Preliminary look at Rarm Q2 from run 4382

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User name mcnulty

Log entry time 14:57:27 on August 30, 2009

Entry number 287097

Followups:

287253 08/31/09 19:09 R. Michaels R-HRS Qsq
287254 08/31/09 19:13 mcnulty Q2 from EKRQ2 looks good

keyword=Preliminary look at Rarm Q2 from run 4382

Preliminary look at Rarm Q2 from run 4382. Figure is for s0 triggers only, but it looks nearly identical for hapdet triggers only. I used the formula:

qsq = 2 * Ebeam * Eprime * (1 - cos(theta_scatter))

I made a cut on only 1 track events. I also investigated using cuts on target theta and phi to get a cleaner distribution, but these additional cuts had little impact.

I will post results soon from more recent sampling DAQ runs.

Note that the average Q2 of 0.69 is considerably higher (some 10% higher) than the anticipated 0.62 GeV?

Figure 1