Hi Michael,
In each bin a Gaussian was used - the point is the mean and the "error
bar" shows sigma from the Gaussian in that bin.
I should have made it clear...
Adrian
On Wed, 19 Oct 2005, Michael Kohl wrote:
> Adrian,
>
> what is the meaning of the error bars in each plot? Do they indicate the
> resolution (or width of each Gaussian) for every bin?
>
> Thanks,
>
> Michael
>
>
>
>
>
>
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> On Wed, 19 Oct 2005, Adrian T Sindile wrote:
>
>> Hi, Michael!
>> About momentum resolution in ep elastic - here is a plot I quickly found
>> while looking for something to show:
>>
>> http://einstein.unh.edu/~adrian/meeting0905/7wcCutsPhi14Pol7.gif
>>
>> In the first two rows of this plot I have:
>> 1) P_el - P_el(Theta_el) as a function of Theta_el;
>> 2) P_pr - P_pr(Theta_pr) as a function of Theta_pr.
>> The other rows are for similar and hopefully obvious comparisons.
>>
>> I believe the first is the relevant one (it shows the difference between
>> electron momentum and the calculated electron momentum using electron
>> theta, as a function of electron theta, for both left and right sectors -
>> and both means and sigmas are shown for each theta bin - bins of 1 degree
>> were used).
>>
>> I am not sure we can conclude the resolution is worse at higher electron
>> angle... but please tell me what you think by looking at the plot.
>>
>> Adrian
>>
>>> On momentum resolution:
>>> - In e,e'n VZ sees a worse resolution (width of the quasielastic peak in
>>> the W-Spectrum towards higher Q2, exceeding the Fermi-broadening
>>> - Not confirmed by the elastic peak in ed-elastic (CZ), however the
>>> phase-space (or electron angle-momentum combination) in ed elastic is
>>> different from e,e'N quasielastic.
>>> - The worse resolution at higher Q2 should be apparent in ep elastic
>>> (Chris, Adrian?), which covers a similar region of angle and momenta
>>> compared to quasielastic. If people could comment ...
>> k
>>
>
--------------------------------- 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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