629,380 research outputs found
Strange form factors of the nucleon in a two-component model
The strange form factors of the nucleon are studied in a two-component model
consisting of a three-quark intrinsic structure surrounded by a meson cloud. A
comparison with the available experimental world data from the SAMPLE, PVA4,
HAPPEX and G0 collaborations shows a good overall agreement. The strange
magnetic moment is found to be positive, 0.315 nm.Comment: 11 pages, 2 tables, 5 figures, accepted for publication in J. Phys.
G. Revised version, new figures, extra table, new results, updated reference
Extracting nucleon strange and anapole form factors from world data
The complete world set of parity violating electron scattering data up to
Q^2~0.3 GeV^2 is analysed. We extract the current experimental determination of
the strange electric and magnetic form factors of the proton, as well as the
weak axial form factors of the proton and neutron, at Q^2 = 0.1 GeV^2. Within
experimental uncertainties, we find that the strange form factors are
consistent with zero, as are the anapole contributions to the axial form
factors. Nevertheless, the correlation between the strange and anapole
contributions suggest that there is only a small probability that these form
factors all vanish simultaneously.Comment: 4 pages, 3 figs; v2: version to appear in PR
Strange Assemblage
This paper contends that the power of Deleuze & Guattariâs (1988) notion of assemblage as theorised in 1000 Plateaus can be normalised and reductive with reference to its application to any social-cultural context where an open system of dynamic and fluid elements are located. Rather than determining the assemblage in this way, this paper argues for an alternative conception of âstrange assemblageâ that must be deliberately and consciously created through rigorous and focused intellectual, creative and philosophical work around what makes assemblages singular. The paper will proceed with examples of âstrange assemblageâ taken from a film by Peter Greenaway (A Zed and 2 Noughts); the film âPerformanceâ; educational research with Sudanese families in Australia; the book, Bomb Culture by Jeff Nuttall (1970); and the band Hawkwind. Fittingly, these elements are themselves chosen to demonstrate the concept of âstrange assemblageâ, and how it can be presented. How exactly the elements of a âstrange assemblageâ come together and work in the world is unknown until they are specifically elaborated and created âin the momentâ. Such spontaneous methodology reminds us of the 1960s âHappeningsâ, the Situationist International and Dada/Surrealism. The difference that will be opened up by this paper is that all elements of this âstrange assemblageâ cohere in terms of a rendering of âthe unacceptable.'
Phase Space Reconstruction from Economic Time Series Data: Improving Models of Complex Real-World Dynamic Systems
Failure of economic models to anticipate the global financial crisis illustrates the need for modeling to better capture complex real-world dynamics. Conventional modelsâin which economic variables evolve toward equilibria or fluctuate about equilibria in response to exogenous random shocksâare ill-equipped to portray complex real-world dynamics in which economic variables may cycle aperiodically along low-dimensional âstrange attractorsâ. We present a method developed in the physics literatureââphase space reconstructionââthat reconstructs strange attractors present in real-world dynamical systems using time series data on a single variable. Phase space reconstruction provides pictures of real-world dynamics that can guide model specificationphase space reconstruction, time series data, economic dynamics, Agribusiness, Agricultural and Food Policy, Food Consumption/Nutrition/Food Safety, Food Security and Poverty, Production Economics, Risk and Uncertainty,
Flavor content of nucleon form factors in a VMD approach
The strange form factors of the nucleon are studied in a two-component model
consisting of a three-quark intrinsic structure surrounded by a meson cloud. A
comparison with the available experimental world data from the SAMPLE, PVA4,
HAPPEX and G0 collaborations shows a good overall agreement. It is shown that
the strangeness contribution to the electric and magnetic form factors is of
the order of a few percent. In particular, the strange quark contribution to
the charge radius is small (0.005 fm**2) and to the magnetic moment it is
positive (0.315 n.m.).Comment: 5 pages, 6 figures, 1 table, invited talk at PAVI06, Milos, Greece,
May 16-20, 200
New analysis concerning the strange quark polarization puzzle
The fact that analyses of semi-inclusive deep inelastic scattering suggest
that the polarized strange quark density is
positive in the measured region of Bjorken x, whereas all analyses of inclusive
deep inelastic scattering yield significantly negative values of this quantity,
is known as the "strange quark polarization puzzle". We have analyzed the world
data on inclusive deep inelastic scattering, including the COMPASS 2010 proton
data on the spin asymmetries, and for the first time, the new extremely precise
JLab CLAS data on the proton and deuteron spin structure functions. Despite
allowing in our parametrization, for a possible sign change, our results
confirm that the inclusive data yield significantly negative values for the
polarized strange quark density.Comment: 8 pages, 3 figures, 3 tables; misprints for the values of
in page 5 correcte
NuTeV Anomaly & Strange-Antistrange Asymmetry
The NuTeV Collaboration reported a value of measured in
neutrino-nucleon deep inelastic scattering, and found that the value is three
standard deviations from the world average value of other electroweak
measurements. If this result cannot be explained within conventional physics,
it must imply some novel physics beyond the standard model. We report the
correction from the asymmetric strange-antistrange sea by using both the
light-cone baryon-meson fluctuation model and the chiral quark model, and show
that a significant part of the NuTeV anomaly can be explained by the
strange-antistrange asymmetry.Comment: 4 pages, 2 figures. Talk at ICHEP04, August 16-22, 2004, Beijing,
Chin
Gothic Cordelias: The Afterlife of Lear and the Construction of Femininity
Addresses the gap for an analysis of Shakespeare\u27s relation to the Gothic.
The Gothic novel transports you to a strange and fascinating world quite unlike your own, far away from the calm drawing rooms of Regency England. It is the ultimate escapist literature. It is this world, and its mutually beneficial relationship with Catholicism, that Dr Maria Purves so beautifully illuminates for the reader
The CFL phase and m_s: An effective field theory approach
We study the phase diagram of dense quark matter with an emphasis on the role
of the strange quark mass. Our approach is based on two effective field
theories (EFTs). The first is an EFT that describes quark quasi-particles near
the Fermi surface. This EFT is valid at energies small compared to the chemical
potential. The second is an EFT for the Goldstone modes in the paired phase. We
find that in response to a non-zero strange quark mass the CFL phase first
undergoes a transition to a kaon condensed phase, and then to a gapless phase
with a non-zero Goldstone boson current.Comment: 26 pages, to appear in ``Pairing in fermionic systems: Basic concepts
and modern applications", Series on Advances in Quantum Many-Body Theory,
Vol. 8, World Scientific Publishing, Singapor
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