<div dir="ltr"><div dir="ltr">Hey Dave, <div><br></div><div>Here's the code that gives you phi  (\in (0, 360) degrees) in the standard convention</div><div>for given </div><div><ul><li>beam (P_beam), </li><li>scattered electron (P_e), </li><li>recoiled target (P_rec)</li></ul>4 momenta.</div><div><br></div></div><blockquote style="margin:0 0 0 40px;border:none;padding:0px"><div><div><div>double getPhi( TLorentzVector P_beam, TLorentzVector P_e, TLorentzVector P_rec ){</div></div></div><div><div><div><br></div></div></div><div><div><div>      TLorentzVector P_q  = P_beam - P_e;  // The virtual photon 4-momentum</div></div></div><div><div><div><br></div></div></div><div><div><div>      TVector3 LeptonicPlane  = (P_beam.Vect()).Cross(P_e.Vect());</div></div></div><div><div><div>      TVector3 HadronicPlane = (P_rec.Vect()    ).Cross(P_q.Vect());</div></div></div><div><div><div><br></div></div></div><div><div><div>      Double_t phi = LeptonicPlane.Angle(HadronicPlane)* TMath::RadToDeg();</div></div></div><div><div><div>    </div></div></div><div><div><div>      if(LeptonicPlane.Dot(P_targ.Vect())>0.)  phi = 360.0 - phi;</div></div></div><div><div>      return phi;</div></div><div><div>}</div></div></blockquote><div dir="ltr"><div><br></div><div>Thanks,</div><div>Frank</div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Apr 11, 2019 at 6:18 AM Nathan Baltzell <<a href="mailto:baltzell@jlab.org">baltzell@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">



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<div>Hello All,</div>
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<div>Let's have our biweekly eg6 meeting today, at 1:30 in B101.  Here's the links:</div>
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<a href="https://clasweb.jlab.org/rungroups/lowq/wiki/index.php/Meeting_on_April_11,_2019_@_1:30PM" target="_blank">https://clasweb.jlab.org/rungroups/lowq/wiki/index.php/Meeting_on_April_11,_2019_@_1:30PM</a>
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<div><a href="https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbluejeans.com%2F151158041&data=02%7C01%7Ceg6_analysis%40jlab.org%7Cc6781db7640f482d113d08d6bea6366d%7Cb4d7ee1f4fb34f0690372b5b522042ab%7C1%7C0%7C636906018421437182&sdata=qNPnZC7Iqenixv3yaBmM1pJf%2FO5Cc6fioPtzcgN6O9w%3D&reserved=0" originalSrc="https://bluejeans.com/151158041" shash="QDgCAqhXhQrWPbRAru4ToO0Wcco8pdEK5ABIVADC+DrYXncr9ltfwOZyZFf8SnLY2/v5xJko86mlZmTops4RtRgOomY9k2AkY9AEYw5PKuR6XE8WLwcoOYADIB3p9UntdPkD4QWVCivKSqJtFa3e+DH+KqUFxSMohVXa3tAaP3s=" target="_blank">https://bluejeans.com/151158041</a></div>
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</div>
<div>-Nathan</div>
</div>

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