Operators: kohlm yxiao karpiusp
Hi,
smooth data taking during shift from 16-24.
Switched to empty-target runs with run 2061, flipping helicity once per run.
All good runs 1979-1986 1988-1994 1997 2000-2001 2003-2005 2007-2009 2011-2016 2018-2024 2026-2030 2032 2036 2037
2039 2041-2044 2047-2048 2050 2052-2053 2055-2060 analyzed with lrn.C, flrn.C and charge.C.
Tried some analysis of cut variations. Without cuts, there are two satellite peaks in zwl and zwr visible, presumably caused by a combination of beam halo and ion polarimeter lenses.
The ghost peaks almost disappear after applying "good" cuts
"thetaw+momw+coplaw+zlrw+pleftw+erightw+InvMass_elas_R" (right sector)
"thetaw+momw+coplaw+zlrw+eleftw+prightw+InvMass_elas_L" (left sector).
Additionally, a tighter "zlrw" cleans up the rest of the satellite peaks. Asymmetry and counts spectra are attached. The asymmetries are very small.
I applied a loose Cerenkov cut on the electron arm (ncl/r>-1). This cut cleans up most of the satellite peak even without the other cuts, however the efficiency seems to be small. Corresponding asymmetry/counts plots for this addidtional cut on the Cerenkov is attached, too.
MK
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