T-2, Nuclear and Particle Physics, Astrophysics and Cosmology

Resummation of Jet Mass at Hadron Colliders

Yang-Ting Chien

The future of the LHC will be to search for hadronic, jetty, new-physics signals, which have huge QCD backgrounds. In order to distinguish a hadronic signal from its background it is important to be able to do precision calculations to make accurate theoretical predictions. Among useful hadronic observables, jet mass is one of the simplest and most important examples. I will discuss a method I helped develop for calculating the jet-mass distribution at hadron colliders using an expansion about the kinematic threshold. The exclusive jet-mass observable separates phase spaces of final state particles and introduces a multi-scale soft sector. I will discuss the issues of large log resummation in the calculation and the highest precision we achieved. I will also explain the way we estimate the effect of leading non-global logarithms.


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