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Notes following-up from the Hall C Analysis meeting on 5/17¶

Notes from Dave Mack on BCM calibrations

• The bcm constants to use for now are the same one's we're having Eric P load for the F2/EMC Pass 1 analysis at https://github.com/JeffersonLab/hallc-replay-f2xem/blob/master/PARAM/GEN/gscalers.param .

• These are from Deb's March results. The March bcm calibration was large and roughly in the middle of the run. You can see the quality of the fits in the ATTACHED.

• We haven't done a global analysis yet, nor have I resolved all discrepancies between Deb and Deepak. These values are just a +-2% place-holder since F2/EMC wanted to replay all their runs sooner rather than later.

• All the BCMs are linear down to very low currents, so the only things that affects a lumi analysis between 5 and 70 muA are:

• the offsets are uncertain to about +-0.1 muA. (So Carbon Yield vs I can be expected to deviate by O(1)% at 10 muA.) If calibrations are stable, a global analysis will reduce this.

• my slight preference would be to use BCM4A for a lumi scan. The only bcm I would NOT use for a lumi scan is BCM4B since it was almost as noisy as the Unser signal. (eg, note the higher Chi2/ndf for this channel in Deb's plots)

Notes from Mark on tree variables for tracking efficiency

• The tree variable for the tracking efficiency is H.hod.goodscinhit

• For the tracking efficiency calculated in the report file

HMSScinGood           H.hod.goodscinhit == 1
HMSGoodBetanotrk      H.hod.betanotrack > 0.8 && H.hod.betanotrack < 1.3

HMSScinShould         HMSScinGood && HMSGoodBetanotrk && !hmsDCany_large
HMSScinShoulde        HMSScinShould && H.cal.etotnorm > 0.6&& H.cal.etotnorm < 2.0&& H.cer.npeSum > 0.5
HMSScinShouldh        HMSScinGood && H.cal.etotnorm <0.6&& H.cal.etotnorm>0.0&& H.cer.npeSum < 0.5

HMSScinDid            HMSScinShould && H.dc.ntrack > 0
HMSScinDide           HMSScinShoulde && H.dc.ntrack > 0
HMSScinDidh           HMSScinShouldh && H.dc.ntrack > 0

• H.cal.etotnorm is the ratio of the total calorimeter energy to the central momentum so it does not involve tracking.

• H.hod.goodscinhit is set to 1 if certain scintillator criterion are met. This code is in the method THcHodoscope::TrackEffTest