PKU HEP Seminar and Workshop (北京大学高能物理组)
Testing NRQCD with Quarkonium Produced in Jets at the LHC
by
→
Asia/Shanghai
B105 (CHEP)
B105
CHEP
West Building, School of Physics, PKU
Description
This talk will describe new tests of quarkonium production using quarkonia that are produced within jets. We study the distribution in the fraction z of a jet's longitudinal momentum carried by the quarkonium. The z distribution is sensitive to the underlying NRQCD production mechanism. Analytic calculations the z distributions in SCET that incorporate Next-to-Leading-Log (NLL) resummation disagree with default PYTHIA predictions. We describe a modified simulation method which agrees well with NLL analytic calculations. This method is then successfully applied to recent LHCb measurements of J/psi within jets. We discuss the implications of this measurement for extractions of NRQCD long-distance matrix elements.
Finally, we discuss other observables involving quarkonium within jets which may be useful for discriminating between NRQCD production mechanisms.