> was thinking that the coplanar events lay in the dominant peak of
> ptl+ptr and tried to confirm this by plotting ptl:ptr cut on these min
> and max bins
yes they do, you can also use some mild ADC cuts. I have a suggestion. Why
don't you use this events to check your corrections and eventually retrofit
the worst parameters by hand ? We understand you can have background but
we don't care as long as it symmetric.
What about the self-timing peaks ? Do they move or was something
else moving in your tdc offset analysis ?
-- ________________________________________________________________________________ Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124 research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^On Fri, 22 Nov 2002, Peter Karpius wrote:
> Tonight was another analysis shift. > Chi was working on generator code. > Work also continued on the offset code > with a push to use ep events to determine the offsets. But how to easily > determine ep events for every TOF without the offsets in the first place? > > I created a macro that I was hoping could be applied toward > rough coplanarity cuts but am unsure if this is possible. It essentially > fills a histogram of ptl+ptr from eep and cuts on min and max bins as > determined by bin content. The code plots some lines to illustrate these > cuts. I was thinking that the coplanar events lay in the dominant peak of > ptl+ptr and tried to confirm this by plotting ptl:ptr cut on these min and > max bins. Please see the attached plot (ignore the lower left histogram). > The upper left is ptl+ptr with lines representing cut parameters. The > upper left is ptl:ptr cut on these parameters - it looks slightly skewed. > The lower right is the uncut ptl vs ptr. I am looking for a quick ballpark way to > get coplanar events to use in the offset macro. > > > > Pete > > > > ---------------------------------------------- > Pete Karpius > Graduate Research Assistant > Nuclear Physics Group > University of New Hampshire > phone: (603)862-1220 > FAX: (603)862-2998 > email: karpiusp@einstein.unh.edu > http://pubpages.unh.edu/~pkarpius/homepage.htm > ---------------------------------------------- > > >
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