Photoproduction of the F2(1270) Meson Using the CLAS Detector




The quark structure of the f2(1270) meson has, for many years, been assumed to be a pure quark-antiquark qq ̄ resonance with quantum numbers J PC = 2++. Recently, it was proposed that the f2(1270) is a molecular state made from the attractive interaction of two ρ mesons. Such a state would be expected to decay strongly to final states with charged pions due to the dominant decay ρ -> π+ π−, whereas decay to two neutral pions would likely be suppressed. Here, we measure for the first time the reaction gamma p -> π+ π− p, using the CEBAF Large Acceptance Spectrometer detector at Jefferson Lab for incident beam energies between 3.6 and 5.4 GeV. Differential cross sections, dσ/dt, for f2 (1270) photoproduction are extracted with good precision due to low backgrounds and are compared to theoretical calculations.

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DOI: https://doi.org/10.1103/PhysRevLett.126.082002.