Photoproduction of the $f_1(1285)$ Meson

Abstract

The $f_1(1285)$ meson with mass $1281.0\pm 0.8$ MeV/$c^2$ and width $18.4\pm 1.4$ MeV (FWHM) was measured for the first time in photoproduction from a proton target using CLAS at Jefferson Lab. Differential cross sections were obtained via the $\eta {\pi }^{+}{\pi }^{-}$, $K^{+}{\bar{K}}^0{\pi }^{-}$, and $K^{-}{K}^0{\pi }^{+}$ decay channels from threshold up to a center-of-mass energy of 2.8 GeV. The mass, width, and an amplitude analysis of the $\eta {\pi }^{+}{\pi }^{-}$ final-state Dalitz distribution are consistent with the axial-vector $J^P=1^{+}$ $f_1(1285)$ identity, rather than the pseudoscalar $0^{-}$ $\eta (1295)$. The production mechanism is more consistent with $s$-channel decay of a high-mass $N^{\ast }$ state, and not with $t$-channel meson exchange. Decays to $\eta \pi \pi$ go dominantly via the intermediate $a_0^{\pm }(980){\pi }^{\mp }$ states, with the branching ratio $\Gamma (a_0\pi \text{ (no}\bar{K}K\text{)})/\Gamma (\eta \pi \pi \text{(all)})=0.74\pm 0.09$. The branching ratios $\Gamma (K\bar{K}\pi )/\Gamma (\eta \pi \pi )=0.216\pm 0.033$ and $\Gamma (\gamma {\rho }^0)/\Gamma (\eta \pi \pi )=0.047\pm 0.018$ were also obtained. The first is in agreement with previous data for the $f_1(1285)$, while the latter is lower than the world average.

26 pages, 16 figures, Reference added, submitted to Physical Review C

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Cited by in corpus (30)

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• QCD Sum Rule for Open Strange Meson $K_1^{\pm }$ in Nuclear Matter
• Analysis of recent CLAS data on $f_1(1285)$ photoproduction
• A novel probe of chiral restoration in nuclear medium
• The anomalous decay $f_1(1285)\to \rho \gamma$ and related processes
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• Central Production of $\eta$ via Double Pomeron Exchange and Double Reggeon Exchange in the Sakai-Sugimoto Model
• Theoretical description of the $\mathbf{J}/\mathbf{\psi }\to \mathbf{\eta }({\mathbf{\eta }}^{\prime }){\mathbf{h}}_1(1380)$, $\mathbf{J}/\mathbf{\psi }\to \mathbf{\eta }({\mathbf{\eta }}^{\prime }){\mathbf{h}}_1(1170)$ and $\mathbf{J}/\mathbf{\psi }\to {\mathbf{\pi }}^0{\mathbf{b}}_1(1235{)}^0$ reactions
• Radiative decays of $f_1(1285)$ as the $K^{\ast }\bar{K}$ molecular state
• Study on the reaction of $\gamma p\to f_1(1285)p$ in Regge-effective Lagrangian approach
• Investigation of pion-induced $f_1(1285)$ production off a nucleon target within an interpolating Reggeized approach
• Consistent analysis of $f_1(1285)$ meson form factors
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• Exclusive $f_1(1285)$ meson production for energy ranges available at the GSI-FAIR with HADES and PANDA
• Fate of the Landau-Yang theorem for twisted photons
• Measurement of f${}_1$(1285) production in pp collisions at $\sqrt{\text{s}}$ = 13 TeV
• Theory on Hadrons in Nuclear Medium
• Configurational information measure of mesonic states in 4-flavor AdS/QCD
• High Energy Behaviour of Light Meson Photoproduction
• Anomalous decay $f_1(1285)\to {\pi }^{+}{\pi }^{-}\gamma$ in the Nambu - Jona-Lasinio model
• Investigating the glue content of $f_1(1285)$
• Pseudoscalar and Scalar Meson Photoproduction Interpreted by Regge Phenomenology
• The production of the $f_1(1285)\gamma$ and $a_1(1260)\gamma$ in colliding $e^{+}{e}^{-}$-beams in threshold domain
• Photoproductions of $f_1(1285)$ and ${\eta }^{\prime }(958)$ from the analysis of CLAS data with the Primakoff effect at high energies
• Analysis of the data for $\gamma p\to f_1(1285)p$ photoproduction
• $K_1^{\pm }$ mesons moving in nuclear matter
• Charged pions asymmetry from the decay of light neutral axial mesons due to interference