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Abe, K.; Abt, I.; Acton, P. D.; Adolphsen, C.; Agnew, Gary; Alber, C.; Alzofon, D.; Antilogus, P.; Arroyo, C.; Ash, W. W.; Ashford, V.; Astbury, A.; Aston, D.; Au, Y.; Axen, D.; Bacchetta, N.; Baird, K.; Baker, William K.; Baltay, C.; Band, H. R.; Baranko, G.; Bardon, O.; Barrera, Francisco Borja; Battiston, R.; Bazarko, A.O.; Bean, A.; Beer, G.; Belcinski, R.; Bell, R.A.I.; Ben‐David, R.; Benvenuti, A. C.; Berger, Robert; Berridge, S.; Bethke, S.; Biasini, M.; Bienz, T.; Bilei, G. M.; Bird, F.; Bisello, D.; Blaylock, G.; Blumberg, R.; Bogart, J. R.; Bolton, T.; Bougerolle, S.; Bower, G. R.; Boyce, R.; Brau, J. E.; Breidenbach, M.; Browder, T. E.; Bugg, W.; Burgess, B.; Burke, D. L.; Burnett, T. H.; Burrows, P.N.; Busza, W.; Byers, B.L.; Calcaterra, A.; Caldwell, D. O.; Calloway, D.; Camanzi, B.; Camilleri, L.; Carpinelli, M.; Carr, J.; Cartwright, S.; Cassell, R.; Castaldi, R.; Castro, A.; Cavalli‐Sforza, M.; Chadwick, G. B.; Chamberlain, O.; Chambers, D. M.; Chen, L.; Clarke, P. E. 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doi:10.1103/physrevlett.70.2515

Cited by 64 publications

(18 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The analyzing powers are defined in terms of the Compton scattering cross section and the response function of each channel R j , j , and the order-α 3 fractional correction to the analyzing power are listed for each channel. The SLC beam polarization is determined from the channels near the endpoint (5)(6)(7). It is clear that proper inclusion of the radiative corrections increases the analyzing powers by 0.1% of themselves.…”

Section: Resultsmentioning

confidence: 99%

“…28 and 29 to calculate the event weights W 3 and W 4 (W 1 and W 2 are always returned as 0). The five quantities E ′ e , cos θ ′ e , φ ′ e , E ′′ e , and φ ′′ e are chosen according to the density function ρ (5) as follows,…”

Section: The Generator Comeeementioning

confidence: 99%

“…This polarimeter is a key component in the measurement of the left-right Z-boson production asymmetry A 0 LR which has been performed over several years by the SLD Collaboration [5]. At the current time, the measured value of A 0 LR is approximately 8% larger than the value of the comparable quantity extracted from measurements of six different Z-pole asymmetries by the four LEP Collaborations [6].…”

Section: Introductionmentioning

confidence: 99%

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Complete order-α3calculation of the cross section for polarized Compton scattering

Swartz

1998

Phys. Rev. D

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The construction of a computer code to calculate the cross sections for the spin-polarized processes e − γ → e − γ, e − γγ, e − e + e − to order-α 3 is described.The code calculates cross sections for circularly-polarized initial-state photons and arbitrarily polarized initial-state electrons. The application of the code to the SLD Compton polarimeter indicates that the order-α 3 corrections produce a fractional shift in the SLC polarization scale of −0.1% which is too small and of the wrong sign to account for the discrepancy in the Z-pole asymmetries measured by the SLD Collaboration and the LEP Collaborations.

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Section: Resultsmentioning

confidence: 99%

Section: The Generator Comeeementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Complete order-α3calculation of the cross section for polarized Compton scattering

Swartz

1998

Phys. Rev. D

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“…The analysis is based on the data from the LEP and SLC experiments published up to the year 1993 [26,89,90]. Discussions of the recent update from LEP [91] and the precision measurement of the left-right asymmetry at SLC [31] are postponed to section 6.…”

Section: Z Boson Parametersmentioning

confidence: 99%

“…This value is 2.5 standard deviations smaller than (4.5b). Excluding the possibility of a shift caused by a systematic effect this measurement may be considered as a statistical fluctuation and then be combined with the other asymmetry data on the Z-pole, that is, the lepton (e, µ, τ ) forward-backward asymmetry [26], the τ polarization asymmetry [26], the left-right asymmetry [31] and the quark (b,c) forward-backward asymmetries [26], as well as with the old left-right asymmetry data from SLD [90]. The result is…”

Section: Update Of Lep Datamentioning

confidence: 99%

A novel approach to confront electroweak data and theory

Hagiwara

Haidt

Kim

et al. 1994

Z. Phys. C - Particles and Fields

178

352

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A novel approach to study electroweak physics at one-loop level in generic SU(2) L × U(1) Y theories is introduced. It separates the 1-loop corrections into two pieces: process specific ones from vertex and box contributions, and universal ones from contributions to the gauge boson propagators. The latter are parametrized in terms of four effective form factorsē 2 (q 2 ),s 2 (q 2 ),ḡ 2 Z (q 2 ) andḡ 2 W (q 2 ) corresponding to the γγ, γZ, ZZ and W W propagators. Under the assumption that only the Standard Model contributes to the process specific corrections, the magnitudes of the four form factors are determined at q 2 = 0 and at q 2 = m 2 Z by fitting to all available precision experiments. These values are then compared systematically with predictions of SU(2) L × U(1) Y theories. In all fits α s (m Z ) andᾱ(m 2 Z ) are treated as external parameters in order to keep the interpretation as flexible as possible. The treatment of the electroweak data is presented in detail together with the relevant theoretical formulae used to interpret the data. No deviation from the Standard Model has been identified. Ranges of the top quark and Higgs boson masses are derived as functions of α s (m Z ) andᾱ(m 2 Z ). Also discussed are consequences of the recent precision measurement of the left-right asymmetry at SLC as well as the impact of a top quark mass and an improved W mass measurement.To be published in Zeitschrift für Physik C into account by introducing appropriate external parameters. Up to this stage, our analysis is quite general, as the formulae are valid for any electroweak model respecting the flavor and chirality conservation laws of the SM, that is, for all new physics contributions which can interfere with the leading SM amplitudes.Although one may attempt to constrain these model-independent transition form factors directly by experiment, we find it impractical, since the number of independent 4 transition form factors exceeds by far the effective number of degrees of freedom provided by precision measurements. Hence, we perform the quantitative comparison of data with theory in a more restricted class of models which are minimal extensions from the SM, i.e. those models which respect the SU(2) L × U(1) Y gauge symmetry broken spontaneously down to U(1) EM .3: The transition form factors are expanded perturbatively in SU(2) L × U(1) Y gauge couplings, and radiative effects are classified either as the universal gauge boson propagator corrections or as the process specific vertex and box corrections. The universal propagator correction factors are then parameterized by four charge form factors,ē 2 (q 2 ),s 2 (q 2 ),ḡ 2 Z (q 2 ) andḡ 2 W (q 2 ), corresponding to the γγ, γZ, ZZ and W W propagator degrees of freedom.The restriction to the electroweak gauge group SU(2) L × U(1) Y implies at the tree level that all fermions, quarks and leptons, couple to the electroweak gauge bosons universally with the same coupling constant as long as they have common SU(2) L × U(1) Y quantum numbers. This universality of the g...

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6 Experimental Precision Tests for the Electroweak Standard Model

Grünewald¹

2008

Theory and Experiments

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This paper contains a review of recent precision measurements of electroweak observables and resulting tests of the electroweak Standard Model. Invited Chapter for a Handbook of Particle Physics IntroductionThe last twenty years have seen enormous progress in experimental precision measurements in particle physics and tests of the electroweak Standard Model. New generations of experiments using advanced detectors at high-energy particle colliders perform measurements with a precision unprecedented in high-energy particle physics. This review summarises the major exciting experimental results measured at the highest energies and pertaining to the electroweak interaction.Comparisons with the theory, the Standard Model of particle physics (SM) [1], are used to test the theory and to constrain its free parameters. The data sets analysed for the precision measurements presented here have been accumulated at the world's highest-energy particle colliders over the last two decades. They verify the SM as a renormalisable field theory correctly describing nature. Electron-positron collisions at 91 GeV centre-of-mass energy were studied by the SLD detector [8], operating at Stanford's Linear Collider (SLC) [12] (1989-1998), and by the experiments ALEPH [13], DELPHI [15], L3 [17] and OPAL [21], taking data at the Large Electron Positron collider (LEP) [25] (1989-1995) at the European Laboratory for Particle Physics, CERN, Geneva, Switzerland. This centre-of-mass energy corresponds to the mass of the Z boson, the heavy neutral exchange particle of the electroweak interaction, which is thus produced in resonance, e + e − → Z. While SLC provided interactions at a fixed centre-of-mass energy corresponding to the maximum of the Z resonance cross section, the LEP-I collider provided collisions at several centre-of-mass energy points, thereby scanning the Z resonance lineshape in the range from 88 GeV to 94 GeV. By increasing the LEP center-of-mass energy up to 209 GeV (LEP-II, 1996, the precision measurements of Z-boson properties at LEP-I were complemented by measurements of the properties of the W-boson, the charged carrier of the electroweak interaction, in the reaction e + e − → W + W − at LEP-II. Proton-antiproton collisions are provided by the Tevatron collider operating at the Fermi Na-2 tional Accelerator Laboratory close to Chicago in the USA, at centre-of-mass energies of 1.8 TeV (Run-I, 1992(Run-I, -1996 and 2.0 TeV (Run-II, since 2001), and are studied by the experiments CDF [29] and DØ [30]. Results from the Tevatron experiments important for the electroweak interaction include measurements of the mass of the W boson, as well as the discovery of the sixth and heaviest quark known today, the top quark, in 1995 and the measurements of its properties, in particular its mass. In addition, key measurements were performed in dedicated experiments at lower interaction energies, notably the measurement of the anomalous magnetic moment of the muon [32], as well as the measurements of parity violation effects in a...

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First measurement of the left-right cross section asymmetry inZboson production bye+e−

Cited by 64 publications

References 13 publications

Complete order-α3calculation of the cross section for polarized Compton scattering

Complete order-α3calculation of the cross section for polarized Compton scattering

A novel approach to confront electroweak data and theory

6 Experimental Precision Tests for the Electroweak Standard Model

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