348 research outputs found
Identification of non-ordinary mesons from the dispersive connection between their poles and their Regge trajectories: the f0(500) resonance
We show how the Regge trajectory of a resonance can be obtained from its pole
in a scattering process and analytic constraints in the complex angular
momentum plane. The method is suited for resonances that dominate an elastic
scattering amplitude. In particular, from the rho(770) resonance pole in
pion-pion scattering, we obtain its linear Regge trajectory, characteristic of
ordinary quark-antiquark states. In contrast, the f0(500) pole -the sigma
meson- which dominates scalar isoscalar pion-pion scattering, yields a
non-linear trajectory with a much smaller slope at the f0(500) mass.
Conversely, imposing a linear Regge trajectory for the f0(500), with a slope of
typical size, yields an elastic amplitude at odds with the data. This provides
strong support for the non-ordinary nature of the sigma meson.Comment: 8 pages, 4 figure
Regge trajectory of the f_0(500) resonance from a dispersive connection to its pole
We report here our results on how to obtain the Regge trajectory of a
resonance from its pole in a scattering process by imposing analytic
constraints in the complex angular momentum plane. The method, suited for
resonances that dominate an elastic scattering amplitude, has been applied to
the {\rho}(770) and the f_0(500) resonances. Whereas for the former we obtain a
linear Regge trajectory, characteristic of ordinary quark-antiquark states, for
the latter we find a non-linear trajectory with a much smaller slope at the
resonance mass. This provides a strong indication of the non-ordinary nature of
the sigma meson.Comment: 4 pages, 2 figures, to appear in the proceedings of the "Seventh
International Symposium on Chiral Symmetry in Hadrons and Nuclei
Enhanced non-quark-antiquark and non-glueball Nc behavior of light scalar mesons
We show that the latest and very precise dispersive data analyses require a
large and very unnat- ural fine-tuning of the 1/Nc expansion at Nc = 3 if the
f_0(600) and K(800) light scalar mesons are to be considered predominantly
quark-antiquark states, which is not needed for light vector mesons. For this,
we use scattering observables whose 1/Nc corrections are suppressed further
than one power of 1/Nc for quark-antiquark or glueball states, thus enhancing
contributions of other nature. This is achieved without using unitarized ChPT,
but if it is used we can also show that it is not just that the coefficients of
the 1/Nc expansion are unnatural, but that the expansion itself does not even
follow the expected 1/Nc scaling of a glueball or a quark-antiquark meson.Comment: Discussion disfavoring a glueball interpretation added. Version
published in Phys. Rev.
Dispersive calculation of complex Regge trajectories for the lightest f_2 resonances and the K^∗(892)
We apply a recently developed dispersive formalism to calculate the Regge trajectories of the f_2(1270), f´_ 2(1525) and K^∗(892) mesons. Trajectories are calculated, not fitted to a family of resonances. Assuming that these resonances can be treated in the elastic approximation, the only input are the pole position and residue of a resonance. In all three cases, the predicted Regge trajectories are almost real and linear, with slopes in agreement with the universal value of order 1 GeV_(−2). We also show how these results barely change when considering more than two subtractions in the dispersive formalism
Changes in the free-energy landscape of p38α MAP kinase through its canonical activation and binding events as studied by enhanced molecular dynamics simulations
p38α is a Ser/Thr protein kinase involved in a variety of cellular processes and pathological conditions, which makes it a promising pharmacological target. Although the activity of the enzyme is highly regulated, its molecular mechanism of activation remains largely unexplained, even after decades of research. By using state-of-the-art molecular dynamics simulations, we decipher the key elements of the complex molecular mechanism refined by evolution to allow for a fine tuning of p38α kinase activity. Our study describes for the first time the molecular effects of different regulators of the enzymatic activity, and provides an integrative picture of the activation mechanism that explains the seemingly contradictory X-ray and NMR data
Determination of SU(2) Chiral Perturbation Theory low energy constants from a precise description of pion-pion scattering threshold parameters
We determine the values of the one- and two-loop low energy constants
appearing in the SU(2) Chiral Perturbation Theory calculation of pion-pion
scattering. For this we use a recent and precise sum rule determination of some
scattering lengths and slopes that appear in the effective range expansion. In
addition we provide sum rules for these coefficients up to third order in the
expansion. Our results when using only the scattering lengths and slopes of the
S, P, D and F waves are consistent with previous determinations, but seem to
require higher order contributions if they are to accommodate the third order
coefficients of the effective range expansion.Comment: 16 pages. Version published in Phys. Rev. D. Enlarged discussions in
several sections, appendices and many references added. Results and
conclusions unchange
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