Search for the <math display="inline"><mi>Z</mi></math> Boson Decay to <math display="inline"><mrow><mi>τ</mi><mi>τ</mi><mi>μ</mi><mi>μ</mi></mrow></math> 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;Bethani, Agni;Bruno, Giacomo;Caputo, Claudio;CMS;et.al.
(2024) Physical Review Letters — Vol. 133 (2024)

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Abstract
The first search for the <math display="inline"><mi>Z</mi></math> boson decay to <math display="inline"><mi>τ</mi><mi>τ</mi><mi>μ</mi><mi>μ</mi></math> at the CERN LHC is presented, based on data collected by the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV and corresponding 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>. The data are compatible with the predicted background. For the first time, an upper limit at the 95% confidence level of 6.9 times the standard model expectation is placed on the ratio of the <math display="inline"><mi>Z</mi><mo stretchy="false">→</mo><mrow><mi>τ</mi><mi>τ</mi><mi>μ</mi><mi>μ</mi></mrow></math> to <math display="inline"><mi>Z</mi><mo stretchy="false">→</mo><mrow><mn>4</mn><mi>μ</mi></mrow></math> branching fractions. Limits are also placed on the six flavor-conserving four-lepton effective-field-theory operators involving two muons and two tau leptons, for the first time testing all such operators.
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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., Jain, S., Lemaitre, V., Lidrych, J., Mastrapasqua, P., Tran, T. T., Wertz, S., CMS, & et al. (2024). Search for the <math display=“inline”><mi>Z</mi></math> Boson Decay to <math display=“inline”><mrow><mi>τ</mi><mi>τ</mi><mi>μ</mi><mi>μ</mi></mrow></math> 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, 133. https://doi.org/10.1103/PhysRevLett.133.161805 (Original work published 2024)