STAR HardProbes PWG

[Nihar Sahoo <nihar AT rcf.rhic.bnl.gov>]

Hello Rongrong,

Please find my replies inline.

On 2024-03-29 20:06, Ma, Rongrong wrote:
> Hello Nihar
>
> Thanks for the feedback. For BHT1, I suspect we need to couple it with
> VPD100 to tame the rate. To summarize, here is what we want to
> propose:
> 1) BHT1*VPD100 (prescale > 1 if needed, aim for a rate of 200-600 Hz?)
>
> 2) BHT2*BBCMB (prescale = 1)
> 3) BHT3 and BHT3*L2Gamma (prescale = 1)
> 4) dimuon with wide trigger window (100-300 Hz with prescale = 1)
Yes, I agree.  for case 1) prescale can be varied depending on rate.

> For low luminosity pp runs, I think the strategy to have the
> interaction rate as low as possible but still high enough to saturate
> our DAQ rate.  We can run those BHT triggers, but I do not think they
> will sample more luminosity than what MB trigger takes. They will
> serve mostly as a means of tagging events for easier analysis later
> on, which of course is useful. Since they do not contribute any
> additional DAQ rate (almost 100% overlap with MB trigger), should be
> safe to run them.
>
> Why do we need to turn on BSMD during low-lumi running? I think the
> sampled luminosity will be no where near what's needed for direct
> photon analysis. Wouldn't it be better to save it for regular pp
> running?

After sending email and thinking on it, I find myself wrong. Low lumi pp 
data with HT trigger does not make any sense for any HP related physics. 
Never mind.

Finally, as you mentioned above 1-4 are our proposal from HP-pwg if 
there is no suggestion from other PAs.

Thank you
Nihar




> Thanks.
>
> Best
> Rongrong
>
> > On Mar 29, 2024, at 4:26 AM, Nihar Sahoo <nihar AT rcf.rhic.bnl.gov>
> > wrote:
> > Hello Rongrong and all,
> >
> > Unfortunately, I could not join the last hp-pwg meeting.
> > I listened recordings.
> > Other PAs can comment and suggest on it based on their requirement.
> > Here is my suggestion for pp run24.
> >
> > On your proposed trigger slide:
> > 1) For Run24 p+p 200 GeV, I would propose to select "BHT1*BBCMB" or
> > "BBHT1*VPD100" with threshold 11.
> > Because we have previous data set with similar trigger detector
> > condition. Better to keep similar condition this year too.
> >
> > If anyone wants to have with EPD that is fine, then they should have
> > certain plan. please let us know.
> >
> > 2) same for BHT2*BBCMB with 18 threshold
> >
> > 3) For L2gamma,  we are going to set Threshold 25 (5.9 GeV).  then
> > "BHT3 * L2Gamma" would be preferable (pre-scale 1 definitely)
> > For our gamma/pi0 analysis, we don't go below 7 GeV offline trigger
> > for analysis. So that is fine.
> > Beside, for pp run, I think we should take also low lumi data with
> > BSMD; and without switching on/off though out the run (if possible).
> > I am discussing with Oleg and Lijuan to know their suggestion.
> >
> > Question:
> > Do we plan to take BHT1/2 trigger data during low lumi pp run? I
> > prefer to use BHT1*BBCMB, BHT1*VPD100, and BHT2*BBCMB also. We may
> > come up with some physics for future analysis with high lumi pp
> > data.
> >
> > Thank you
> > Nihar
> >
> > On 2024-03-28 20:05, Ma, Rongrong via Star-hp-l wrote:
> > Hello All
> > Here are the slides I discussed today:
> https://drupal.star.bnl.gov/STAR/system/files/20240325_Run24Trigger.pdf.
> > Best
> > Rongrong
> > On Mar 25, 2024, at 11:07 AM, Mooney, Isaac via Star-hp-l
> > <star-hp-l AT lists.bnl.gov> wrote:
> > Hi all,
> > Thanks to everyone for a great Collaboration Meeting from the Hard
> > Probes side with a lot of exciting updates and progress, and helpful
> > discussions. I hope those of you who attended in person had safe
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> > We will have our regular HP-PWG meeting this Thursday (March 28) at
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> > Please also send your presentation slides a few hours before the
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> > Thanks,
> > Isaac, Nihar, and Yi _______________________________________________
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