STAR HardProbes PWG

[Rosi Reed <rosijreed AT lehigh.edu>]

Hi folks,

I guess the question is - do we have the bandwidth to change the threshold?  There are still many weeks of run time ahead of us, and it is nice to be able go down relatively low in pt for all the structure and splitting measurements.  Lowering the threshold would change the trigger id, which would make it rather straightforward.  An analyzer who doesn't care can simply require a higher threshold offline for their entire analysis.  But I don't feel strongly.

Cheers,

Rosi

On Mon, Jul 15, 2024 at 11:16 AM Mooney, Isaac via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hi Carl,

Sorry for my delayed response, I just returned from travel. I’m not speaking on behalf of the HardProbes PWG (I don’t think the issue was discussed at last week’s meeting), but I agree with your feeling that it would probably be better to leave it at this higher threshold rather than change it this late in the run. Others can also chime in, and we can discuss it at this week's meeting.

Thanks,

Isaac

On Jul 7, 2024, at 16:42, Carl Gagliardi via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hi All—

 

A while ago I realized that the mid-rapidity EMC gains are lower than “nominal,” making our effective BEMC/EEMC thresholds higher than we had intended (or they were during 2015).  At the time, I guesstimated that the gain difference was 15~20%.  To be conservative, I suggested shifting the various trigger thresholds by ~16%, and that’s what we did.

 

Now that we have more data and I’ve had a better chance to look at it systematically, it appears that our current thresholds are still higher than “desired” by ~5%.  In other words, the effective JP2 E_T threshold is around 7.7 GeV, whereas it was 7.3 GeV during 2015.  Similar scaling applies for the other EMC-based JP and HT triggers.

 

Should we adjust thresholds again or live with them as they are?  At this late date, my gut says we should leave them alone.  However, some of you might have good arguments to make another round of threshold adjustments, at least for some of the triggers.  So I’m sending this message to a bunch of different physics-related and operations-related e-mail lists.

 

Speak now or forever hold your peace!

 

Stay Healthy!

Carl

 

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Rosi Reed
Associate Professor, Physics Department
Lehigh University
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