[Olympus] Report to PRC

[Michael Kohl]

Hi,

just a few quick comments while reading:

You keep saying that the SYMB is expected to provide the best measure of 
the luminosity. What is this based on? Just the statistical error?

The sensitivity of the acceptance to SC parameters is a very delicate 
problem, and even the theoretical accepted yield ratio of e+/e- including 
annihilation is a very big challenge.


What are the double peak structures in the MC non-annihilation events 
(Fig. 2b)?

Figure 3 - SYMB integration box size - is that meant to be the 2D cut for 
the integration of the peak? Is background subtracted for the 'integral'?
Should it not be the goal to determine the integral independent of the 
cut?

What is the impact of the refined magnetic field in the SYMB region 
(Figure 4)?

BPMs: the study determines the relation between both types of readout 
electronics. The absolute calibration of the BPM then follows from the 
survey.

Should we mention how big the BPM variation is?
Then we should also mention that the effect on 12-deg is probably 
negligible.

For the pid probablity assignment between positron and proton, the 
tracked momentum, path length and time-of-flight could be combined to 
compute the "reconstructed mass", which can then be correlated against 
the energy deposited. This could be done for any combination of TOF bars 
to study the discriminative power of the energy deposit.

Fig. 14 Momentum resolution: how is it defined here? Assuming elastic 
kinematics, which variable is used to compute the candidate momentum?
This way it is rather a 'residual', since this quantity would have 
uncertainty contributions from two variables.

Best regards
   Michael



On Mon, 3 Feb 2014, Douglas Kenneth Hasell wrote:

> Dear Colleagues,
>
> 	Attached is the draft report I would like to send to the PRC later today.  As I stated earlier I don't think we should expend any extra effort in preparing this report.  It should just reflect our current status.
>
> 	Please read through the report and send me an E-mail if I have mis-represented anything or made any errors.  This was put together very quickly with my naive understanding so I apologize in advance for all my mistakes.
>
>                                                    Cheers,
>                                                            Douglas
>
> 26-415 M.I.T.                                 Tel: +1 (617) 258-7199
> 77 Massachusetts Avenue                       Fax: +1 (617) 258-5440
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>
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| Dr. Michael Kohl, Associate Professor and Staff Research Scientist
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