Radiative decay width measurements of neutral kaon excitations using the primakoff effect.
We use K(L)'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 Gamma(K1(1400)-->K0+gamma)=280.8+/-23.2(stat)+/-40.4(syst) keV and Gamma(K1(1270)-->K0+gamma)=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 K(*)(2)(1430) and find that the latter is vanishingly small in accord with SU(3) invariance in the naive quark model.
Alavi-Harati
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University of Wisconsin, Madison 53706, USA.
Alexopoulos
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Arenton
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Arisaka
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Averitte
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Barbosa
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Barker
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Barrio
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Bellantoni
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Bellavance
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Belz
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Bergman
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Blucher
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Bock
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Bown
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Bright
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Cheu
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Childress
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Coleman
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Corcoran
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Corti
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Cox
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Cunha
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Erwin
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Ford
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Glazov
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Golossanov
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Graham
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Graham
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Halkiadakis
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Hamm
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Hanagaki
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Hidaka
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Hsiung
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YB
Jejer
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Jensen
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Kessler
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Kobrak
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LaDue
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Lath
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Ledovskoy
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McBride
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Medvigy
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Mikelsons
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Monnier
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Nakaya
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Nelson
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Nguyen
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O'Dell
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Pordes
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Prasad
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Qi
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Quinn
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Ramberg
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EJ
Ray
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Roodman
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Schnetzer
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Senyo
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Shanahan
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Shawhan
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Shields
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Slater
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Solomey
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Somalwar
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Stone
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Swallow
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Taegar
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Tesarek
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RJ
Thomson
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Toale
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Tripathi
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Tschirhart
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Turner
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Wah
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Wang
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White
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Whitmore
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Winstein
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Winston
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Yamanaka
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Zimmerman
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