Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2003-11-05
Fizika B13:127-134,2004
Physics
High Energy Physics
High Energy Physics - Experiment
Talk presented at the 2nd International Conference on Nuclear and Particle Physics with CEBAF, held 26-31 May 2003 in Dubrovni
Scientific paper
We have used the PIBETA large acceptance detector for a precise measurement of the $\pi^+ \to e^+\nu\gamma$ radiative decay at rest, with broad phase space coverage. Using the CVC value for the pion vector form factor, $F_V = 0.0259(5)$, we have obtained a new value of the pion axial-vector form factor $\gamma = F_A/F_V = 0.429(14)$. However, significant deviations from the SM predictions are evident in our data. The discrepancy can be accounted for by introducing a pion tensor form factor of $F_T = -0.0016(3)$. The question of the true nature of the observed deviations remains open pending further theoretical and experimental study.
PIBETA collaboration for the
Pocanic Dinko
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