Author/Authors :
Da، نويسنده , , Hongyu and Cui، نويسنده , , Xiangli and Xu، نويسنده , , Yichun and Dong، نويسنده , , Xin and Dunlop، نويسنده , , James C. and Ruan، نويسنده , , Lijuan and Tang، نويسنده , , Zebo and Timmins، نويسنده , , Anthony and Van Buren، نويسنده , , Gene-Jack Wang، نويسنده , , Xiaolian and Xu، نويسنده , , Zhangbu Xu، نويسنده ,
Abstract :
We derive a new method to improve the statistics of identified particles at high transverse momentum ( p T ) 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 p T particles are significantly enhanced (by a factor of up to ∼ 100 for STAR) with trigger efficiency up to 20%. In addition, weak-decay V0s ( K S 0 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.
