Measurement of the cross sections for $e^{+}{e}^{-}\to \eta {\pi }^{+}{\pi }^{-}$ at center-of-mass energies between 2.00 and 3.08 GeV

Abstract

Using data samples collected at center-of-mass energies between 2.000 and 3.080 GeV with the BESIII detector operating at the BEPCII collider, a partial-wave analysis is performed on the process $e^{+}{e}^{-}\to \eta {\pi }^{+}{\pi }^{-}$. In addition to the dominant $e^{+}{e}^{-}\to \rho \eta$ component, the $e^{+}{e}^{-}\to a_2(1320)\pi$ process is also sizeable, contributing up to 24% of the total reaction. The measured cross sections of the process $e^{+}{e}^{-}\to \eta {\pi }^{+}{\pi }^{-}$ are systematically higher than those of BaBar by more than $3\sigma$ at center-of-mass energies between 2.000 and 2.300 GeV. In the cross section lineshape for $e^{+}{e}^{-}\to a_2(1320)\pi$, a resonant structure is observed with a significance of $5.5\sigma$, with $M=(2044\pm 31\pm 4)$ MeV/$c^2$, $\Gamma =(163\pm 69\pm 24)$ MeV and ${\mathcal{B}}_{\mathcal{R}}\cdot {\Gamma }_{e^{+}{e}^{-}}^R=(34.6\pm 17.1\pm 6.0)$ eV or $(137.1\pm 73.3\pm 2.1)$ eV. In the cross section lineshape for $e^{+}{e}^{-}\to \rho \eta$, an evidence of a dip structure around 2180 MeV/$c^2$ is observed with statistical significance of $3.0\sigma$.

References in corpus (30)

• Design and Construction of the BESIII Detector
• The anomalous magnetic moment of the muon in the Standard Model
• Leading hadronic contribution to the muon magnetic moment from lattice QCD
• The muon $g-2$ and $\alpha (M_Z^2)$: a new data-based analysis
• Reevaluation of the hadronic vacuum polarisation contributions to the Standard Model predictions of the muon g-2 and alpha(mZ) using newest hadronic cross-section data
• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm
• Quest for precision in hadronic cross sections at low energy: Monte Carlo tools vs. experimental data
• Four Sorts of Mesons
• Search for hadronic transition ${\chi }_{cJ}\to {\eta }_c{\pi }^{+}{\pi }^{-}$ and observation of ${\chi }_{cJ}\to K\bar{K}\pi \pi \pi$
• Matching perturbative and Parton Shower corrections to Bhabha process at flavour factories
• The $e^{+}{e}^{-}\to 2({\pi }^{+}{\pi }^{-}){\pi }^0$, 2(π^+π^-)η$,$K^+ K^-π^+π^-π^0$and$K^+ K^-π^+π^-η$ Cross Sections Measured with Initial-State Radiation
• Measurement of $e^{+}{e}^{-}\to K^{+}{K}^{-}$ cross section at $\sqrt{s}=2.00-3.08$ GeV
• Study of the process e+e- to pi+pi-pi+pi-pi0 with CMD-2 detector
• Luminosity measurements for the R scan experiment at BESIII
• Combined analysis of meson channels with I=1, C = -1 from 1940 to 2410 MeV
• Observation of a resonant structure in $e^{+}{e}^{-}\to K^{+}{K}^{-}{\pi }^0{\pi }^0$
• Observation of a resonant structure in $e^{+}{e}^{-}\to \omega \eta$ and another in $e^{+}{e}^{-}\to \omega {\pi }^0$ at center-of-mass energies between 2.00 and 3.08 GeV
• Study of the process $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\eta$ using initial state radiation
• Towards two-body strong decay behavior of higher $\rho$ and ${\rho }_3$ mesons
• Measurement of the $e^{+}{e}^{-}\to \eta {\pi }^{+}{\pi }^{-}$ cross section in the center-of-mass energy range 1.22--2.00 GeV with the SND detector at the VEPP-2000 collider
• Study of the near-threshold $\omega \varphi$ mass enhancement in doubly OZI suppressed $J/\psi \to \gamma \omega \varphi$ decays
• Tuning and validation of hadronic event generator for $R$ value measurements in the tau-charm region
• The Muon g-2 in Progress
• Measurement of the Born cross sections for $e^{+}{e}^{-}\to {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ at center-of-mass energies between $2.00$ and $3.08$ GeV
• Reply to "Comment on 'Systematics of radial and angular-momentum Regge trajectories of light non-strange qqbar-states' "
• Measurement of the $e^{+}{e}^{-}\to \eta {\pi }^{+}{\pi }^{-}$ cross section with the SND detector at the VEPP-2000 collider
• Comments on `Systematics of radial and angular-momentum Regge trajectories of light non-strange $q\bar{q}$ states', Masjuan, Arriola and Broniowski
• Measurement of the $e^{+}{e}^{-}\to \eta {\pi }^{+}{\pi }^{-}$ cross section with the CMD-3 detector at the VEPP-2000 collider
• Search for a strangeonium-like structure $Z_s$ decaying into $\varphi \pi$ and a measurement of the cross section $e^{+}{e}^{-}\to \varphi \pi \pi$
• Assignments of the $Y(2040)$, $\rho (1900)$, and $\rho (2150)$ in the quark model

Cited by in corpus (3)

• Role of $4S$-$3D$ mixing in explaining the $\omega$-like $Y(2119)$ observed in $e^{+}{e}^{-}\to \rho \pi$ and $\rho (1450)\pi$
• Algorithms for partial wave amplitudes under covariant $L$-$S$ scheme
• Decoding the role of $\rho$ mesonic states for elucidating the $e^{+}{e}^{-}\to a_2(1320)\pi$ data and other reactions