Search for New Resonances Decaying to Pairs of Merged Diphotons 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.
(2025) Physical Review Letters — Vol. 134 (2025)

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Abstract
A search is presented for an extended Higgs sector with two new particles, <math display="inline"><mi>X</mi></math> and <math display="inline"><mi>ϕ</mi></math>, in the process <math display="inline"><mrow><mi>X</mi><mo stretchy="false">→</mo><mi>ϕ</mi><mi>ϕ</mi><mo stretchy="false">→</mo><mo stretchy="false">(</mo><mi>γ</mi><mi>γ</mi><mo stretchy="false">)</mo><mo stretchy="false">(</mo><mi>γ</mi><mi>γ</mi><mo stretchy="false">)</mo></mrow></math>. Novel neural networks classify events with diphotons that are merged and determine the diphoton masses. The search uses LHC proton-proton collision data 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> collected with the CMS detector, corresponding to an integrated luminosity of <math display="inline"><mn>138</mn><mtext> </mtext><mtext> </mtext><msup><mi>fb</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. No evidence of such resonances is seen. Upper limits are set on the production cross section for <math display="inline"><msub><mi>m</mi><mi>X</mi></msub></math> between 300 and 3000 GeV and <math display="inline"><msub><mi>m</mi><mi>ϕ</mi></msub><mo>/</mo><msub><mi>m</mi><mi>X</mi></msub></math> between 0.5% and 2.5%, representing the most sensitive search in this channel.
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Benecke, A., Bethani, A., Bruno, G., Caputo, C., Delaere, C., Donertas, I. S., Giammanco, A., Jain, S., Jain, S., Lemaitre, V., Lidrych, J., Mastrapasqua, P., Tran, T. T., Wertz, S., CMS, & et al. (2025). Search for New Resonances Decaying to Pairs of Merged Diphotons 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.134.041801 (Original work published 2025)