Observation of the destructive interference in the radiative kaon decay K- --> mu-nugamma

Details Observation of the destructive interference in the radiative kaon decay K- --> mu-nugamma Observation of the destructive interference in the radiative kaon decay K- --> mu-nugamma

2010-01-03

arxiv.org/abs/1001.0374v1

Physics

High Energy Physics

High Energy Physics - Experiment

14 pages, 6 EPS figures, to be submitted to Phys.Lett.B

Scientific paper

Using data collected with the ISTRA+ spectrometer at U70 proton synchrotron of IHEP, we report the first measurement of the destructive interference in the radiative kaon cecay K- -->mu-nugamma. We find the difference of the vector and axial form factors Fv-Fa=0.126+/-0.027+/-0.043. The measured value is two standard deviations above the O(p**4) ChPT prediction equal to 0.055. Inclusion of exotic tensor interaction gives Fv-Fa=0.144+/-0.044+/-0.035 and Ft=-0.0079+/-0.0113+/-0.0073, i.e. -0.03

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