Measurement of the effective leptonic weak mixing angle - INSPIRE

DataBETA

Measurement of the effective leptonic weak mixing angle

LHCb

Collaboration

Oct 3, 2024

28 pages

Published in:

JHEP 12 (2024) 026

Published: Dec 3, 2024

e-Print:

2410.02502 [hep-ex]

DOI:

10.1007/JHEP12(2024)026

Report number:

LHCb-PAPER-2024-028,
CERN-EP-2024-230

Experiments:

CERN-LHC-LHCb

View in:

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Abstract: (Springer)

Using pp collision data at

\sqrt{s}

= 13 TeV, recorded by the LHCb experiment between 2016 and 2018 and corresponding to an integrated luminosity of 5.4 fb

^{−1}

, the forward-backward asymmetry in the pp → Z/γ

^{*}

→ μ

^{+}

μ

^{−}

process is measured. The measurement is carried out in ten intervals of the difference between the muon pseudorapidities, within a fiducial region covering dimuon masses between 66 and 116 GeV, muon pseudorapidities between 2.0 and 4.5 and muon transverse momenta above 20 GeV. These forward-backward asymmetries are compared with predictions, at next-to-leading order in the strong and electroweak couplings. The measured effective leptonic weak mixing angle is

{\sin}^2{\theta}_{\textrm{eff}}^{\ell }=0.23147\pm 0.00044\pm 0.00005\pm 0.00023,

where the first uncertainty is statistical, the second arises from systematic uncertainties associated with the asymmetry measurement, and the third arises from uncertainties in the fit model used to extract

{\sin}^2{\theta}_{\textrm{eff}}^{\ell }

from the asymmetry measurement. This result is based on an arithmetic average of results using the CT18, MSHT20, and NNPDF31 parameterisations of the proton internal structure, and is consistent with previous measurements and with predictions from the global electroweak fit.[graphic not available: see fulltext]

Note:

All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/3360/ (LHCb public pages)

Electroweak Interaction
Hadron-Hadron Scattering

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