STAR HardProbes PWG

[Carl Gagliardi <c-gagliardi AT tamu.edu>]

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