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<p class="MsoNormal">For the exclusivity selection it is much safer to use conditions total missing momentum to be 0 and total transverse momentum to be 0 rather than no other hadrons or anything else.
<o:p></o:p></p>
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<p class="MsoNormal">-Eugene<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> clas12_rgk <clas12_rgk-bounces@jlab.org> <b>On Behalf Of
</b>Viktor Mokeev<br>
<b>Sent:</b> Wednesday, June 17, 2020 14:24<br>
<b>To:</b> Francois-Xavier Girod-Gard <fxgirod@jlab.org>; Volker Burkert <burkert@jlab.org><br>
<b>Cc:</b> clas12_rgk@jlab.org<br>
<b>Subject:</b> Re: [clas12_rgk] 2 pion cuts<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">FX,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> In my opinion, the answer is no. The question is what size will be acceptable.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> Best Regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> Victor <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> clas12_rgk <<a href="mailto:clas12_rgk-bounces@jlab.org">clas12_rgk-bounces@jlab.org</a>> on behalf of Francois-Xavier Girod <<a href="mailto:fxgirod@jlab.org">fxgirod@jlab.org</a>><br>
<b>Sent:</b> Wednesday, June 17, 2020 1:49 PM<br>
<b>To:</b> Volker Burkert <<a href="mailto:burkert@jlab.org">burkert@jlab.org</a>><br>
<b>Cc:</b> <a href="mailto:clas12_rgk@jlab.org">clas12_rgk@jlab.org</a> <<a href="mailto:clas12_rgk@jlab.org">clas12_rgk@jlab.org</a>><br>
<b>Subject:</b> Re: [clas12_rgk] 2 pion cuts</span> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Dear all<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">From what I had understood the goal of the double pion analysis, ultimately, is to measure a cross section. Are we sure that a blanket veto on “no other hadron” is safe for cross sections?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best regards<o:p></o:p></p>
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<p class="MsoNormal">FX<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Jun 17, 2020 at 7:41 PM burkert <<a href="mailto:burkert@jlab.org">burkert@jlab.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Evgeny,<br>
Maybe I don't understand the nomenclature. But it appears that<br>
<br>
- In first cut you ask for presence of (2pi+ and no other hadrons), and <br>
in the MM2 (e, pi+, pi-), where do you get the pi- from?<br>
<br>
- in second cut you ask for presence of (p, 2pi+ and no other hadrons) <br>
and in MM2 you ask for presence of p,pi+,pi-). Again, where is the pi- <br>
from?<br>
<br>
Volker<br>
<br>
<br>
<br>
On 6/17/20 1:30 PM, <a href="mailto:golovach@jlab.org" target="_blank">golovach@jlab.org</a> wrote:<br>
> Dear Volker,<br>
><br>
> I do no see the typos<br>
> the first arrow ---> pi+, pi+ are present<br>
> the second arrow ----> p, pi+, pi+ are present<br>
> That is correct.<br>
> Evgeny<br>
><br>
><br>
>> Evgeny,<br>
>><br>
>> Is seems to me there are two typos in your selection (marked by arrow<br>
>> --->:)<br>
>><br>
>><br>
>> On 6/17/20 12:19 PM, <a href="mailto:golovach@jlab.org" target="_blank">golovach@jlab.org</a> wrote:<br>
>>> Hi Nick,<br>
>>><br>
>>> MM2 cuts for the 2 pion events are:<br>
>>> The presence of extra electrons and neutrals are not taken into account.<br>
>>> if p, pi+ are present and there are no other hadrons,<br>
>>> then MM2(e_prot_pip)>-0.35 && MM2_e_prot_pip<0.35<br>
>>> if p, pi- are present and there are no other hadrons,<br>
>>> then MM2(e_prot_pim)>-0.35 && MM2_e_prot_pim<0.35<br>
>>> ---> if pi+, pi+ are present and there are no other hadrons,<br>
>>> then MM2(e_pip_pim)> 0.62 && MM2_e_pip_pim<1.18<br>
>> should that be: if pi+, pi- are present ......<br>
>><br>
>>> ----> if p, pi+, pi+ are present and there are no other hadrons,<br>
>>> then MM2(e_prot_pip_pim)> -0.018 && MM2_e_prot_pip_pim<0.018<br>
>> should that be: if p, pi+, pi- are present,,<br>
>><br>
>><br>
>> Volker<br>
>><br>
>><br>
>>> Could you, produce train15 (say for the run 5898) for the test?<br>
>>><br>
>>><br>
>>> I do not understand one thing.<br>
>>> Annalisa has shown that the train eTwoChargedH takes 17% of the total<br>
>>> size.<br>
>>><br>
>>> I have analyzed a subset of the dst files in<br>
>>> /lustre19/expphy/volatile/clas12/rg-k/production/pass0/v1_1.1.12/dst/recon/005898/<br>
>>> and I see much larger reduction of the number of the 2 pion events.<br>
>>> If I select 2 pion events I have only ~2% of the total number of events.<br>
>>> If I select 2 pion events and apply MM2 cuts I have ~0.88% of the total<br>
>>> number of events.<br>
>>> May be the MM2 cuts are not necessary?<br>
>>><br>
>>> My selection of the 2 pion events as I mentioned is:<br>
>>> The presence of extra electrons and neutrals are not taken into<br>
>>> account.<br>
>>> p, pi+ are present and there are no other hadrons<br>
>>> p, pi- are present and there are no other hadrons<br>
>>> pi+, pi+ are present and there are no other hadrons<br>
>>> p, pi+, pi+ are present and there are no other hadrons<br>
>>><br>
>>> Evgeny<br>
>>><br>
>>><br>
>>> _______________________________________________<br>
>>> clas12_rgk mailing list<br>
>>> <a href="mailto:clas12_rgk@jlab.org" target="_blank">clas12_rgk@jlab.org</a><br>
>>> <a href="https://mailman.jlab.org/mailman/listinfo/clas12_rgk" target="_blank">
https://mailman.jlab.org/mailman/listinfo/clas12_rgk</a><br>
>><br>
>> _______________________________________________<br>
>> clas12_rgk mailing list<br>
>> <a href="mailto:clas12_rgk@jlab.org" target="_blank">clas12_rgk@jlab.org</a><br>
>> <a href="https://mailman.jlab.org/mailman/listinfo/clas12_rgk" target="_blank">
https://mailman.jlab.org/mailman/listinfo/clas12_rgk</a><br>
>><br>
><br>
<br>
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