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HBD analysis update

This update provides a first analysis of electrons in the HBD, including vertex and quality cuts, RICH and EMC specifications, as well as matching cuts. Statistics from RB runs indicate a significant number of electrons in the central arms.

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HBD analysis update

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  1. HBD analysis update I. Ravinovich for the HBD analysis team I. Ravinovich

  2. First look at the electrons in HBD • Vertex cut: +/- 20 cm • DC quality cut: 31 or 63 • 3s matching cuts on DF and DZ to EMC and PC3 • RICH: n0>2, c2/npe<10, disp<5 • EMC: 0.6 < E/p < 1.2 • HBD: first search for a closest pad with > 40 ADC counts -> 5 p.e. at a gain of 5000 • If partner is found then sum 6 pads around a partner with > 8 ADC counts (1 p.e.) • Matching cuts to HBD: |F| < 0.03 rad, |DZ| < 3 cm • Statistics used in RB runs is ~6.7 M MB events (many thanks to Anne and Carla) where we have ~1.5 M electrons in Central Arms I. Ravinovich

  3. How it looks like if we sum up EN3 and WN3 modules? Looks like we have ~17 p.e. The next question is how to separate the single electrons from the doubles which are from the close pairs, namely conversions and Dalitz pairs with a small opening angle. I. Ravinovich

  4. EN3 and WN3 modules separately. Looking at each module separately is extremely important for several reasons, one of them is relative QE measurements done in IR with a flash lamp. EN3 WN3 I. Ravinovich

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