Results 51 to 60 of about 4,519 (232)
Unraveling the pattern of the XYZ mesons
Physics Letters B, 2014 We present a plausible mechanism for the origin of the XYZ mesons in the heavy meson spectra within a standard quark-model picture. We discuss the conditions required for the existence of four-quark bound states or resonances contributing to the heavy ...
J. Vijande, A. Valcarce
doaj +1 more source
Twenty new species of Hieracium sect. Tridentata and H. sect. Foliosa (Asteraceae) from Sweden
Nordic Journal of Botany, EarlyView.Nineteen new, presumably apomictic species of Hieracium sect. Tridentata, namely Hieracium anisodontum, H. bicoloriceps, H. disparifolium, H. ditrichum, H. erectifolium, H. ferox , H. lapsanae, H. luteoviride, H. megaplicatum, H. multifolium, H. paer‐haraldii, H. perpendiculum, H. phaeochlorum, H. prasiniceps, H. semirigidum, H.
Tommy Nilsson, Torbjörn Tyler
wiley +1 more source
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 +2 more
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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 +2 more
wiley +1 more source
Thermal energy of a charm-meson molecule in a pion gas
Journal of High Energy PhysicsThe 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 +3 more
doaj +1 more source
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 +4 more
wiley +1 more source
Superexotic K*+D*+K*+ bound state
Physics Letters BWe study a system made from K*+D*+K*+ with charge 3, isospin I=3/2, spin J=3, and a quark content of cd¯s¯us¯u, which make it highly exotic relative to the standard qq¯ structure of mesons.
Wen-Hao Jia +4 more
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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 +2 more
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PLANTS, PEOPLE, PLANET, EarlyView.Rising temperatures and wetter conditions in the Midcontinent of North America are influencing climate responses in trees. Dendroclimatological analyses of four exotic deciduous conifer species from Secrest Arboretum, Northeast Ohio help identify past, present and future climate‐tree interactions.
Gregory Wiles +6 more
wiley +1 more source