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Experimental study of direct photon emission in K/it− → π−π0γ decay using ISTRA+ detector |
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| Authors: | V A Uvarov S A Akimenko V N Bolotov G I Britvich K V Datsko V A Duk A P Filin A V Inyakin V A Khmelnikov A S Konstantinov V F Konstantinov I Ya Korolkov S V Laptev V M Leontiev V P Novikov V F Obraztsov V A Polyakov A Yu Polyarush V I Romanovsky V M Ronjin V I Shelikhov N E Smirnov O G Tchikilev O P Yushchenko |
| Institution: | (1) Institute for High Energy Physics, Protvino, Moscow oblast, 142284, Russia;(2) Institute for Nuclear Research, Russian Academy of Sciences, pr. Shestidesyatiletiya Oktyabrya 7a, Moscow, 117312, Russia |
| Abstract: | The branching ratio in the charged-pion-kinetic-energy region of 55 to 90 MeV for the direct photon emission in the K − → π−π0γ decay has been measured using in-flight decays detected with the ISTRA+ setup operating in the 25-GeV/c negative secondary beam of the U-70 PS. The value Br(DE)=0.37±0.39(stat.)±0.10(syst.)]×10−5 obtained from the analysis of 930 completely reconstructed events is consistent with the average value of two stopped-kaon experiments, but it differs by 2.5 standard deviations from the average value of three in-flight-kaon experiments. The result is also compared with recent theoretical predictions. The text was submitted by the authors in English. |
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