Search for Fractionally Charged Particles in Proton-Proton Collisions at <math display="inline"><mrow><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></mrow></math>

Benecke, Anna;Bruno, Giacomo;Caputo, Claudio;Delaere, Christophe;Bethani, Agni;et.al.
(2025) Physical Review Letters — Vol. 134 (2025)

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Abstract
A search is presented for fractionally charged particles with charges below <math display="inline"><mn>1</mn><mi>e</mi></math>, using their small energy loss in the tracking detector as a key variable to observe a signal. The analyzed dataset corresponds to an integrated luminosity of <math display="inline"><mrow><mn>138</mn><mtext> </mtext><mtext> </mtext><msup><mrow><mi>fb</mi></mrow><mrow><mo>-</mo><mn>1</mn></mrow></msup></mrow></math> of proton-proton collisions collected at <math display="inline"><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math> in 2016–2018 at the CERN LHC. This is the first search at the LHC for new particles with a charge between <math display="inline"><mi>e</mi><mo>/</mo><mn>3</mn></math> and <math display="inline"><mn>0.9</mn><mi>e</mi></math>, including an extension of previous results at a charge of <math display="inline"><mn>2</mn><mi>e</mi><mo>/</mo><mn>3</mn></math>. Masses up to 640 GeV and charges as low as <math display="inline"><mi>e</mi><mo>/</mo><mn>3</mn></math> are excluded at 95% confidence level. These are the most stringent limits to date for the considered Drell-Yan-like production mode.
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Benecke, A., Bruno, G., Caputo, C., Delaere, C., Donertas, I. S., Giammanco, A., Jaffel, K., Jain, S., Lemaitre, V., Lidrych, J., Mastrapasqua, P., Mondal, K., Tran, T. T., Wertz, S., CMS, Bethani, A., & et al. (2025). Search for Fractionally Charged Particles in Proton-Proton Collisions at <math display=“inline”><mrow><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></mrow></math>. Physical Review Letters, 134. https://doi.org/10.1103/PhysRevLett.134.131802 (Original work published 2025)