Upsilon Trigger Efficiency in pp

Rosi Reed

UC Davis

Upsilon 400 Embedded Series

Left Figure is MC Eta vs Phi distribution for upsilon electron daughters with at least 1 hit in the BEMC

Right Figure is MC pT distribution of upsilons

Upsilon 400 Embedded Series

Left Figure is upsilon MC rapidity distribution for upsilons with both daughters outside of eta<0 and phi < 0

Right Figure is upsilon MC rapidity distribution

Acceptance Efficiency

Right Figure is acceptance efficiency for electrons with at least one hit in the BEMC from upsilon 600 series. Asymmetric due to showering off endcap.

Left Figure is the mid-rapidity efficiency where acceptance is defined as both upsilon daughter leaving at least Emin energy in the BEMC

Acceptance Efficiency

Acceptance efficiency versus MC upsilon rapidity and pT where the denominator is comprised of all upsilons where the daughters are not located in eta < 0 and rapidity < 0

L2 Trigger Efficiency

L2 trigger efficiency in Upsilon 400 embedded series

Upsilon Trigger EfficiencySummary of efficiency calculations

Error efficiencies done assuming gaussian error -> Needs to be revisted

Conclusions

• Need embedded files for both Au-Au and pp to continue

• Full presentation to be given next week at the analysis meeting

Relevant blogs

http://drupal.star.bnl.gov/STAR/blog-entry/rjreed/2008/sep/12/upsilon-trigger-efficiency-calculation-pp2006-triggers-upsilon-400-series

http://drupal.star.bnl.gov/STAR/blog-entry/rjreed/2008/sep/10/upsilon-trigger-efficiency-calculation-pp2006-triggers-acceptance-2

Back Up Slides

Upsilon 400 Embedded Series