Precision measurement of the Z boson invisible width in pp collisions at <math altimg="si1.svg"><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>13</mn></math> TeV

Benecke, Anna;Bethani, Agni;Bruno, Giacomo;Bury, Florian;CMS;et.al.
(2023) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 842 (2023)

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Authors
  • Benecke, AnnaUCLouvain
    Author
  • Bethani, Agniorcid-logoUCLouvain
    Author
  • Bruno, GiacomoUCLouvain
    Author
  • Bury, FlorianUCLouvain
    Author
  • Caputo, ClaudioUCLouvain
    Author
  • David, PieterUCLouvain
    Author
  • Delaere, Christopheorcid-logoUCLouvain
    Author
  • Donertas, Izzeddin SuatUCLouvain
    Author
  • Giammanco, AndreaUCLouvain
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  • Jaffel, KhawlaUCLouvain
    Author
  • Jain, SandhyaUCLouvain
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  • Lemaitre, VincentUCLouvain
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  • Mondal, KuntalUCLouvain
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  • Prisciandaro, JessicaUCLouvain
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  • Taliercio, AngelaUCLouvain
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  • Teklishyn, MaksymUCLouvain
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  • Tran, Tu ThongUCLouvain
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  • Vischia, PietroUCLouvain
    Author
  • Wertz, SébastienUCLouvain
    Author
  • CMS
    Author
  • et. al.
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Abstract
A precise measurement of the invisible width of the Z boson produced in proton-proton collisions at a center-of-mass energy of 13 TeV is presented using data marc:recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 36.3<math altimg="si2.svg"><mspace width="0.2em"/><msup><mrow><mtext>fb</mtext></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>1</mn></mrow></msup></math>. The result is obtained from a simultaneous fit to kinematic distributions for two data samples of Z boson plus jets: one dominated by Z boson decays to invisible particles and the other by Z boson decays to muon and electron pairs. The invisible width is measured to be <math altimg="si3.svg"><mn>523</mn><mo>±</mo><mn>3</mn><mspace width="0.2em"/><mtext>(stat)</mtext><mo>±</mo><mn>16</mn><mspace width="0.2em"/><mtext>(syst)</mtext><mspace width="0.2em"/><mtext>MeV</mtext></math>. This result is the first precise measurement of the invisible width of the Z boson at a hadron collider, and is the single most precise direct measurement to date, competitive with the combined result of the direct measurements from the LEP experiments.
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Benecke, A., Bethani, A., Bruno, G., Bury, F., Caputo, C., David, P., Delaere, C., Donertas, I. S., Giammanco, A., Jaffel, K., Jain, S., Lemaitre, V., Mondal, K., Prisciandaro, J., Taliercio, A., Teklishyn, M., Tran, T. T., Vischia, P., Wertz, S., et al. (2023). Precision measurement of the Z boson invisible width in pp collisions at <math altimg=“si1.svg”><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak=“goodbreak” linebreakstyle=“after”>=</mo><mn>13</mn></math> TeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 842. https://doi.org/10.1016/j.physletb.2022.137563 (Original work published 2023)