I think this is just a histogram binning issue. Using exactly 1/2
degree bins like Peter suggested, the effect disappears. I attached a
plot of Sectors 5 & 6 for one run:
On Feb 14, 2008, at 4:48 PM, Angela Biselli wrote:
> Sebastian Kuhn wrote:
>> Dear (former) EG1ers (and especially "oldtimers"),
>>
>> I am trying to remember what our final conclusion was regarding
>> the infamous "wiggle/theta oscillation" problem with EG1a - see
>> http://www.jlab.org/ccc/mail_archives/CLAS/eg1_run/msg00274.html
>> to jog your memory. I went through all my accumulated notes but
>> couldn't find any conclusive solution (and my memory is just not
>> as good as it used to be... ;-)
>> It appears possible that we have a similar problem in EG1b, see
>> http://www.jlab.org/Hall-B/secure/eg1/EG2000/sharon/theta_compare/
>> theta_compare_5_6.gif (and BoNuS, for that matter! -> http://
>> www.jlab.org/~slava/Check44/Check44_18/ThetaEL/
>> thetael_raw_0211_44_1_pre_el5gev.jpg ).
>>
>> Any recollections are welcome - Sebastian
> I found in my old notebook a printout of a web page about the
> wiggle problem. From the those notes it seems that the problem is
> NOT due to the rounding of numbers, since it was observed by Ralph
> using the Ntuple 10 and i was reproduced by Vipuli with GSIM.
> There is not final solution to the problem in those notes and I
> cannot recall anything else either.
> If you want I send send you a copy of those notes (I would need to
> scan them)...
> Cheers
>
> Angela
>
>
> --
> Angela Biselli
> Assistant Professor
> Physics Department
> Fairfield Universiy
> 1073 North Benson Rd
> Fairfield CT 06824
> 203-254-4000 ext 2192
>