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Search for $K^0_{\mathrm{S(L)}}\to\mu^+\mu^-\mu^+\mu^-$ decays at LHCb

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Abstract

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 $B(K_{\textrm{L}}^0\rightarrow\mu^{+}\mu^{-}\mu^{+}\mu^{-}) < 2.3\times 10^{-9}$.

Figures and captions

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
Kspipi_log.pdf

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
fit.pdf

Animated gif made out of all figures.

PAPER-2022-035.gif
Thumbnail
thumbnail_PAPER-2022-035.gif

Tables and captions

Summary of systematic uncertainties.

Table_1.pdf [49 KiB]
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Thumbnail [39 KiB]
tex code
Table_1.pdf

Supplementary Material [file]

Supplementary material full pdf

supple[..].pdf [112 KiB]
supplementary.pdf

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
Figure1.pdf
Figure2.pdf [21 KiB]
HiDef png [201 KiB]
Thumbnail [181 KiB]
*C file
Figure2.pdf

Created on 23 March 2024.