Title: Precision Jet Physics for pp and ep Collisions
Abstract: Understanding the physics of jets is important for many analyses at the LHC. Two examples are i) channels with a fixed number of jets used in Higgs analyses and searches for new physics, and ii) the exploration of jet substructure to distinguish boosted heavy objects or quark vs. gluon initiated jets. Jets also play an important role in ep collisions, where final state jets are used to measure alphas(mZ) and constrain parton distributions. Using new technology, next-to-next-to-leading log (NNLL) predictions have recently become available for many jet observables, pushing precision phenomenology into a new regime. I will use NNLL jet mass distributions for the LHC to explore the dependence on jet kinematics, jet size, and partonic channels, and will use NNLL predictions for 2-jets in DIS to explore the sensitivity to measuring the transverse momentum distribution of initial state radiation from the proton. At this precision power corrections beyond those in the parton distributions also become relevant, and the question of whether they can be described by universal parameters will be discussed. Interestingly the answer to this question depends on how hadron masses are treated in the experimental measurements.