Статья

Extraction of the width of the<i>W</i>boson from measurements of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>σ</mml:mi><mml:mo>(</mml:mo><mml:mi>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:mo>→</mml:mo><mml:mi>W</mml:mi><mml:mo>+</mml:mo><mml:mi>X</mml:mi><mml:mo>)</mml:mo><mml:mo>×</mml:mo><mml:mi>B</mml:mi><mml:mo>(</mml:mo><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>W</mml:mi></mml:mrow><mml:mrow><mml:mo>→</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mi>e</mml:mi><mml:mi>ν</mml:mi><mml:mo>)</mml:mo></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>σ</mml:mi><mml:mo>(</mml:mo><mml:mi>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:mo>→</mml:mo><mml:mi>Z</mml:mi><mml:mo>+</mml:mo><mml:mi>X</mml:mi><mml:mo>)</mml:mo><mml:mo>×</mml:mo><mml:mi>B</mml:mi><mml:mo>(</mml:mo><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>Z</mml:mi></mml:mrow><mml:mrow><mml:mo>→</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mi>e</mml:mi><mml:mi>e</mml:mi><mml:mo>)</mml:mo></mml:math>and their ratio

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, 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 60510V. AkimovInstitute for Theoretical and Experimental Physics, Moscow, RussiaG. A. AlvesLAFEX, Centro Brasileiro de Pesquisas Físicas, 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. BabintsevInstitute for High Energy Physics, Protvino, RussiaL. BabukhadiaUniversity of Arizona, Tucson, Arizona 85721A. BadenUniversity of Maryland, College Park, Maryland 20742B. BaldinFermi National Accelerator Laboratory, Batavia, Illinois 60510Sw. 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 60510A. BelyaevMoscow State University, Moscow, RussiaS. B. BeriPanjab University, Chandigarh, IndiaI. A. 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. 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, Protvino, RussiaF. BorcherdingFermi National Accelerator Laboratory, Batavia, Illinois 60510C. BoswellUniversity of California, Riverside, California 92521A. BrandtFermi National Accelerator Laboratory, Batavia, Illinois 60510R. BreedonUniversity of California, Davis, California 95616G. BriskinBrown University, Providence, Rhode Island 02912R. 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, Protvino, RussiaJ. M. ButlerW. CarvalhoLAFEX, Centro Brasileiro de Pesquisas Físicas, 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 11794S. V. ChekulaevInstitute for High Energy Physics, Protvino, RussiaW. ChenState University of New York, Stony Brook, New York 11794S. ChoiSeoul National University, Seoul, KoreaS. 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. 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 60510D. CoppageUniversity of Kansas, Lawrence, Kansas 66045C. 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, Rhode Island 02912O. I. DahlLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720K. DavisUniversity of Arizona, Tucson, Arizona 85721K. DeUniversity of Texas, Arlington, Texas 76019K. Del SignoreUniversity of Michigan, Ann Arbor, Michigan 48109M. 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 LoretoMichigan State University, East Lansing, Michigan 48824P. DraperUniversity of Texas, Arlington, Texas 76019Y. DucrosDAPNIA/Service de Physique des Particules, CEA, Saclay, FranceL. 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. C. EnoUniversity of Maryland, College Park, Maryland 20742G. EppleyRice University, Houston, Texas 77005P. ErmolovMoscow State University, Moscow, RussiaO. V. EroshinInstitute for High Energy Physics, Protvino, RussiaH. EvansColumbia University, New York, New York 10027В. Н. ЕвдокимовInstitute for High Energy Physics, Protvino, RussiaT. FahlandUniversity of California, Irvine, California 92697M. FatygaUniversity of Rochester, Rochester, New York 14627S. FehérFermi National Accelerator Laboratory, Batavia, Illinois 60510D. FeinUniversity of Arizona, Tucson, Arizona 85721T. FerbelUniversity of Rochester, Rochester, New York 14627H. E. FiskFermi National Accelerator Laboratory, Batavia, Illinois 60510Y. FisyakBrookhaven National Laboratory, Upton, New York 11973E. FlattumFermi National Accelerator Laboratory, Batavia, Illinois 60510

2000lv

ABI

Аннотация

We report on measurements on inclusive cross sections times branching fractions into electrons for W and Z bosons produced in $p\overline{p}$ collisions at $\sqrt{s}=1.8\mathrm{TeV}.$ From an integrated luminosity of 84.5 ${\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$ recorded in 1994--1995 using the D\O{} detector at the Fermilab Tevatron, we determine $\ensuremath{\sigma}(p\overline{p}\ensuremath{\rightarrow}W+X)\ifmmode\times\else\texttimes\fi{}B(\stackrel{\ensuremath{\rightarrow}}{W}e\ensuremath{\nu})=2310\ifmmode\pm\else\textpm\fi{}10(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}50(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}100(\mathrm{lum})\mathrm{pb}$ and $\ensuremath{\sigma}(p\overline{p}\ensuremath{\rightarrow}Z+X)\ifmmode\times\else\texttimes\fi{}B(\stackrel{\ensuremath{\rightarrow}}{Z}ee)=221\ifmmode\pm\else\textpm\fi{}3(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}4(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}10(\mathrm{lum})\mathrm{pb}.$ From these, we derive $\ensuremath{\sigma}(p\overline{p}\ensuremath{\rightarrow}W+X)\ifmmode\times\else\texttimes\fi{}B(\stackrel{\ensuremath{\rightarrow}}{W}e\ensuremath{\nu})/\ensuremath{\sigma}(p\overline{p}\ensuremath{\rightarrow}Z+X)\ifmmode\times\else\texttimes\fi{}B(\stackrel{\ensuremath{\rightarrow}}{Z}ee)=10.43\ifmmode\pm\else\textpm\fi{}0.15(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.20(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.10(\mathrm{NLO}),$ $B(\stackrel{\ensuremath{\rightarrow}}{W}e\ensuremath{\nu})=0.1044\ifmmode\pm\else\textpm\fi{}0.0015(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.0020(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.0017(\mathrm{theory})\ifmmode\pm\else\textpm\fi{}0.0010(\mathrm{NLO}),$ and ${\ensuremath{\Gamma}}_{W}=2.169\ifmmode\pm\else\textpm\fi{}0.031(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.042(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.041(\mathrm{theory})\ifmmode\pm\else\textpm\fi{}0.022(\mathrm{NLO})\mathrm{GeV}.$ We use the latter to set a 95% confidence level upper limit on the partial decay width of the W boson into nonstandard model final states, ${\ensuremath{\Gamma}}_{W}^{\mathrm{inv}},$ of 0.213 GeV. Combining these results with those from the 1992--1993 data gives $\ensuremath{\sigma}(p\overline{p}\ensuremath{\rightarrow}W+X)\ifmmode\times\else\texttimes\fi{}B(\stackrel{\ensuremath{\rightarrow}}{W}e\ensuremath{\nu})/\ensuremath{\sigma}(p\overline{p}\ensuremath{\rightarrow}Z+X)\ifmmode\times\else\texttimes\fi{}B(\stackrel{\ensuremath{\rightarrow}}{Z}ee)=10.51\ifmmode\pm\else\textpm\fi{}0.25,$ ${\ensuremath{\Gamma}}_{W}=2.152\ifmmode\pm\else\textpm\fi{}0.066\mathrm{GeV},$ and a 95% C.L. upper limit on ${\ensuremath{\Gamma}}_{W}^{\mathrm{inv}}$ of 0.191 GeV. Using a sample with a luminosity of 505 ${\mathrm{nb}}^{\mathrm{\ensuremath{-}}1}$ taken at $\sqrt{s}=630\mathrm{GeV},$ we measure $\ensuremath{\sigma}(p\overline{p}\ensuremath{\rightarrow}W+X)\ifmmode\times\else\texttimes\fi{}B(\stackrel{\ensuremath{\rightarrow}}{W}e\ensuremath{\nu})=658\ifmmode\pm\else\textpm\fi{}67\mathrm{pb}.$

Перевод пока недоступен

Идентификаторы

DOI: 10.1103/physrevd.61.072001

Цитирования и источники

Цитирований: 3Использованных источников: 0

Показатели — AkademScholar