1,068,418 research outputs found
Corrections
A correction to the Fall 1991 issue of PPR
Corrections
List of corrections to the Fall 1991 issue of Performance Practice Review
Electroweak Corrections
The test of the electroweak corrections has played a major role in providing
evidence for the gauge and the Higgs sectors of the Standard Model. At the same
time the consideration of the electroweak corrections has given significant
indirect information on the masses of the top and the Higgs boson before their
discoveries and important orientation/constraints on the searches for new
physics, still highly valuable in the present situation.The progression of
these contributions is reviewed.Comment: 14 pages, 3 figures, a contribution to "The Standard Theory up to the
Higgs discovery - 60 years of CERN
Disrupting the one-loop renormalization group invariant M/alpha in supersymmetry
It is well known that in low energy supersymmetry the ratio of the gaugino
mass to the gauge coupling squared, M/alpha, is renormalization group invariant
to one-loop. We present a systematic analysis of the corrections to this ratio,
including standard two-loop corrections from gauge and Yukawa couplings,
corrections due to an additional U(1)' gaugino, threshold corrections,
superoblique corrections, corrections due to extra matter, GUT and Planck scale
corrections, and ``corrections'' from messenger sectors with supersymmetry
breaking communicated via gauge-mediation. We show that many of these effects
induce corrections at the level of a few to tens of percent, but some could
give much larger corrections, drastically disrupting the renormalization group
extrapolation of the ratio to higher scales. Our analysis is essentially
model-independent, and therefore can be used to determine the ambiguities in
extrapolating the ratio in any given model between the weak scale and higher
scales.Comment: 43 pages, LaTeX, uses epsf.sty, axodraw.sty, 12 eps figures. Minor
typos corrected. To appear in Nucl. Phys.
Subleading contributions from instanton corrections in N = 2 supersymmetric black hole entropy
We present subleading corrections to the N=2 supersymmetric black hole
entropy. These subleading contributions correspond to instanton corrections of
the Type II string theory. In particular we consider an axion free black hole
solution of low-energy effective Type II string theory. We present a procedure
to include successively all instanton corrections. Expanding these corrections
at particular points in moduli space yields polynomial and logarithmic
instanton corrections to the classical black hole entropy. We comment on a
microscopic interpretation of these instanton corrections and find that the
logarithmic corrections correspond to subleading terms in the degeneracy of the
spectrum of an underlying quantum theory.Comment: 8 pages, Late
Newton's Law Modifications due to a Sol Manifold Extra Dimensional Space
The corrections to the gravitational potential due to a Sol extra dimensional
compact manifold, denoted as , are studied. The total spacetime is
. We compare the range of the corrections to the range of the
corrections. It is found that for small values of the radius of the extra
dimensions () the the Sol manifold corrections are large compared to
the 3-torus corrections. Also, Sol manifolds corrections can be larger,
comparable or smaller compared to the 3-torus case, for larger .Comment: Based on talk given in Recent Developments in Gravity, June 8-11,
Ioannina, Greec
Updating quasar bolometric luminosity corrections. II. Infrared bolometric corrections
We present infrared bolometric luminosity corrections derived from the
detailed spectral energy distributions of 62 bright quasars of low- to
moderate-redshift (z=0.03-1.4). At 1.5, 2, 3, 7, 12, 15, and 24 microns we
provide bolometric corrections of the mathematical forms L_iso=\zeta \lambda
L_\lambda and log(L_iso)=A+B log(\lambda L_\lambda). Bolometric corrections for
radio-loud and radio-quiet objects are consistent within 95% confidence
intervals, so we do not separate them. Bolometric luminosities estimated using
these corrections are typically smaller than those derived from some commonly
used in the literature. We investigate the possibility of a luminosity
dependent bolometric correction and find that, while the data are consistent
with such a correction, the dispersion is too large and the luminosity range
too small to warrant such a detailed interpretation. Bolometric corrections at
1.5 m are appropriate for objects with properties that fall in the range
log(L_bol)=45.4-47.3 and bolometric corrections at all other wavelengths are
appropriate for objects with properties that fall in the range
log(L_bol)=45.1-47.0.Comment: 13 pages, 4 tables, 8 figures, accepted to MNRA
ZFITTER: a semi-analytical program for fermion pair production in e+e- annihilation, from version 6.21 to version 6.42
ZFITTER is a Fortran program for the calculation of fermion pair production
and radiative corrections at high energy e+e- colliders; it is also suitable
for other applications where electroweak radiative corrections appear. ZFITTER
is based on a semi-analytical approach to the calculation of radiative
corrections in the Standard Model. We present a summary of new features of the
ZFITTER program version 6.42 compared to version 6.21. The most important
additions are: (i) some higher-order QED corrections to fermion pair
production, (ii) electroweak one-loop corrections to atomic parity violation,
(iii) electroweak one-loop corrections to nu-e nu-e-bar production, (iv)
electroweak two-loop corrections to the W boson mass and the effective weak
mixing angle.Comment: 60 pages, latex, 3 table
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