https://scholars.lib.ntu.edu.tw/handle/123456789/573589
標題: | Search for a light pseudoscalar Higgs boson in the boosted μμττ final state in proton-proton collisions at √s = 13 TeV | 作者: | KAI-FENG CHEN PAO-TI CHANG RONG-SHYANG LU WEI-SHU HOU |
公開日期: | 2020 | 卷: | 2020 | 期: | 8 | 來源出版物: | Journal of High Energy Physics | 摘要: | 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 (?) for H → aa → μμττ, down to 1.5 (2.0) × 10?4 for mH = 125 (300) GeV. Model-dependent limits on ?(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.]. ? 2020, The Author(s). |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85089987196&doi=10.1007%2fJHEP08%282020%29139&partnerID=40&md5=6be8536da10a74686766ee57afd99b7c https://scholars.lib.ntu.edu.tw/handle/123456789/573589 |
ISSN: | 11266708 | DOI: | 10.1007/JHEP08(2020)139 |
顯示於: | 物理學系 |
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