28,030 research outputs found
Two-Loop Virtual Corrections to Drell-Yan Production at order alpha_s alpha^3
The Drell-Yan mechanism for the production of lepton pairs is one of the most
basic processes for physics studies at hadron colliders. It is therefore
important to have accurate theoretical predictions. In this work we compute the
two-loop virtual mixed QCD x QED corrections to Drell-Yan production. We
evaluate the Feynman diagrams by decomposing the amplitudes into a set of known
master integrals and their coefficients, which allows us to derive an
analytical result. We also perform a detailed study of the ultraviolet and
infrared structure of the two-loop amplitude and the corresponding poles in
epsilon.Comment: 20 pages, 3 figure
Thermal Quantum Fields without Cut-offs in 1+1 Space-time Dimensions
We construct interacting quantum fields in 1+1 dimensional Minkowski space,
representing neutral scalar bosons at positive temperature. Our work is based
on prior work by Klein and Landau and Hoegh-KrohnComment: 48 page
Electrodynamic coupling of electric dipole emitters to a fluctuating mode density within a nano-cavity
We investigate the impact of rotational diffusion on the electrodynamic
coupling of fluorescent dye molecules (oscillating electric dipoles) to a
tunable planar metallic nanocavity. Fast rotational diffusion of the molecules
leads to a rapidly fluctuating mode density of the electromagnetic field along
the molecules' dipole axis, which significantly changes their coupling to the
field as compared to the opposite limit of fixed dipole orientation. We derive
a theoretical treatment of the problem and present experimental results for
rhodamine 6G molecules in cavities filled with low and high viscosity liquids.
The derived theory and presented experimental method is a powerful tool for
determining absolute quantum yield values of fluorescence.Comment: 5 pages, 3 figures, accepted by Physical Review Letter
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