Search for Second-Generation Leptoquark Pairs in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mi mathvariant="italic">p</mml:mi></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>√</mml:mi><mml:mi mathvariant="italic">s</mml:mi><mml:mspace/><mml:mo>=</mml:mo><mml:mspace/><mml:mn>1.8</mml:mn><mml:mn/><mml:mi/><mml:mi>TeV</mml:mi></mml:math>
Braden Keim AbbottNew York University, New York, New York 10003M. AbolinsMichigan State University, East Lansing, Michigan 48824V. AbramovInstitute for High Energy Physics, Protvino, RussiaB. S. AcharyaTata Institute of Fundamental Research, Mumbai, IndiaD. L. AdamsUniversity of Texas, Arlington, Texas 76019M. AdamsUniversity of Illinois at Chicago, Chicago, Illinois 60607S. AhnFermi National Accelerator Laboratory, Batavia, Illinois 60510V. AkimovInstitute for Theoretical and Experimental Physics, Moscow, RussiaG. A. AlvesLAFEX, Centro Brasileiro de Pesquisas Fsicas, Rio de Janeiro, BrazilN. AmosUniversity of Michigan, Ann Arbor, Michigan 48109E. W. AndersonIowa State University, Ames, Iowa 50011M. M. BaarmandState University of New York, Stony Brook, New York 11794V. V. BabintsevInstitute for High Energy Physics, Protvino, RussiaL. BabukhadiaState University of New York, Stony Brook, New York 11794A. BadenUniversity of Maryland, College Park, Maryland 20742B. BaldinFermi National Accelerator Laboratory, Batavia, Illinois 60510S. BanerjeeTata Institute of Fundamental Research, Mumbai, IndiaJ. BantlyBrown University, Providence, Rhode Island 02912E. BarberisLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720P. BaringerUniversity of Kansas, Lawrence, Kansas 66045J. F. BartlettFermi National Accelerator Laboratory, Batavia, Illinois 60510U. BasslerLPNHE, Universits Paris VI and VII, IN2P3-CNRS, Paris, FranceA. BelyaevMoscow State University, Moscow, RussiaS. B. BeriPanjab University, Chandigarh, IndiaG. BernardiSorbonne UniversitéI. BertramLancaster University, Lancaster, United KingdomV. A. BezzubovInstitute for High Energy Physics, Protvino, RussiaP. C. BhatFermi National Accelerator Laboratory, Batavia, Illinois 60510V. BhatnagarPanjab University, Chandigarh, IndiaM. BhattacharjeeState University of New York, Stony Brook, New York 11794G. BlazeyS. BlessingFlorida State University, Tallahassee, Florida 32306A. BoehnleinFermi National Accelerator Laboratory, Batavia, Illinois 60510N. I. BojkoInstitute for High Energy Physics, Protvino, RussiaF. BorcherdingFermi National Accelerator Laboratory, Batavia, Illinois 60510A. BrandtUniversity of Texas, Arlington, Texas 76019R. BreedonUniversity of California, Davis, California 95616G. BriskinBrown University, Providence, Rhode Island 02912R. BrockMichigan State University, East Lansing, Michigan 48824G. BrooijmansFermi National Accelerator Laboratory, Batavia, Illinois 60510A. BrossFermi National Accelerator Laboratory, Batavia, Illinois 60510D. BuchholzNorthwestern University, Evanston, Illinois 60208V. S. BurtovoiInstitute for High Energy Physics, Protvino, RussiaJ. M. ButlerW. CarvalhoUniversidade do Estado do Rio de Janeiro, Rio de Janeiro, BrazilD. CaseyMichigan State University, East Lansing, Michigan 48824Z. CasilumState University of New York, Stony Brook, New York 11794H. Castilla-ValdezCINVESTAV, Mexico City, MexicoD. ChakrabortyState University of New York, Stony Brook, New York 11794K. M. ChanUniversity of Rochester, Rochester, New York 14627S. V. ChekulaevInstitute for High Energy Physics, Protvino, RussiaW. ChenState University of New York, Stony Brook, New York 11794D. K. ChoUniversity of Rochester, Rochester, New York 14627S. ChoiUniversity of California, Riverside, California 92521S. ChopraFlorida State University, Tallahassee, Florida 32306B. C. ChoudharyUniversity of California, Riverside, California 92521J. H. ChristensonFermi National Accelerator Laboratory, Batavia, Illinois 60510M. ChungUniversity of Illinois at Chicago, Chicago, Illinois 60607D. ClaesUniversity of Nebraska, Lincoln, Nebraska 68588A. R. ClarkLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720W. G. CobauUniversity of Maryland, College Park, Maryland 20742J. CochranUniversity of California, Riverside, California 92521L. ConeyUniversity of Notre Dame, Notre Dame, Indiana 46556B. ConnollyFlorida State University, Tallahassee, Florida 32306W. E. CooperFermi National Accelerator Laboratory, Batavia, Illinois 60510D. CoppageUniversity of Kansas, Lawrence, Kansas 66045D. Cullen-VidalBrown University, Providence, Rhode Island 02912M. A. C. CummingsNorthern Illinois University, DeKalb, Illinois 60115D. CuttsBrown University, Providence, Rhode Island 02912O. I. DahlLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720K. DavisUniversity of Arizona, Tucson, Arisona 85721K. DeUniversity of Texas, Arlington, Texas 76019K. Del SignoreM. DemarteauFermi National Accelerator Laboratory, Batavia, Illinois 60510D. DenisovFermi National Accelerator Laboratory, Batavia, Illinois 60510S. P. DenisovInstitute for High Energy Physics, Protvino, RussiaH. T. DiehlFermi National Accelerator Laboratory, Batavia, Illinois 60510M. DiesburgFermi National Accelerator Laboratory, Batavia, Illinois 60510G. Di LoretoP. DraperUniversity of Texas, Arlington, Texas 76019Y. DucrosDAPNIA/Service de Physique des Particules, CEA, Saclay, FranceL. V. DudkoMoscow State University, Moscow, RussiaS. R. DugadTata Institute of Fundamental Research, Mumbai, IndiaA. DyshkantInstitute for High Energy Physics, Protvino, RussiaD. EdmundsMichigan State University, East Lansing, Michigan 48824J. EllisonUniversity of California, Riverside, California 92521V. D. ElviraState University of New York, Stony Brook, New York 11794R. EngelmannState University of New York, Stony Brook, New York 11794S. EnoUniversity of Maryland, College Park, Maryland 20742G. EppleyRice University, Houston, Texas 77005P. ErmolovMoscow State University, Moscow, RussiaO. V. EroshinInstitute for High Energy Physics, Protvino, RussiaJ. EstradaUniversity of Rochester, Rochester, New York 14627H. EvansColumbia University, New York, New York 10027V. N. EvdokimovInstitute for High Energy Physics, Protvino, RussiaT. FahlandUniversity of California, Irvine, California 92697M. K. FatygaUniversity of Rochester, Rochester, New York 14627S. FeherFermi National Accelerator Laboratory, Batavia, Illinois 60510D. FeinUniversity of Arizona, Tucson, Arisona 85721T. FerbelUniversity of Rochester, Rochester, New York 14627
ABI
Abstract
We have searched for second-generation leptoquark (LQ) pairs in the $\ensuremath{\mu}\ensuremath{\mu}+\mathrm{jets}$ channel using $94\ifmmode\pm\else\textpm\fi{}5{\mathrm{pb}}^{\ensuremath{-}1}$ of $\overline{p}p$ collider data collected by the D0 experiment at the Fermilab Tevatron during 1993--1996. No evidence for a signal is observed. These results are combined with those from the $\ensuremath{\mu}\ensuremath{\nu}+\mathrm{jets}$ and $\ensuremath{\nu}\ensuremath{\nu}+\mathrm{jets}$ channels to obtain $95%$ confidence level (C.L.) upper limits on the LQ pair production cross section as a function of mass and $\ensuremath{\beta}$, the branching fraction of a LQ decay into a charged lepton and a quark. Lower limits of $200(180)\mathrm{GeV}{/c}^{2}$ for $\ensuremath{\beta}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1(\frac{1}{2})$ are set at the $95%$ C.L. on the mass of scalar LQ. Mass limits are also set on vector leptoquarks as a function of $\ensuremath{\beta}$.
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