Powered by Indico
v3.1.1
Heavy quarks, such as charm and beauty quarks, produced in the early stage in heavy-ion collisions, are considered as golden probes to study transport properties and understand the microscopic structure of quark-gluon plasma. Experimentally, fully reconstructed open heavy flavor hadrons spectra are measured to understand heavy quark energy loss and hadronization mechanisms with the presence of quark-gluon plasma medium. In this seminar, I will present the application of machine learning techniques along with multivariate approach for heavy flavor physics measurements in heavy-ion collisions. The production cross section of fully reconstructed B+ and B0s mesons via decay channels of B+→J/ψ K+→μ+ μ− K+ and B0s→J/ψ φ→μ+ μ− K+ K− in PbPb collisions with the CMS experiment will be reported. The first observation of B0s with greater than 5σ significance in nuclear collisions is achieved in this analysis. In addition, we have observed the signals of fully reconstructed B mesons down to 0 transverse momentum, allowing the potential precise measurement of inclusive beauty production cross section in pp collisions. Complementary to the CMS results, the physics simulations of charm and beauty hadrons with sPHENIX at RHIC and the analysis results from sPHENIX Mock Data Challenge 1 will be also shown. I will also present the characterization on the sPHENIX electromagnetic calorimeter, which will provide electron identification capabilities for fully reconstructed b-hadron analysis. Finally, the GEANT 4 simulation results of shashlik electromagnetic calorimeters design for the future Electron-Ion Collider will be discussed.