High-pT hadronic trigger using electromagnetic calorimeter with the STAR detector

We derive a new method to improve the statistics of identified particles at high transverse momentum (pT) using online-triggered events by the STAR Barrel electro-magnetic-calorimeter (BEMC) detector. The BEMC is used to select charged hadrons (π±,K±, and p(p¯)) via hadronic shower energy deposited in the BEMC. With this trigger, the statistics of the high pT particles are significantly enhanced (by a factor of up to ∼100 for STAR) with trigger efficiency up to 20%. In addition, weak-decay V0s (KS0 and Λ(Λ¯)) can be reconstructed by selecting the BEMC-trigger hadron as one of the decay daughters. We also show that the trigger efficiency can be obtained reliably in simulation and data-driven approaches, and final results from new method are compared with previous published results.