Publications [#383589] of Ashutosh V. Kotwal

Papers Published
  1. 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, X; Zhu, J; Zhu, CG; Zhou, Y; Zhou, N; Zhou, H; Zhou, B; Zhong, D; Zheng, Z; Zheng, X; Zheng, K; Zheng, J; Zhemchugov, A; Zhao, Z; Zhao, Y; Zhao, T; Zhao, H; Zhang, Z; Zhang, Y; Zhang, X; Zhang, T; Zhang, S; Zhang, R; Zhang, P; Zhang, L; Zhang, K; 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; Zanzottera, R; Zanzi, D; Zang, J; Saa, JAZ; Zambito, S; Zakareishvili, T; Zak, ZK; Zaid, E; Zahir, I; 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; Yao, WM; Yang, Y; Yang, X, Reconstruction and identification of pairs of collimated τ-leptons decaying hadronically using s=13 TeV pp collision data with the ATLAS detector, European Physical Journal C, vol. 85 no. 5 (May, 2025) [doi] .

    Abstract:
    This paper describes an algorithm for reconstructing and identifying a highly collimated hadronically decaying τ-lepton pair with low transverse momentum. When two τ-leptons are highly collimated, their visible decay products might overlap, degrading the reconstruction performance for each of the τ-leptons. A dedicated treatment attempting to tag the τ-lepton pair as a single object is required. The reconstruction algorithm is based on a large radius jet and its associated two leading subjets, and the identification uses a boosted decision tree to discriminate between signatures from τ+τ- systems and those arising from QCD jets. The efficiency of the identification algorithm is measured in Zγ events using proton–proton collision data at s=13 TeV collected by the ATLAS experiment at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139fb-1. The resulting data-to-simulation scale factors are close to unity with uncertainties ranging from 26 to 37%.

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