Direct measurement of αQED(m
                            
                                
                                    Z
                                
                                2
                            ) at the FCC-ee

Janot, P.

doi:10.1007/jhep02(2016)053

Cited by 24 publications

(7 citation statements)

References 16 publications

(21 reference statements)

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“…According to ref. [103] both statistical and experimental systematic error can be reduced to this fantastic low level, factor ∼ 200 better than what we have seen in LEP experimental results.…”

Section: Measurement Of αcontrasting

confidence: 45%

“…The idea of using precision measurement of the charge asymmetry A F B near Z resonance in order to extract the QED coupling constant at the the electroweak scale α QED (M Z ) was proposed quite recently in ref. [103]. It is an alternative to the current method calculating α QED (M Z ) using as an input very precisely known α QED (0) and the low energy hadronic cross section as an input to dispersion relations.…”

Section: Measurement Of αmentioning

confidence: 99%

“…Concerning QED uncertainties, it was argued in ref. [103] that because both ISR and IFI corrections do not change sign across the Z peak, they will cancel in the difference A F B (s + ) − A F B (s − ). However, in the analysis of ref.…”

Section: Measurement Of αmentioning

confidence: 99%

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QED challenges at FCC-ee precision measurements

Jadach

Skrzypek

2019

Eur. Phys. J. C

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The expected experimental precision of the rates and asymmetries in the Future Circular Collider with electron positron beams (FCC-ee) in the centre of the mass energy range 88-365GeV considered for construction in CERN, will be better by a factor 5-200. This will be thanks to very high luminosity, factor up to 10 5 higher than in the past LEP experiments. Consequently, it poses the extraordinary challenge of improving the precision of the Standard Model predictions by a comparable factor. In particular the perturbative calculations of the trivial QED effects, which have to be removed from the experimental data, are considered to be a major challenge for almost all quantities to be measured at FCC-ee. The task of this paper is to summarize on the "state of the art" in this class of the calculations left over from the LEP era and to examine what is to be done to match the precision of the FCC-ee experiments -what kind of technical advancements are necessary. The above analysis will be done for most important observables of the FCC-ee like the total cross sections near Z and W W threshold, charge asymmetries, the invisible width of Z boson, the spin asymmetry from τ lepton decay and the luminosity measurement.

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Section: Measurement Of αcontrasting

confidence: 45%

Section: Measurement Of αmentioning

confidence: 99%

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QED challenges at FCC-ee precision measurements

Jadach

Skrzypek

2019

Eur. Phys. J. C

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“…It was demonstrated [9] that A FB (µµ) around the Z pole could also be used to directly measure the electromagnetic coupling constant, α QED (m 2 Z ), with an adequate accuracy to match the precision on the other input parameters of the Standard Model and exploiting the full potential of the FCC to constrain or fit the parameters of Beyond-the-Standard Model theories.…”

Section: Physics At the Z Polementioning

confidence: 99%

Electroweak Physics at Future $e^{+} e^{-}$ Colliders

Locci¹

2018

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2017)

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With the discovery of the Higgs boson at the LHC in 2012, all fundamental parameters of the Standard Model (SM) have been experimentally measured. Then the global fits of the electroweak sector provide a powerful test of the internal consistency of the SM. Any observable sensitive to electroweak corrections can be unambiguously predicted and any deviation of the measurements with respect to the predictions would reveal the existence of new, weakly interacting particles. Thus precision electroweak measurements are a key tool for constraining theories describing physics beyond the SM. Although hadron colliders (Tevatron, LHC) have matched or occasionally exceeded the precision of LEP measurements, e + ecolliders are unrivalled for electroweak precision measurements. The expected performance of the future e + ecolliders is discussed in the perspective of indirect discovery of new physics. These machines are nevertheless well-suited for direct discoveries as well.

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“…The experimental issues involved in resonant depolarization for energy calibration at FCC-ee were recently studied systematically. 18 Other continuing studies at FCC-ee include the measurement of top quark couplings 19 and of the value of α at the Z mass scale, 20 avoiding the need to directly understand hadronic contributions to the running. Such studies, beyond the preliminary estimates, are important to assess whether bottlenecks can be overcome to achieve higher precision results like the inner ellipses in Figure 4.…”

Section: Experimental Choicesmentioning

confidence: 99%

Physics at a Higgs Factory

Reece

2017

The Future of High Energy Physics — Some Aspects

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I give an overview of the physics potential at possible future e + e − colliders, including the ILC, FCC-ee, and CEPC. The goal is to explain some of the measurements that can be done in the context of electroweak precision tests and Higgs couplings, to compare some of the options under consideration, and to put the measurements in context by summarizing their implications for some new physics scenarios.

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Direct measurement of αQED(m Z 2 ) at the FCC-ee

Cited by 24 publications

References 16 publications

QED challenges at FCC-ee precision measurements

QED challenges at FCC-ee precision measurements

Electroweak Physics at Future $e^{+} e^{-}$ Colliders

Physics at a Higgs Factory

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