[Olympus] ToF rates from Monte Carlo

[Michael Kohl]

Dear Norik,
yes, I agree and pointed that out. Now we need to refine the analysis 
within the cooker framework, apply all calibrations in the TOF plugin, and 
finetune the MC (actual geometry etc.)

We should also assess the efficiencies with suitable trigger types and 
by combining with WC information.

Best regards
   Michael


On Mon, 30 Apr 2012, Norair Akopov wrote:

>
> Dear Michael,
>
> I would say the agreement for the relation between the rates for
> various charge*polarity cases we've extracted from data and Axel
> reproduced with MC is quite good. This is clear indication on reasonable
> combination of ADC/TDC cuts and coplanarity condition, as well the
> background subtraction procedure we used for this analysis to select the
> elastic events.
>
> Best regards,
>
> Norik
> On Mon, 30 Apr 2012, Michael Kohl wrote:
>
>> Dear Axel,
>>
>> this is a very nice study.
>>
>> Regarding your solid angle variation argument, would it be possible to
>> plot the overall theta vs phi for all accepted events, and also broken
>> down by bar number?
>>
>> Another source of systematics is the controversy about the target and/or
>> the field map relative to the detectors. Each of the three could be off by
>> a constant delta_z ~= 130 mm. I'll send a separate note on this when I
>> feel less confused.
>>
>> I would not be surprised if that affects the solid angle by some ~20%.
>> The simulated acceptance change between even (++,--) and odd (+-,-+)
>> charge*polarity seems to be in agreement with the TOF analysis by the
>> Yerevan group.
>>
>>
>> Both Alexander and I won't attend today's meeting while we are crossing
>> the Atlantic.
>>
>> Best regards
>>     Michael
>>
>>
>>
>>
>> On Sun, 29 Apr 2012, Axel Schmidt wrote:
>>
>>> Dear all,
>>> 	After we had discussions at the recent collaboration meeting about the effect of the magnetic field on the expected rates in the ToFs, I went ahead and ran a simulation using the OLYMPUS Monte Carlo to address this topic.  I've written up the results, which I will attach, and also post to the wiki.  Please let me know if you have any comments, questions, or suggestions.  We can discuss any ideas at this week's Monday meeting.
>>> Best regards,
>>> Axel
>>>
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>>
>> +---------------------------------------------------------------------
>> | Dr. Michael Kohl, Assistant Professor and Staff Research Scientist
>> | Physics Department, Hampton University, Hampton, VA 23668
>> | Jefferson Lab, C117, 12000 Jefferson Avenue, Newport News, VA 23606
>> | Phone: +1-757-727-5153 (HU), +1-757-269-7343 (Jlab)
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>> | Deutsches Elektronen-Synchrotron DESY, Bd. 66, Rm. 6,
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+---------------------------------------------------------------------
| Dr. Michael Kohl, Assistant Professor and Staff Research Scientist
| Physics Department, Hampton University, Hampton, VA 23668
| Jefferson Lab, C117, 12000 Jefferson Avenue, Newport News, VA 23606
| Phone: +1-757-727-5153 (HU), +1-757-269-7343 (Jlab)
| Fax:   +1-757-728-6910 (HU), +1-757-269-7363 (Jlab)
| Email: kohlm at jlab.org
| Cell:  +1-757-256-5122 (USA)
|
| Deutsches Elektronen-Synchrotron DESY, Bd. 66, Rm. 6,
| Phone: +49-40-8998-6406, Cell: +49-171-101-1967
+---------------------------------------------------------------------