A search for $K_{\textrm{S(L)}}^0\rightarrow\mu^{+}\mu^{-}\mu^{+}\mu^{-}$ decays is performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.1 $fb^{-1}$. No evidence for signal is found. The 90% confidence level upper limits are the first set for both decays and are $B(K_{\textrm{S}}^0\rightarrow\mu^{+}\mu^{-}\mu^{+}\mu^{-}) < 5.1\times 10^{-12}$ and $B(K_{\textrm{L}}^0\rightarrow\mu^{+}\mu^{-}\mu^{+}\mu^{-}) < 2.3\times 10^{-9}$.
Invariant-mass distribution for the $ K ^0_{\mathrm{S}} \rightarrow \pi^+\pi^-$ selected candidates in the full dataset. The background level is estimated to be at the $1\%$ level or below. |
Kspipi_log.pdf [22 KiB] HiDef png [88 KiB] Thumbnail [49 KiB] *.C file |
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Invariant-mass distribution of the observed $ K ^0_{\mathrm{S}} \rightarrow \mu^+\mu^-\mu^+\mu^-$ candidates in the (left) xTOS trigger category, and (right) TIS trigger category. The blue lines represent the simultaneous fit to both categories, using the exponential functions to represent the background. The expected $ K ^0_{\mathrm{S}} \rightarrow \mu^+\mu^-\mu^+\mu^-$ signal for the branching fraction excluded at 90% C.L. is shown with a dotted red line. |
fit.pdf [21 KiB] HiDef png [201 KiB] Thumbnail [181 KiB] *.C file |
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Animated gif made out of all figures. |
PAPER-2022-035.gif Thumbnail |
Summary of systematic uncertainties. |
Table_1.pdf [49 KiB] HiDef png [83 KiB] Thumbnail [39 KiB] tex code |
Supplementary material full pdf |
supple[..].pdf [112 KiB] |
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This ZIP file contains supplemetary material for the publication LHCb-PAPER-2022-035. The files are: Supplementary.pdf : An overview of the extra figures, with the captions from the paper PDF *.pdf : The figures in PDF format |
Figure1.pdf [22 KiB] HiDef png [88 KiB] Thumbnail [49 KiB] *C file |
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Figure2.pdf [21 KiB] HiDef png [201 KiB] Thumbnail [181 KiB] *C file |
Created on 27 April 2024.