[clas12_rgk] Range of the scattered electron energies

[Viktor Mokeev]

Dear All,

 I computed the sharp threshold for W_min=1.5 GeV and W_max=2.5 GeV. I agree with Volker numbers which take into accounbt the hybrid widths. The remaining question is whether rad. tail will allow us to analyze W>2.5 GeV?

 Best Regards,
              Victor

----- Original Message -----
From: "burkert" <burkert at jlab.org>
To: "Valery Kubarovsky" <vpk at jlab.org>, "Viktor Mokeev" <mokeev at jlab.org>
Cc: "clas12 rgk" <clas12_rgk at jlab.org>, "annalisa dangelo" <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>
>     *To: *"clas12 rgk" <clas12_rgk at jlab.org>
>     *Cc: *"Volker Burkert" <burkert at jlab.org>, "annalisa dangelo"
>     <annalisa.dangelo at roma2.infn.it>, "Valery Kubarovsky" <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.
>