Observation of the <math display="inline"><mi>J</mi><mo>/</mo><mi>ψ</mi><mo stretchy="false">→</mo><msup><mi>μ</mi><mo>+</mo></msup><msup><mi>μ</mi><mo>-</mo></msup><msup><mi>μ</mi><mo>+</mo></msup><msup><mi>μ</mi><mo>-</mo></msup></math> decay in proton-proton collisions at <math display="inline"><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math>

Jain, Sandhya;Benecke, Anna;Bethani, Agni;Bruno, Giacomo;CMS;et.al.
(2024) Physical review D — Vol. 109 (2024)

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Abstract
The <math display="inline"><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow><mo stretchy="false">→</mo><mrow><msup><mi>μ</mi><mo>+</mo></msup></mrow><mrow><msup><mi>μ</mi><mo>-</mo></msup></mrow><mrow><msup><mi>μ</mi><mo>+</mo></msup></mrow><mrow><msup><mi>μ</mi><mo>-</mo></msup></mrow></math> decay has been observed with a statistical significance in excess of five standard deviations. The analysis is based on an event sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the CMS experiment in 2018 and corresponding to an integrated luminosity of <math display="inline"><mn>33.6</mn><mtext> </mtext><mtext> </mtext><msup><mi>fb</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. Normalizing to the <math display="inline"><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow><mo stretchy="false">→</mo><mrow><msup><mi>μ</mi><mo>+</mo></msup></mrow><mrow><msup><mi>μ</mi><mo>-</mo></msup></mrow></math> decay mode leads to a branching fraction of <math display="inline"><mo stretchy="false">[</mo><msubsup><mn>10.1</mn><mrow><mo>-</mo><mn>2.7</mn></mrow><mrow><mo>+</mo><mn>3.3</mn></mrow></msubsup><mrow><mrow><mo stretchy="false">(</mo><mi>stat</mi><mo stretchy="false">)</mo></mrow></mrow><mo>±</mo><mn>0.4</mn><mrow><mrow><mo stretchy="false">(</mo><mi>syst</mi><mo stretchy="false">)</mo></mrow></mrow><mo stretchy="false">]</mo><mo>×</mo><msup><mn>10</mn><mrow><mo>-</mo><mn>7</mn></mrow></msup></math>, a value that is consistent with the standard model prediction.
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Jain, S., Benecke, A., Bethani, A., Bruno, G., Caputo, C., de Favereau de Jeneret, J., Delaere, C., Donertas, I. S., Giammanco, A., Guzel, A. O., Jain, S., Lemaitre, V., Lidrych, J., Mastrapasqua, P., Tran, T. T., Wertz, S., CMS, & et al. (2024). Observation of the <math display=“inline”><mi>J</mi><mo>/</mo><mi>ψ</mi><mo stretchy=“false”>→</mo><msup><mi>μ</mi><mo>+</mo></msup><msup><mi>μ</mi><mo>-</mo></msup><msup><mi>μ</mi><mo>+</mo></msup><msup><mi>μ</mi><mo>-</mo></msup></math> decay in proton-proton collisions at <math display=“inline”><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math>. Physical review D, 109. https://doi.org/10.1103/PhysRevD.109.L111101 (Original work published 2024)