[clas12_rgk] Range of the scattered electron energies

[burkert]

Hi all,

  I think for the electron in FD the 300 MeV numbers for both PCAL+EC 
and for PCAL alone should be fine.Also the 10 MeV in ECAL should be fine.
FX's 425 MeV for PCAL+EC may be too tight  and may cut into good low x 
DVCS events.

For the  other hadron triggers the PCAL threshold of 15 MeV should be 
fine (mips will deposit 30 MeV in 15 layers of scintillators of 1cm 
thinkness).

Volker




  On 11/9/18 12:07 PM, Francois-Xavier Girod wrote:
> Dear Valery, all
>
> I can give the following numbers: for the selection of electron 
> momentum > 2 GeV/c the minimum energy deposited in PCAL+ECAL is 425 
> MeV at 2.5 sigma selection below mean value. The same value for PCAL 
> is 220 MeV
>
> I am not sure which other numbers you need for PCAL and ECAL 
> thresholds. Please let me know
>
> Best regards
> FX
>
>
> On Fri, Nov 9, 2018 at 11:56 AM Valery Kubarovsky <vpk at jlab.org 
> <mailto:vpk at jlab.org>> wrote:
>
>     Hi All:
>     Please estimate the desired thresholds for PCAL+ECAL energy for
>     all 4 thresholds.
>     Thanks,
>     Valery
>
>
>     ------------------------------------------------------------------------
>
>         *From: *"Volker Burkert" <burkert at jlab.org
>         <mailto:burkert at jlab.org>>
>         *To: *"Valery Kubarovsky" <vpk at jlab.org
>         <mailto:vpk at jlab.org>>, "Viktor Mokeev" <mokeev at jlab.org
>         <mailto:mokeev at jlab.org>>
>         *Cc: *"clas12 rgk" <clas12_rgk at jlab.org
>         <mailto:clas12_rgk at jlab.org>>, "annalisa dangelo"
>         <annalisa.dangelo at roma2.infn.it
>         <mailto:annalisa.dangelo at roma2.infn.it>>
>         *Sent: *Friday, November 9, 2018 11:51:55 AM
>         *Subject: *Re: Range of the scattered electron energies
>
>         I think Victor calculated a sharp threshold without
>         considering the resonances have broad widths for hybrids.
>
>         I suggest the following, i.e. W thresholds are above 3 GeV in
>         either case.
>
>         7.5 GeV: E'min>2.0 GeV
>         6.5 GeV: E'min>2.0 GeV
>
>         For the upper E' I suggest to lower the numbers so that
>         resonance width are taken into account.
>         7.5GeV: E'max< 7.0 GeV
>         6.5GeV: E'max < 6.0 GeV
>
>         Thresholds may have to be adjusted for energy leakage.
>
>         Volker
>
>
>
>         On 11/9/18 11:16 AM, Valery Kubarovsky wrote:
>
>             Hi All:
>
>             The scattered electron energy in the mail below differs by
>             a factor of 4 from the table that was presented today (see
>             attached screenshot). I believe that we have to define the
>             trigger parameters more precisely.
>
>             Regards,
>             Valery
>
>
>             ------------------------------------------------------------------------
>
>                 *From: *"Viktor Mokeev" <mokeev at jlab.org>
>                 <mailto:mokeev at jlab.org>
>                 *To: *"clas12 rgk" <clas12_rgk at jlab.org>
>                 <mailto:clas12_rgk at jlab.org>
>                 *Cc: *"Volker Burkert" <burkert at jlab.org>
>                 <mailto:burkert at jlab.org>, "annalisa dangelo"
>                 <annalisa.dangelo at roma2.infn.it>
>                 <mailto:annalisa.dangelo at roma2.infn.it>, "Valery
>                 Kubarovsky" <vpk at jlab.org> <mailto:vpk at jlab.org>
>                 *Sent: *Friday, November 9, 2018 10:22:06 AM
>                 *Subject: *Range of the scattered electron energies
>
>                  Dear Colleagues,
>
>                  I computed the range of the scattered electron
>                 energies for Q^2=0 and at the W interval from 1.5 GeV
>                 (W_min) to 2.5 GeV (W_max), which is the range of our
>                 physics interest.
>
>                 For the beam energy of 7.5 GeV the energy range of the
>                 scattered electrons should be from 4.64 GeV to 6.78 GeV.
>                 For the beam energy of 6.4 GeV the energy range of the
>                 scattered electrons should be from 3.54 GeV to 5.67 GeV.
>
>                 The details of the evaluations are in the attached file.
>
>                  Best Regards,
>                                    Victor
>
>                 PS For Q^2>0.1 GeV^2 the actual value of Q^2 becomes
>                 comparable with the \nu in the attached file and,
>                 therefore, should be taken into account. In comparison
>                 with the photon point, actual Q^2 value should
>                 increase \nu and decrease the range of the scattered
>                 electron energies.
>
>
>
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