183 research outputs found
Perturbative renormalization factors for generic four-quark operators in domain-wall QCD with improved gauge action
We calculate one-loop renormalization factors of generic DeltaS=2 four-quark
operators for domain-wall QCD with the plaquette gauge action and the Iwasaki
gauge action. The renormalization factors are presented in the modified minimal
subtraction (MS-bar) scheme with the naive dimensional regularization. As an
important application we show how to construct the renormalization factors for
the operators contributing to K^0-K^0bar mixing in the supersymmetric models
with the use of our results.Comment: 22 pages,uses revtex
Precise determination of and light quark masses in quenched domain-wall QCD
We calculate non-perturbative renormalization factors at hadronic scale for
four-quark operators in quenched domain-wall QCD using the
Schr\"{o}dinger functional method. Combining them with the non-perturbative
renormalization group running by the Alpha collaboration, our result yields the
fully non-perturbative renormalization factor, which converts the lattice bare
to the renormalization group invariant (RGI) . Applying this
to the bare previously obtained by the CP-PACS collaboration at
GeV, we obtain (equivalent to
by 2-loop running)
in the continuum limit, where the first error is statistical and the second is
systematic due to the continuum extrapolation. Except the quenching error, the
total error we have achieved is less than 2%, which is much smaller than the
previous ones. Taking the same procedure, we obtain MeV and MeV (equivalent to
MeV and MeV by 4-loop running) in the continuum limit.Comment: 51 pages, 27 Postscript figures, corrected typos, added referenc
Pre-DECIGO can get the smoking gun to decide the astrophysical or cosmological origin of GW150914-like binary black holes
Pre-DECIGO consists of three spacecraft arranged in an equilateral triangle
with 100km arm lengths orbiting 2000km above the surface of the earth. It is
hoped that the launch date will be in the late 2020s.
Pre-DECIGO has one clear target: binary black holes (BBHs) like GW150914 and
GW151226. Pre-DECIGO can detect BBH mergers up to
redshift . The cumulative event rate is in the Pop III origin model of BBHs like GW150914, and it
saturates at , while in the primordial BBH (PBBH) model, the
cumulative event rate is at
even if only of the dark matter consists of PBHs, and it is
still increasing at . In the Pop I/II model of BBHs, the cumulative event
rate is and it saturates at . We present the requirements on orbit accuracy, drag free techniques, laser
power, frequency stability, and interferometer test mass. For BBHs like
GW150914 at 1Gpc, SNR is achieved with the definition of Pre-DECIGO in
the Hz band. Pre-DECIGO can measure the mass spectrum and the
-dependence of the merger rate to distinguish various models of BBHs like
GW150914.
Pre-DECIGO can also predict the direction of BBHs at with an accuracy
of and a merging time accuracy of s at about a
day before the merger so that ground-based GW detectors further developed at
that time as well as electromagnetic follow-up observations can prepare for the
detection of merger in advance. For intermediate mass BBHs at a large redshift
, the QNM frequency after the merger can be within the Pre-DECIGO band
so that the ringing tail can also be detectable to confirm the Einstein theory
of general relativity with SNR.
[abridged]Comment: 17 pages, 10 figures, added some references, modifications to match
the published version in PTE
Laparoscopic Partial Hepatectomy: Animal Experiments
As a first step in firmly establishing laparoscopic hepatectomy, we introduce a porcine model of laparoscopic partial hepatectomy. This procedure has been successfully performed under the normal-pressure or low-pressure pneumoperitoneum condition supported by the full-thickness abdominal wall lifting technique. An ultrasonic dissector combined with electrocautery, newly developed by Olympus Optical Corporation (Japan) was effectively utilized in facilitating safe and smooth incisions into the liver parenchyma. Although indications for this procedure seem to be limited only to peripheral lesions and not to central lesions, clinical application of this method may be useful for some patients in the near future
Portable Electrochemical Gas Sensing System with a Paper-Based Enzyme Electrode
An unconventional portable electrochemical gas sensor composed of a smartphone, a finger-sized sensing chip and a single use paper-based enzyme electrode was proposed to detect a particular target gaseous inclusion for self-breath-analysis with ease. This attempt allowed us to monitor our physical status immediately and continuously regardless of a time, place or person due to the improved convenience, immediacy, and affordability. The custom CMOS chip with the capability of performing an amperometric determination when the power voltage supplied from the earphone jack of a smartphone was designed as an analytical device. A disposable enzyme electrode was prepared simply from a chromatography paper and a commercial carbon pencil instead of the conventional indisposable material and complex manufacturing process. The quantification of ethanol in gaseous samples was demonstrated in range from 50 to 500ppm (V/V) in accord with concentrations in exhaled breath. The response current increased linearly with increasing vapor ethanol concentration
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