[Clas12_verystrange] [EXTERNAL] Electron energy correction

[Geraint Clash]

Hello all,

I carried out a study on the difference between the energy of the electron
when you treat it as missing and the measured electron using skim3 data
from this path: /volatile/clas12/users/clas12/rich/dst/recon/005038/. For
this, the exclusive reaction ep->e’p pi+pi- was selected, with three-sigma
cuts around missing mass squared of all products and the missing mass of
the proton.
The plot of the difference in energy ("missing" electron - detected
electron) against the electron measured energy is the attached file Del_E.
Y-projections were fitted with Gaussians and the means were fitted with a
fourth-order polynomial establishing the correction function (see attached).

The energy correction which should be added to the measured electron
energy, E, is: -0.0004x^4+0.0071x^3-0.0432x^2+0.1356x-0.0257.

Thanks,
Geraint Clash.
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