<html><body><div style="font-family: arial,helvetica,sans-serif; font-size: 12pt; color: #000000"><div>Hi All:</div><div><br data-mce-bogus="1"></div><div>E' energy threshold suggested:</div><div><br data-mce-bogus="1"></div><div>Victor 3.54 GeV - exact energy limit </div><div>Volker 2.00 GeV - includes correction for the resonance's widths.</div><div><br data-mce-bogus="1"></div><div>I think that the 2 GeV correction is too much for the resonance's widths.</div><div>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.</div><div> </div><div>Regards,</div><div>Valery</div><div><br data-mce-bogus="1"></div><div> </div><div><br data-mce-bogus="1"></div><div><br></div><hr id="zwchr" data-marker="__DIVIDER__"><div data-marker="__HEADERS__"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"Volker Burkert" <burkert@jlab.org><br><b>To: </b>"Valery Kubarovsky" <vpk@jlab.org>, "Viktor Mokeev" <mokeev@jlab.org><br><b>Cc: </b>"clas12 rgk" <clas12_rgk@jlab.org>, "annalisa dangelo" <annalisa.dangelo@roma2.infn.it><br><b>Sent: </b>Friday, November 9, 2018 11:51:55 AM<br><b>Subject: </b>Re: Range of the scattered electron energies<br></blockquote></div><div data-marker="__QUOTED_TEXT__"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><div class="moz-cite-prefix">I think Victor calculated a sharp threshold without considering the resonances have broad widths for hybrids. <br> <br> I suggest the following, i.e. W thresholds are above 3 GeV in either case. <br> <br> 7.5 GeV: E'min>2.0 GeV<br> 6.5 GeV: E'min>2.0 GeV<br> <br> For the upper E' I suggest to lower the numbers so that resonance width are taken into account.<br> 7.5GeV: E'max< 7.0 GeV <br> 6.5GeV: E'max < 6.0 GeV <br> <br> Thresholds may have to be adjusted for energy leakage. <br> <br> Volker<br> <br> <br> <br> On 11/9/18 11:16 AM, Valery Kubarovsky wrote:<br></div><blockquote cite="mid:1415632193.11796983.1541780200460.JavaMail.zimbra@jlab.org"><div style="font-family: arial,helvetica,sans-serif; font-size:
12pt; color: #000000" data-mce-style="font-family: arial,helvetica,sans-serif; font-size: 12pt; color: #000000;"><div>Hi All:</div><div><br></div><div>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.</div><div><br></div><div>Regards,</div><div>Valery</div><div><br></div><div><br></div><hr id="zwchr"><div><blockquote style="border-left:2px solid
#1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="border-left: 2px solid#1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"Viktor Mokeev" <a class="moz-txt-link-rfc2396E" href="mailto:mokeev@jlab.org" target="_blank" data-mce-href="mailto:mokeev@jlab.org"><mokeev@jlab.org></a><br> <b>To: </b>"clas12 rgk" <a class="moz-txt-link-rfc2396E" href="mailto:clas12_rgk@jlab.org" target="_blank" data-mce-href="mailto:clas12_rgk@jlab.org"><clas12_rgk@jlab.org></a><br> <b>Cc: </b>"Volker Burkert" <a class="moz-txt-link-rfc2396E" href="mailto:burkert@jlab.org" target="_blank" data-mce-href="mailto:burkert@jlab.org"><burkert@jlab.org></a>, "annalisa dangelo" <a class="moz-txt-link-rfc2396E" href="mailto:annalisa.dangelo@roma2.infn.it" target="_blank" data-mce-href="mailto:annalisa.dangelo@roma2.infn.it"><annalisa.dangelo@roma2.infn.it></a>, "Valery Kubarovsky" <a class="moz-txt-link-rfc2396E" href="mailto:vpk@jlab.org" target="_blank" data-mce-href="mailto:vpk@jlab.org"><vpk@jlab.org></a><br> <b>Sent: </b>Friday, November 9, 2018 10:22:06 AM<br> <b>Subject: </b>Range of the scattered electron energies<br></blockquote></div><div><blockquote style="border-left:2px solid
#1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="border-left: 2px solid#1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"> Dear Colleagues,<br> <br> 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.<br> <br> 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.<br> 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.<br> <br> The details of the evaluations are in the attached file.<br> <br> Best Regards,<br> Victor<br> <br> 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.<br></blockquote></div></div></blockquote><p><br></p><br></blockquote></div></div></body></html>