Hi Richard,
I filled those three histograms (real data, MC and radiated MC) before
using any cuts, on events as they come straight out of reconstruction,
so no offsets were used.
If we look at just real data, before any cuts:
http://einstein.unh.edu/~adrian/WbeforeCutsZoom.gif
and after ALL elastic cuts:
http://einstein.unh.edu/~adrian/WafterCutsZoom.gif
we see that both roughly peak around 0.938 GeV/c^2, while the radiative MC
peaks roughly around 0.96 GeV/c^2.
Hope to understand this soon,
Adrian
On Tue, 14 Feb 2006, Richard G Milner wrote:
> Hi Adrian,
> The plots look interesting. I note that the radiated MC has a shift both
> from
> the data and the unradiated MC. This is in line with what we expected. Is
> it
> possible that the disagreement with the data arises from the fact that the
> data
> were analyzed using offsets which were generated without accounting for
> radiation?
> Thanks,
> Richard
>
>
> Quoting Adrian T Sindile <asindile@cisunix.unh.edu>:
>
>> Hi,
>> Please take a look at the comparison between real data, unradiated MC and
>> radiated MC for yield as a function of Q^2 (after all cuts, in one plot):
>>
>> http://einstein.unh.edu/~adrian/normYieldsComp.gif
>>
>> and as a function of W (with no cuts):
>>
>> http://einstein.unh.edu/~adrian/wComp2.gif
>>
>> The histograms have been again normalized to the integral of counts.
>> In both plots, blue is unradiated MC, black is real data, and red is
>> radiated MC.
>>
>> For the W plot, the agreement between radiated MC and real data is very
>> good up to W = 0.9 GeV/c^2, it is a little worse after that. The radiative
>> tails are pretty similar, in my opinion (note that no cuts were applied, so
>> there might still be junk in the real data used for this plot).
>>
>> I was in the middle of addressing Michael's third item below (actually, I
>> was trying to plot A(born)-A(born + MASCARAD)/A(born with error bars) -
>> suggested by Vitaliy last time) when the network started to crawl... hope
>> to have it by Wednesday.
>>
>> Adrian
>>
>>> -Status of radiated MC (ASUNH)
>>> Shown was the normalized yield as measured compared with the
>>> MASCARAD-MC result (with Hoehler form factors). Very good
>>> agreement. Suggested to plot
>>> 1) Unradiated and radiated MC result vs. Q2 after all cuts in one plot
>>> 2) Measured and MC yield as a function of W (without W-cut!)
>>> 3) The ratio of measured/MC yields (with errors) to spot details of the
>>> agreement
>>>
>>
>
>
--------------------------------- Adrian Sindile Research Assistant Nuclear Physics Group University of New Hampshire phone: (603)862-1217 FAX: (603)862-2998 email: asindile@unh.edu http://einstein.unh.edu/~adrian/
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