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- Schael, S, et al.
(author)
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Precision electroweak measurements on the Z resonance
- 2006
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In: Physics Reports. - : Elsevier BV. - 0370-1573 .- 1873-6270. ; 427:5-6, s. 257-454
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Research review (peer-reviewed)abstract
- We report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron-positron colliders SLC and LEP. The data consist of 17 million Z decays accumulated by the ALEPH, DELPHI, L3 and OPAL experiments at LEP, and 600 thousand Z decays by the SLID experiment using a polarised beam at SLC. The measurements include cross-sections, forward-backward asymmetries and polarised asymmetries. The mass and width of the Z boson, m(Z) and Gamma(Z), and its couplings to fermions, for example the p parameter and the effective electroweak mixing angle for leptons, are precisely measured: m(Z) = 91.1875 +/- 0.0021 GeV, Gamma(Z) = 2.4952 +/- 0.0023 GeV, rho(l) = 1.0050 +/- 0.0010, sin(2)theta(eff)(lept) = 0.23153 +/- 0.00016. The number of light neutrino species is determined to be 2.9840 +/- 0.0082, in agreement with the three observed generations of fundamental fermions. The results are compared to the predictions of the Standard Model (SM). At the Z-pole, electroweak radiative corrections beyond the running of the QED and QCD coupling constants are observed with a significance of five standard deviations, and in agreement with the Standard Model. Of the many Z-pole measurements, the forward-backward asymmetry in b-quark production shows the largest difference with respect to its SM expectation, at the level of 2.8 standard deviations. Through radiative corrections evaluated in the framework of the Standard Model, the Z-pole data are also used to predict the mass of the top quark, m(t) = 173(+10)(+13) GeV, and the mass of the W boson, m(W) = 80.363 +/- 0.032 GeV. These indirect constraints are compared to the direct measurements, providing a stringent test of the SM. Using in addition the direct measurements of m(t) and m(W), the mass of the as yet unobserved SM Higgs boson is predicted with a relative uncertainty of about 50% and found to be less than 285 GeV at 95% confidence level. (c) 2006 Elsevier B.V. All rights reserved.
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- Aad, G, et al.
(author)
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Search for Higgs Boson Pair Production in the γγbb[over ¯] Final State Using pp Collision Data at sqrt[s]=8 TeV from the ATLAS Detector.
- 2015
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In: Physical Review Letters. - 1079-7114. ; 114:8
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Journal article (peer-reviewed)abstract
- Searches are performed for resonant and nonresonant Higgs boson pair production in the γγbb[over ¯] final state using 20 fb^{-1} of proton-proton collisions at a center-of-mass energy of 8 TeV recorded with the ATLAS detector at the CERN Large Hadron Collider. A 95% confidence level upper limit on the cross section times branching ratio of nonresonant production is set at 2.2 pb, while the expected limit is 1.0 pb. The difference derives from a modest excess of events, corresponding to 2.4 standard deviations from the background-only hypothesis. The limit observed in the search for a narrow X→hh resonance ranges between 0.7 and 3.5 pb as a function of the resonance mass.
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- 2014
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Journal article (peer-reviewed)
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- Aad, G., et al.
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- 2014
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In: Physical Review C (Nuclear Physics). - 0556-2813 .- 1089-490X. ; 90:4
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- 2015
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- 2014
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In: The European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6052. ; 74:6
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- 2014
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- 2014
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In: The European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6052. ; 74:10
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- 2014
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- 2014
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In: Physical Review C (Nuclear Physics). - 0556-2813 .- 1089-490X. ; 90:2
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- 2014
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- 2014
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In: The European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6052. ; 74:12
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- 2014
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- 2014
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In: The European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6052. ; 74:11
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- 2015
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In: The European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6052. ; 75:1
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- 2015
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In: Physical Review D (Particles, Fields, Gravitation and Cosmology). - 1550-2368 .- 1550-7998. ; 91:5
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- 2014
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In: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 112:4
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- 2014
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In: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 112:9
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- 2013
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In: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :7
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- 2015
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In: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :1, s. 1-67
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- 2014
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In: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :5
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