sPHENIX HCal discussion

[pinkenburg <pinkenburg AT bnl.gov>]

Hi Stefan, Emma,

what we tried to produce is an unbiased sample, the impact parameter 
range is from 0-20fm which covers pretty much everything (Dennis made 
some plot showing that there is hardly anything beyond that). This is 
what we call MB. The idea behind this sample is to get the background 
from pileup right. Initially we used 0-12fm which was way to central for 
background collisions leading to artificially high pileup in the tpc.

Except for a +-10 cm vertex cut we don't apply any trigger effect - I am 
sure the MBD will introduce additional distortions at the peripheral 
end. I would call this sample therefore unbiased (or just give the 
hijing impact parameter range which is what we did in the end). 
"Peripheral" indicates some selection of events which we didn't do here.

Chris


On 10/23/2022 9:46 AM, Stefan Bathe via sPHENIX-HCal-l wrote:
> Hi Emma,
>
> Very nice slides!  I have a few comments/questions:
>
> Comments:
>
> slide 4:  what you call “MB" on this slide (and on following slides) should 
> really be called “peripheral”, I think (according to the centrality distribution 
> shown, which peaks around 70 %, so b ~ 12 fm.—MB really means as close as you can 
> get experimentally to 0-100%).
>
> slide 7:  right figure:  would a plot be better to illustrate (lego, box, or 
> colz)?
>
> Questions:
>
> slide 6:  the reason E/p is not 1 for the calorimeter system (black curve) is 
> that the HCals are calibrated at the EM scale in the sPHENIX simulations, is 
> that correct?  Are these showers selected to start in the oHCal?  Why is 
> there then a difference between red and black?
>
> slide 7:  the percentage (0.013) and words (oHCal shower candidate) suggest 
> these are showers that start in the oHCal (the 23.9 % on slide 5).  So the 
> difference in E/p between red and black comes from the underlying event in 
> Pythia?  But it looks similar to the difference on slide 6, where there is no 
> underlying event.
>
> Best regards,
> Stefan
> -
> ---------------------------------------------------------------------------------
> Stefan Bathe
> Professor of Physics
> Baruch College, CUNY
> and RIKEN Visiting Scientist
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>
>
> > On Oct 21, 2022, at 16:56, Emma Grace McLaughlin via sPHENIX-HCal-l 
> > <sphenix-hcal-l AT lists.bnl.gov> wrote:
> >
> > Hi all,
> >
> > I am presenting on single hadron calibrations of the HCal at the DNP on 
> > Saturday 10/29/22. Attached are a draft of my slides. Comments and 
> > suggestions are appreciated.
> >
> > Thanks,
> > Emma McLaughlin
> > <DNP.pdf>_______________________________________________
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Christopher H. Pinkenburg       ;    pinkenburg AT bnl.gov
                                ;    http://www.phenix.bnl.gov/~pinkenbu

Brookhaven National Laboratory  ;    phone: (631) 344-5692
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