Results 71 to 80 of about 152,368 (295)

Tetraquarks in the 1/N expansion and meson-meson resonances [PDF]

, 2016
Diquarks are found to have the right degrees of freedom to describe the tetraquark poles in hidden-charm to open-charm meson-meson amplitudes. Compact tetraquarks result as intermediate states in non-planar diagrams of the 1/N expansion and the ...
Maiani, Luciano, Polosa, ANTONIO DAVIDE, Riquer, Veronica   +2 more
core   +3 more sources

Bridging data gaps: Evidence‐based population assessment for an endemic amphibian of conservation concern

The Journal of Wildlife Management, EarlyView.
Plethodon welleri exhibits strong seasonal shifts in elevational activity with abundance and occupancy being linked to terrain characteristics. Despite historical habitat assumptions, P. welleri occurs in a broad range of forest types across a larger elevation gradient. Photo Credit to Maxwell Ramey.
Rosemary Ronca, Elyssa Winterton, Jon M. Davenport   +2 more
wiley   +1 more source

Equivalence of Electromagnetic Fluctuation and Nuclear (Yukawa) Forces: the π₀ Meson, its Mass and Lifetime

Substantia, 2022
It is shown how Maxwell’s equations for the electromagnetic field with Planck quantisation of allowed modes appears to provide a semiclassical account of nuclear interactions. The mesons emerge as plasmons, collective excitations in an electron positron
Barry W. Ninham, Iver Brevik, Mathias Boström   +2 more
doaj   +1 more source

Theoretical study of the γγ→meson-meson reaction [PDF]

AIP Conference Proceedings, 1998
We present a unified picture which studies simultaneously the gamma gamma-->pi^+ pi^-, pi^0 pi^0, K^+ K^-, K^0 bar{K}^0, pi^0 eta reactions up to about sqrt(s)=1.4 GeV reproducing the experimental cross sections. The present work implements in an accurate way the final state interactions of the meson-meson system, which is shown to be essential in ...
Oller, J. A., Oset, E.
openaire   +2 more sources

Response of specific leaf area to light: comparative study of a large species set

Oikos, EarlyView.
Specific leaf area (SLA) is a commonly used proxy for the leaf economy spectrum in plants, separating species with low‐cost leaves (in terms of carbon) with short lifespan and hence fast turnover from species with high‐cost and long‐lived leaves. While SLA is used mainly for interspecific comparisons, it also varies within species both ontogenetically ...
Tomáš Herben, Tomáš Koubek, Martin Weiser   +2 more
wiley   +1 more source

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

, 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, A. A. Andrianov, A. A. Andrianov, ALEPH Collab., C. A. Baker, D. E. Groom, D. Espriu, D. Gross, E. Witten, G. Ecker, G. Hooft 't, J. Bijnens, J. Bijnens, J. Bijnens, J. Donoghue, J. Gasser, J. Gasser, J. Gasser, L. J. Reinders, M. A. Shifman, M. K. Volkov, M. Knecht, M. Knecht, M. Knecht, O. A. Zaimidoroga, OPAL Collab., R. D. Peccei, R. Socolow, S. S. Afonin, S. Weinberg, T. Das, T. Minamikawa, V. A. Andrianov, W. A. Bardeen   +33 more
core   +2 more sources

Community dynamics of lignicolous lichens on standing deadwood in a 275‐year chronosequence

Oikos, EarlyView.
Dead trees provide discrete habitat patches in which patch quality changes gradually due to wood decomposition. Although in most cases these patches persist for not more than a few decades, in some ecosystems deadwood decomposition and the consequent change in habitat patch quality can be a centuries‐long process, potentially leading to dynamics of ...
Aleksi Nirhamo, Pemelyn Santos, Mariina Günther, Jari Kouki, Tuomas Aakala   +4 more
wiley   +1 more source

Thermal energy of a charm-meson molecule in a pion gas

Journal of High Energy Physics
The thermal corrections to the propagator of a loosely bound charm-meson molecule in a pion gas are calculated to next-to-leading order in the heavy-meson expansion using a zero-range effective field theory.
Eric Braaten, Li-Ping He, Kevin Ingles, Jun Jiang   +3 more
doaj   +1 more source

The light scalar mesons as tetraquarks

Physics Letters B, 2016
We present a numerical solution of the four-quark Bethe–Salpeter equation for ground-state scalar tetraquarks with JPC=0++. We find that the four-body equation dynamically generates pseudoscalar-meson poles in the Bethe–Salpeter amplitude.
Gernot Eichmann, Christian S. Fischer, Walter Heupel   +2 more
doaj   +1 more source

Understanding the effects of patch‐burn grazing management on aboveground grassland invertebrate biodiversity

Oikos, EarlyView.
Landscape heterogeneity is widely recognized as a driver of biodiversity, yet its consequences for above‐ground, foliage‐dwelling insect communities under active grassland management remain underexplored. Patch‐burn grazing (PBG), which rotates fire across patches within a grazed landscape, is designed to promote spatial and temporal heterogeneity by ...
Zachary L. T. Bunch, Meghan L. Avolio, Sally E. Koerner, Kevin R. Wilcox, Lydia H. Zeglin, Kimberly J. Komatsu   +5 more
wiley   +1 more source