Global fits of the SM parameters

Erler, Jens

doi:10.22323/1.350.0105

Cited by 3 publications

(3 citation statements)

References 61 publications

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“…In this respect, DIS provides a unique opportunity for precision measurements in the space-like regime (μ 2 < 0), as discussed in the previous section, see figure 62 ) from LHeC inclusive DIS data using recent averaged values. The results from the LEP collider and the SLC [444], the Tevatron [446], the LHC [447][448][449][450] and the world average value [450] are all obtained from a combination of various separate measurements (not shown individually) (see also reference [451] for additional discussions). For the LHeC, the experimental and PDF uncertainties are displayed.…”

Section: Weak Neutral-current Couplingsmentioning

confidence: 99%

The Large Hadron–Electron Collider at the HL-LHC

Agostini

Aksakal

Alekhin

et al. 2021

J. Phys. G: Nucl. Part. Phys.

144

129

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The Large Hadron–Electron Collider (LHeC) is designed to move the field of deep inelastic scattering (DIS) to the energy and intensity frontier of particle physics. Exploiting energy-recovery technology, it collides a novel, intense electron beam with a proton or ion beam from the High-Luminosity Large Hadron Collider (HL-LHC). The accelerator and interaction region are designed for concurrent electron–proton and proton–proton operations. This report represents an update to the LHeC’s conceptual design report (CDR), published in 2012. It comprises new results on the parton structure of the proton and heavier nuclei, QCD dynamics, and electroweak and top-quark physics. It is shown how the LHeC will open a new chapter of nuclear particle physics by extending the accessible kinematic range of lepton–nucleus scattering by several orders of magnitude. Due to its enhanced luminosity and large energy and the cleanliness of the final hadronic states, the LHeC has a strong Higgs physics programme and its own discovery potential for new physics. Building on the 2012 CDR, this report contains a detailed updated design for the energy-recovery electron linac (ERL), including a new lattice, magnet and superconducting radio-frequency technology, and further components. Challenges of energy recovery are described, and the lower-energy, high-current, three-turn ERL facility, PERLE at Orsay, is presented, which uses the LHeC characteristics serving as a development facility for the design and operation of the LHeC. An updated detector design is presented corresponding to the acceptance, resolution, and calibration goals that arise from the Higgs and parton-density-function physics programmes. This paper also presents novel results for the Future Circular Collider in electron–hadron (FCC-eh) mode, which utilises the same ERL technology to further extend the reach of DIS to even higher centre-of-mass energies.

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Section: Weak Neutral-current Couplingsmentioning

confidence: 99%

The Large Hadron–Electron Collider at the HL-LHC

Agostini

Aksakal

Alekhin

et al. 2021

J. Phys. G: Nucl. Part. Phys.

144

129

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“…We will now consider sin 2 θ W as a free parameter which is allowed to vary in a sin 2 θ W +PDF fit. Note that we consider in The results from LEP+SLD [62], Tevatron [72], LHC [73][74][75][76] and the SM value refer to the leptonic weak mixing angle, sin 2 θ eff W, , and include the information about the W -and Z -boson masses [76]. They are all obtained from a combination of various separate measurements (not shown individually) (see also Ref.…”

Section: Weak Boson Massesmentioning

confidence: 99%

Electroweak physics in inclusive deep inelastic scattering at the LHeC

2020

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At the proposed electron-proton collider LHeC electroweak interactions can be uniquely studied in a largely unexplored kinematic region of spacelike momentum transfer. We simulate inclusive neutral- and charged-current deep-inelastic lepton proton scattering cross section data at center-of-mass energies of 1.2 and 1.3 TeV, and estimate the uncertainties of Standard Model parameters as well as of parameters describing physics beyond the Standard Model. A precision at sub-percent level is expected for the measurement of the weak neutral-current couplings of the light-quarks to the Z boson, $$g_{A/V}^{u/d}$$ g A / V u / d , improving their present precision by more than an order of magnitude. The weak mixing angle can be determined with a precision of about $$\Delta \sin ^2\theta _\text {W}=\pm \,0.00015$$ Δ sin 2 θ W = ± 0.00015 , and its scale dependence can be studied in the range between about 25 and 700 GeV. An indirect determination of the W-boson mass in the on-shell scheme is possible with an experimental uncertainty down to $$\Delta m_{W}=\pm \,6\,\text {MeV}$$ Δ m W = ± 6 MeV . We discuss how measurements in deep-inelastic scattering compare with those in the timelike domain, and which aspects are unique, for instance electroweak parameters in charged-current interactions. We conclude that the LHeC will determine electroweak physics parameters, in the spacelike region, with unprecedented precision leading to thorough tests of the Standard Model and possibly beyond.

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“…In the on-shell scheme, sin 2 θ W and m W are related to each other and a measurement of one parameter can be interpreted as a determination of the other. The uncertainty The results from LEP+SLD [62], Tevatron [72], LHC [73][74][75][76] and the SM value refer to the leptonic weak mixing angle, sin 2 θ eff W, , and include the information about the W -and Z-boson masses [76]. They are all obtained from a combination of various separate measurements (not shown individually) (see also Ref.…”

Section: W-boson Massmentioning

confidence: 99%

Electroweak Physics in Inclusive Deep Inelastic Scattering at the LHeC

Britzger¹,

Klein²,

Spiesberger³

2020

Preprint

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The proposed electron-proton collider LHeC is a unique facility where electroweak interactions can be studied with a very high precision in a largely unexplored kinematic regime of spacelike momentum transfer. We have simulated inclusive neutraland charged-current deep-inelastic lepton proton scattering cross section data at center-of-mass energies of 1.2 and 1.3 TeV including their systematic uncertainties. Based on simultaneous fits of electroweak physics parameters and parton distribution functions, we estimate the uncertainties of Standard Model parameters as well as a number of parameters describing physics beyond the Standard Model, for instance the oblique parameters S, T , and U . An unprecedented precision at the sub-percent level is expected for the measurement of the weak neutral-current couplings of the light-quarks to the Z boson, g u/d A/V , improving their present precision by more than an order of magnitude. The weak mixing angle can be determined with a precision of about ∆ sin 2 θ W = ±0.00015, and its scale dependence can be studied in the range between about 25 and 700 GeV. An indirect determination of the W -boson mass in the on-shell scheme is possible with an experimental uncertainty down to ∆m W = ±6 MeV. We discuss how the uncertainties of such measurements in deep-inelastic scattering compare with those from measurements in the timelike domain, e.g. at the Z-pole, and which aspects of the electroweak interaction are unique to measurements at the LHeC, for instance electroweak parameters in charged-current interactions. We conclude that the LHeC will determine electroweak physics parameters, in the spacelike region, with unprecedented precision leading to thorough tests of the Standard Model and possibly beyond.

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Global fits of the SM parameters

Cited by 3 publications

References 61 publications

The Large Hadron–Electron Collider at the HL-LHC

The Large Hadron–Electron Collider at the HL-LHC

Electroweak physics in inclusive deep inelastic scattering at the LHeC

Electroweak Physics in Inclusive Deep Inelastic Scattering at the LHeC

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