4,432 research outputs found
Photoproduction of W Bosons at HERA: Reweighting Method for implementing QCD Corrections in Monte Carlo Programs
A procedure of implementing QCD corrections in Monte Carlo programs by a
reweighting method is described for the photoproduction of W bosons at HERA.
Tables for W boson production in LO and NLO are given in bins of the transverse
momentum of the W boson and its rapidity.Comment: 39 pages, latex, 5 figure
Photoproduction of W Bosons at HERA: QCD Corrections
W bosons can be produced in the channels e+- p -> W+- + X at HERA thus
allowing to probe for anomalous trilinear couplings among the gauge bosons. We
discuss the NLO QCD corrections to the photoproduction of W bosons with finite
transverse momentum at HERA. The higher-order QCD corrections reduce the
factorization scale dependence significantly and modify the leading order cross
sections by +-O(10%).Comment: 15 pages, latex, 9 figures, published versio
Local fluctuations of vibrational polaritons monitored by two-dimensional infrared spectroscopy
We study the collective behavior of molecules placed in an infrared (IR)
microcavity, incorporating the local fluctuations, i.e., dynamical disorder.
The cooperative feature in vibrational polaritons is shown to be dynamically
eroded, due to intermolecule coherence. To further resolve such process, we
develop a two-dimensional infrared spectroscopy (2D-IR) for molecules
interacting with cavity modes. The cooperative feature in correspondence to the
spectroscopic signal is specified. The results reveal the dark states by the
cross peaks apart from the ones for polaritons, as a result of the breakdown of
cooperativity between molecules. We further show that the breakdown of
cooperativity profoundly connects to the localization of the vibrational
excitations whereas the polariton modes are extended wave over several
molecules. Besides, our work offers new physical insight for understanding the
recent 2D-IR experiments where the interaction between dark modes and bright
polaritons was evident.Comment: 11 pages, 6 figure
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