Results 31 to 40 of about 4,598 (182)

Two-index SU(N) theories from one flavor QCD to Steven Weinberg's ππ scattering legacy

Nuclear Physics B
I review and improve on how two-index SU(N) gauge-fermion theories help access salient information about the large N vacuum and spectrum of QCD, super Yang Mills and meson-meson scattering.
Francesco Sannino
doaj   +1 more source

Macroecological relationships of ant diversity with increasing aridity in Australian tropical savannas: contrasting responses of epigaeic and hypogaeic assemblages

Ecography, EarlyView.
Studies using climatic gradients play a key role in our understanding of the importance of rainfall and temperature as factors regulating species diversity and distribution, and thus of likely responses to climate change. However, such studies currently consider above‐ground species only, ignoring the diverse hypogaeic (subterranean) invertebrate fauna.
François Brassard, Giovanny Destour, Tristan Klaftenberger, Alan N. Andersen   +3 more
wiley   +1 more source

Mass and width of $$T_{c\bar{c}}(4020)$$ T c c ¯ ( 4020 ) in the developed Bethe–Salpeter theory

European Physical Journal C: Particles and Fields
In experiments exotic meson resonance $$T_{c\bar{c}}(4020)$$ T c c ¯ ( 4020 ) lies above the $$D^{*}\bar{D}^{*}$$ D ∗ D ¯ ∗ threshold, and in principle one can not explain $$T_{c\bar{c}}(4020)$$ T c c ¯ ( 4020 ) as a meson-meson bound state because meson-
Xiaozhao Chen, Xiaofu Lü, Xiurong Guo, Zonghua Shi   +3 more
doaj   +1 more source

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

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

Climate change effects on biomass and greenhouse gas emissions are ameliorated by nontoxic endophytes in southeastern USA transition zone tall fescue pastures

Grassland Research, EarlyView.
Tall fescue produces more biomass and less carbon dioxide from the soil when it contains its beneficial fungal endophyte. Increased temperatures projected with climate change reduce fescue biomass, while altered rainfall frequency does not. Altering rainfall frequency and increasing temperatures can reduce carbon dioxide emissions from soil.
Rebecca K. McGrail, Jonathan D. Moore, A. Elizabeth Carlisle, Jim A. Nelson, Rebecca L. McCulley   +4 more
wiley   +1 more source

Independent leaf and root responses to autumn freezing in perennial herbs: Insights from cutting and transplant manipulations

Grassland Research, EarlyView.
In this study, we compared two sampling approaches to assess autumn freezing resistance. Our goal was to determine whether the commonly employed cutting method, which disrupts root‐tissue connectivity, provides a valid measure of true freezing resistance.
Zhengjie Yan, Cheng Chen, Xin Jing, Shuai Ren, Junpeng Rui, Tao Wang, Jin‐Sheng He   +6 more
wiley   +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

Breeding switchgrass for reduced nitrogen demand

Grassland Research, EarlyView.
Breeding has improved switchgrass biomass yield, but productivity is still heavily dependent on nitrogen fertilizer application. The genetic diversity needed to improve nitrogen use efficiency of switchgrass remains underused, mainly because of the slow and laborious breeding process, thus leaving the crop's high nitrogen demand as a major barrier to ...
Michael D. Casler, Prabin Bajgain
wiley   +1 more source