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Physics Department Current Events

Monday, July 27, 2015
Special Seminar
2:30 pm to 3:30 pm, Marshak Science Building Room 417

Thomas Mehen
Associate Professor, Duke University

"Production of Heavy Mesons and Quarkonia within Jets at the LHC"


Despite decades of study, the underlying mechanism for quarkonium production at high transverse momentum at hadron colliders is not well understood. After reviewing the status of non-relativisitic quantum chromodynamics (NRQCD), I describe new observables that involve the measurement of quarkonia within jets that are sensitive to the underlying quarkonium production mechanisms. For example, the distribution for the fraction of energy carried by a quarkonium within a jet is calculable in terms of NRQCD fragmentation functions and the dependence of this distribution on the energy of the jet and the quarkonium energy fraction can be used to perform an independent extraction NRQCD long-distance matrix elements. We derive factorized and resummed cross sections for jets with both heavy mesons and quarkonia and compare these with Monte Carlo. We also derive a boost invariant soft function that is necessary for jet cross sections at the LHC.

Thomas Mehen

Thomas Mehen, Associate Professor, Duke University