Re: [Brahms-l] INEL trigger efficiency in pp

Hello.  I guess I made a mistake in efficiency in non-single diffractive 
events since 10% increase in dn/deta is not the same as 10% in cross 
section.  As JH suggested, I tried to run Hijing with non-single 
diffractive option using IHNT2(13) =3 option.  But, I did not see any 
change in dn/deta.  Therefore, I am not quite sure how to run Hijing 
with this option.

Hiro

Hironori Ito wrote:

> Hello.  Since so many people asked about INEL efficency, I just dig up 
> my files.  (I thought these things are checked by someone who are 
> writing Ph.d thesis. :)  )  Here is the conclusion I made.
> 1.  From the Hijing 1.383, our INEL counter is about 72% efficient. 
> (see http://www4.rcf.bnl.gov/~hito/run03/hijing_pp_inel_efficiency.gif )
>
> 2.  Now, looking into what HIJING 1.383 really is for pp.  I looked at 
> dn/deta from raw hijing output.  At, eta=0, it is  2.2 .  From UA5 
> ppbar results (see  http://pdg.lbl.gov/2002/contents_plots.html  you 
> can find a postscrip file there.), it shows 2.2 with the words saying 
> "The number per pseudorapidity interval is about 10% higher if the 
> rate is normalized excluding singly diffractive events rather than to 
> the total inelastic rate." This tells me that Hijing pp produces the 
> total inelastic collisions.   (This also means the following.  Since 
> we don't trigger on  single diffractive events, what we can measure is 
> 90% efficient at most.  Our INEL is 72/90=80 % efficient for 
> non-single diffractive events.)
>
>
> If people need it, I can also dig my old files for dAu.
>
>
> Hiro
>
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