[clas12_rgk] Range of the scattered electron energies

[Valery Kubarovsky]

Hi All: 

E' energy threshold suggested: 

Victor 3.54 GeV - exact energy limit 
Volker 2.00 GeV - includes correction for the resonance's widths. 

I think that the 2 GeV correction is too much for the resonance's widths. 
I suggest to have more realistic estimations. If trigger rate will permit we can always lower the calorimeter energy cut. I don't think that it will be the case and we will decide any way what to do: make a stronger trigger cuts or go down with the beam current. Let us establish the trigger limits that is absolutely necessary. Later on we can adjust it. 
Regards, 
Valery 

> From: "Volker 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.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/clas12_rgk/attachments/20181109/2b058a22/attachment.html>