Determination of electroweak parameters in polarised deep-inelastic scattering at HERA

Andreev, V.; Baghdasaryan, A.; Begzsuren, K.; Belousov, A.; Bolz, A.; Boudry, V.; Brandt, G.; Brisson, V.; Britzger, D.; Buniatyan, A.

doi:10.1140/epjc/s10052-018-6236-8

Determination of electroweak parameters in polarised deep-inelastic scattering at HERA

H1

Collaboration

•

V. Andreev
(
- Lebedev Inst.
)

Jun 4, 2018

36 pages

Published in:

Eur.Phys.J.C 78 (2018) 9, 777

Published: Sep 26, 2018

e-Print:

1806.01176 [hep-ex]

DOI:

10.1140/epjc/s10052-018-6236-8

PDG:

{{\mathit W}}

MASS

Report number:

DESY-18-080

Experiments:

DESY-HERA-H1

View in:

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Abstract: (Springer)

The parameters of the electroweak theory are determined in a combined electroweak and QCD analysis using all deep-inelastic

e^+p

and

e^-p

neutral current and charged current scattering cross sections published by the H1 Collaboration, including data with longitudinally polarised lepton beams. Various fits to Standard Model parameters in the on-shell scheme are performed. The mass of the W boson is determined as

m_W=80.520\pm 0.115~\mathrm {GeV}

. The axial-vector and vector couplings of the light quarks to the Z boson are also determined. Both results improve the precision of previous H1 determinations based on HERA-I data by about a factor of two. Possible scale dependence of the weak coupling parameters in both neutral and charged current interactions beyond the Standard Model is also studied. All results are found to be consistent with the Standard Model expectations.

Note:

36 pages, 8 figures, 18 tables

positron p: deep inelastic scattering
electron p: deep inelastic scattering
coupling: vector
lepton: polarized beam
polarization: longitudinal
electroweak interaction
W: mass: measured
charged current
quantum chromodynamics
scale dependence

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