[Clas_cascades] simulation time problem?

[Zhiwen Zhao]

Hi, Stepan

Can you check the simulation package to see if I have used any wrong configuration?
That's something I doubt but can't find problem.

Thanks

Zhiwen


On 4/21/2010 10:13 PM, Stepan Stepanyan wrote:
> Zhiwen,
>
> Interesting, your results go against what I understand.
> I am sure I missing some simple thing here.
>
> Stepan
>
> Zhiwen Zhao wrote:
>> Hi, All
>>
>> http://clasweb.jlab.org/rungroups/eg3/wiki/index.php/Eg3_simulation
>> I add more plots and description, particular the plots use vertex time
>> calculated without vertex term.
>>
>> I still think the time in SCPB is calibrated TOF time so it can be
>> used in the formula without additional "starttime" mentioned by Stepan.
>>
>> For data, the photon time in tagger is calibrated at target center, so
>> to compare it to particle vertex time, the vertex term is needed. For
>> sim, if I use photon time at target center, the vertex term is needed
>> too. As shown in those plots,the vertex term will make peak sharper
>> and nicer for data and sim.
>>
>> The main problem I have now is the time diff is not centered around 0
>> for sim, I will need photon time = (-56)/c_light to make that happen(
>> please refer to the plots). This makes me wonder either some of my
>> understanding is wrong or my simulation configuration is wrong.
>>
>> Please comment.
>>
>> Thanks a lot
>>
>> Zhiwen
>>
>>
>>
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