Hadronic Trigger using electromagnetic calorimeter and particle   identification at high-pT with 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 Barrel Electro-Magnetic-Calorimeter (BEMC) detector. The BEMC is used to select hadronic interaction and energy deposit from showers created by charged hadrons ($\pi^{\pm},K^{\pm}$ and $p$($\bar{p}$)) in the BEMC. With this trigger, the statistics of the high \pt particles are significantly enhanced by about a factor of 100 with selection efficiency up to 20%. In addition, resonant states ($\rho^0$, $K^{\star}$) and weak-decay V0 (\Ks and \La(\aLa)) can be constructed by selecting the BEMC-trigger hadron as one of its daughters. We also show that the trigger efficiency can be obtained reliably in simulation and data-driven approaches. 
Hongyu Da, Xiangli Cui, Gene Van Buren, J. C. Dunlop, Xin Dong, Lijuan   Ruan, Anthony Timmins, Zebo Tang, Xiaolian Wang, Yi...
hep-ex