Measurement of γγ ∗ → π 0 transition form factor at Belle

@inproceedings{Uehara2012MeasurementO,
  title={Measurement of γγ ∗ → π 0 transition form factor at Belle},
  author={Satoru Uehara},
  year={2012}
}
We report a measurement of the process γγ → π0 with a 759 fb−1 data sample recorded with the Belle detector at the KEKB asymmetric-energy e collider. The pion transition form factor, F(Q2), is measured for the kinematical region 4 GeV 2 < ∼ Q2 < ∼ 40 GeV2, where−Q2 is the invariant mass squared of a virtual photon. The measured values ofQ2|F(Q2)| agree well with the previous measurements below Q2 ≃ 9 GeV2 but do not exhibit the rapid growth in the higher Q2 region seen in another recent… CONTINUE READING
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