[clas12_rgk] Isupov results: 2 gamma Invariant mass

[Francois-Xavier Girod]

I used simple angular cuts to enhance the eta fraction
angle gamma1 & gamma2 > 15 degrees
angle gamma1 & gamma2 > 30 degrees x ( 1 - E_{pi0} / 3 GeV )

In that case most photons come from different sectors

On Sun, Jul 7, 2019 at 8:41 PM Francois-Xavier Girod <fxgirod at jlab.org>
wrote:

> Dear Volker, Viktor
>
> I did not have a condition that photons are in the same sector in my
> analysis
>
> Best regards
> FX
>
> On Sun, Jul 7, 2019 at 8:15 PM Viktor Mokeev <mokeev at jlab.org> wrote:
>
>> Thank you Volker,
>>
>>
>>  Evgeny will prepare more detailed talk for the rg-k Meeting.
>>
>>
>> Best Regards,
>>
>>                                   Victor
>> ------------------------------
>> *From:* clas12_rgk <clas12_rgk-bounces at jlab.org> on behalf of burkert <
>> burkert at jlab.org>
>> *Sent:* Sunday, July 7, 2019 2:02:12 PM
>> *To:* clas12_rgk at jlab.org
>> *Subject:* Re: [clas12_rgk] Isupov results: 2 gamma Invariant mass
>>
>> Hi all,
>> You may be able to increase the eta yield by allowing the 2-gammas in
>> different sectors, otherwise the acceptance for eta's will be limited as
>> they have much larger minimum opening angles than pi0's.
>>
>> Volker
>>
>>   On 7/7/19 1:57 PM, Viktor Mokeev wrote:
>>
>> Dear Colleagues,
>>
>>
>> Evgeny Isupov repeated selection of gvp p--->pi^0p'---> gamma gamma p'
>> events from the same data set and with the same selection criteria as FX
>> did. His results for 2gamm inv masses are consistent with FX.
>>
>>
>>  Best Regards,
>>
>>                                       Victor
>>
>>
>> ------------------------------
>> *From:* Evgeny Isupov <e.l.isupov at gmail.com> <e.l.isupov at gmail.com>
>> *Sent:* Sunday, July 7, 2019 1:17 PM
>> *To:* Viktor Mokeev
>> *Subject:* 2 gamma Invariant mass
>>
>> Hi Victor Ivanovich,
>>
>> I used FX’s cuts and plotted 2 gamma invariant mass.
>> On the right you can see the same plot only in log scale,
>> we can clearly see the eta meson signal.
>>
>>
>> Evgeny Isupov
>>
>>
>>
>> This body part will be downloaded on demand.
>>
>>
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>
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