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Radiative decay width measurements of neutral kaon excitations using the primakoff effect |
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| Authors: | Alavi-Harati A Alexopoulos T Arenton M Arisaka K Averitte S Barbosa R F Barker A R Barrio M Bellantoni L Bellavance A Belz J Bergman D R Blucher E Bock G J Bown C Bright S Cheu E Childress S Coleman R Corcoran M D Corti G Cox B Cunha A Erwin A R Ford R Glazov A Golossanov A Graham G Graham J Halkiadakis E Hamm J Hanagaki K Hidaka S Hsiung Y B Jejer V Jensen D A Kessler R Kobrak H G E LaDue J Lath A Ledovskoy A McBride P L Medvigy D Mikelsons P Monnier E Nakaya T Nelson K S Nguyen H O'Dell V Pordes R Prasad V Qi X R Quinn B Ramberg E J Ray R E Roodman A Schnetzer S Senyo K Shanahan P |
| Affiliation: | University of Wisconsin, Madison 53706, USA. |
| Abstract: | 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. |
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