Photoproduction of ${\pi }^{+}{\pi }^{-}$ meson pairs on the proton

Abstract

The exclusive reaction $\gamma p\to p{\pi }^{+}{\pi }^{-}$ was studied in the photon energy range 3.0 - 3.8 GeV and momentum transfer range $0.4<-t<1.0$ GeV${}^2$. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. In this kinematic range the integrated luminosity was about 20 pb${}^{-1}$. The reaction was isolated by detecting the ${\pi }^{+}$ and proton in CLAS, and reconstructing the ${\pi }^{-}$ via the missing-mass technique. Moments of the di-pion decay angular distributions were derived from the experimental data. Differential cross sections for the $S$, $P$, and $D$-waves in the $M_{{\pi }^{+}{\pi }^{-}}$ mass range $0.4-1.4$ GeV were derived performing a partial wave expansion of the extracted moments. Besides the dominant contribution of the $\rho (770)$ meson in the $P$-wave, evidence for the $f_0(980)$ and the $f_2(1270)$ mesons was found in the $S$ and $D$-waves, respectively. The differential production cross sections $d\sigma /dt$ for individual waves in the mass range of the above-mentioned mesons were extracted. This is the first time the $f_0(980)$ has been measured in a photoproduction experiment.

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Cited by in corpus (27)

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• Presenting Unbinned Differential Cross Section Results
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• Moments of angular distribution and beam asymmetries in $\eta {\pi }^0$ photoproduction at GlueX
• Evaluation of the polarization observables I^S and I^C in the reaction gamma p --> pi^0 eta p
• On the chiral covariant approach to $\rho \rho$ scattering
• Exclusive tensor meson photoproduction
• Photoproduction of the $f_2(1270)$ resonance
• Photoproduction of the $f_2^{\prime }(1525)$ and $K_2^{\ast }(1430)$
• Tensor meson photoproduction as a final state interaction effect
• Photoproduction and mixing effects of scalar a0 and f0 mesons
• Photoproduction of $K^{+}{K}^{-}$ meson pairs on the proton
• Photoproduction of the $f_2(1270)$ meson using the CLAS detector
• Tensor meson couplings in AdS/QCD
• P-wave pi pi amplitude from dispersion relations
• Theory of two-pion photo- and electroproduction off the nucleon
• Phenomenological model of multiphoto-production of charged pion pairs on the proton
• Meson resonances in forward-angle ${\pi }^{+}{\pi }^{-}$ photoproduction
• Photoproduction of $f_0(980)$ and $f_0(1500)$ resonances off a proton target
• $\bar{K}$ induced formation of the $f_0(980)$ and $a_0(980)$ resonances on proton targets
• Photoproduction of the scalar mesons $f_0(500)$ and $f_0(980)$ off the nucleon
• Mass-dependent cuts in longitudinal phase space
• Direct vs. final state tensor meson photoproduction - amplitude analysis
• $\bar{K}$ -induced formation of the $f_2(1270)$ and $f_2^{{}^{\prime }}(1525)$ resonances on proton targets
• Photoproduction of the Scalar Meson $f_0(500)$