[G12] Analysis of eta-pi photoproduction on the proton

[Andrea Celentano]

Dear all,
thanks for pointing out the bi-weekly meeting, I knew about it and for sure I’ll join the meeting to discuss about these and other issues. I thought that, given the CLAS meeting, the g12 meeting tomorrow was not present - I already have another meeting for tomorrow at that time.

I’ll join in two weeks from now.

Thanks again

Andrea

> On Nov 13, 2018, at 21:28, Michael C. Kunkel <mkunkel at jlab.org> wrote:
> 
> Greetings Andrea,
> 
> Tomorrow we will be having an non-regular meeting at out usual time.
> 1000 EST, 1600 CET.
> We will most likely have a short meeting, so please feel free to drop in and make it a long meeting.
> We, g12, can try to answer your questions then.
> 
> BR
> MK
> ----------------------------------------
> Michael C. Kunkel, PhD
> Forschungszentrum Jülich
> Nuclear Physics Institute and Juelich Center for Hadron Physics
> Experimental Hadron Structure (IKP-1)
> www.fz-juelich.de/ikp <http://www.fz-juelich.de/ikp>
> On 11/13/18 7:15 PM, Andrea Celentano wrote:
>> Dear g12 colleagues,
>> I write you to inform that, after a long time passed after my PhD thesis defense, that included a (preliminary) analysis of the gamma p -> p pi0 eta reaction from CLAS-g12 data, I decided to resume this analysis, starting from scratch and following closely the g12 procedures highlighted in the official g12 note. In the analysis, I am identifying pi0 and eta via the gamma-gamma decay.
>> This will be a low-priority project for me, but I’d like to come to an end of it - from what I saw in the thesis, this channel is very promising. Now, given the huge improvements in g12 analysis that the g12 group did, I think it will be simpler to come to an end of the analysis.I’d like to inform you - just to double check if there is anyone else looking at this reaction.
>> I have just started the analysis, and I am in the phase of selecting a good sample of exclusive p pi0 eta events. Meanwhile, I also started MC generation. At some point in the next future, I’d like to show some progresses in one of the bi-weekly meetings, in order to get your feedback from this.
>> 
>> I already have a simple question regarding MC. I followed closely the procedures highlighted in the g12 note to generate a phase-space MC sample (I followed the procedures highlighted for "proton, pi+, pi-", not those for "electrons and positrons"). In the real data, if I plot the invariant mass of a photon pair, I see a pi0 peak at around 135 MeV. However, If I do the same for MC events, I see a peak at about 116 MeV. I also plotted the reconstructed photon energy over the generated photon energy, and I see a peak at around 0.87. It looks the simulation of EC response in MC is not completely correct. (I confirm that the peak for generated events is at 135 MeV)
>> Is it because, using the EC, I should follow the procedure highlighted for "electrons and positrons" (involving run number 10 and requiring setenv CLAS_CALDB_RUNINDEX calib_user.RunIndexg12_mk?)
>> 
>> I also have a question regarding the TOF knockout procedure. In the note, the relevant method to use is: clas::g12::pass_g12_TOFKO(int sector, int scid, bool all_ko = 0), that requires to know the counter ID. For a charged particle, from the PART bank I can retrieve the entry in the TBID bank, and from this to the SCRC bank, that, however, contains information regarding TOF clusters. From this bank, I don't see a pointer to the SCR bank - containing individual paddles data.
>> 
>> Thanks,
>> 
>> Bests,
>> Andrea
>> 
>> 
>> 
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