STAR HardProbes PWG

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

Dear Carl and Rongrong,

For pp200, run12 was with BHT2, threshold 18 is ~4.2 GeV, which is lower 
than AuAu200 case.
Because of lower background in pp200.

Thank you
Nihar



On 2023-10-24 08:06, Carl Gagliardi wrote:
> Hi Rongrong—
>
> The BSMD is __SLOW__.  So anything that can be done to tame the rate
> without adversely impacting the physics is a good thing.  Looking back
> at trigger configurations, L2Gamma has been fed by the funny BHT*BJP
> combo during the past few pp200 runs.  However, during the recent
> AuAu200 runs, it was fed by BHT3, with a threshold at 25, equivalent
> to 5.9 GeV in a single tower.  (I checked 2011 and 2016; suspect
> it’s also true for 2014, but didn’t look.)  This requires a more
> localized energy deposit at Level-0, and hence has a lower rate.
>
> That’s the hardware-oriented picture.  For the physics-oriented
> picture, you should talk to Saskia, Peter, Nihar, …, rather than me.
>
> Hope this helps!
>
> Carl
>
> From: Ma, Rongrong <marr AT bnl.gov>
> Sent: Monday, October 23, 2023 8:12 PM
> To: Gagliardi, Carl A <c-gagliardi AT tamu.edu>
> Cc: STAR HardProbes PWG <star-hp-l AT lists.bnl.gov>;
> nihar AT rcf.rhic.bnl.gov
> Subject: Re: [Star-hp-l] [Star-pwgc-l] Fwd: Run24 Trigger board
>
> Hello Carl Thanks for the comment. Sorry, I am not familiar with the
> details of L2Gamma trigger. Do you mean that the rate of BHT2
> (threshold = 18) trigger is too high for L2Gamma, such that we need a
> BHT3 trigger? Thanks. Best Rongrong On
>
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> Hello Carl
>
> Thanks for the comment. Sorry, I am not familiar with the details of
> L2Gamma trigger. Do you mean that the rate of BHT2 (threshold = 18)
> trigger is too high for L2Gamma, such that we need a BHT3 trigger?
> Thanks.
>
> Best
>
> Rongrong
>
> > On Oct 23, 2023, at 3:07 PM, Carl Gagliardi <c-gagliardi AT tamu.edu>
> > wrote:
> >
> > Hi Rongrong, All—
> >
> > A note from the peanut gallery…
> >
> > During 2015, the BHT3 trigger bit was utilized for some other
> > purpose.  (I think UPC J/psi, but won’t swear to that.)
> > Therefore, L2Gamma was fed by a funny composite trigger that
> > included BHT and BJP constraints.  There is a reasonable chance that
> > the BHT3 trigger bit will be freed up.  If so, it would be a natural
> > choice to feed the L2Gamma routine.
> >
> > Stay Healthy!
> >
> > Carl