Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/21630
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 Computer Engineering Research Papers

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