[G12] MC TOF Resolution

[Saini, Mukesh]

Hey Guys,

I am attaching the plot that is included in the analysis report from the simulation of " p pi+ pi- > p rho " channel.

The study mainly focused on the resolution of the missing mass through DC smearing in the simulation. The main thing the smearing parameters accomplished was matching the DC residuals of the MC and the Data obtained from the tracking algorithm. It was found that this smearing only partially accounted for the increase in the width of the missing mass for my pKK channel.

When I looked at the TOF resolution for the simulated channel, I found that the resolutions were pretty similar so we could either ignore the "-f" flag or set it to 1. See attached plot. If you think its different for your analysis channel, you can set it to something higher that will give you a match and In my opinion should be an acceptable practice across different g12 analyses.

I will check it for the phi-eta and get back to everyone in a couple of weeks. I will be inactive for a while longer, till I find a Job. 

Regards,
Mukesh.
 
________________________________________
From: g12-bounces at jlab.org [g12-bounces at jlab.org] on behalf of Lei Guo [lguo at jlab.org]
Sent: Thursday, July 18, 2013 2:38 PM
To: Michael C. Kunkel
Cc: Jason Bono; g12 at jlab.org
Subject: Re: [G12] MC TOF Resolution

On Jul 18, 2013, at 1:45 PM, Michael C. Kunkel wrote:

>
> On 7/18/13 1:57 PM, Lei Guo wrote:
>>
>> On Jul 18, 2013, at 1:39 PM, Michael C. Kunkel wrote:
>>
>>> Hi Lei,
>>>
>>> The blue is MC and red is data.
>>> Yes the data is wider than the MC but normal timing cut is 2ns,
>>> which is well in bounds for both sets of data.
>>
>> Do you mean +-1ns?
> No, I mean 2ns, some would say this is liberal so even a 1.5 ns cut
> is well inbounds for my 2 sets of data.

If you used +-2ns cut, I don't see it being a problem for you. But for
people analyzing kaon data, I suspect that are using a tighter timing
cut, and this MC/data resolution discrepancy should be taken into
consideration, if they are doing any kind of acceptance correction and
cross section calculations.

Lei
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