Event generators for \$\eta/\eta^\prime\$ decays on BESIII
(Mar 29, 2017)Abstract
The light unflavoured meson \$\eta/\eta^\prime\$ decays are valuable for
testing non-perturbation quantum chromodynamics and exploring new physics
beyond the Standard Model. The proper \$\eta/\eta'\$ generators will help to
obtain detection efficiencies and suppress backgrounds in BESIII physics. In
this paper, we develop a series of event generators on the BESIII detector to
study the decays of \$\eta/\eta^\prime\tol^+l^-\$,
\$\eta/\eta^\prime\to\pi^+\pi^-\$, \$\eta^\prime\toømega
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'\to\pi^+\pi^-\pi^+\pi^-/\pi^+\pi^-\pi^0\pi^0\$. Monte Carlo simulation
distributions show that all event generators are performing very well. The
consistence between our simulation distributions and the BESIII results examine
the usability of the \$\eta/\eta^\prime\$ generators which can be also used in
other \$\eta/\eta^\prime\$ factories and improved by further experiment
results.