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Search for a light charged Higgs boson in t→H±b decays, with H±→cs, in pp collisions at s=13TeV with the ATLAS detector

Publicado en:European Physical Journal c. 85 (2): - 2025-02-01 85(2), DOI: 10.1140/epjc/s10052-024-13715-4

Autores: Zwalinski L; Zou W; Zormpa O; Zorbas TG; Zoch K; Zoccoli A; Živković L; Ziolkowski M; Zinsser J; Zimine NI; Zhukov K; Zhuang X; Zhu Y; Zhu Y; Zhu X; Zhu J; Zhu CG; Zhou Y; Zhou Y; Zhou Y; Zhou N; Zhou H; Zhou B; Zhong D; Zheng Z; Zheng X; Zheng K; Zheng J; Zhemchugov A; Zhao Z; Zhao Z; Zhao Y; Zhao T; Zhao H; Zhang Z; Zhang Z; Zhang Z; Zhang Y; Zhang Y; Zhang Y; Zhang X; Zhang X; Zhang T; Zhang S; Zhang S; Zhang R; Zhang P; Zhang L; Zhang L; Zhang K; Zhang J; Zhang J; Zhang DF; Zhai M; Zerwas D; Zerradi S; Zenz S; Ženiš T; Zenin O; Zenger DT; Zeng JC; Zeng H; Zeitnitz C; Zaplatilek O; Zanzi D; Zang J; Saa JAZ; Zambito S; Zakareishvili T; Zak ZK; Zaid E; Zabinski B; Zaazoua M; Yue L; Yuan R; Yuan M; Yuan J; Yu Y; Yu C; Young C; Young CJS; Younas S; Yorita K; Yin P; Yildirim TP; Yexley MR; Yeo B; Yeletskikh I; Yeh Y; Ye X; Ye S; Ye J; Ye H; Ye H; Yao WM; Yang Z; Yang Y; Yang Y; Yang X; Yang X

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Resumen

A search for a light charged Higgs boson produced in decays of the top quark, t→H±b with H±→cs, is presented. This search targets the production of top-quark pairs tt¯→WbH±b, with W→ℓν (ℓ=e,μ), resulting in a lepton-plus-jets final state characterised by an isolated electron or muon and at least four jets. The search exploits b-quark and c-quark identification techniques as well as multivariate methods to suppress the dominant tt¯ background. The data analysed correspond to 140fb-1 of pp collisions at s=13TeV recorded with the ATLAS detector at the LHC between 2015 and 2018. Observed (expected) 95% confidence-level upper limits on the branching fraction B(t→H±b), assuming B(t→Wb)+B(t→H±(→cs)b)=1.0, are set between 0.066% (0.077%) and 3.6% (2.3%) for a charged Higgs boson with a mass between 60 and 168 GeV.

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