Simon Gritschacher, Andre H. Hoang, Ilaria Jemos, Piotr Pietrulewicz
We present an effective field theory method to determine secondary massive quark effects in jet production taking the thrust distribution for e+ e- collisions in the dijet limit as a concrete example. The method is based on the field theoretic treatment of collinear and soft mass modes which have to be separated coherently from the collinear and ultrasoft modes related to massless quarks and gluons. For thrust the structure of the conceptual setup is closely related to the production of massive gauge bosons and involves four different effective field theories to describe all possible kinematic situations. The effective field theories are patched together and allow for a continuous description of infinitely heavy to arbitrarily small masses keeping the exact mass dependence of the singular terms. The mass mode field theory method we present here is in the spirit of the variable fermion number scheme originally proposed by Aivazis, Collins, Olness and Tung and can also be applied in hadron collisions.
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http://arxiv.org/abs/1302.4743
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