Phys. Rev. Lett. 89, 072001 (2002) [5 pages]Radiative Decay Width Measurements of Neutral Kaon Excitations Using the Primakoff EffectReceived 10 October 2001; published 26 July 2002 We use KL’s in the 100–200 GeV energy range to produce 147 candidate events of the axial vector pair K1(1270)-K1(1400) in the nuclear Coulomb field of a Pb target and determine 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 appear to be lower than the quark-model predictions. We also place upper limits on the radiative widths for K*(1410) and K2*(1430) and find that the latter is vanishingly small in accord with SU(3) invariance in the naive quark model. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.072001
DOI:
10.1103/PhysRevLett.89.072001
PACS:
12.38.Qk, 13.20.Eb
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