STAR HardProbes PWG

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

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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