Phys. Rev. Lett. 89, 072001 (2002) [5 pages]Radiative Decay Width Measurements of Neutral Kaon Excitations Using the Primakoff Effect |
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Received 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/abstract/PRL/v89/e072001
DOI: 10.1103/PhysRevLett.89.072001
PACS: 12.38.Qk, 13.20.Eb
* Permanent address: University of São Paulo, São Paulo, Brazil.
† Permanent address: C.P.P. Marseille/C.N.R.S., France.
‡ To whom correspondence should be addressed. Electronic address: somalwar@physics.rutgers.edu
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