STAR HardProbes PWG

["Ma, Rongrong" <marr AT bnl.gov>]

Hello Isaac

For the HP-related triggers, what matters is the sampled luminosity rather the number of events. Of course, the ideal case would be sampling full luminosity, but as you noted the rates for dimuon and BHT1 are too high. For BHT2 (Upsilon) and BHT3 (gamma+jet) triggers, we should allocate enough bandwidths such that they can sample the full luminosity. 

One question: is the BHT2 trigger used for jet measurements in general?

For the dimuon trigger, our plan is to tighten the trigger time window cut and apply a pre-scale to reduce it to 1 kHz. 

I am not sure who is interested in analyzing BHT1 trigger, but it could at least serve as the bridge between MB and BHT2 triggers for trigger bias evaluation.

Best

Rongrong

On Jun 16, 2023, at 5:38 PM, Mooney, Isaac via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hi all,

As I mentioned in the PWG meeting on the 8th, we’ve been asked to give input on the prescales for HardProbes-related triggers for the upcoming high-luminosity data-taking period. Specifically, due to high rates from the dimuon and BHT1 triggers, these may require a high prescale to limit their bandwidth. Our request is for analyzers planning to use Run 23 data with these triggers to provide a desired overall number of events for each trigger in order to meet the physics goals for the analysis. If we assume a given number of weeks of running, this then gives a rough estimate of the prescale we should apply.

I’m also linking my slides from last week (https://drupal.star.bnl.gov/STAR/system/files/TriggerRates100k_Run23.pdf) with a few changes, including a rate table on the last slide estimated by Akio, along with some back-of-the-envelope calculations I added for the prescale of these two triggers.

Please let us know if you have any questions or input.

Thanks,

Isaac, Nihar, and Yi

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