Re: [Brahms-dev-l] 62 GeV

Hi,

this is good to hear. A couple of questions:

On Mon, 2006-11-13 at 18:26 -0500, Flemming Videbaek wrote:
> I spend some time over the weekend, looking in more details. I will
> come back later to the details but the following plot shows
> the bottom line
> i)  there are position/angle dependent efficiencies in tpm1, tpm2
> (thanks to kris this could be evaluated)
> ii) The charged hadrons are assumed to be pions i.e.
> decay/absorption/chisq/target cut  is included using the
>      standard. stuff
> iii) The spectrum is evaluated not requiring CC but just with a MRS
> track, and normalized from 12->36 mb, since the overall norm still
> comes from the trigger 5 distributions.
> iv) tracks must point to tofslat 40-110
> v) pion acceptance are assumed.

Hmmm, I dont quite get this... So you take all tracks, not requiring any
specific trigger and then normalize? How do you determine if the track
comes from the vertex if you dont have a CC vertex, do you use the BB
instead? Or do you only use the track ChiSq instead? 

I really need some more explanation here!!!

>  
> http://www4.rcf.bnl.gov/~videbaek/analysis/IsrComparison.png

I'm not too good with log scales, but it looks like there is still a
difference (maybe small) at low pt for positives or?!?

>  
> shows the cross sections, and the curves are the parametrization of
> the +/- h of the Z.Phys reference for ISR data.
> I also read several of the ISR references, and it seems to me they in
> general apply the absorption decay corrections,
> so this should be done when we compare.
> There could still be issues in this analysis, but overall it looks
> pretty good - 
> thus I think we can figure out how to deal with the pp reference
> spectra for hadron analysis..
>  
> Flemming

What is the green line below the BRAHMS and ISR data for positive pt?

Thanks for the update!!! Maybe I then can use our own pp ref at mid rap
for my qm proceeding...

Cheers,
	Truls

>  
> --------------------------------------------
> 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
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