92 research outputs found

    A determination of electroweak parameters from Z0→Ό+ÎŒ- (Îł)

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    Measurement of Z0 decays to hadrons, and a precise determination of the number of neutrino species

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    We have made a precise measurement of the cross section for e+e--->Z0-->hadrons with the L3 detector at LEP, covering the range from 88.28 to 95.04 GeV. From a fit to the Z0 mass, total width, and the hadronic cross section to be MZ0=91.160 +/- 0.024 (experiment) +/-0.030(LEP) GeV, [Gamma]Z0=2.539+/-0.054 GeV, and [sigma]h(MZ0)=29.5+/-0.7 nb. We also used the fit to the Z0 peak cross section and the width todetermine [Gamma]invisible=0.548+/-0.029 GeV, which corresponds to 3.29+/-0.17 species of light neutrinos. The possibility of four or more neutrino flavors is thus ruled out at the 4[sigma] confidence level.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/28683/3/0000500.pd

    A measurement of the Z0 leptonic partial widths and the vector and axial vector coupling constants

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    We have measured the partial widths of the Z0 into lepton pairs, and the forward-backward charge asymmetry for the process e+e--->[mu]+[mu]- using the L3 detector at LEP. We obtain an average [Gamma]ll of 83.0+/-2.1+/-1.1 MeV.From this result and the asymmetry measurement, we extract the values of the vector and axial vector couplings of the Z0 to leptons: grmv=-0.066-0.027+0.046 and grmA= -0.495-0.007+0.007.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/28666/3/0000483.pd

    УпраĐČĐ»Đ”ĐœĐžĐ” ŃĐžŃŃ‚Đ”ĐŒĐŸĐč ŃĐ»Đ”ĐșŃ‚Ń€ĐŸŃ…ĐžĐŒĐžŃ‡Đ”ŃĐșĐŸĐč защОты ĐŒĐ°ĐłĐžŃŃ‚Ń€Đ°Đ»ŃŒĐœĐŸĐłĐŸ ĐłĐ°Đ·ĐŸĐżŃ€ĐŸĐČĐŸĐŽĐ° ĐČ ŃƒŃĐ»ĐŸĐČоях ĐČĐ”Ń‡ĐœĐŸĐč ĐŒĐ”Ń€Đ·Đ»ĐŸŃ‚Ń‹

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    ОбъДĐșŃ‚ĐŸĐŒ ĐžŃŃĐ»Đ”ĐŽĐŸĐČĐ°ĐœĐžŃ ĐżĐŸĐŽŃĐžŃŃ‚Đ”ĐŒĐ° ĐșĐŸŃ€Ń€ĐŸĐ·ĐžĐŸĐœĐœĐŸĐłĐŸ ĐŒĐŸĐœĐžŃ‚ĐŸŃ€ĐžĐœĐłĐ° ŃĐ»Đ”ĐșŃ‚Ń€ĐŸŃ…ĐžĐŒĐžŃ‡Đ”ŃĐșĐŸĐč Đ·Đ°ŃˆĐžŃ‚Ń‹ ĐŒĐ°ĐłĐžŃŃ‚Ń€Đ°Đ»ŃŒĐœĐŸĐłĐŸ ĐłĐ°Đ·ĐŸĐżŃ€ĐŸĐČĐŸĐŽĐ°. ĐŠĐ”Đ»ŃŒ Ń€Đ°Đ±ĐŸŃ‚Ń‹ – ĐżŃ€ĐŸĐ°ĐœĐ°Đ»ĐžĐ·ĐžŃ€ĐŸĐČать упраĐČĐ»Đ”ĐœĐžĐ” ŃĐžŃŃ‚Đ”ĐŒĐŸĐč ŃĐ»Đ”ĐșŃ‚Ń€ĐŸŃ…ĐžĐŒĐžŃ‡Đ”ŃĐșĐŸĐč Đ·Đ°ŃˆĐžŃ‚Ń‹ ĐŒĐ°ĐłĐžŃŃ‚Ń€Đ°Đ»ŃŒĐœĐŸĐłĐŸ ĐłĐ°Đ·ĐŸĐżŃ€ĐŸĐČĐŸĐŽĐ° ĐČ ŃƒŃĐ»ĐŸĐČоях ĐČĐ”Ń‡ĐœĐŸĐč ĐŒĐ”Ń€Đ·Đ»ĐŸŃ‚Ń‹. В Ń€Đ”Đ·ŃƒĐ»ŃŒŃ‚Đ°Ń‚Đ” Đ°ĐœĐ°Đ»ĐžĐ·Đ° ŃƒŃŃ‚Đ°ĐœĐŸĐČĐ»Đ”ĐœĐŸ, Ń‡Ń‚ĐŸ ПКМ-йХй-ĐšĐŸĐœŃ‚ĐšĐŸŃ€Ń€ ŃƒĐŽĐŸĐČлДтĐČĐŸŃ€ŃĐ”Ń‚ Ń‚Ń€Đ”Đ±ĐŸĐČĐ°ĐœĐžŃĐŒ ŃĐžŃŃ‚Đ”ĐŒŃ‹ упраĐČĐ»Đ”ĐœĐžŃ Ń‚Đ”Ń…ĐœĐžŃ‡Đ”ŃĐșĐžĐŒ ŃĐŸŃŃ‚ĐŸŃĐœĐžĐ”ĐŒ Đž Ń†Đ”Đ»ĐŸŃŃ‚ĐœĐŸŃŃ‚ŃŒŃŽ ĐżĐ»ĐŸŃ‰Đ°ĐŽĐœŃ‹Ń… ĐŸĐ±ŃŠĐ”ĐșŃ‚ĐŸĐČ ĐŸŃ€ĐłĐ°ĐœĐžĐ·Đ°Ń†ĐžĐž.The object of study is the subsystem of corrosion monitoring of electrochemical protection of the main gas pipeline. The purpose of the work is to analyze the management of the system of electrochemical protection of the main gas pipeline in permafrost conditions. As a result of the analysis, it was established that PKM-TST-KontKorr satisfies the requirements of the system for managing the technical condition and integrity of the organization’s area facilities

    Measurement of electroweak parameters from hadronic and leptonic decays of the Z 0

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    We have studied the reactions e + e − →hadrons, e + e − , ÎŒ + ÎŒ − and τ + τ − , in the energy range 88.2 GeV. A total luminosity of 5.5 pb −1 , corresponding to approximately 115000 hadronic and 10000 leptonic Z 0 decays, has been recorded with the L3 detector. From a simultaneous fit to all of our measured cross section data, we obtain assuming lepton universality:Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/47890/1/10052_2005_Article_BF01475788.pd

    Search for excited taus from Z0 decays

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    Test of QED in e+e−→γγ at LEP

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    Test of QED in e+e- -->gammagamma at LEP

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    Contains fulltext : 27584.PDF (publisher's version ) (Open Access
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