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Full-Text Articles in Physics
Combination Of Cdf And D0 Results On The W Boson Mass And Width, V. M. Abazov, Gregory Snow, D0 Collaboration
Combination Of Cdf And D0 Results On The W Boson Mass And Width, V. M. Abazov, Gregory Snow, D0 Collaboration
Gregory Snow Publications
The results based on 1992–95 data (Run 1) from the CDF and D0 experiments on the measurements of the W boson mass and width are presented, along with the combined results. We report a Tevatron collider average Mw = 80.456 ± 0.059 GeV. We also report the Tevatron collider average of the directly measured W boson width Γw = 2.115 ± 0.105 GeV. We describe a new joint analysis of the direct W mass and width measurements. Assuming the validity of the standard model, we combine the directly measured W boson width with the width extracted from the …
Measurement Of The Ratio Of Inclusive Cross Sections Σ(Pp̅ → Z + B Jet)/Σ(Pp̅ → Z + Jet) At √S = 1.96 Tev, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Measurement Of The Ratio Of Inclusive Cross Sections Σ(Pp̅ → Z + B Jet)/Σ(Pp̅ → Z + Jet) At √S = 1.96 Tev, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Gregory Snow Publications
Using the data collected with the D0 detector at √s = 1.96 TeV, for integrated luminosities of about 180 pb-1, we have measured the ratio of inclusive cross sections for pp̅ → Z + b jet to pp̅ → Z + jet production. The inclusive Z + b-jet reaction is an important background to searches for the Higgs boson in associated ZH production at the Fermilab Tevatron collider. Our measurement is the first of its kind, and relies on the Z → ℯ+ℯ- and Z → μ+μ- modes. The combined …
Search For First-Generation Scalar Leptoquarks In (Pp̅ Collisions At√S = 1.96 Tev, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Search For First-Generation Scalar Leptoquarks In (Pp̅ Collisions At√S = 1.96 Tev, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Gregory Snow Publications
We report on a search for pair production of first-generation scalar leptoquarks (LQ) in pp̅ collisions at √s = 1.96 TeV using an integrated luminosity of 252 pb-1 collected at the Fermilab Tevatron collider by the D0 detector. We observe no evidence for LQ production in the topologies arising from LQL̅Q̅ → ℯqℯq and LQL̅Q̅ → ℯqνq, and derive 95% C.L. lower limits on the LQ mass as a function of β, where β is the branching fraction for LQ → ℯq. The limits are 241 and 218 GeV/c2 for β = 1 and …
Measurement Of The Ww Production Cross Section In Pp̅ Collisions At √S = 1.96 Tev, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Measurement Of The Ww Production Cross Section In Pp̅ Collisions At √S = 1.96 Tev, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Gregory Snow Publications
We present a measurement of the W boson pair-production cross section in pp̅ collisions at a center-of- mass energy of √s = 1.96 TeV. The data, collected with the Run II D0 detector at Fermilab, correspond to an integrated luminosity of 224–252 pb-1 depending on the final state (ℯℯ, ℯμ, or μμ). We observe 25 candidates with a background expectation of 8.1 ± 0.6(stat) ± 0.6(syst) ± 0.5(lum) events. The probability for an upward fluctuation of the background to produce the observed signal is 2.3 x 10-7, equivalent to 5.2 standard deviations. The measurement yields a …
Search For Anomalous Heavy-Flavor Quark Production In Association With W Bosons, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Search For Anomalous Heavy-Flavor Quark Production In Association With W Bosons, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Gregory Snow Publications
We search for anomalous production of heavy-flavor quark jets in association with W bosons at the Fermilab Tevatron pp̅ Collider in final states in which the heavy-flavor quark content is enhanced by requiring at least one tagged jet in an event. Jets are tagged using one algorithm based on semileptonic decays of b/c hadrons, and another on their lifetimes. We compare ℯ+ jets (164 pb-1) and μ+ jets (145 pb-1) channels collected with the D0 detector at √s = 1.96 TeV to expectations from the standard model and set upper limits …
Measurement Of Σ(Pp̅→Z)•Br(Z→ Ττ) At √S = 1.96tev, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Measurement Of Σ(Pp̅→Z)•Br(Z→ Ττ) At √S = 1.96tev, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Gregory Snow Publications
We present a measurement of the cross section for Z production times the branching fraction to _ leptons, σ•Br(Z → τ+τ-), in pp̅ collisions at √s = 1.96 TeV in the channel in which one τ decays into μνμντ, and the other into hadrons +ντ or ℯνℯντ. The data sample corresponds to an integrated luminosity of 226 pb-1 collected with the D0 detector at the Fermilab Tevatron collider. The final sample contains 2008 candidate events with an estimated background of 55%. From this we …
Measurement Of The ΛB0 Lifetime In The Decay ΛB0 → J/Ψλ0 With The D0 Detector, V. M. Abazov, Gregory Snow, D0 Collaboration
Measurement Of The ΛB0 Lifetime In The Decay ΛB0 → J/Ψλ0 With The D0 Detector, V. M. Abazov, Gregory Snow, D0 Collaboration
Gregory Snow Publications
We present measurements of the Λb0 lifetime in the exclusive decay channel Λb0 → J/ψΛ0, with J/ψ → μ+μ- and Λ0 → pπ-, the B0 lifetime in the decay Λ0 → J/ψKs0 with J/ψ → μ+μ- and Ks0 → π+π-, and the ratio of these lifetimes. The analysis is based on approximately 250 pb-1 of data recorded with the D0 detector in pp̅ collisions at √s = …
Search For WBb̅ And Wh Production In Pp̅ Collisions At √S = 1.96 Tev, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Search For WBb̅ And Wh Production In Pp̅ Collisions At √S = 1.96 Tev, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Gregory Snow Publications
We present a search for Wbb̅ production in pp̅ collisions at √s = 1.96 TeV in events containing one electron, an imbalance in transverse momentum, and two b-tagged jets. Using 174 pb-1 of integrated luminosity accumulated by the D0 experiment at the Fermilab Tevatron collider, and the standard-model description of such events, we set a 95% C.L. upper limit on Wbb̅ production of 6.6 pb for b quarks with transverse momenta pTb > 20 GeV and bb̅ separation in pseudorapidity-azimuth space ΔRbb > 0.75. Restricting the search to optimized bb̅ mass intervals provides …
Search For The Flavor-Changing Neutral Current Decay BS0 → Μ+Μ- In Pp̅ Collisions At √S = 1.96 Tev With The D0 Detector, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Search For The Flavor-Changing Neutral Current Decay BS0 → Μ+Μ- In Pp̅ Collisions At √S = 1.96 Tev With The D0 Detector, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Gregory Snow Publications
We present the results of a search for the flavor-changing neutral current decay Bs0 → μ+μ- using a data set with integrated luminosity of 240 pb-1 of pp̅ collisions at √s = 1.96 TeV collected with the D0 detector in run II of the Fermilab Tevatron collider.We find the upper limit on the branching fraction to be Ɓ(Bs0 → μ+μ-) ≤ 5.0 x 10-7 at the 95% C.L. assuming no contributions from the decay Bd0 → μ+μ- in the signal …
Measurement Of The BS0 Lifetime In The Exclusive Decay Channel BS0 → J/Ψφ, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Measurement Of The BS0 Lifetime In The Exclusive Decay Channel BS0 → J/Ψφ, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Gregory Snow Publications
Using the exclusive decay Bs0 → J/ψ(μ+μ-)Φ(K+K-), we report the most precise single measurement of the Bs0 lifetime. The data sample corresponds to an integrated luminosity of approximately 220 pb-1 collected with the D0 detector at the Fermilab Tevatron Collider in 2002–2004. We reconstruct 337 signal candidates, from which we extract the Bs0 lifetime, τ(Bs0) = 1.444-0.090+0.098(stat) ± 0.020(sys) ps. We also report a measurement for the lifetime of the B0 meson using the exclusive …
Search For Supersymmetry With Gauge-Mediated Breaking In Diphoton Events At D0, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Search For Supersymmetry With Gauge-Mediated Breaking In Diphoton Events At D0, V. M. Abazov, Gregory R. Snow, D0 Collaboration
Gregory Snow Publications
We report the results of a search for supersymmetry (SUSY) with gauge-mediated breaking in the missing transverse energy distribution of inclusive diphoton events using 263 pb-1 of data collected by the D0 experiment at the Fermilab Tevatron Collider in 2002–2004. No excess is observed above the background expected from standard model processes, and lower limits on the masses of the lightest neutralino and chargino of about 108 and 195 GeV, respectively, are set at the 95% confidence level. These are the most stringent limits to date for models with gauge-mediated SUSY breaking with a short-lived neutralino as the next-to-lightest …