[Sane-analysis] Found source of data plotted on O'Connell's inclusive pions report

[O. A. Rondon]

Garth kindly clarified that he's not author G. Huber on the DESY paper
on pion electroproduction on C.

Unfortunately, given the age of the paper (the online version looks
scanned), it's very unlikely that a tabulated version may be still
around, just like I learned is the case for the Yerevan data (no tables).

So I digitized Fig. 5 of the reference, and compared the result with the
digitized points from O'Connell's report. The agreement is quite good
(which could also mean the digitizing biases are similar...), see the
plots below, available on my wiki inclusive pions page
https://userweb.jlab.org/~rondon/sane/analysis/pairs/incl-pi-desy.pdf

The scaling fit to the Yerevan data does apply quite well to the DESY
data, down to about pion PT ~ 200 MeV/c, where scaling probably no
longer works anyway. In any case, it's better than Wiser for C.

But everyone is welcome to improve things, for example, fitting the
C(e,pi-) data directly. There are lots of pi- data in the DESY paper, on
C, 2H, and protons (although we would need pi+ data too, to get pi0
fits).

Cheers,

Oscar



O. A. Rondon wrote:
> After searching a little harder, I found the data plotted by hand in
> O'Connell's report, Fig. 1
> https://userweb.jlab.org/~rondon/oconnell-highp_inclusive-pions.pdf
> 
> The original paper is
> "Production of Negative Pions from Hydrogen, Deuterium and Carbon by
> High-Energy Electrons", F.H. Heimlich, G. Huber et al., Nucl.Phys. A267
> (1976) 493
> 
> http://dx.doi.org/10.1016/0375-9474(76)90674-6
> 
> see fig. 5. I'm contacting Garth Huber about it, he may be one of the
> authors.
> 
> Cheers,
> 
> Oscar
> 
> 
> 
>