Make New Entry, Make Followup Entry
User name cshloka
Log entry time 09:14:01 on November11,2010
Entry number 339530
This entry is a followup to: 338012
keyword=Cerenkov efficiencyFollowing up on the cerenkov efficiency tests that Charles did, we took the plotted the cerenkov x and y projections with and without the time cuts and also plotted the ratio of these.
Figure 1 includes runs 7645-7655 taken before Charles decreased the Cerenkov thresholds and Fig 2 includes runs 8430-8445 taken after the thresholds decrease.
Definition of cuts:
TCut cGoodVDC = "L.tr.n==1&&abs(L.tr.x)<1.";
TCut cGoodAngles = "abs(L.tr.tg_th)<0.1&&abs(L.tr.tg_ph)<0.05";
TCut cTarget = "abs(L.tr.tg_y)<0.1";
TCut cCleanTrk = cGoodVDC&&cGoodAngles&&cTarget;
TCut ctime = "abs(D.CerInT3-2300)<500";
TCut certrx="L.cer.trx<1.5&&L.cer.trx>-1.5";
TCut certry="L.cer.try<0.4&&L.cer.try>-0.4"
In Both figures,
Plot 1: T->Draw("L.cer.asum_c",goodprl&&cCleanTrk&&certrx);
Plot 2: T->Draw("L.cer.trx>>xfull",goodprl&&cCleanTrk&&certrx);
T->Draw("L.cer.trx",goodprl&&cCleanTrk&&ctime&&certrx,"same");
Plot 3:hratio->Divide(hsome,hfull);
hratio->Draw();
Plot 4: T->Draw("L.cer.try>>yfull",goodprl&&cCleanTrk&&certry);
T->Draw("L.cer.try",goodprl&&cCleanTrk&&ctime&&certry,"same");
Plot 5: hratio->Divide(hsome,hfull);
hratio->Draw();
Plot6:
T->Draw("L.cer.trx:L.cer.try",goodprl&&cCleanTrk&&ctime&&certrx&&certry)
It is seen from comparing the two figures that before the threshold change, the ratio is not constant, besides being ~0.9. After the change, the ratio is almost 1 and also constant.
Charles decreasing the threshold did the trick.
FIGURE 1
FIGURE 2
