1,440 research outputs found
Hadronic Paschen-Back effect
We find a novel phenomenon induced by the interplay between a strong magnetic
field and finite orbital angular momenta in hadronic systems, which is
analogous to the Paschen-Back effect observed in the field of atomic physics.
This effect allows the wave functions to drastically deform. We discuss
anisotropic decay from the deformation as a possibility to measure the strength
of the magnetic field in heavy-ion collision at LHC, RHIC and SPS, which has
not experimentally been measured. As an example we investigate charmonia with a
finite orbital angular momentum in a strong magnetic field. We calculate the
mass spectra and mixing rates. To obtain anisotropic wave functions, we apply
the cylindrical Gaussian expansion method, where the Gaussian bases to expand
the wave functions have different widths along transverse and longitudinal
directions in the cylindrical coordinate.Comment: 8 pages, 8 figures, v3: updated to the published style on PL
Higher Order Hybrid Monte Carlo at Finite Temperature
The standard hybrid Monte Carlo algorithm uses the second order integrator at
the molecular dynamics step. This choice of the integrator is not always the
best. Using the Wilson fermion action, we study the performance of the hybrid
Monte Carlo algorithm for lattice QCD with higher order integrators in both
zero and finite temperature phases and find that in the finite temperature
phase the performance of the algorithm can be raised by use of the 4th order
integrator.Comment: 13 pages, 6 figure
Artificial-enzyme gel membrane-based biosurveillance sensor with high reproducibility and long-term storage stability
We propose that the most sophisticated strategy for primary biosurveillance is to exploit structural commonality through the detection of biologically relevant phosphoric substances. A novel assay, an artificial-enzyme membrane was designed and synthesized for sensor fabrication. This artificial-enzyme catalyzes the hydrolysis of the diphosphoric acid anhydride structure. This structure-selective, albeit not molecule-selective, catalytic hydrolysis was successfully coupled with amperometric detection. Since the catalytic reaction produces a dephosphorylation product (PO43−), it can be reduced by an electrode potential of −250 mV vs. Ag/AgCl. Owing to the structural selectivity of the artificial-enzyme membrane, the sensor can detect biological phosphoric substances comprehensively that have the diphosphoric acid anhydride structure. The sensor successfully determined various biological phosphoric substances at concentrations in the micromolar (µM) to millimolar (mM) range, and it showed good functional stability and reproducibility in terms of sensor responses. This sensor was used to detect Escherichia coli lysed by heat treatment, and the response increased with increasing bacterial numbers. This unique technique for analyzing molecular commonality can be applied to the surveillance of biocontaminants, e.g. microorganisms, spores and viruses. Artificial-enzyme-based detection is a novel strategy for practical biosurveillance in the front line
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