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Getting rid of EVU (and only EVD left with EHI/EHO), there is only one peak.

For overlapped regions, we have two RP’s (eg. EVU & EHI or EVU & EHO) and we therefore have 4 equations to solve for 4 unknowns, including the vertices (x 0 ,y 0 ). [run: 10181085]. Getting rid of EVU (and only EVD left with EHI/EHO), there is only one peak.

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Getting rid of EVU (and only EVD left with EHI/EHO), there is only one peak.

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  1. For overlapped regions, we have two RP’s (eg. EVU & EHI or EVU & EHO) and we therefore have 4 equations to solve for 4 unknowns, including the vertices (x0,y0). [run: 10181085] • Getting rid of EVU (and only EVD left with EHI/EHO), there is only one peak. • And I roughly know from the collinearity plot that we need some +ve additions to make the large alignment (of EVU-WVD) smaller.

  2. By trials or errors (or called scanning) with different values, adding +1.25 mm would merge 2 peaks into 1. • vertices of x from DST for the same run • The only “imperfection” is that the average vertex positions found above is not exactly what the average vertex positions from the DST found by other STAR detectors.

  3. Trigger efficiencies (like last week): • in each EVU-WVD event and in the overlapped regions, I check whether whether EHI/WHI or EHO/WHO is fired in the respective overlapped region. • Note that the (online) trigger conditions are like : • EHX1/2: 100  TAC  1700 and ADC  5 and • EHX = EHX1 or EHX2 • where X = I or O • Inefficiencies: • EHI:  (2.86  0.08)% WHI:  (3.60  0.088)% EHO: (3.79  0.08)% WHO: (0.33  0.028)%

  4. ADC’s for EVU-WVD in the overlapped (EVU-EHI and EVU-EHO) region run 10183028 :

  5. TAC’s for EVU-WVD in the overlapped (EVU-EHI and EVU-EHO) region run 10183028 :

  6. Where does the asymmetries come from ? Eg. for –t > 0.0295 (with -1.4  -0.4). y (m) x (m)

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