3,666 research outputs found
Factorization, Power Corrections, and the Pion Form Factor
This letter is an investigation of the pion form factor utilizing recently
developed effective field theory techniques. The primary results reported are:
Both the transition and electromagnetic form factors are corrected at order
. However, these corrections only arise due to time ordered products
which are sensitive to soft components of the pion. The usual higher twist wave
function corrections contribute only at order , when the quark
mass vanishes. In the case of the electromagnetic form factor the
power correction is enhanced by a power of relative to the
leading order result of Brodsky and Lepage, if the scale is
non-perturbative. This enhanced correction could explain the discrepancy with
the data.Comment: Published, extended, versio
Comment on "The Phenomenology of a Nonstandard Higgs Boson in W_L W_L Scattering"
We show that in Composite Higgs models, the coupling of the Higgs resonance
to a pair of bosons is weaker than the corresponding Standard Model
coupling, provided the Higgs arises from electroweak doublets only. This is
partly due to the effects of the nonlinear realization of the chiral symmetries
at the compositeness scale.Comment: 6 pages, BU-HEP 94-2
The possibility of use of solar energy in the southeastern part of Western Siberia
The article presents the results of a study of the regime of solar radiation in the southeastern part of Western Siberia. To characterize the regime of solar radiation, long-term observational data on actinometrical and meteorological stations were used. The dependence of the total annual global radiation on latitude received. The dependence of the sunshine duration on latitude it gives. The potential amount of total solar radiation per year under average conditions cloud cover and atmospheric transparency considered. Common regularities of solar radiation arriving to the slopes of varying steepness and exposure can be distinguished in mountainous areas. On the basis of the potential arriving of the total solar radiation in the southern part of Western Siberia we can distinguish three latitude zones
Unparticle physics at hadron collider via dilepton production
The scale invariant unparticle physics recently proposed by Georgi could
manifest at low energies as non integral number d_U of invisible particles.
Unparticles if existing, could couple to the Standard Model fields and
consequently affect the collider phenomenology. We consider the DY process to
explore effects of the peculiar propagator of the scalar and tensor unparticle
operators. To probe these effects at hadron collider one needs to go beyond LO
in QCD and hence the quantitative impact of QCD corrections for unparticle
physics at LHC is investigated. We present the K-factors at LHC. Inclusion of
QCD corrections to NLO stabilises the cross section with respect to scale
variations.Comment: 11 pages, 9 figures, version to appear in Phys. Lett.
QCD Mass Inequalities in the Heavy Quark Limit
QCD inequalities are derived for the masses of mesons and baryons containing
a single heavy quark using the heavy quark effective field theory. A rigorous
lower bound is obtained for the parameters of the heavy quark
effective theory that parameterize corrections, > 237 MeV
for mesons, and MeV for baryons. The inequalities on
imply the inequalities MeV and MeV for
the mass parameters of the heavy quark effective field theory.Comment: 10 pages, 0 figures, uses harvma
Polysemy in Design Review Conversations
This paper examines the role of polysemy, defined as the quality of having multiple meanings, in design review conversations. It examines the polysemy, particularly of nouns, involved in a dataset of design review conversations with reference to design ideas. The purpose is to determine whether polysemy is related to successful development of design ideas and more creative design outcomes. The results show that the polysemy of nouns involved in the conversations of the finally developed, successful, design ideas exceeds in the most cases the average polysemy involved in the conversations pertaining to the unsuccessful design ideas. Furthermore, the polysemy of these nouns is linked to high overall creativity of the design idea. The paper concludes by discussing issues and directions for further investigation of polysem
Baryons Containing a Heavy Quark as Solitons
The possibility of interpreting baryons containing a single heavy quark as
bound states of solitons (that arise in the nonlinear sigma model) and heavy
mesons is explored. Particular attention is paid to the parity of the bound
states and to the role of heavy quark symmetry.Comment: 15 pages, uses phyzzx.tex and tables.tex, REVISED VERSION: Some of
the results have changed because of a crucial minus sign, CALT-68-1783 and
UCSD/PTH 92-1
Renormalization of initial conditions and the trans-Planckian problem of inflation
Understanding how a field theory propagates the information contained in a
given initial state is essential for quantifying the sensitivity of the cosmic
microwave background to physics above the Hubble scale during inflation. Here
we examine the renormalization of a scalar theory with nontrivial initial
conditions in the simpler setting of flat space. The renormalization of the
bulk theory proceeds exactly as for the standard vacuum state. However, the
short distance features of the initial conditions can introduce new divergences
which are confined to the surface on which the initial conditions are imposed.
We show how the addition of boundary counterterms removes these divergences and
induces a renormalization group flow in the space of initial conditions.Comment: 22 pages, 4 eps figures, uses RevTe
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