Direct measurement of the top quark mass by the DØ Collaboration
Braden Keim AbbottNew York University, New York, New York 10003M. AbolinsMichigan State University, East Lansing, Michigan 48824B. S. AcharyaTata Institute of Fundamental Research, Colaba, Mumbai 400005, IndiaИ. АдамColumbia University, New York, New York 10027D. L. AdamsRice University, Houston, Texas 77005M. 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 94720G. A. AlvesLAFEX, Centro Brasileiro de Pesquisas Fsicas, Rio de Janeiro, BrazilN. AmosUniversity of Michigan, Ann Arbor, Michigan 48109E. W. AndersonIowa State University, Ames, Iowa 50011R. AsturState University of New York, Stony Brook, New York 11794M. M. BaarmandState University of New York, Stony Brook, New York 11794A. 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 60510S. BanerjeeTata Institute of Fundamental Research, Colaba, Mumbai 400005, IndiaJ. BantlyBrown University, Providence, Rhode Island 02912E. BarberisLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720J. F. BartlettFermi National Accelerator Laboratory, Batavia, Illinois 60510K. BaziziUniversity of Rochester, Rochester, New York 14627A. BelyaevMoscow State University, Moscow, RussiaS. B. BeriUniversity of Panjab, Chandigarh 16-00-14, IndiaI. A. BertramNorthwestern University, Evanston, Illinois 60208V. 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. BhattacharjeeState University of New York, Stony Brook, New York 11794N. N. BiswasUniversity of Notre Dame, Notre Dame, Indiana 46556G. BlazeyNorthern Illinois University, DeKalb, Illinois 60115S. 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 60510C. 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. ButlerBoston University, Boston, Massachusetts 02215W. CarvalhoLAFEX, Centro Brasileiro de Pesquisas Fsicas, Rio de Janeiro, BrazilD. CaseyUniversity of Rochester, Rochester, New York 14627Z. CasilumState University of New York, Stony Brook, New York 11794H. Castilla-ValdezCINVESTAV, 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. ChoiSeoul National University, Seoul, KoreaS. ChopraUniversity of Michigan, Ann Arbor, Michigan 48109B. C. ChoudharyUniversity of California, Riverside, California 92521J. H. ChristensonFermi National Accelerator Laboratory, Batavia, Illinois 60510M. ChungUniversity of Illinois at Chicago, Chicago, Illinois 60607D. R. 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 46556W. E. CooperFermi National Accelerator Laboratory, Batavia, Illinois 60510C. CretsingerUniversity of Rochester, Rochester, New York 14627D. Cullen-VidalBrown University, Providence, Rhode Island 02912M.A.C. CummingsNorthern Illinois University, DeKalb, Illinois 60115D. CuttsBrown University, Providence, United StatesO. I. DahlLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720K. DavisUniversity of Arizona, Tucson, United StatesK. DeUniversity of Texas, Arlington, Texas 76019K. Del SignoreUniversity of Michigan–Ann Arbor, Ann Arbor, United StatesM. DemarteauFermi National Accelerator Laboratory, Batavia, Illinois 60510D. DenisovFermi National Accelerator Laboratory, Batavia, United StatesS. P. DenisovInstitute for High Energy Physics, 142-284 Protvino, RussiaH. T. DiehlFermi National Accelerator Laboratory, Batavia, United StatesM. DiesburgFermi National Accelerator Laboratory, Batavia, United StatesG. Di LoretoMichigan State University, East Lansing, United StatesP. DraperThe University of Texas at Arlington, Arlington, United StatesY. DucrosCEA, DAPNIA/Service de Physique des Particules, CE-SACLAY, Gif-sur-Yvette, FranceL. DudkoMoscow State University, Moscow, RussiaS. R. DugadTata Institute of Fundamental Research, Colaba, Mumbai 400005, IndiaD. EdmundsMichigan State University, East Lansing, United StatesJ. EllisonUniversity of California, Riverside, California 92521V. D. ElviraState University of New York, Stony Brook, New York 11794R. EngelmannStony Brook University, Stony Brook, United StatesS. C. EnoUniversity of Maryland, College Park, Maryland 20742G. EppleyRice University, Houston, Texas 77005P. ErmolovLomonosov Moscow State University, Moscow, RussiaO. V. EroshinCINVESTAV, Mexico City, MexicoВ. Н. ЕвдокимовUniversidad de Buenos Aires, Buenos Aires, ArgentinaT. FahlandUniversity of California, Irvine, Irvine, United StatesM. FatygaUniversity of Rochester, Rochester, New York 14627S. FehérFermi National Accelerator Laboratory, Batavia, United StatesD. FeinUniversity of Arizona, Tucson, United StatesT. FerbelUniversity of Rochester, Rochester, United StatesG. FinocchiaroStony Brook University, Stony Brook, United StatesH. E. FiskFermi National Accelerator Laboratory, Batavia, United StatesY. FisyakUniversity of California, Davis, Davis, United StatesE. FlattumFermi National Accelerator Laboratory, Batavia, United StatesG. E. FordenUniversity of Arizona, Tucson, United States
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fieldsjournal1998en
ABI
Abstract
We determine the top quark mass ${m}_{t}$ using $t\overline{t}$ pairs produced in the D\O{} detector by $\sqrt{s}=1.8\mathrm{TeV}$ $p\overline{p}$ collisions in a $125{\mathrm{pb}}^{\ensuremath{-}1}$ exposure at the Fermilab Tevatron. We make a two constraint fit to ${m}_{t}$ in $t\overline{t}\ensuremath{\rightarrow}{\mathrm{bW}}^{+}\overline{b}{W}^{\ensuremath{-}}$ final states with one W boson decaying to $q\overline{q}$ and the other to $e\ensuremath{\nu}$ or $\ensuremath{\mu}\ensuremath{\nu}.$ Likelihood fits to the data yield ${m}_{t}(l+\mathrm{jets})=173.3\ifmmode\pm\else\textpm\fi{}5.6\mathrm{}(\mathrm{stat})\mathrm{}\ifmmode\pm\else\textpm\fi{}\mathrm{}5.5\mathrm{}(\mathrm{syst})\mathrm{ }\mathrm{GeV}{/c}^{2}.$ When this result is combined with an analysis of events in which both W bosons decay into leptons, we obtain ${m}_{t}=172.1\ifmmode\pm\else\textpm\fi{}5.2\mathrm{}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}4.9\mathrm{}(\mathrm{syst})\mathrm{ }\mathrm{GeV}{/c}^{2}.$ An alternate analysis, using three constraint fits to fixed top quark masses, gives ${m}_{t}(l+\mathrm{jets})=176.0\ifmmode\pm\else\textpm\fi{}7.9\mathrm{}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}4.8\mathrm{}(\mathrm{syst})\mathrm{ }\mathrm{GeV}{/c}^{2},$ consistent with the above result. Studies of kinematic distributions of the top quark candidates are also presented. 14.65.Ha, 13.85.Ni, 13.85.Qk
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