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cdcStrawHit vs. cdcTruthPoint

To: HallD Software Group <halld-offline@jlab.org>
Subject: cdcStrawHit vs. cdcTruthPoint
From: "Mark M. Ito" <marki@jlab.org>
Date: Tue, 09 Dec 2008 18:53:25 -0500
Reply-To: "Mark M. Ito" <marki@jlab.org>
Sender: owner-halld-offline@jlab.org
User-Agent: Thunderbird 2.0.0.18 (X11/20081119)

Folks,

In the attached hdgeant output for a single event, there are 25 
cdcStrawHit's but 35 cdcTruthPoint's. Why the difference?

When I look in the jana event, for the same event, I get 41 DMCTrackHits 
after screening for FDC and CDC hits as follows:

    if (mchit->system & (SYS_CDC | SYS_FDC) && mchit->primary == 1) {

Why so many? (This is a backward going track so there should be no FDC 
hits.) Do I need a binding lesson?

Thought I'd ask before digging into the code.

  -- Mark

<?xml version="1.0" encoding="UTF-8"?>
<HDDM class="s" version="1.0" xmlns="http://www.gluex.org/hddm">
  <physicsEvent eventNo="1" runNo="9999">
    <reaction type="0" weight="0">
      <vertex>
        <product decayVertex="0" id="1" mech="0" parentid="0" pdgtype="0" type="pi+">
          <momentum E="0" px="0.111806" py="1.54868" pz="-1.26059" />
        </product>
        <origin t="0" vx="0" vy="0" vz="65" />
      </vertex>
    </reaction>
    <hitView version="2.0">
      <centralDC>
        <cdcStraw ring="1" straw="11">
          <cdcStrawHit dE="1e-05" t="112.845" />
        </cdcStraw>
        <cdcStraw ring="2" straw="11">
          <cdcStrawHit dE="1e-05" t="32.4411" />
        </cdcStraw>
        <cdcStraw ring="3" straw="14">
          <cdcStrawHit dE="1e-05" t="7.87431" />
        </cdcStraw>
        <cdcStraw ring="5" straw="20">
          <cdcStrawHit dE="1e-05" t="117.903" />
        </cdcStraw>
        <cdcStraw ring="6" straw="19">
          <cdcStrawHit dE="1e-05" t="71.2639" />
        </cdcStraw>
        <cdcStraw ring="7" straw="23">
          <cdcStrawHit dE="1e-05" t="140.791" />
        </cdcStraw>
        <cdcStraw ring="8" straw="23">
          <cdcStrawHit dE="1e-05" t="34.2138" />
        </cdcStraw>
        <cdcStraw ring="10" straw="20">
          <cdcStrawHit dE="1e-05" t="12.2731" />
        </cdcStraw>
        <cdcStraw ring="11" straw="24">
          <cdcStrawHit dE="1e-05" t="93.1595" />
        </cdcStraw>
        <cdcStraw ring="12" straw="24">
          <cdcStrawHit dE="1e-05" t="68.6186" />
        </cdcStraw>
        <cdcStraw ring="13" straw="31">
          <cdcStrawHit dE="1e-05" t="130.77" />
        </cdcStraw>
        <cdcStraw ring="14" straw="31">
          <cdcStrawHit dE="1e-05" t="5.01924" />
        </cdcStraw>
        <cdcStraw ring="15" straw="34">
          <cdcStrawHit dE="1e-05" t="129.545" />
        </cdcStraw>
        <cdcStraw ring="16" straw="33">
          <cdcStrawHit dE="1e-05" t="37.4556" />
        </cdcStraw>
        <cdcStraw ring="17" straw="41">
          <cdcStrawHit dE="1e-05" t="103.822" />
        </cdcStraw>
        <cdcStraw ring="18" straw="40">
          <cdcStrawHit dE="1e-05" t="96.0385" />
        </cdcStraw>
        <cdcStraw ring="19" straw="44">
          <cdcStrawHit dE="1e-05" t="11.4012" />
        </cdcStraw>
        <cdcStraw ring="20" straw="44">
          <cdcStrawHit dE="1e-05" t="115.633" />
        </cdcStraw>
        <cdcStraw ring="21" straw="39">
          <cdcStrawHit dE="1e-05" t="49.1502" />
        </cdcStraw>
        <cdcStraw ring="22" straw="39">
          <cdcStrawHit dE="1e-05" t="112.981" />
        </cdcStraw>
        <cdcStraw ring="23" straw="42">
          <cdcStrawHit dE="1e-05" t="51.159" />
        </cdcStraw>
        <cdcStraw ring="24" straw="42">
          <cdcStrawHit dE="1e-05" t="107.422" />
        </cdcStraw>
        <cdcStraw ring="25" straw="50">
          <cdcStrawHit dE="1e-05" t="131.862" />
        </cdcStraw>
        <cdcStraw ring="26" straw="50">
          <cdcStrawHit dE="1e-05" t="3.00359" />
        </cdcStraw>
        <cdcStraw ring="28" straw="53">
          <cdcStrawHit dE="1e-05" t="20.9767" />
        </cdcStraw>
        <cdcTruthPoint dEdx="7.88577e-06" dradius="0.618058" phi="1.51762" primary="1" ptype="8" px="0.0563958" py="1.55168" pz="-1.2606" r="10.9323" t="0.47088" track="1" z="56.124" />
        <cdcTruthPoint dEdx="5.04585e-06" dradius="0.175502" phi="1.52005" primary="1" ptype="8" px="0.0505493" py="1.55188" pz="-1.2606" r="12.343" t="0.531654" track="1" z="54.9783" />
        <cdcTruthPoint dEdx="0.00861998" dradius="0.789137" phi="1.52126" primary="1" ptype="8" px="0.0426737" py="1.55211" pz="-1.2606" r="13.1126" t="0.564807" track="1" z="54.3534" />
        <cdcTruthPoint dEdx="4.92242e-06" dradius="0.0399853" phi="1.52287" primary="1" ptype="8" px="0.0420233" py="1.55213" pz="-1.2606" r="14.0282" t="0.60425" track="1" z="53.6099" />
        <cdcTruthPoint dEdx="8.36749e-06" dradius="0.644277" phi="1.52892" primary="1" ptype="8" px="0.0219309" py="1.55253" pz="-1.26062" r="17.6915" t="0.762084" track="1" z="50.6347" />
        <cdcTruthPoint dEdx="0.00419242" dradius="0.78902" phi="1.52967" primary="1" ptype="8" px="0.0173244" py="1.55258" pz="-1.26063" r="18.1561" t="0.782105" track="1" z="50.2573" />
        <cdcTruthPoint dEdx="5.5526e-06" dradius="0.387442" phi="1.53116" primary="1" ptype="8" px="0.0164309" py="1.55259" pz="-1.26063" r="19.0344" t="0.819951" track="1" z="49.5439" />
        <cdcTruthPoint dEdx="2.16592e-05" dradius="0.769377" phi="1.53432" primary="1" ptype="8" px="0.00428031" py="1.55266" pz="-1.26065" r="20.9889" t="0.904179" track="1" z="47.9561" />
        <cdcTruthPoint dEdx="4.984e-06" dradius="0.182834" phi="1.5369" primary="1" ptype="8" px="-0.000380558" py="1.55265" pz="-1.26066" r="22.5473" t="0.971346" track="1" z="46.6899" />
        <cdcTruthPoint dEdx="4.84469e-06" dradius="0.0613651" phi="1.5423" primary="1" ptype="8" px="-0.0163362" py="1.55253" pz="-1.2607" r="25.899" t="1.11582" track="1" z="43.9663" />
        <cdcTruthPoint dEdx="0" dradius="0.78924" phi="1.54355" primary="1" ptype="8" px="-0.0238832" py="1.55242" pz="-1.26073" r="26.6999" t="1.15035" track="1" z="43.3155" />
        <cdcTruthPoint dEdx="6.27968e-06" dradius="0.505768" phi="1.54547" primary="1" ptype="8" px="-0.0265657" py="1.55237" pz="-1.26074" r="27.8904" t="1.20168" track="1" z="42.3478" />
        <cdcTruthPoint dEdx="5.48568e-06" dradius="0.370456" phi="1.54772" primary="1" ptype="8" px="-0.032752" py="1.55223" pz="-1.26076" r="29.3108" t="1.26292" track="1" z="41.1933" />
        <cdcTruthPoint dEdx="0.00414006" dradius="0.788753" phi="1.54881" primary="1" ptype="8" px="-0.0392572" py="1.55205" pz="-1.26079" r="30.0185" t="1.29344" track="1" z="40.6179" />
        <cdcTruthPoint dEdx="1.13366e-05" dradius="0.711743" phi="1.55132" primary="1" ptype="8" px="-0.0449452" py="1.55188" pz="-1.26082" r="31.6077" t="1.36197" track="1" z="39.3259" />
        <cdcTruthPoint dEdx="4.91794e-06" dradius="0.0197726" phi="1.55359" primary="1" ptype="8" px="-0.049451" py="1.55172" pz="-1.26084" r="33.051" t="1.42422" track="1" z="38.1522" />
        <cdcTruthPoint dEdx="0" dradius="0.789521" phi="1.55479" primary="1" ptype="8" px="-0.0565037" py="1.55144" pz="-1.26088" r="33.8392" t="1.45822" track="1" z="37.5112" />
        <cdcTruthPoint dEdx="1.08988e-05" dradius="0.704265" phi="1.55617" primary="1" ptype="8" px="-0.0588783" py="1.55134" pz="-1.2609" r="34.7299" t="1.49664" track="1" z="36.7867" />
        <cdcTruthPoint dEdx="0.00541192" dradius="0.789212" phi="1.55671" primary="1" ptype="8" px="-0.0620185" py="1.5512" pz="-1.26092" r="35.0862" t="1.51201" track="1" z="36.4969" />
        <cdcTruthPoint dEdx="5.07443e-06" dradius="0.197452" phi="1.55828" primary="1" ptype="8" px="-0.0630738" py="1.55116" pz="-1.26093" r="36.0891" t="1.55528" track="1" z="35.6811" />
        <cdcTruthPoint dEdx="6.9638e-06" dradius="0.561947" phi="1.56163" primary="1" ptype="8" px="-0.0735387" py="1.55063" pz="-1.26101" r="38.2875" t="1.65014" track="1" z="33.8925" />
        <cdcTruthPoint dEdx="0.00483619" dradius="0.788994" phi="1.56246" primary="1" ptype="8" px="-0.0783072" py="1.55036" pz="-1.26105" r="38.8446" t="1.67418" track="1" z="33.4391" />
        <cdcTruthPoint dEdx="6.48162e-06" dradius="0.518822" phi="1.56363" primary="1" ptype="8" px="-0.0790236" py="1.55032" pz="-1.26106" r="39.6096" t="1.70719" track="1" z="32.8166" />
        <cdcTruthPoint dEdx="4.9047e-06" dradius="0.0528942" phi="1.56632" primary="1" ptype="8" px="-0.0857454" py="1.54991" pz="-1.26112" r="41.3915" t="1.7841" track="1" z="31.3662" />
        <cdcTruthPoint dEdx="8.02701e-06" dradius="0.625802" phi="1.56861" primary="1" ptype="8" px="-0.0934472" py="1.5494" pz="-1.26121" r="42.9349" t="1.85073" track="1" z="30.1097" />
        <cdcTruthPoint dEdx="0.00514102" dradius="0.78909" phi="1.56932" primary="1" ptype="8" px="-0.0974094" py="1.54911" pz="-1.26125" r="43.4181" t="1.87159" track="1" z="29.7163" />
        <cdcTruthPoint dEdx="5.12253e-06" dradius="0.259763" phi="1.57101" primary="1" ptype="8" px="-0.0989597" py="1.549" pz="-1.26127" r="44.5532" t="1.9206" track="1" z="28.792" />
        <cdcTruthPoint dEdx="7.65203e-06" dradius="0.61049" phi="1.57311" primary="1" ptype="8" px="-0.105766" py="1.54848" pz="-1.26136" r="45.9889" t="1.9826" track="1" z="27.6226" />
        <cdcTruthPoint dEdx="0.00441272" dradius="0.789001" phi="1.57384" primary="1" ptype="8" px="-0.109794" py="1.54815" pz="-1.26142" r="46.4958" t="2.00448" track="1" z="27.2098" />
        <cdcTruthPoint dEdx="5.14773e-06" dradius="0.270062" phi="1.57562" primary="1" ptype="8" px="-0.111616" py="1.54799" pz="-1.26145" r="47.7079" t="2.05684" track="1" z="26.2222" />
        <cdcTruthPoint dEdx="7.13775e-06" dradius="0.579162" phi="1.57772" primary="1" ptype="8" px="-0.11813" py="1.54742" pz="-1.26156" r="49.1668" t="2.11986" track="1" z="25.0334" />
        <cdcTruthPoint dEdx="0.00444619" dradius="0.788968" phi="1.57849" primary="1" ptype="8" px="-0.122298" py="1.54704" pz="-1.26163" r="49.7098" t="2.14332" track="1" z="24.5908" />
        <cdcTruthPoint dEdx="1.14346e-05" dradius="0.713161" phi="1.58026" primary="1" ptype="8" px="-0.125704" py="1.54671" pz="-1.26169" r="50.9441" t="2.19664" track="1" z="23.5848" />
        <cdcTruthPoint dEdx="4.91375e-06" dradius="0.00409222" phi="1.58234" primary="1" ptype="8" px="-0.129483" py="1.54634" pz="-1.26177" r="52.3998" t="2.25955" track="1" z="22.3979" />
        <cdcTruthPoint dEdx="4.95363e-06" dradius="0.102221" phi="1.5866" primary="1" ptype="8" px="-0.14063" py="1.54516" pz="-1.26202" r="55.4423" t="2.39106" track="1" z="19.9163" />
      </centralDC>
      <startCntr>
        <stcPaddle sector="6">
          <stcHit dE="0.000861469" t="1.81886" />
        </stcPaddle>
        <stcTruthPoint E="2.00486" dEdx="0.00359732" phi="1.51192" primary="1" ptype="8" px="0.0717155" py="1.55105" pz="-1.26059" r="7.60838" t="0.327701" track="1" z="58.8229" />
      </startCntr>
    </hitView>
  </physicsEvent>
</HDDM>

Follow-Ups:
- Re: cdcStrawHit vs. cdcTruthPoint
  - From: Beni Zihlmann <zihlmann@jlab.org>

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