The quark structure of the f(2)(1270) meson has, for many years, been assumed to be a pure quark-antiquark (q (q) over bar) resonance with quantum numbers J(PC) = 2(++). Recently, it was proposed that the f(2)(1270) is a molecular state made from the attractive interaction of two rho mesons. Such a state would be expected to decay strongly to final states with charged pions due to the dominant decay rho -> pi(+)pi(-), whereas decay to two neutral pions would likely be suppressed. Here, we measure for the first time the reaction gamma p -> pi(0)pi(0)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, d sigma/dt, for f(2)(1270) photoproduction are extracted with good precision due to low backgrounds and are compared to theoretical calculations.
Carver, M., Celentano, A., Hicks, K., Marsicano, L., Mathieu, V., Pilloni, A., et al. (2021). Photoproduction of the f2 (1270) meson using the CLAS detector. PHYSICAL REVIEW LETTERS, 126(8) [10.1103/PhysRevLett.126.082002].
Photoproduction of the f2 (1270) meson using the CLAS detector
D'Angelo A.Membro del Collaboration Group
;Lanza L.;Rizzo A.Membro del Collaboration Group
;
2021-02-25
Abstract
The quark structure of the f(2)(1270) meson has, for many years, been assumed to be a pure quark-antiquark (q (q) over bar) resonance with quantum numbers J(PC) = 2(++). Recently, it was proposed that the f(2)(1270) is a molecular state made from the attractive interaction of two rho mesons. Such a state would be expected to decay strongly to final states with charged pions due to the dominant decay rho -> pi(+)pi(-), whereas decay to two neutral pions would likely be suppressed. Here, we measure for the first time the reaction gamma p -> pi(0)pi(0)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, d sigma/dt, for f(2)(1270) photoproduction are extracted with good precision due to low backgrounds and are compared to theoretical calculations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
