<div dir="ltr">A couple notes now that the momentum threshold for electron is back to 1.5 GeV<div>PCAL+ECAL > 300 MeV is the threshold for 1.5 GeV/c electrons. The corresponding value for PCAL is 170 MeV</div><div><br></div><div>In addition, 1.5 GeV/c momentum has a large polar angular range outside of acceptance for inbending torus full field (below 17 degrees or so depending on phi_sector)</div></div><br><div class="gmail_quote"><div dir="ltr">On Fri, Nov 9, 2018 at 3:28 PM Valery Kubarovsky <<a href="mailto:vpk@jlab.org" target="_blank">vpk@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-family:arial,helvetica,sans-serif;font-size:12pt;color:#000000"><div>Volker,</div><div>I agree with any trigger limits that will satisfy the spokespersons of the experiment.</div><div>I just want to know the parameters to start with. That's it. </div><div>Personally I prefer to go to as high to W as possible.</div><div>regards,</div><div>Valery</div><div> </div><div><br></div><hr id="m_4038828272562682927m_1536785434538998539zwchr"><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"><b>From: </b>"Volker Burkert" <<a href="mailto:burkert@jlab.org" target="_blank">burkert@jlab.org</a>><br><b>To: </b>"Valery Kubarovsky" <<a href="mailto:vpk@jlab.org" target="_blank">vpk@jlab.org</a>><br><b>Cc: </b>"Viktor Mokeev" <<a href="mailto:mokeev@jlab.org" target="_blank">mokeev@jlab.org</a>>, "clas12 rgk" <<a href="mailto:clas12_rgk@jlab.org" target="_blank">clas12_rgk@jlab.org</a>>, "annalisa dangelo" <<a href="mailto:annalisa.dangelo@roma2.infn.it" target="_blank">annalisa.dangelo@roma2.infn.it</a>><br><b>Sent: </b>Friday, November 9, 2018 3:13:00 PM<br><b>Subject: </b>Re: 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"><div class="m_4038828272562682927m_1536785434538998539moz-cite-prefix">Valery,<br> <br> The 2.5 GeV threshoild came out of the blue during that meeting, In the proposal we discuss surveys going to much higher mass. It would not be justified to lower the proposal requirements. <br> <br> Here is an excerpt of the abstract in the proposal for hybrid baryons:<br> <br> <b>"The experiment will use longitudinally polarized electron beams of 6.6 GeV and 8.8 GeV to</b><b><br> </b><b>cover the range of invariant mass W up to 3 GeV and Q2 from 0.05 GeV2 to 2 GeV2."</b><br> <br> Please lets not mess with the goals of the proposal.<br> <br> <br> Volker<br> <br> <br> <br> to On 11/9/18 2:05 PM, Valery Kubarovsky wrote:<br></div><blockquote><div style="font-family:arial,helvetica,sans-serif;font-size:12pt;color:#000000"><div>Hi All:</div><div><br></div><div>E' energy threshold suggested:</div><div><br></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></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></div><div> </div><div><br></div><div><br></div><hr id="m_4038828272562682927m_1536785434538998539zwchr"><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"><b>From: </b>"Volker Burkert" <a class="m_4038828272562682927m_1536785434538998539moz-txt-link-rfc2396E" href="mailto:burkert@jlab.org" target="_blank"><burkert@jlab.org></a><br> <b>To: </b>"Valery Kubarovsky" <a class="m_4038828272562682927m_1536785434538998539moz-txt-link-rfc2396E" href="mailto:vpk@jlab.org" target="_blank"><vpk@jlab.org></a>, "Viktor Mokeev" <a class="m_4038828272562682927m_1536785434538998539moz-txt-link-rfc2396E" href="mailto:mokeev@jlab.org" target="_blank"><mokeev@jlab.org></a><br> <b>Cc: </b>"clas12 rgk" <a class="m_4038828272562682927m_1536785434538998539moz-txt-link-rfc2396E" href="mailto:clas12_rgk@jlab.org" target="_blank"><clas12_rgk@jlab.org></a>, "annalisa dangelo" <a class="m_4038828272562682927m_1536785434538998539moz-txt-link-rfc2396E" href="mailto:annalisa.dangelo@roma2.infn.it" target="_blank"><annalisa.dangelo@roma2.infn.it></a><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><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"><div class="m_4038828272562682927m_1536785434538998539moz-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><div 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="m_4038828272562682927m_1536785434538998539zwchr"><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"><b>From: </b>"Viktor Mokeev" <a class="m_4038828272562682927m_1536785434538998539moz-txt-link-rfc2396E" href="mailto:mokeev@jlab.org" target="_blank"><mokeev@jlab.org></a><br> <b>To: </b>"clas12 rgk" <a class="m_4038828272562682927m_1536785434538998539moz-txt-link-rfc2396E" href="mailto:clas12_rgk@jlab.org" target="_blank"><clas12_rgk@jlab.org></a><br> <b>Cc: </b>"Volker Burkert" <a class="m_4038828272562682927m_1536785434538998539moz-txt-link-rfc2396E" href="mailto:burkert@jlab.org" target="_blank"><burkert@jlab.org></a>, "annalisa dangelo" <a class="m_4038828272562682927m_1536785434538998539moz-txt-link-rfc2396E" href="mailto:annalisa.dangelo@roma2.infn.it" target="_blank"><annalisa.dangelo@roma2.infn.it></a>, "Valery Kubarovsky" <a class="m_4038828272562682927m_1536785434538998539moz-txt-link-rfc2396E" href="mailto:vpk@jlab.org" target="_blank"><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"> 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></blockquote><p><br></p><br></blockquote></div></div></div>_______________________________________________<br>
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