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SUBROUTINE QISPLT(WEIGHT) - Weight for photon splitting into quark-antiquark pair




This subroutine calculates the weight (WEIGHT)

\begin{displaymath}
W_{q^\prime} = \frac{1}{x^\prime z}\, P_{q^\prime}^{{ (I)}},
\end{displaymath} (1)

where the factor $P_{q^\prime}^{{ (I)}}$ accounts for the flux of virtual (anti-)quarks $q^\prime$ in the $I$-background entering the $I$-induced $q^\prime p$-subprocess from the photon side [1,2],
$\displaystyle P_{q^\prime}^{{ (I)}} = \frac{3}{16\,\pi^3}\,\frac{x_{\rm Bj}}{x^...
...}
-\frac{1}{x^{\prime}}-\frac{Q^{\prime 2}}{S x_{\rm Bj}y_{\rm Bj}}\right)
\, .$     (2)





A. Ringwald and F. Schrempp

1999-08-21