This blog is to get ideas down on "paper" for writing an appropriate jet reader for a transverse analysis. In the near-term, I will be analyzing Run-11 data, however, I would like to keep an eye down the road for the Run-12 analysis which I expect will provide an even greater impact.

Initial Ideas

Pibero has laid substantial infrastructure with his marvelous Run-9 analysis. So, instead of reinventing the wheel, it seems reasonable to begin with what Pibero has wrought, adapting it for use with a transverse analysis. To this end, I begin with his GHP2011 code: /star/u/pibero/ghp2011.

Triggers

Pibero's primary trigger for Run-9 was JP2 with JP1 a secondary trigger. For Run-12, I anticipate I will focus most closely on JP triggers, though I my staple will probably be JP1. Regardless, it probably makes sense to develop the reader for Run-11, initially, with JP triggers in mind. This could pay dividends for Run-12. I would like to keep in mind the BHT triggers, as well, as the plethora of statistics may ultimately tip the scales in their favor, specifically for Run-11. Since Run-9, the DSM conversion formula has been E_T = (ADC-5)*0.236 GeV. For Run-9, the thresholds were as follows:

The JP2*L2JetHigh trigger takes around 1 GeV to turn on fully, so Pibero placed a starting limit of 8.4 GeV to satisfy the JP2*L2JetHigh trigger. With this marker in place, Pibero implemented the following trigger definitions:

• JP1
  • JP1 trigger fired and p_{T, jet} < 8.4 GeV
  • JP1 trigger fired, JP2 trigger did not fire, and p_{T, jet} > 8.4 GeV
• JP2
  • JP2 trigger fired and p_{T, jet} > 8.4 GeV

For Run-11 the trigger thresholds are the following:

In Rob's Run-6 study he focuses on jets with p_T > 10 GeV/c. This is to minimize the contribution from gluon jets which contribute nothing to transversity. However, in the future, I would like to leave open the possibility to evaluate effects such as gluon linear polarization, A_TT, A_N, etc., which may yield effects in gluon jets as well. Therefore, it will be useful to look at jets from all JP triggers. Additionally, it will be very interesting to evaluate VPDMB jets. While VPDMB jets will be very soft but also have significantly lower trigger bias. This will provide a very nice, data-driven way to evaluate the effects of the trigger on JP0.

First Try

As a first try, Pibero and Carl have helped me draft the following definitions:

• VPDMB
  • VPDMB trigger fired and p_{T, jet} > 5.0 GeV
• JP0
  • JP0 trigger fired and p_{T, jet} > 7.1 GeV
• JP1
  • JP1 trigger fired, JP0 trigger did not fire, and p_{T, jet} > 9.9 GeV
• JP2
  • JP2 trigger fired, JP0 trigger did not fire, JP1 trigger did not fire, and p_{T, jet} > 16.3 GeV
• AJP
  • AJP trigger fired, JP0 trigger did not fire, JP1 trigger did not fire, JP2 trigger did not fire, and p_{T, jet} > 16.3 GeV