Radiative widths of neutral kaon excitations
We observe 147 events of the axial vector pairK1(1270)–K1(1400) produced in the Coulomb field of a Pb target and measure the radiative widths Γ(K1(1400)→K0 + γ) = 280.8 ±23.2(stat.) ±40.4(syst.) keV and Γ(K1(1270) →K0 + γ) = 73.2 ±6.1(stat.) ±28.3(syst.) keV. These first measurements are lower than the quark-model predictions. We also place upper limits on the radiative widths forK*(1410) andK2* (1430) and find that the latter is very small in accord withSU(3)invariance in the naive quark model.
Volume 94, 2020
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