Trigger efficiencies at BES III

Abstract

Trigger efficiencies at BES III were determined for both the J/psi and psi' data taking of 2009. Both dedicated runs and physics datasets are used; efficiencies are presented for Bhabha-scattering events, generic hadronic decay events involving charged tracks, dimuon events and psi' -> pi+pi-J/psi, J/psi -> l+l- events (l an electron or muon). The efficiencies are found to lie well above 99% for all relevant physics cases, thus fulfilling the BES III design specifications.

6 pages, 4 figures

Cited by in corpus (32)

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• Measurement of the integrated luminosity of the data collected at 3.773 GeV by BESIII from 2021 to 2024
• Precision Measurements of $\mathcal{B}[\psi (3686)\to {\pi }^{+}{\pi }^{-}J/\psi ]$ and $\mathcal{B}[J/\psi \to l^{+}{l}^{-}]$
• Partial wave analysis of $J/\psi \to \gamma {\eta }^{\prime }{\eta }^{\prime }$
• Two-photon widths of the ${\chi }_{c0,2}$ states and helicity analysis for $χ_{c2}\arγγ$}
• Precision measurement of the branching fractions of J/psi -> pi+pi-pi0 and psi' -> pi+pi-pi0
• Measurements of $\psi (3686)\to K^{-}\Lambda {\bar{\Xi }}^{+}+c.c.$ and $\psi (3686)\to \gamma K^{-}\Lambda {\bar{\Xi }}^{+}+c.c$
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• Study of $J/\psi$ and $\psi (3686)$ decays to ${\pi }^{+}{\pi }^{-}{\eta }^{\prime }$
• Search for invisible decays of a dark photon using $e^{+}{e}^{-}$ annihilation data at BESIII
• Observation of $\psi (3686)\to n\bar{n}$ and improved measurement of $\psi (3686)\to p\bar{p}$
• Measurement of the integrated luminosity and the center-of-mass energy of the data taken by BESIII at $\sqrt{s}=2.125$ GeV
• Search for the weak decays $J/\psi \to D_s^{(\ast )}e{\nu }_e$
• Observation of $\psi (3686)\to \Xi (1530{)}^0\bar{\Xi }(1530{)}^0$ and $\Xi (1530{)}^0{\bar{\Xi }}^0$
• Improved measurements of two-photon widths of the ${\chi }_{cJ}$ states and helicity analysis for ${\chi }_{c2}\to \gamma \gamma$
• Precision measurements of branching fractions for ${\psi }^{\prime }\to {\pi }^{0}J\psi$ and $\eta J\psi$
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• Measurement of the branching fraction for $\psi (3686)\to \omega K^{+}{K}^{-}$
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