[Olympus] 2pi production.

[Michael Kohl]

Hi Stan,
thanks for the info.
Do you know which information was used to reconstruct the beam energy in 
the document? One needs to know at least two variables to reconstruct E.
For the VEPP-3 experiment there is angular info for the lepton and proton, 
and there is a calorimetric measurement of the lepton energy but probably 
not for the proton.

In OLYMPUS we should have better angular resolution, and we have momentum 
information for both the lepton and the proton.
It remains to be seen how much of the 2-pion yield would survive the 
kinematic cuts.

Can we get a hand on the 2-PION-MAID generator?

Best regards
   Michael



On Tue, 25 Feb 2014, Belostotski, Stanislav wrote:

> Dear Michael,
> In line of our yesterday discussion, find please in the attached file
> kinematics for one and two pion production thresholds. You are right,
> the 2pi border is not too close to the elastic peak, but our momentum
> resolution ( I mean 12 deg.) is very poor so due to smearing it might be
> also some contribution from 2pi.
> I have also attached Gramolin's calculations. Note that this is the case
> of  essentially smaller primary energy.Somewhat surprising is that the
> radiation tail in Gramolin's picture looks much less pronounced as being
> presented by Brian. I understand of course, different kinematics,
> but...I wonder if our pion production generator was cross checked by
> comparing with elrctro/photo pion production data.
> With best regards StanB
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