[G12] vert2 function

[Michael Kunkel]

No surprise that you do not understand, I'll try in the future to talk more Weygand like, if my blood pressure will allow it.

What I am saying is, there is nothing special about  that vert2 function. I have been using an exact code in ROOT. This function is the function I mentioned during the last G12 meeting, but it was obvious you checked out of the conversation at that point. 

R = 1 is the code syntax not mine, my ROOT code reads R = 1., which happens often for lepton pairs.

Plots are coming today, 

We have been over what "BR" means 3 times now, this would make it a 4th. BR is shorthand for Best Regards.

BR
MK

BR
MK

Sent from my iPhone

On Mar 22, 2013, at 9:51, Dennis Weygand <weygand at jlab.org> wrote:

> Not sure what you are saying here....
> 
> 
> 
> On Mar 20, 2013, at 10:32 PM, Michael C. Kunkel wrote:
> 
>> Greetings,
>> 
>> I looked into the workings of vert2. The method of obtaining the vertex for 2 tracks in this method is no different than the method I have been using for years. The problem with this method is that it will fail if the tracks are parallel, which is usually the case for conversions and low mass e+e- events (the problem are in which we are investigating).
>> 
>> Below is a the snipet of the code to prove it
>> 
>>   /*calculate dot product of direction unit vectors*/
>>   R = v3dot(line1.dir,line2.dir);
> 
> R will never be '1' as R is I suspect a float (or double)
> 
>>   
>>   if(R==1){ /*parallel to beamline*/
>>     /*returns a negative distance so know that it was not calculated*/  
>>     return;
>>   }
>> 
>> In this case beamline is not used, this is a regurgitated function used for another program that calculates the vertex of a particles from the beamline if # of tracks ==1, otherwise all tracks in TBTR.
>> 
>> I will provide plots tomorrow, I wanted to give a heads up about the code, and why this might not be useful for either side of the conversion debate.
> 
> Do you have the plots?
> 
>> 
>> BR
> 
> 
> I understand the MK, but who is BR?
> 
> 
>> MK
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> 
> --
> Dennis Weygand
> weygand at jlab.org
> (757) 269-5926 (office)
> (757) 870-4844 (cell)
> 
> 
> 
> 
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