[G12] vertex distribution

[Eugene Pasyuk]

Mike, 

What is the theta_lab distribution for leptons and pions? Also what is the opening angle distribution in the lab for lepton pairs and for pion pairs? 

-Eugene 

----- Original Message -----

> From: "Michael C. Kunkel" <mkunkel at jlab.org>
> To: "Dennis Weygand" <weygand at jlab.org>
> Cc: g12 at jlab.org
> Sent: Monday, March 18, 2013 3:52:13 PM
> Subject: Re: [G12] vertex distribution

> Greetings,

> I got my hands on PPipPim data to plot the MVRT information.
> I have posted the plots of the r of MVRT and x vs. y of MVRT for the
> following topologies:

> Pion; Missing Mass Proton Pi+ Pi- -> 0 (exclusive)
> Effective Mass Pi+ Pi- ->Omega

> Lepton: Missing Mass Proton e+ e- < Pi0
> Missing Mass Proton e+ e- gamma -> 0 (exclusive)
> Effective Mass e+ e- gamma ->Pi0

> Plot can be found at
> https://clasweb.jlab.org/rungroups/g7/wiki/index.php/Reconstruction_study
> for March 18, 2013

> Before anyone cries "bug", let me assure everyone that the manner in
> which the MVRT data is collected for the pions is the same as for
> leptons, i.e. a clasEvent function.

> From what I deduce, it appears that either exclusive Pi0 production
> can happen outside of the target (cough cough), or for some reason
> when the particle is a lepton, we have resolution problems. Neither
> I can understand from looking at what creates the MVRT.

> Thoughts and help would be appreciated greatly.

> BR
> MK

> On 3/13/13 3:46 PM, Dennis Weygand wrote:

> > Does anyone have plots of vertex distributions (z, x vs y, r from
> > MVRT) for any topology?
> 
> > Dennis
> 

> > --
> 
> > Dennis Weygand
> 
> > weygand at jlab.org
> 
> > (757) 269-5926 (office)
> 
> > (757) 870-4844 (cell)
> 

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