[clas12_rgk] 2 pion cuts

[golovach at jlab.org]

Hi Nick,

MM2 cuts for the 2 pion events are:
The presence of extra electrons and neutrals are not taken into account.
if p, pi+   are present and there are no other hadrons,
  then  MM2(e_prot_pip)>-0.35 && MM2_e_prot_pip<0.35
if p, pi-   are present and there are no other hadrons,
  then  MM2(e_prot_pim)>-0.35 && MM2_e_prot_pim<0.35
if pi+, pi+ are present and there are no other hadrons,
  then  MM2(e_pip_pim)> 0.62 && MM2_e_pip_pim<1.18
if p, pi+, pi+ are present and there are no other hadrons,
  then  MM2(e_prot_pip_pim)> -0.018 && MM2_e_prot_pip_pim<0.018

Could you, produce train15 (say for the run 5898) for the test?


I do not understand one thing.
Annalisa has shown that the train eTwoChargedH takes 17% of the total size.

I have analyzed a subset of the dst files in
/lustre19/expphy/volatile/clas12/rg-k/production/pass0/v1_1.1.12/dst/recon/005898/
and I see much larger reduction of the number of the 2 pion events.
If I select 2 pion events I have only ~2% of the total number of events.
If I select 2 pion events and apply MM2 cuts I have ~0.88% of the total
number of events.
May be the MM2 cuts are not necessary?

My selection of the 2 pion events as I mentioned is:
  The presence of extra electrons and neutrals are not taken into account.
  p, pi+   are present and there are no other hadrons
  p, pi-   are present and there are no other hadrons
  pi+, pi+ are present and there are no other hadrons
  p, pi+, pi+ are present and there are no other hadrons

  Evgeny