Hamburg 2016 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 56: Beyond the Standard Model (Theorie)
T 56.4: Vortrag
Dienstag, 1. März 2016, 17:30–17:45, VMP8 SR 106
Unparticle physics constraints from the hydrogen atom — •Michael Florian Wondrak1,2, Piero Nicolini1,2, and Marcus Bleicher1,2 — 1Frankfurt Institute for Advanced Studies (FIAS), Frankfurt am Main, Germany — 2Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität Frankfurt am Main, Frankfurt am Main, Germany
Unparticle stuff has been proposed as an extension of the Standard Model of particle physics by including scale invariant fields. In the framework of effective field theory, it describes the low-energy limit of a so-called Banks-Zaks sector which exhibits scale invariance below an energy scale ΛU. Unparticle fields are characterized by a non-integer canonical scaling dimension dU, which leads to unusual properties like resembling a fractional number of (un)particles. The existence of unparticle stuff may be detected experimentally through the interaction with conventional matter.
After a review on the unparticle theory and the static potential due to virtual unparticle exchange, we focus on its impact on hydrogen atom energy levels. We obtain the energy shift of the ground state by using Rayleigh-Schrödinger perturbation theory and compare it with experimental data. In this way, bounds on the energy scale ΛU as a function of dU are derived.
Finally, we offer a comparison with existing constraints in literature like the lepton magnetic anomaly. For some parameter regimes, the hydrogen bound provides competitive results.