[clas12_rgk] Isupov results: 2 gamma Invariant mass

[burkert]

Another eta decay of interest might be eta-> 3pi0 (32.7%). Here the 
2gamma's from each pi0 would likely be within a single sector. So, one 
could just scan for 2gamma events in 3 different sectors to limit the 
combinatorics.
Volker


On 7/7/19 2:50 PM, Francois-Xavier Girod wrote:
> 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 
> <mailto: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
>     <mailto: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
>         <mailto:clas12_rgk-bounces at jlab.org>> on behalf of burkert
>         <burkert at jlab.org <mailto:burkert at jlab.org>>
>         *Sent:* Sunday, July 7, 2019 2:02:12 PM
>         *To:* clas12_rgk at jlab.org <mailto: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>
>>         <mailto: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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