90 research outputs found

    Design and construction of the MicroBooNE detector

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    This paper describes the design and construction of the MicroBooNE liquid argon time projection chamber and associated systems. MicroBooNE is the first phase of the Short Baseline Neutrino program, located at Fermilab, and will utilize the capabilities of liquid argon detectors to examine a rich assortment of physics topics. In this document details of design specifications, assembly procedures, and acceptance tests are reported

    Measurement of the B+B^+ Total Cross Section and B+B^+ Differential Cross Section dσ/dpTd\sigma/dp_T in ppˉp \bar p Collisions at s=1.8\sqrt{s}=1.8 TeV

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    We present measurements of the B+ meson total cross section and differential cross section dσ/dpTd\sigma/ dp_T. The measurements use a 98±498\pm 4 pb^{-1} sample of ppˉp \bar p collisions at s=1.8\sqrt{s}=1.8 TeV collected by the CDF detector. Charged BB meson candidates are reconstructed through the decay B±J/ψK±B^{\pm} \to J/\psi K^{\pm} with J/ψμ+μJ/\psi\to \mu^+ \mu^-. The total cross section, measured in the central rapidity region y6.0|y|6.0 GeV/cc, is 3.6±0.6(statsyst)μ3.6 \pm 0.6 ({\rm stat} \oplus {\rm syst)} \mub. The measured differential cross section is substantially larger than typical QCD predictions calculated to next-to-leading order

    Measurement of the longitudinal diffusion of ionization electrons in the MicroBooNE detector

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    Abstract: Accurate knowledge of electron transport properties is vital to understanding the information provided by liquid argon time projection chambers (LArTPCs). Ionization electron drift-lifetime, local electric field distortions caused by positive ion accumulation, and electron diffusion can all significantly impact the measured signal waveforms. This paper presents a measurement of the effective longitudinal electron diffusion coefficient, DL, in MicroBooNE at the nominal electric field strength of 273.9 V/cm. Historically, this measurement has been made in LArTPC prototype detectors. This represents the first measurement in a large-scale (85 tonne active volume) LArTPC operating in a neutrino beam. This is the largest dataset ever used for this measurement. Using a sample of ∼70,000 through-going cosmic ray muon tracks tagged with MicroBooNE's cosmic ray tagger system, we measure DL = 3.74+0.28 -0.29 cm2/s

    Measurement of the tt¯ cross section and its ratio to the Z production cross section using pp collisions at √s = 13.6 TeV with the ATLAS detector

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    The inclusive top-quark-pair production cross section σtt¯ and its ratio to the Z-boson production cross section have been measured in proton–proton collisions at √s = 13.6 TeV, using 29 fb−1 of data collected in 2022 with the ATLAS experiment at the Large Hadron Collider. Using events with an opposite-charge electron-muon pair and b-tagged jets, and assuming Standard Model decays, the top-quark-pair production cross section is measured to be σtt¯=850±3(stat.)±18(syst.)±20(lumi.) pb. The ratio of the tt¯ and the Z-boson production cross sections is also measured, where the Z-boson contribution is determined for inclusive e+e− and μ+μ− events in a fiducial phase space. The relative uncertainty on the ratio is reduced compared to the tt¯ cross section, thanks to the cancellation of several systematic uncertainties. The result for the ratio, Rtt¯/Z=1.145±0.003(stat.)±0.021(syst.)±0.002(lumi.) is consistent with the Standard Model prediction using the PDF4LHC21 PDF set