[clas12_rgk] Range of the scattered electron energies

[burkert]

Radiative tail is visible starting at W=2.8 GeV, see below, from the 6.4 
GeV data from spring run,
but not terrible at W <3 GeV (20%?)
Volker




On 11/9/18 12:44 PM, Viktor Mokeev wrote:
> 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.
>>

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