Re: [Brahms-dev-l] m2 vs p...

Hi,

The eff speed of light only matter for the y-calculation , I blieve ; I do not think it appers in the 
time-calculations. I do NOT understand how it can be 25 in the AuAu. Typically they are ~40%
of speed-of light so the 25 is silly. This would also imply the y in slat wil not match track -y
(assuming Vdrift is properly calibrated)

Flemming
--------------------------------------------
Flemming Videbaek
Physics Department 
Bldg 510-D
Brookhaven National Laboratory
Upton, NY11973

phone: 631-344-4106
cell:       631-681-1596
fax:        631-344-1334
e-mail: videbaek @ bnl gov
----- Original Message ----- 
From: "Truls Martin Larsen" <trulsml_at_nbi.dk>
To: "Kris Hagel" <hagel_at_comp.tamu.edu>
Cc: "Brahms Devel" <brahms-dev-l_at_lists.bnl.gov>
Sent: Thursday, June 14, 2007 10:43 AM
Subject: Re: [Brahms-dev-l] m2 vs p...


> Hi,
> 
> yes it must be a bad calibration... But I struggle to see what is bad.
> Attached is the TimeOffset calibration for the same slat (23), and also
> the beta vs p dist.
> 
> Which is the effective speed of light in TFW2, I think I was told to set
> it to 13.4... Is that correct? I can see in AuAu_at_200 it is set to 25???
> It this eff speed is commited before one does the time offset calib, and
> I think it is used in this step... though it is strange that it works
> for some slats and not others...
> 
> Cheers,
> Truls
> 
> 
> 
> On Thu, 2007-06-14 at 09:14 -0500, Kris Hagel wrote:
>> Truls,
>> I don't think it can be anything other than a bad calibration for
>> those slats.  Since the lines are sharp, it would not be the slewing
>> calibration.  Rather, I think it looks like the time offset
>> calibration.  You can look at p vs beta.  The high p pions should be
>> near 1.  My guess is that you will find that the high p pions are not
>> at beta=1
>> 
>> Kris
>> 
>> Truls Martin Larsen wrote: 
>> > Hi,
>> > 
>> > does anybody know which part of tof calibration that can make a m2 vs p
>> > distribution look like the one in attached file. In this setting I have
>> > some slats with normal distribution, and some slats that give results as
>> > the attached gif. This rules out any mistake in the slewing I think, as
>> > that is only done once. I cannot see big/significant difference in
>> > numbers commited to the calib DB between good and bad slats...
>> > 
>> > All help and ideas appreciated!
>> > 
>> > Cheers,
>> > Truls 
>> >   
>> > 
>> > 
>> > ____________________________________________________________________
>> > 
>> > 
>> > 
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>


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