu)over tilde> of at least 10 GeV/c(2). For the c hannel (b) over tilde --> b chi, a limit of 73 GeV/c(2) has been set o n the mass of the supersymmetric partner of the left-handed state of t he bottom quark. This limit is valid if the mass difference between th e (b) over tilde and the chi is at least 10 GeV/c(2). (C) 1997 Elsevie r Science B.V.