Reparameterization Invariance to all Orders in Heavy Quark Effective Theory

Details Reparameterization Invariance to all Orders in Heavy Quark Effective Theory Reparameterization Invariance to all Orders in Heavy Quark Effective Theory

1997-04-07

arxiv.org/abs/hep-ph/9704256v2

Phys.Rev.D57:331-336,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, LaTex. Important and confusing typographical error in eq. (15) corrected. To appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.57.331

Heavy Quark Effective Theory splits a heavy quark momentum into a large fixed momentum and a variable residual momentum, p = m_Q v + k. It thereby suffers a redundancy of description corresponding to small changes in the choice of the fixed velocity, v. The fact that full QCD is manifestly v-independent should lead to a non-trivial constraint on the form of the effective theory, known as Reparameterization Invariance. For spin-1/2 quarks, the precise form of the constraint and its solution at the level of the effective lagrangian have proven to be rather subtle, and the original proposal by Luke and Manohar has been questioned. In this paper I employ a version of Heavy Quark Effective Theory containing the ``anti-particle'' field as a non-propagating auxiliary field, which greatly simplifies keeping track of v-dependence. This permits a very simple derivation of Reparameterization Invariance from first principles. The auxiliary field can also be integrated out to return to the standard formulation of the effective theory, but with the effective lagrangian now satisfying the full reparameterization constraint. I compare this result with earlier proposals.

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