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RESEARCH PRODUCT
Lattice QCD and the timelike pion form factor.
Harvey B. Meyersubject
PhysicsParticle physicsAnomalous magnetic dipole momentAnalytic continuationHigh Energy Physics - Lattice (hep-lat)Form factor (quantum field theory)FOS: Physical sciencesGeneral Physics and AstronomyOrder (ring theory)Mathematical Physics (math-ph)Lattice QCDHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)High Energy Physics - LatticePionVacuum polarizationConserved currentMathematical Physicsdescription
We present a formula that allows one to calculate the pion form factor in the timelike region 2mpi <= sqrt{s} <= 4mpi in lattice QCD. The form factor quantifies the contribution of two-pion states to the vacuum polarization. It must be known very accurately in order to reduce the theoretical uncertainty on the anomalous magnetic moment of the muon. At the same time, the formula constitutes a rare example where, in a restricted kinematic regime, the spectral function of a conserved current can be determined from Euclidean observables without an explicit analytic continuation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-05-15 | Physical review letters |