Long-range electron spin-spin interactions from unparticle exchange.
Yi Liao,Ji-Yuan Liu +1 more
TLDR
The precisely measured long-ranged spin-spin interaction of electrons is used to constrain unparticle couplings to the electron, and bounds for other ranges of d exceed or are complementary to those obtained previously from exotic positronium decays.Abstract:
Unparticles as suggested by Georgi are identities that are not constrained by dispersion relations but are governed by their scaling dimension d. Their coupling to particles can result in macroscopic interactions between matter that are generally an inverse nonintegral power of distance. This is totally different from known macroscopic forces. We use the precisely measured long-ranged spin-spin interaction of electrons to constrain unparticle couplings to the electron. For 1<d<1.5 the axial vector unparticle coupling is excluded, and for 1<d<1.3 the pseudoscalar and vector couplings are also ruled out. These bounds and the ones for other ranges of d exceed or are complementary to those obtained previously from exotic positronium decays.read more
Citations
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Search for New Physics with Atoms and Molecules
Marianna Safronova,Dmitry Budker,David DeMille,Derek F. Jackson Kimball,Andrei Derevianko,Charles W. Clark +5 more
TL;DR: In this article, the authors present a review of the application of atomic physics to address important challenges in physics and to look for variations in the fundamental constants, search for interactions beyond the standard model of particle physics and test the principles of general relativity.
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Unparticle physics effects in B s - B ¯ s mixing
TL;DR: In this paper, the authors investigate unparticle effects in mixing and discuss the possibility of reproducing the experimental result of the mixing phase, while having large effects on mixing phase.
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Using the Earth as a polarized electron source to search for long-range spin-spin interactions.
TL;DR: Using recent deep-Earth geophysics and geochemistry results, a comprehensive map of electron polarization within the Earth induced by the geomagnetic field is created and bounds on torsion gravity and possible long-range spin-spin forces associated with the virtual exchange of either spin-one axial bosons or unparticles are established.
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Unparticles-Higgs Interplay
TL;DR: In this paper, it was shown that scalar unparticles coupled to the Standard Model Higgs at the renormalizable level can have a dramatic impact in the breaking of the electroweak symmetry already at tree level.
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Unparticles at heavy flavour scales: CP violating phenomena
TL;DR: In this paper, the authors investigated the effect of scale invariant unparticle sector asymmetries in the leptonic decay and the hadronic decay on heavy flavor physics and showed that the asymmetry can be very large even for small couplings.
References
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Unparticle Physics
TL;DR: In this article, the authors discuss some simple aspects of the low-energy physics of a nontrivial scale invariant sector of an effective field theory and argue that it is important to take seriously the possibility that the unparticle stuff described by such a theory might actually exist in our world.
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Another odd thing about unparticle physics
TL;DR: In this article, the peculiar propagator of scale invariant unparticles has phases that produce unusual patterns of interference with standard model processes, and they illustrate some of these effects in e + e − → μ + μ −.
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Collider Signals of Unparticle Physics
TL;DR: Phenomenology of the notion of an unparticle U, recently perceived by Georgi, to describe a scale invariant sector with a nontrivial infrared fixed point at a higher energy scale is explored in details.
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Spin-dependent macroscopic forces from new particle exchange
Bogdan A. Dobrescu,Irina Mocioiu +1 more
TL;DR: In this article, the long-range potential between two fermions assuming rotational invariance is parametrized, and 16 different components are found, including spin-dependent static components as well as spin and velocity-dependent components.