Matt McIrvin's research while affiliated with Harvard University and other places

Publications (3)

Article
Reparametrization invariance, a symmetry of heavy quark effective theory, appears in different forms in the literature. The most commonly cited forms of the reparametrization transformation are shown to induce the same constraints on operators that do not vanish under the equation of motion to order 1/m2, and to be related by a redefinition of the...
Article
The heavy quark effective field theory Lagrangian is renormalized to order 1/m^2. Our technique eliminates operators that vanish by the equation of motion by continuously redefining the heavy quark fields during renormalization. It is consequently only necessary to calculate the running of the operators that do not vanish by the equation of motion....

Citations

... To see this, note that the relation between the HPET spinor and the Dirac spinor in eq. (2.4) can be inverted [42] u ...
... Another useful feature of HQET is that loop corrections are scaleless [50], and therefore they vanish when using dim. reg. . ...
... The contribution to the coefficient C NLO−pol D from oneparticle irreducible diagrams reads The proper cancellation of these poles requires one to consider the mixing between HQE operators of different dimensionality which is known to be possible in HQET [33][34][35][36][37][38]. The anomalous dimensions of the operators are numbers independent of r while the functions of r FIG. 1. Diagrams for the contribution at NLO level, (left)-partonic type, right-power correction type with an insertion of an external gluon appearing in C D should cancel in the renormalization of the coefficient. ...