Results 91 to 100 of about 186,516 (304)

Contribution of higher meson resonances to the electromagnetic $\pi$-meson mass difference [PDF]

open access: yes, 2001
Modifications of the DGMLY relation for calculation of electromagnetic $\pi$-meson mass difference based on the Chiral Symmetry Restoration phenomenon at high energies as well as the Operator Product Expansion of quark densities for vector ($\rho$) and ...
A. A. Andrianov   +33 more
core   +2 more sources

A Model of Mesons [PDF]

open access: yesviXra, 2017
Detailed models of mesons have been derived in terms of real structured particles, in order to replace the formless quark/anti-quark singularities of standard QCD theory. Pion design is related to the muonic mass, and a Yukawa potential is calculated for the hadronic field.
openaire   +1 more source

Grazing disrupts the trade‐off between silica‐ and phenol‐based plant defences along an aridity gradient in grasslands

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Silicon (Si) and phenolics are vital players in the plant kingdom, enabling plants to combat both biotic stresses, like herbivory and abiotic challenges, such as drought.
Kaicun Yan   +11 more
wiley   +1 more source

Apex predators exploit advantageous snow conditions across hunting modes

open access: yesJournal of Animal Ecology, EarlyView.
Advantageous snow conditions—in terms of snow depth and density—are among the most important features of the winter landscape for two apex predators, regardless of hunting strategy. In a warming climate, the knock‐on effects of a diminishing snowpack may reduce the hunting success of multiple large carnivore species.
Benjamin K. Sullender   +7 more
wiley   +1 more source

Confining Bond Rearrangement in the Random Center Vortex Model

open access: yes, 2016
We present static meson-meson and baryon--anti-baryon potentials in Z(2) and Z(3) random center vortex models for the infrared sector of Yang-Mills theory, i.e., hypercubic lattice models of random vortex world-surfaces.
Altarawneh, Derar   +2 more
core   +1 more source

Biocontrol by a native hemiparasite: Rapid suppression of noxious invasive plants in a field experiment

open access: yesJournal of Applied Ecology, EarlyView.
Melampyrum arvense was demonstrated as a biocontrol tool suitable for containing two harmful invasive species. After the suppression of the invaders, an additional introduction of native species by seeding or green‐hay transfer could facilitate community restoration. Abstract Alien plant invasions are a recognised threat to biodiversity.
Kateřina Knotková   +8 more
wiley   +1 more source

Radiative decays of vector and pseudoscalar nonets

open access: yesEPJ Web of Conferences, 2012
Using a counting scheme which treats the light pseudoscalar and the light vector-meson nonet on equal footing, the decays of the narrow light vector mesons into a pseudoscalar meson and a dilepton and of the η′ meson into an ɷ meson and a dielectron are ...
Lutz M.F.M., Leupold S., Terschlüsen C.
doaj   +1 more source

On Meson Masses

open access: yesFew-Body Systems, 2007
It is shown that in the framework of analytical confinement, when quark and gluon propagators are induced by an vacuum selfdual gluon field with constant strength, the masses of meson with quantum numbers $Q=J^P$ and quark constituents $m_1,~m_2$ are described with reasonable accuracy by the formula $$ M_Q(m_1,m_2)=(m_1+m_2)[1+{A_Q\over (m_1^2+1 ...
openaire   +3 more sources

Doubled density and increased resilience: Consequences of seven consecutive annual dry‐season fires to the unburned Cerrado grass layer

open access: yesJournal of Applied Ecology, EarlyView.
The Cerrado grass layer benefits from frequent fires and is resilient even to an extreme fire regime, such as seven annual burns. Recurrent mid‐dry‐season fires are not harmful to the grass layer and should be less concerning than prolonged fire‐suppression regimes, which diminish grasses' biomass, cover, diversity and functioning. Maintaining frequent
Hudson G. V. Fontenele   +3 more
wiley   +1 more source

Dilepton Spectra from Decays of Light Unflavored Mesons [PDF]

open access: yes, 1999
The invariant mass spectrum of the $e^{+}e^{-}$ and $\mu ^{+}\mu ^{-}$ pairs from decays of light unflavored mesons with masses below the $\phi (1020)$-meson mass to final states containing along with a dilepton pair one photon, one meson, and two mesons
A. Bramon   +81 more
core   +3 more sources

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