Search for a resonance decaying into a scalar particle and a Higgs boson in final states with leptons and two photons in proton-proton collisions at s = 13 TeV with the ATLAS detector

• Published in: The journal of high energy physics 2024-10, Vol.2024 (10), p.104
• Main Authors: Abramowicz, H., Affolder, A. A., Allendes Flores, C. A., Alonso, F., Assamagan, K., Bansal, S., Baroncelli, A., Bates, R. L., Berrocal Guardia, A., Bevan, A. J., Bianchi, R. M., Bouchhar, N., Brahimi, N., Brooks, E. M., Buttinger, W., Camincher, C., Chizhov, M. V., Costanzo, D., Crépé-Renaudin, S., Dabrowski, W., Davidek, T., De, K., De Groot, N., Denisov, S. P., Diehl, E. B., Díez Cornell, S., Doglioni, C., Dova, M. T., Einsweiler, K., Fanti, M., Feickert, M., Feng, Z., Fiedler, P., Filmer, E. K., George, S., Gilbert, A. K., Giordani, M. P., Hall, J. J., Hays, J. M., Henderson, R. C. W., Hillier, S. J., Hoecker, A., Huseynov, N., Jiggins, S., Jones, E., Klimek, P., Kostyukhin, V. V., Kovanda, O., Kramberger, G., Krasny, M. W., Lang, V. S., Lin, K., Lipniacka, A., Loch, P., Lohse, T., Lou, X., Martinez Suarez, P., Maurer, J., Mazza, M., McDougall, A. E., Menke, S., Mkrtchyan, T., Nechansky, F., Nedic, L., Neuhaus, F., Novotny, R., Padovano, G., Pandya, H. D., Pilkington, A. D., Quetant, G., Ridouani, S., Roemer, J. T., Sabater Iglesias, J. A., Scanlon, T., Schroer, T., Simpson, N. D., Sioli, M., Smith, E. A., Snyder, S., Stenzel, H., Stoicea, G., Ströhmer, R., Tackmann, K., Theveneaux-Pelzer, T., Timoshenko, S., Tosciri, C., Tovey, D. R., Varol, T., Varouchas, D., Vigl, M., Voss, K., Vreeswijk, M., Wang, T., Winklmeier, F., Yang, H. T., Zamora Saa, J. A., Zhang, P., Zhao, T., Zhu, C. G., Zoch, K.
• Format: Article
• Language: English
• Subjects: Bosons; Classical and Quantum Gravitation; Confidence intervals; Elementary Particles; Higgs bosons; Large Hadron Collider; Leptons; Particle decay; Photons; Physics; Physics and Astronomy; Protons; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Quarks; Regular Article - Experimental Physics; Relativity Theory; Searching; Standard model (particle physics); String Theory
• ISSN: 1029-8479
• DOI: 10.1007/JHEP10(2024)104

A bstract A search for a hypothetical heavy scalar particle, X , decaying into a singlet scalar particle, S , and a Standard Model Higgs boson, H , using 140 fb − 1 of proton-proton collision data at the centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the LHC is presented. The explored mass range is 300 ≤ m X ≤ 1000 GeV and 170 ≤ m S ≤ 500 GeV. The signature of this search is one or two leptons ( e or μ ) from the decay of vector bosons originating from the S particle, S → W ± W ∓ /ZZ , and two photons from the Higgs boson decay, H → γγ . No significant excess is observed above the expected Standard Model background. The observed (expected) upper limits at the 95% confidence level on the cross- section for gg → X → SH , assuming the same S → WW/ZZ branching ratios as for a SM-like heavy Higgs boson, are between 530 (800) fb and 120 (170) fb.