sPHENIX Event Plane Detector discussion

[pinkenburg <pinkenburg AT bnl.gov>]

Hi Ejiro,

I sincerely doubt that this is pileup. The epd integrates over a single 
bunch crossing and for a single bunch crossing the pileup is somewhere 
in the sub percent range. Basically the events you get from the sims for 
the epd are single events without pileup. Also you can remove pileup 
events from your analysis if you want to make sure

Chris



On 4/27/2023 11:14 AM, Ejiro Umaka wrote:
> Hi all,
>
> I've been working on the event plane determination for the EPD (and 
> other subsystems). Initially (~ 2 years ago) when we first looked at 
> the EPD raw psi_2, we got a flat distribution, but the most recent 
> simulation results were not. The only thing I can think of as to what 
> changed between then and now is pile-up in the current simulations.
> I proceeded to look at the phi -weighted psi_2 distributions and they 
> are flat (attached)!
>
> I'd like to discuss this further at the EPD/bulk meeting next week.
>
> Best regards,
> Ejiro

--
*************************************************************

Christopher H. Pinkenburg       ;    pinkenburg AT bnl.gov
                                ;    http://www.phenix.bnl.gov/~pinkenbu

Brookhaven National Laboratory  ;    phone: (631) 344-5692
Physics Department Bldg 510 C   ;    fax:   (631) 344-3253
Upton, NY 11973-5000

*************************************************************