Search for Leptonic Decays of Dark Photons at NA62
(2024) Physical Review Letters — Vol. 133 (2024)
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- Abstract
- The NA62 experiment at CERN, configured in beam-dump mode, has searched for dark photon decays in flight to electron-positron pairs using a sample of <math display="inline"><mn>1.4</mn><mo>×</mo><msup><mn>10</mn><mn>17</mn></msup></math> protons on dump collected in 2021. No evidence for a dark photon signal is observed. The combined result for dark photon searches in lepton–antilepton final states is presented and a region of the parameter space is excluded at 90% confidence level, improving on previous experimental limits for dark photon mass values between 50 and <math display="inline"><mrow><mn>600</mn><mtext> </mtext><mtext> </mtext><mi>MeV</mi><mo>/</mo><msup><mrow><mi>c</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math> and coupling values in the range <math display="inline"><msup><mn>10</mn><mrow><mo>-</mo><mn>6</mn></mrow></msup></math> to <math display="inline"><mn>4</mn><mo>×</mo><msup><mn>10</mn><mrow><mo>-</mo><mn>5</mn></mrow></msup></math>. An interpretation of the <math display="inline"><msup><mi>e</mi><mo>+</mo></msup><msup><mi>e</mi><mo>-</mo></msup></math> search result in terms of the emission and decay of an axionlike particle is also presented.
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Citations
Cortina Gil, E., Jerhot, J., Kleimenova, A., Lurkin, N., Zamkovsky, M., NA62, & et al. (2024). Search for Leptonic Decays of Dark Photons at NA62. Physical Review Letters, 133. https://doi.org/10.1103/PhysRevLett.133.111802 (Original work published 2024)