Abstract

A search is presented for fractionally charged particles with charge below 1$e$, using their small energy loss in the tracking detector as a key variable to observe a signal. The analyzed data set corresponds to an integrated luminosity of 138 fb$^{-1}$ of proton-proton collisions collected at $\sqrt{s}$ = 13 TeV in 2016-2018 at the CERN LHC. This is the first search at the LHC for new particles with charges between $e/$3 and $e$. Masses up to 640 GeV and charges as low as $e/$3 are excluded at 95% confidence level. These are the most stringent limits to date for the considered Drell-Yan-like production mode.

Event yields in 2016BCDEF signal

Data from Figure 4 and Table 2 in the supplementary material.

10.17182/hepdata.146758.v2/t1

Signal yields for the charge scenarios considered in the analysis, as well as their associateds uncertainties.
Event yields in 2016GH signal

Data from Figure 5 and Table 3 in the supplementary material.

10.17182/hepdata.146758.v2/t2

Signal yields for the charge scenarios considered in the analysis, as well as their associateds uncertainties.
Event yields in 2017BCDEF signal

Data from Figure 6 and Table 4 in the supplementary material.

10.17182/hepdata.146758.v2/t3

Signal yields for the charge scenarios considered in the analysis, as well as their associateds uncertainties.
Event yields in 2018ABCD signal

Data from Figure 7 and Table 5 in the supplementary material.

10.17182/hepdata.146758.v2/t4

Signal yields for the charge scenarios considered in the analysis, as well as their associateds uncertainties.
Event yields in 2016BCDEF data

Data from Figure 4 in the supplementary material.

10.17182/hepdata.146758.v2/t5

Distribution of $N_{\text{hits}}^{\text{low dE/dx}}$ in the SR and the CR for the early 2016 data set, as well as for...
Event yields in 2016GH data

Data from Figure 5 in the supplementary material.

10.17182/hepdata.146758.v2/t6

Distribution of $N_{\text{hits}}^{\text{low dE/dx}}$ in the SR and the CR for the late 2016 data set, as well as for...
Event yields in 2017BCDEF data

Data from Figure 6 in the supplementary material.

10.17182/hepdata.146758.v2/t7

Distribution of $N_{\text{hits}}^{\text{low dE/dx}}$ in the SR and the CR for the 2017 data set, as well as for an...
Event yields in 2018ABCD data

Data from Figure 2.

10.17182/hepdata.146758.v2/t8

Distribution of $N_{\text{hits}}^{\text{low dE/dx}}$ in the SR and the CR for the 2018 data set, as well as for an...
2D excluded region

Data from Figure 3.

10.17182/hepdata.146758.v2/t9

Exclusion region (hatched) at 95% CL in the FCP charge-mass plane for the considered signal. The expected exclusion is shown...

Event yields in 2016BCDEF signal

Event yields in 2016GH signal

Event yields in 2017BCDEF signal

Event yields in 2018ABCD signal

Event yields in 2016BCDEF data

Event yields in 2016GH data

Event yields in 2017BCDEF data

Event yields in 2018ABCD data

2D excluded region

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