[Clas12_verystrange] Fwd: [Clas_offline] problem with fastmc

[Eugene Pasyuk]

FYI


----- Forwarded Message -----
From: "Mac Mestayer" <mestayer at jlab.org>
To: "clas offline" <clas_offline at jlab.org>
Sent: Friday, November 8, 2013 9:51:13 AM
Subject: [Clas_offline] problem with fastmc

Hello offliners;

Dan has discovered what seems to be a serious bug
in one particular version of fastmc.
For electroproduction of K+ Lambda, he
was getting missing mass resolutions too narrow by
a factor of two.  We think it's because the outgoing
electron's momentum was not being smeared.
I gave him a frozen, hard-wired version of
fastmc (only for the special case of K Lambda) which
he will investigate.

Dan and Kijun will look into this and try to figure out
which version of fastmc is correct and will communicate
this to people.

 			- Mac

"mestayer at jlab.org", (757)-269-7252
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