Event generators for $\eta /{\eta }^{\prime }$ decays at BESIII

Abstract

The light unflavoured meson $\eta /{\eta }^{\prime }$ decays are valuable for testing non-perturbative quantum chromodynamics and exploring new physics beyond the Standard Model. This paper describes a series of event generators, including $\eta /{\eta }^{\prime }\to \gamma l^{+}{l}^{-}$, $\eta /{\eta }^{\prime }\to \gamma {\pi }^{+}{\pi }^{-}$, ${\eta }^{\prime }\to \omega e^{+}{e}^{-}$, $\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0$, $\eta /{\eta }^{\prime }\to {\pi }^0{\pi }^0{\pi }^0$, ${\eta }^{\prime }\to \eta \pi \pi$ and ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}/{\pi }^{+}{\pi }^{-}{\pi }^0{\pi }^0$, which have been developed for investigating $\eta /{\eta }^{\prime }$ decay dynamics. For most of these generators, their usability has been validated in BESIII analyses for determining the detection efficiency, and background studies. The consistency between data and Monte Carlo shows that these generators work well in the BESIII simulation, and will also be useful for ongoing BESIII analyses and other experiments for studying $\eta /{\eta }^{\prime }$ physics.

References in corpus (38)

• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations
• ππscattering
• Hidden Local Symmetry at Loop -- A New Perspective of Composite Gauge Boson and Chiral Phase Transition
• Measurement of e+e- -> pi+pi- cross section with CMD-2 around rho-meson
• Study of the electromagnetic transition form-factors in η-> μ^+μ^-γand ω-> μ^+μ^-π^0 decays with NA60
• Dilepton Spectra from Decays of Light Unflavored Mesons
• Dispersive analysis for $\eta \to \gamma {\gamma }^{\ast }$
• First observation of $\eta (1405)$ decays into $f_0(980){\pi }^0$
• Model-independent approach to eta -> pi+ pi- gamma and eta' -> pi+ pi- gamma
• Analytical dispersive construction of $\eta \to 3\pi$ amplitude: First order in isospin breaking
• Precision study of the $\eta \to {\mu }^{+}{\mu }^{-}\gamma$ and $\omega \to {\mu }^{+}{\mu }^{-}{\pi }^0$ electromagnetic transition form-factors and of the $\rho \to {\mu }^{+}{\mu }^{-}$ line shape in NA60
• Three-body Final State Interaction in $\eta \to 3\pi$
• Observation of the Dalitz Decay ${\eta }^{\prime }\to \gamma e^{+}{e}^{-}$
• The decay $\eta \to 3\pi$: study of the Dalitz plot and extraction of the quark mass ratio $Q$
• Rescattering effects in eta {\to} 3pi decays
• Measurement of the omega -> pi^0 e^+e^- and eta -> e^+e^-g Dalitz decays with the A2 setup at MAMI
• Extended chiral Khuri-Treiman formalism for $\eta \to 3\pi$ and the role of the $a_0(980)$, $f_0(980)$ resonances
• Determination of the Dalitz plot parameter alpha for the decay eta->3pi^0 with the Crystal Ball at MAMI-B
• A new determination of the eta transition form factor in the Dalitz decay eta -> e^+ e^- gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron
• Electromagnetic transitions in an effective chiral Lagrangian with the eta-prime and light vector mesons
• The branching ratio $\omega \to {\pi }^{+}{\pi }^{-}$ revisited
• Measurement of the Matrix Elements for the Decays $\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0$ and $\eta /{\eta }^{\prime }\to {\pi }^0{\pi }^0{\pi }^0$
• The cusp effect in eta' --> eta pi pi decays
• Three-body final state interaction in $\eta \to 3\pi$ updated
• Anomalous decays of eta' and eta into four pions
• Measurement of the Matrix Element for the Decay ${\eta }^{\prime }\to \eta {\pi }^{+}{\pi }^{-}$
• eta, eta-prime --> pi+ pi- l+ l- in a chiral unitary approach
• Study of ${\eta }^{\prime }\to \eta {\pi }^{+}{\pi }^{-}$ Dalitz plot
• Rare Decays of the ${\eta }^{{}^{\prime }}$
• Allowed Eta Decay Modes and Chiral Symmetry
• Observation of ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ and ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\pi }^0{\pi }^0$
• Measurement of ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{e}^{+}{e}^{-}$ and ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$
• $\eta$-${\eta }^{\prime }$ Mixing in Large-$N_c$ Chiral Perturbation Theory
• Observation of ${\eta }^{\prime }\to \omega e^{+}{e}^{-}$
• Lifetime and mass of rho meson in correlation with magnetic-dimensional reduction
• Search for the weak decay ${\eta }^{\prime }\to K^{\pm }{\pi }^{\mp }$ and precise measurement of the branching fraction $\mathcal{B}(J/\psi \to \varphi {\eta }^{\prime })$
• ${\chi }_c$ decays and the gluon content of the ${\eta }^{\prime }$, $\eta$ mesons

Cited by in corpus (5)

• Measurement of the absolute branching fractions of Jpsi to gamma eta and eta decay modes
• Improved measurements of the Dalitz decays $\eta /{\eta }^{\prime }\to \gamma e^{+}{e}^{-}$
• Electromagnetic Dalitz Decays of $D_{(s)}^{\ast }$ Mesons
• Study of $\eta \to {\pi }^{+}{\pi }^{-}{l}^{+}{l}^{-}$
• Measurement of the double Dalitz decay $\eta \to e^{+}{e}^{-}{e}^{+}{e}^{-}$