[Rivet] CDF run1 pT spectrum analysis

[Holger Schulz]

Dear Riveteers,

today I noticed that the CDF_1988.... analysis is sort of
broken. It's the one that has the Run I pT spectra in it.

For some reason, I get negative bin-contents throughout.
I guess the likely culprit is this line in finalize:

    scale(_hist_pt, crossSectionPerEvent()/millibarn);

Is this supposed to work? If there is no uick fix, do
you think it's ok to normalise to the ref-histo area
in this case?

Cheers,
Holger
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