[clas12_rgk] 2 pion cuts

[Nikolay Markov]

Hi Evgeny,
I do not ask strictly for 2 hadrons, I ask for two hadrons plus anything on top.
May be changing it will change the skim size.
We can discuss this skimming business later today during the meeting.
Nick.
________________________________
From: burkert <burkert at jlab.org>
Sent: Wednesday, June 17, 2020 1:13 PM
To: clas12_rgk at jlab.org <clas12_rgk at jlab.org>; Nikolay Markov <markov at jlab.org>
Subject: Re: [clas12_rgk] 2 pion cuts

Evgeny,

Is seems to me there are two typos in your selection (marked by arrow --->:)


On 6/17/20 12:19 PM, golovach at jlab.org wrote:
> 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
should that be: if pi+, pi- are present ......

> ----> 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

should that be: if  p, pi+, pi- are present,,


Volker


>
> 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
>
>
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