1,264 research outputs found
Power corrections from decoupling of the charm quark
Decoupling of heavy quarks at low energies can be described by means of an
effective theory as shown by S. Weinberg in Ref. [1]. We study the decoupling
of the charm quark by lattice simulations. We simulate a model, QCD with two
degenerate charm quarks. In this case the leading order term in the effective
theory is a pure gauge theory. The higher order terms are proportional to
inverse powers of the charm quark mass starting at . Ratios of
hadronic scales are equal to their value in the pure gauge theory up to power
corrections. We show, by precise measurements of ratios of scales defined from
the Wilson flow, that these corrections are very small and that they can be
described by a term proportional to down to masses in the region of
the charm quark mass
Chinese medicine in the West 2009
In January 1985 The Journal of Chinese Medicine published an edited transcript of a discussion called ‘Acupuncture in the West’ between Peter Deadman, Ted Kaptchuk, Giovanni Maciocia and Felicity Moir. It was a particularly popular article and to celebrate the 30th anniversary of the JCM we decided to convene another discussion, in London in March 2009. Present this time were Peter Deadman (PD), Hugh MacPherson (HM), Daniel Maxwell (DM), Felicity Moir (FM) and Volker Scheid (VS). All are past or present practitioners of acupuncture and/or herbal medicine
Cardiovascular benefits of lycopene : fantasy or reality?
Acknowledgements F. T. and S. M. are grateful for support from the Scottish Government (Rural and Environmental Science and Analytical Services). Financial Support F. T. and L. F. M. received funding from the UK Food Standard Agency for tomato and lycopene-related researchPeer reviewedPublisher PD
Enzymes of Hevea brasiliensis latex. Adenylate Kinase, Sulphate Adenylyitransferase (ATP-sulphurylase) and Thiosulphate Sulphurtransferase (Rhodanese)
Penyiasatan fasa serum dari lateks Hevea brasiliensis mendalilkan kewujudan ketiga enzim yang
beriku t: adenilat kinase EC 2.7.4.3; sulfat adenililtransferase (ATP-sulfurilase) EC 2.7.7.4; tiosulfat sulfurtransferase
(rodanese) EC 2.8.1.1
Critical States in Disordered Superconducting Films
When subject to a pair-breaking perturbation, the pairing susceptibility of a
disordered superconductor exhibits substantial long-ranged mesoscopic
fluctuations. Focusing on a thin film subject to a parallel magnetic field, it
is proposed that the quantum phase transition to the bulk superconducting
condensate may be preempted by the formation of a glass-like phase with
multi-fractal correlations of a complex order parameter. Although not
universal, we argue that such behavior may be a common feature of quantum
critical phenomena in disordered environments.Comment: 7 pages, 1 eps figur
Interaction of Laser Radiation with Plasmas and Nonadiabatic Motion of Particles in Magnetic Fields
Contains reports on three research projects.United States Atomic Energy Commission (Contract AT(30-1)-3285
Scale-invariant magnetoresistance in a cuprate superconductor
The anomalous metallic state in high-temperature superconducting cuprates is
masked by the onset of superconductivity near a quantum critical point. Use of
high magnetic fields to suppress superconductivity has enabled a detailed study
of the ground state in these systems. Yet, the direct effect of strong magnetic
fields on the metallic behavior at low temperatures is poorly understood,
especially near critical doping, . Here we report a high-field
magnetoresistance study of thin films of \LSCO cuprates in close vicinity to
critical doping, . We find that the metallic state
exposed by suppressing superconductivity is characterized by a
magnetoresistance that is linear in magnetic field up to the highest measured
fields of T. The slope of the linear-in-field resistivity is
temperature-independent at very high fields. It mirrors the magnitude and
doping evolution of the linear-in-temperature resistivity that has been
ascribed to Planckian dissipation near a quantum critical point. This
establishes true scale-invariant conductivity as the signature of the strange
metal state in the high-temperature superconducting cuprates.Comment: 10 pages, 3 figure
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