[Bonuslist] [EXTERNAL] Re: Follow-up on dEdx studies

[mhattawy@odu.edu]

Dear all,
    Figure 11 in
https://userweb.jlab.org/~hattawy/bonus_analysis/10geV_analysis/gain_test_Helium.pdf,
shows a quantitative description of how frequent a hit got written more
than once. This multiplicity distribution is for the protons tracks, with
momenta between 70 and 120 MeV/c, in helium 4 data at 2.1 GeV. It looks
like this happens at a rate less than 1%.

I have repeated the procedures on the protons from D2 run 12922 (10 GeV
run). Check figure 11 in
https://userweb.jlab.org/~hattawy/bonus_analysis/10geV_analysis/gain_test_12922_unity.pdf.
This shows that about 4% of the protons had at least one hit written more
than once.

I have seen occasional hits written more than twice.

Please let me know what you think.

Regards,
Mohammad.

On Thu, Jan 27, 2022 at 8:57 AM mhattawy at odu.edu <mohammad.hattawy at gmail.com>
wrote:

> Dear all,
>      I have recooked run 12922 with gains of unity and item 5 below shows
> the dEdx dependance on vz.
>
>    1. pass1 data: dEdx analysis for the protons from the helium runs
>    (12416-12422) with the old gains
>    <https://userweb.jlab.org/~hattawy/bonus_analysis/10geV_analysis/gain_test_Helium_pass1.pdf>
>    2. dEdx analysis for the protons from the the same runs after setting
>    all the gain factors to unity
>    <https://userweb.jlab.org/~hattawy/bonus_analysis/10geV_analysis/gain_test_Helium_NoGains.pdf>
>    3. dEdx analysis for the protons from the same helium runs with the
>    recent extracted gains
>    <https://userweb.jlab.org/~hattawy/bonus_analysis/10geV_analysis/gain_test_Helium.pdf>
>    4. dEdx analysis on the protons from run 12922 (10.4 GeV on D2 target)
>    with the recent extracted gains
>    <https://userweb.jlab.org/~hattawy/bonus_analysis/10geV_analysis/gain_test_12922.pdf>
>    5. dEdx analysis on the protons from run 12922 (10.4 GeV on D2 target)
>    with the unity gains
>    <https://userweb.jlab.org/~hattawy/bonus_analysis/10geV_analysis/gain_test_12922_unity.pdf>
>
>
> Figure 3 in 5 shows that the raw ADCs does not show any vz dependence for
> dEdx. This explains why our previous extracted gains from the helium runs
> at 2.1 GeV have show over correction to dEdx for the protons in 12922 (10
> GeV D2).
>
> Mathieu, We are still waiting for your hits repetition histograms. If you
> are taken for other work, please let me know and I will work this out.
>
> Best regards,
> Mohammad Hattawy.
>


-- 
Best regards,
Mohammad Hattawy.
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