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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}](img1.gif) |
(1) |
where the factor
accounts for the flux of
virtual (anti-)quarks
in the
-background entering the
-induced
-subprocess from the photon
side [1,2],
![$\displaystyle P_{q^\prime}^{{ (I)}} = \frac{3}{16\,\pi^3}\,\frac{x_{\rm Bj}}{x^...
...}
-\frac{1}{x^{\prime}}-\frac{Q^{\prime 2}}{S x_{\rm Bj}y_{\rm Bj}}\right)
\, .$](img6.gif) |
|
|
(2) |
A. Ringwald
and F. Schrempp
1999-08-21