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Analysis<br />
Vector Meson Fraction<br />
Processes and Backgrounds<br />
Dihadron Est. VM Stats. Bkg. Frac.<br />
π + π 0 5497 68.5%<br />
π + π − 10846 85.4%<br />
π − π 0 2774 77.9%<br />
K + K − 700 31.9%<br />
◮ Some partial waves, such as |2, ±2〉, are a simple sum of vector meson plus<br />
non-vector meson contributions<br />
◮ Other partial waves involving interference, such as |1, 1〉, cannot be separated<br />
into a sum.<br />
◮ For the |2, ±2〉 partial waves, one can consider isolating the vector meson<br />
contribution using the estimated background fractions.<br />
◮ The fractions are determined by a Breit-Wigner plus linear background fit to<br />
the M h distribution.<br />
Gliske (HERMES / Michigan) SIDIS Vector Mesons at Hermes 11 April, 2011 39 / 66
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