Information
LHCb-PAPER-2022-046
CERN-EP-2022-277
arXiv:2212.09152 [PDF]
(Submitted on 18 Dec 2022)
Phys. Rev. Lett. 131 (2023) 051803
Inspire 2615983
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Abstract
The first simultaneous test of muon-electron universality using $B^{+}\rightarrow K^{+}\ell^{+}\ell^{-}$ and $B^{0}\rightarrow K^{*0}\ell^{+}\ell^{-}$ decays is performed, in two ranges of the dilepton invariant-mass squared, $q^{2}$. The analysis uses beauty mesons produced in proton-proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 $\mathrm{fb}^{-1}$. Each of the four lepton universality measurements reported is either the first in the given $q^{2}$ interval or supersedes previous LHCb measurements. The results are compatible with the predictions of the Standard Model.
Figures and captions
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Variation of efficiency corrected ratios (top row, left to right): $ r_{ { J \mskip -3mu/\mskip -2mu\psi } }^{ K }$ , $ R_{\psi {(2S)} }^{ K }$ , $ R_K$ in low- and $\text{central-} q^2 $ regions; (bottom row) analogous plots for the $ K ^{*0}$ channel. Measurements are relative to the final value for the given observable. The simulation calibration using $ B ^0$ and $ B ^+$ chains for successive calibration weights are shown and almost indistinguishable. |
Fig1.pdf [178 KiB] Thumbnail [205 KiB] *.C file |
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Invariant mass distributions of the nonresonant (left) $ B ^+ \rightarrow K ^+ e ^+ e ^- $ and (right) $ B ^0 \rightarrow K ^{*0} e ^+ e ^- $ candidates in (upper) $\text{central-} q^2 $ and (lower) $\text{low-} q^2 $ regions. The results of the fit described in the text are also presented. |
Fig2.pdf [412 KiB] Thumbnail [408 KiB] *.C file |
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Created on 20 April 2024.