Measurement of the forward-backward asymmetry in Z/γ∗ → μ + μ − decays and determination of the effective weak mixing angle

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2015_ jhighenergphys_lhcbcollab_measurement.pdf (808.41 KB)
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URI: http://hdl.handle.net/10347/21696
E-ISSN: 1029-8479
DOI: 10.1007/JHEP11(2015)190

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2015

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Springer
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The forward-backward charge asymmetry for the process qq→Z/γ∗→μ+μ− is measured as a function of the invariant mass of the dimuon system. Measurements are performed using proton proton collision data collected with the LHCb detector at √s=7 and 8 TeV, corresponding to integrated luminosities of 1 fb−1 and 2 fb−1 respectively. Within the Standard Model the results constrain the effective electroweak mixing angle to be sin2θeffW=0.23142±0.00073±0.00052±0.00056, where the first uncertainty is statistical, the second systematic and the third theoretical. This result is in agreement with the current world average, and is one of the most precise determinations at hadron colliders to date

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Electroweak interaction| Forward physics| Hadron-hadron scattering

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Aaij, R., Adeva, B., Adinolfi, M. et al. Measurement of the forward-backward asymmetry in Z/γ∗ → μ + μ − decays and determination of the effective weak mixing angle. J. High Energ. Phys. 2015, 190 (2015). https://doi.org/10.1007/JHEP11(2015)190

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© CERN, for the bene t of the LHCb Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made

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