[Rivet] ALEPH -log(xp)

[Hendrik Hoeth]

Hi,

Thus spake Holger Schulz (holger.schulz at physik.hu-berlin.de):

> But this is presumably not enough to explain
> the difference we see.

no, that's by far not enough.

I found that not just the ln(1/xp) differs in normalization, but also
the xp itself:

ln(1/xp): 19.82417
xp:       20.062625
<nchg>:   20.91

At least xp should be equal to the mean charged multiplicity, as by
definition it is between 0 and 1, and I don't believe that the region
above ln(1/xp)=5.4 makes up for a 5% effect -- especially since we would
see the same discrepancy in Monte Carlo. I don't see any obvious reason
for this in the paper either.

    Hendrik

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