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Title: | Search for a light pseudoscalar Higgs boson in the boosted μμττ final state in proton-proton collisions at √s = 13 TeV |
Authors: | Sirunyan, AM Tumasyan, A Adam, W Ambrogi, F Bergauer, T Dragicevic, M Erö, J Escalante Del Valle, A Frühwirth, R Jeitler, M Krammer, N Van Mulders, P Beghin, D Bilin, B Clerbaux, B De Lentdecker, G Delannoy, H Dorney, B Favart, L Grebenyuk, A Kalsi, AK Makarenko, I Moureaux, L Pétré, L Popov, A Postiau, N Starling, E Thomas, L Vander Velde, C Vanlaer, P Vannerom, D Wezenbeek, L Cornelis, T Dobur, D Zahid, S Khvastunov, I Niedziela, M Roskas, C Skovpen, K Tytgat, M Verbeke, W Teodorescu, L Vermassen, B Vit, M Bruno, G Bury, F Caputo, C Reid, ID David, P Delaere, C Delcourt, M Donertas, IS Giammanco, A Lemaitre, V Prisciandaro, J Saggio, A Taliercio, A Mackay, CK Teklishyn, M Vischia, P Wuyckens, S Kyberd, P Zobec, J Alves, GA Khan, A Correia Silva, G Hobson, PR Cole, JE Lechner, L Liko, D Madlener, T Mikulec, I Rad, N Schieck, J Schöfbeck, R Spanring, M Templ, S Waltenberger, W Wulz, CE Zarucki, M Chekhovsky, V Litomin, A Makarenko, V Suarez Gonzalez, J Darwish, MR De Wolf, EA Di Croce, D Janssen, X Kello, T Lelek, A Pieters, M Rejeb Sfar, H Van Haevermaet, H Van Mechelen, P Van Putte, S Van Remortel, N Blekman, F Bols, ES Chhibra, SS D’Hondt, J De Clercq, J Lontkovskyi, D Lowette, S Marchesini, I Moortgat, S Python, Q Tavernier, S Van Doninck, W |
Keywords: | Beyond Standard Model;Hadron-Hadron scattering (experiments);Higgs physics |
Issue Date: | 27-Aug-2020 |
Publisher: | Springer Nature |
Citation: | Sirunyan, A.M., Tumasyan, A., Adam, W. et al. Search for a light pseudoscalar Higgs boson in the boosted μμττ final state in proton-proton collisions at 𝑠√ = 13 TeV. Journal of High Energy Physics. 2020, 139 (2020). https://doi.org/10.1007/JHEP08(2020)139 |
Abstract: | © 2020, The Author(s). A search for a light pseudoscalar Higgs boson (a) decaying from the 125 GeV (or a heavier) scalar Higgs boson (H) is performed using the 2016 LHC proton-proton collision data at s = 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1, collected by the CMS experiment. The analysis considers gluon fusion and vector boson fusion production of the H, followed by the decay H → aa → μμττ, and considers pseudoscalar masses in the range 3.6 < ma< 21 GeV. Because of the large mass difference between the H and the a bosons and the small masses of the a boson decay products, both the μμ and the ττ pairs have high Lorentz boost and are collimated. The ττ reconstruction efficiency is increased by modifying the standard technique for hadronic τ lepton decay reconstruction to account for a nearby muon. No significant signal is observed. Model-independent limits are set at 95% confidence level, as a function of ma, on the branching fraction (ℬ) for H → aa → μμττ, down to 1.5 (2.0) × 10−4 for mH = 125 (300) GeV. Model-dependent limits on ℬ(H → aa) are set within the context of two Higgs doublets plus singlet models, with the most stringent results obtained for Type-III models. These results extend current LHC searches for heavier a bosons that decay to resolved lepton pairs and provide the first such bounds for an H boson with a mass above 125 GeV. [Figure not available: see fulltext.]. |
URI: | https://bura.brunel.ac.uk/handle/2438/21630 |
DOI: | https://doi.org/10.1007/JHEP08(2020)139 |
ISSN: | 1126-6708 1029-8479 |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
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