A SEARCH FOR LEPTOQUARKS AT HERA

Authors
AID S ANDREEV V ANDRIEU B APPUHN RD ARPAGAUS M BABAEV A BAHR J BAN J BAN Y BARANOV P BARRELET E BARSCHKE R BARTEL W BARTH M BASSLER U BECK HP BEHREND HJ BELOUSOV A BERGER C BERNARDI G BERNET R BERTRANDCOREMANS G BESANCON M BEYER R BIDDULPH P BISPHAM P BIZOT JC BLOBEL V BORRAS K BOTTERWECK F BOUDRY V BRAEMER A BRAUNSCHWEIG W BRISSON V BRUNCKO D BRUNE C BUCHOLZ R BUNGENER L BURGER J BUSSER FW BUNIATIAN A BURKE S BURTON MJ BUSCHHORN G CAMPBELL AJ CARLI T CHARLES F CHARLET M CLARKE D CLEGG AB CLERBAUX B COCKS S CONTRERAS JG CORMACK C COUGHLAN JA COURAU A COUSINOU MC COUTURES C COZZIKA G CRIEGEE L CUSSANS DG CVACH J DAGORET S DAINTON JB DAU WD DAUM K DAVID M DAVIS CL DELCOURT B DELBUONO L DEROECK A DEWOLF EA DIRKMANN M DIXON P DINEZZA P DLUGOSZ W DOLLFUS C DOWELL JD DREIS HB DROUTSKOI A DUBOC J DULLMANN D DUNGER O DUHM H EBERT J EBERT TR ECKERLIN G EFREMENKO V EGLI S EICHLER R EISELE F EISENHANDLER E ELLISON RJ ELSEN E ERDMANN M ERDMANN W EVRARD E FAHR AB FAVART L FEDOTOV A FEEKEN D FELST R FELTESSE J FERENCEI J FERRAROTTO F FLAMM K FLEISCHER M FLIESER M FLUGGE G FOMENKO A FOMINYKH B FORBUSH M FORMANEK J FOSTER JM FRANKE G FRETWURST E GABATHULER E GABATHULER K GAEDE F GARVEY J GAYLER J GEBAUER M GELLRICH A GENZEL H GERHARDS R GLAZOV A GOERLACH U GOERLICH L GOGITIDZE N GOLDBERG M GOLDNER D GOLECBIERNAT K GONZALEZPINEIRO B GORELOV I GRAB C GRASSLER H GRASSLER R GREENSHAW T GRIFFITHS R GRINDHAMMER G GRUBER A GRUBER C HAACK J HAIDT D HAJDUK L HAMON O HAMPEL M HAPKE M HAYNES WJ HEINZELMANN G HENDERSON RCW HENSCHEL H HERYNEK I HESS MF HILDESHEIM W HILLER KH HILTON CD HLADKY J HOEGER KC HOPPNER M HOFFMANN D HOLTOM T HORISBERGER R HUDGSON VL HUTTE M HUFNAGEL H IBBOTSON M ITTERBECK H JABIOL MA JACHOLKOWSKA A JACOBSSON C JAFFRE M JANOTH J JANSEN T JONSSON L JOHANNSEN K JOHNSON DP JOHNSON L JUNG H KALMUS PIP KANDER M KANT D KASCHOWITZ R KATHAGE U KATZY J KAUFMANN HH KAZARIAN S KENYON IR KERMICHE S KEUKER C KIESLING C KLEIN M KLEINWORT C KNIES G KO W KOHLER T KOHNE JH KOLANOSKI H KOLE F KOLYA SD KORBEL V KORN M KOSTKA P KOTELNIKOV SK KRAMERKAMPER T KRASNY MW KREHBIEL H KRUCKER D KRUGER U KRUNERMARQUIS U KUSTER H KUHLEN M KURCA T KURZHOFER J LACOUR D LAFORGE B LAMARCHE F LANDER R LANDON MPJ LANGE W LANGENEGGER U LANIUS P LAPORTE JF LEBEDEV A LEHNER F LEVERENZ C LEVONIAN S LEY C LINDSTROM G LINDSTROEM M LINK J LINSEL F LIPINSKI J LIST B LOBO G LOCH P LOHMANDER H LOMAS JW LOPEZ GC LUBIMOV V LUKE D MAGNUSSEN N MALINOVSKI E MANI S MARACEK R MARAGE P MARKS J MARSHALL R MARTENS J MARTIN G MARTIN R MARTYN HU MARTYNIAK J MASSON S MAVROIDIS T MAXFIELD SJ MCMAHON SJ MEHTA A MEIER K MERZ T MEYER A MEYER A MEYER H MEYER J MEYER PO MIGLIORI A MIKOCKI S MILSTEAD D MOECK J MOREAU F MORRIS JV MULLER G MULLER K MURIN P NAGOVIZIN V NAHNHAUER R NAROSKA B NAUMANN T NEWMAN PR NEWTON D NEYRET D NGUYEN HK NICHOLLS TC NIEBERGALL F NIEBUHR C NIEDZBALLA C NIGGLI H NISIUS R NOWAK G NOYES GW NYBERGWERTHER M OAKDEN M OBERLACK H OBROCK U OLSSON JE OZEROV D PALMEN P PANARO E PANITCH A PASCAUD C PATEL GD PAWLETTA H PEPPEL E PEREZ E PHILLIPS JP PIEUCHOT A PITZL D POPE G PRELL S PROSI R RABBERTZ K RADEL G RAUPACH F REIMER P REINSHAGEN S RICK H RIECH V RIEDLBERGER J RIEPENHAUSEN F RIESS S RIETZ M RIZVI E ROBERTSON SM ROBMANN P ROLOFF HE ROOSEN R ROSENBAUER K ROSTOVTSEV A ROUSE F ROYON C RUTER K RUSAKOV S RYBICKI K SAHLMANN N SANKEY DPC SCHACHT P SCHIEK S SCHLEIF S SCHLEPER P VONSCHLIPPE W SCHMIDT D SCHMIDT G SCHONING A SCHRODER V SCHUHMANN E SCHWAB B SEFKOW F SEIDEL M SELL R SEMENOV A SHEKELYAN V SHEVIAKOV I SHTARKOV LN SIEGMON G SIEWERT U SIROIS Y SKILLICORN IO SMIRNOV P SMITH JR SOLOCHENKO V SOLOVIEV Y SPECKA A SPIEKERMANN J SPIELMAN S SPITZER H SQUINABOL F STAROSTA R STEENBOCK M STOLZE K STRAUMANN U STRUCZINSKI W SUTTON JP TAPPROGGE S TASEVSKY M TCHERNYSHOV V TCHETCHELNITSKI S THEISSEN J THIEBAUX C THOMPSON G TRUOL P TURNAU J TUTAS J UELKES P USIK A VALKAR S VALKAROVA A VALLEE C VANDENPLAS D VANESCH P VANMECHELEN P VAZDIK Y VERRECCHIA P VILLET G WACKER K WAGENER A WAGENER M WALTHER A WAUGH B WEBER G WEBER M WEGENER D WEGNER A WELLISCH HP WEST LR WILKSEN T WILLARD S WINDE M WINTER GG WITTEK C WUNSCH E YIOU TP ZACEK J ZARBOCK D ZHANG Z ZHOKIN A ZIMMER M ZOMER F ZSEMBERY J ZUBER K ZURNEDDEN M
Citation
S. Aid et al., A SEARCH FOR LEPTOQUARKS AT HERA, Physics letters. Section B, 369(2), 1996, pp. 173-185
Citations number
30
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
369
Issue
2
Year of publication
1996
Pages
173 - 185
Database
ISI
SICI code
0370-2693(1996)369:2<173:ASFLAH>2.0.ZU;2-3
Abstract
A search for leptoquarks at HERA was performed in H1 using 1994 e(+)p data corresponding to an integrated luminosity of about 3 pb(-1). Sing le leptoquarks were searched for in direct positron-quark fusion proce sses taking into account possible decays into lepton-quark pairs of ei ther the first, the second, or the third generation. No significant de viation from the Standard Model predictions is found in the various fi nal states studied and mass dependent exclusion limits are derived on the Yukawa couplings of the leptoquarks. Compared with earlier results from an analysis of e(-)p data, exclusion limits are considerably imp roved for leptoquarks which could be produced via e(+)-valence quark f usion. For leptoquarks with lepton flavour conserving couplings, masse s up to 275 GeV (depending on the leptoquark type) are excluded for co upling values larger than root 4 pi alpha(cm). For leptoquarks with le pton flavour violating couplings, masses up to 225 GeV are excluded fo r couplings with leptons of the second or third generation larger than root 4 pi alpha(em). Fourteen possible combinations of couplings are studied and stringent exclusion limits comparable or better than any e xisting direct or indirect limits are obtained for each leptoquark typ e.