Search for Light Top Squarks in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">p</mml:mi><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: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:math>TeV
S. AbachiFermi National Accelerator Laboratory, Batavia, Illinois 60510Braden Keim AbbottNew York University, New York, New York 10003M. AbolinsMichigan State University, East Lansing, Michigan 48824B. S. AcharyaTata Institute of Fundamental Research, Colaba, Bombay 400005, IndiaИ. АдамColumbia University, New York, New York 10027D. L. AdamsRice University, Houston, Texas 77251Mark Raymond AdamsUniversity of Illinois at Chicago, Chicago, Illinois 60607S. AhnFermi National Accelerator Laboratory, Batavia, Illinois 60510H. AiharaLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720J. AlittiCommissariat à l'Energie Atomique, DAPNIA/Service de Physique des Particules, Centre d'Etudes de Saclay, Saclay, FranceG. ÁlvarezIndiana University, Bloomington, Indiana 47405G. A. AlvesLAFEX, Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, BrazilE. AmidiNortheastern University, Boston, Massachusetts 02115N. AmosUniversity of Michigan, Ann Arbor, Michigan 48109E. W. AndersonIowa State University, Ames, Iowa 50011S. H. AronsonBrookhaven National Laboratory, Upton, New York 11973R. AsturState University of New York, Stony Brook, New York 11794R. E. AveryNorthwestern University, Evanston, Illinois 60208A. BadenUniversity of Maryland, College Park, Maryland 20742V. BalamuraliUniversity of Notre Dame, Notre Dame, Indiana 46556J. BalderstonUniversity of Hawaii, Honolulu, Hawaii 96822B. BaldinFermi National Accelerator Laboratory, Batavia, Illinois 60510J. BantlyBrown University, Providence, Rhode Island 02912J. F. BartlettFermi National Accelerator Laboratory, Batavia, Illinois 60510K. BaziziUniversity of Rochester, Rochester, New York 14627J. BendichLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720S. B. BeriUniversity of Panjab, Chandigarh 16-00-14, IndiaI. A. BertramRice University, Houston, Texas 77251V. A. BezzubovInstitute for High Energy Physics, 142-284 Protvino, RussiaP. C. BhatFermi National Accelerator Laboratory, Batavia, Illinois 60510V. BhatnagarUniversity of Panjab, Chandigarh 16-00-14, IndiaM. BhattacharjeeDelhi University, Delhi, India 110007A. BischoffUniversity of California, Riverside, California 92521N. N. BiswasUniversity of Notre Dame, Notre Dame, Indiana 46556G. BlazeyFermi National Accelerator Laboratory, Batavia, Illinois 60510S. BlessingFlorida State University, Tallahassee, Florida 32306P. C. BloomUniversity of California, Davis, California 95616A. BoehnleinFermi National Accelerator Laboratory, Batavia, Illinois 60510N. I. BojkoInstitute for High Energy Physics, 142-284 Protvino, RussiaF. BorcherdingFermi National Accelerator Laboratory, Batavia, Illinois 60510J. BordersUniversity of Rochester, Rochester, New York 14627C. BoswellUniversity of California, Riverside, California 92521A. BrandtFermi National Accelerator Laboratory, Batavia, Illinois 60510R. BrockMichigan State University, East Lansing, Michigan 48824A. BrossFermi National Accelerator Laboratory, Batavia, Illinois 60510D. BuchholzNorthwestern University, Evanston, Illinois 60208В. С. БуртовойInstitute for High Energy Physics, 142-284 Protvino, RussiaJ. M. ButlerW. CarvalhoLAFEX, Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, BrazilD. CaseyUniversity of Rochester, Rochester, New York 14627H. Castilla-ValdezCentro de Investigacion y de Estudios Avanzados, Mexico City, MexicoD. ChakrabortyState University of New York, Stony Brook, New York 11794S.-M. ChangNortheastern University, Boston, Massachusetts 02115S. V. ChekulaevInstitute for High Energy Physics, 142-284 Protvino, RussiaL.-P. ChenLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720W. ChenState University of New York, Stony Brook, New York 11794S. ChopraUniversity of Panjab, Chandigarh 16-00-14, IndiaB. C. ChoudharyUniversity of California, Riverside, California 92521J. H. ChristensonFermi National Accelerator Laboratory, Batavia, Illinois 60510M. ChungUniversity of Illinois at Chicago, Chicago, Illinois 60607D. R. ClaesState University of New York, Stony Brook, New York 11794A. 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 92521W. E. CooperFermi National Accelerator Laboratory, Batavia, Illinois 60510C. CretsingerUniversity of Rochester, Rochester, New York 14627D. Cullen-VidalBrown University, Providence, Rhode Island 02912M.A.C. CummingsUniversity of Hawaii, Honolulu, Hawaii 96822D. CuttsBrown University, Providence, Rhode Island 02912O. I. DahlLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720K. DeUniversity of Texas, Arlington, Texas 76019M. DemarteauFermi National Accelerator Laboratory, Batavia, Illinois 60510R. DeminaNortheastern University, Boston, Massachusetts 02115K. DenisenkoFermi National Accelerator Laboratory, Batavia, Illinois 60510N. DenisenkoFermi National Accelerator Laboratory, Batavia, Illinois 60510D. DenisovFermi National Accelerator Laboratory, Batavia, Illinois 60510S. P. DenisovInstitute for High Energy Physics, 142-284 Protvino, RussiaH. T. DiehlFermi National Accelerator Laboratory, Batavia, Illinois 60510M. DiesburgFermi National Accelerator Laboratory, Batavia, Illinois 60510G. Di LoretoMichigan State University, East Lansing, Michigan 48824R. DixonFermi National Accelerator Laboratory, Batavia, Illinois 60510P. DraperUniversity of Texas, Arlington, Texas 76019J. DrinkardUniversity of California, Irvine, California 92717Y. DucrosCommissariat à l'Energie Atomique, DAPNIA/Service de Physique des Particules, Centre d'Etudes de Saclay, Saclay, FranceS. R. DugadTata Institute of Fundamental Research, Colaba, Bombay 400005, IndiaS. D. JohnsonUniversity of Rochester, Rochester, New York 14627D. EdmundsMichigan State University, East Lansing, Michigan 48824J. EllisonUniversity of California, Riverside, California 92521V. D. ElviraUniversidad de Buenos Aires, Buenos Aires, ArgentinaR. EngelmannState University of New York, Stony Brook, New York 11794S. C. EnoUniversity of Maryland, College Park, Maryland 20742G. EppleyRice University, Houston, Texas 77251P. ErmolovMoscow State University, Moscow, RussiaO. V. EroshinInstitute for High Energy Physics, 142-284 Protvino, RussiaВ. Н. ЕвдокимовInstitute for High Energy Physics, 142-284 Protvino, RussiaS. FaheyMichigan State University, East Lansing, Michigan 48824T. FahlandBrown University, Providence, Rhode Island 02912M. FatygaBrookhaven National Laboratory, Upton, New York 11973M. FatygaBrookhaven National Laboratory, Upton, New York 11973J. FeatherlyBrookhaven National Laboratory, Upton, New York 11973
1996lv
ABI
Аннотация
We present a search for pair produced top squarks, the supersymmetric partners of the top quark, using the D0 detector at the Fermilab Tevatron $p\overline{p}$ collider. We consider a scenario in which the lighter of the two top squarks ${\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{t}}_{1}$ decays with 100% branching fraction to a charm quark and the lightest neutralino ${\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\chi}}}_{1}^{0}$ yielding a signal of two acollinear jets with missing transverse energy. We observe 3 events while we expect $3.5\ifmmode\pm\else\textpm\fi{}1.2$ events from the known standard model processes. We exclude at the 95% confidence level a significant region of the ${m}_{{\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{t}}_{1}}$- ${m}_{{\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\chi}}}_{1}^{0}}$ parameter space. The highest ${m}_{{\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{t}}_{1}}$ value we exclude is $93\mathrm{GeV}{/c}^{2}$ with a corresponding ${m}_{{\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\chi}}}_{1}^{0}}$ value of $8\mathrm{G}\mathrm{e}\mathrm{V}/{c}^{2}$.
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