Search for charged Higgs bosons decaying via H± → τ±ντ in the τ+jets and τ+lepton final states with 36 fb-1 of pp collision data recorded at $ \sqrt{s}=13 $ TeV with the ATLAS experiment

• Published in: The journal of high energy physics 2018-09, Vol.2018 (9)
• Main Authors: Adersberger, M., Anders, J. K., Andrei, V., Barbero, M., Beddall, A., Benjamin, D. P., Bensinger, J. R., Berlendis, S., Bertella, C., Black, K. M., Blumenschein, U., Blunier, Dr, Bocchetta, S. S., Bogavac, D., Boisvert, V., Bolz, A. E., Bossio Sola, J. D., Braren, F., Britton, D., Broughton, J. H., Buckley, A. G., Calvet, D., Cardillo, F. C., Carlino, G., Castro, N. F., Coimbra, A. E. C., Croft, V., Danninger, M., Denisov, S. P., Di Ciaccio, A., Dietrich, J., Duflot, L., Fabbri, L., Feigl, S., Fischer, C., Gagliardi, G., Gramling, J., Grimm, K., Guan, W., Guzik, M. P., Hansen, J. D., Iconomidou-Fayard, L., Johnson, C. A., Kaczmarska, A., Kaplan, B., Kataoka, Y., Kawade, K., Khader, M., Kocian, M., Koenig, P. T., Koffeman, E., Kourkoumelis, C., Kuna, M., Kwan, T., Langenberg, R. J., Lu, Y. J., Masubuchi, T., McClymont, L. I., Moa, T., Morgenstern, S., Neumann, M., Nurse, E., Oberlack, H., Obermann, T., Ochi, A., Oren, Y., Paolozzi, L., Parida, B., Parker, M. A., Parodi, F., Pathak, A., Penc, O., Pernegger, H., Petrucci, F., Pitt, M., Ponomarenko, D., Rahal, G., Reichert, J., Richter, S., Rizvi, E., Rossini, L., Ryzhov, A., Sannino, M., Savic, N., Schernau, M., Smart, B. H., Solar, M., Sugaya, Y., Suster, C. J. E., Taenzer, J., Tahirovic, E., Tolley, E., Valderanis, C., Wilkens, H. G., Williams, S., Xella, S., Xu, H., Yamane, F., Zacharis, G., Zeitnitz, C.
• Format: Article
• Language: English
• Subjects: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP09(2018)139

Charged Higgs bosons produced either in top-quark decays or in association with a top-quark, subsequently decaying via H± → τ±ντ, are searched for in 36.1 fb-1 of proton-proton collision data at $ \sqrt{s}=13 $ TeV recorded with the ATLAS detector. Depending on whether the top-quark produced together with H± decays hadronically or leptonically, the search targets τ+jets and τ+lepton final states, in both cases with a hadronically decaying τ-lepton. No evidence of a charged Higgs boson is found. For the mass range of mH± = 90–2000 GeV, upper limits at the 95% confidence level are set on the production cross-section of the charged Higgs boson times the branching fraction β(H±→ τ±ντ) in the range 4.2–0.0025 pb. In the mass range 90–160 GeV, assuming the Standard Model cross-section for $ t\bar{t} $ production, this corresponds to upper limits between 0.25% and 0.031% for the branching fraction β(t→bH±)×β(H±→τ±ντ).