35 research outputs found
Electro-Magnetic Nucleon Form Factors and their Spectral Functions in Soliton Models
It is demonstrated that in simple soliton models essential features of the
electro-magnetic nucleon form factors observed over three orders of magnitude
in momentum transfer are naturally reproduced. The analysis shows that
three basic ingredients are required: an extended object, partial coupling to
vector mesons, and relativistic recoil corrections. We use for the extended
object the standard skyrmion, one vector meson propagator for both isospin
channels, and the relativistic boost to the Breit frame. Continuation to
timelike leads to quite stable results for the spectral functions in the
regime from the 2- or 3-pion threshold to about two rho masses. Especially the
onset of the continuous part of the spectral functions at threshold can be
reliably determined and there are strong analogies to the results imposed on
dispersion theoretic approaches by the unitarity constraint.Comment: 24 pages, (RevTeX), 5 PS-figures; Data points in fig.2 and
corresponding references added. Final version, to be published in Z.Physik
Three-nucleon force effects in the analyzing powers of the (d)over-right-arrowp breakup at 130 MeV
Three-nucleon force effects in the analyzing powers of the (d)over-right-arrowp breakup at 130 MeV
Quantum Gravity in Everyday Life: General Relativity as an Effective Field Theory
This article is meant as a summary and introduction to the ideas of effective
field theory as applied to gravitational systems.
Contents:
1. Introduction
2. Effective Field Theories
3. Low-Energy Quantum Gravity
4. Explicit Quantum Calculations
5. ConclusionsComment: 56 pages, 2 figures, JHEP style, Invited review to appear in Living
Reviews of Relativit
Multi-omic data integration and analysis using systems genomics approaches: methods and applications in animal production, health and welfare
QCD sum rule study of hidden-charm pentaquarks
We study the mass spectra of hidden-charm pentaquarks having spin and quark contents . We
systematically construct all the relevant local hidden-charm pentaquark
currents, and select some of them to perform QCD sum rule analyses. We find
that the and can be identified as hidden-charm
pentaquark states composed of an anti-charmed meson and a charmed baryon.
Besides them, we also find a) the lowest-lying hidden-charm pentaquark state of
has the mass GeV, while the one of is significantly higher, that is around GeV; b) the
lowest-lying hidden-charm pentaquark state of has the mass
GeV, consistent with the of ,
while the one of is also significantly higher, that is above
GeV; c) the hidden-charm pentaquark state of has a mass
around GeV, slightly larger than the of .Comment: 18 pages, 5 figures and 3 tables. Accepted by Eur. Phys. J.