STAR HardProbes PWG

["Mooney, Isaac" <isaac.mooney AT yale.edu>]

Hi Carl,

We had a discussion today in the working group meeting and from those who spoke up the preference was to leave the thresholds the same.

Thanks,

Isaac

On Jul 18, 2024, at 07:20, Nihar Sahoo <nihar AT rcf.rhic.bnl.gov> wrote:

Hello All,

Sorry for my late response.
A few percentage change in threshold might not affect the analyses.
But I think it is safe to keep the threshold same as before.
We can discuss in details at today's meeting.

Best
Nihar








On 2024-07-15 20:46, Mooney, Isaac via Star-hp-l 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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