Results 231 to 240 of about 225,392 (278)

Record phenological responses to climate change in three sympatric penguin species. [PDF]

open access: yesJ Anim Ecol
Juarez Martinez I   +8 more
europepmc   +1 more source

Pathfinding quantum simulations of neutrinoless double-β decay. [PDF]

open access: yesNat Commun
Chernyshev IA   +12 more
europepmc   +1 more source

The quark model

Reports on Progress in Physics, 1978
The quark model is reviewed in a version which includes three colours and at least five quark flavours. Methods are discussed which are applicable to any number of flavours, provided the underlying symmetry is SU(n). The relation between quark bound states and hadron spectroscopy is discussed, and sum rules are given for baryon magnetic moments and ...
A W Hendry, D B Lichtenberg
openaire   +3 more sources

Quark-Quark Interaction and the Nonrelativistic Quark Model

Physical Review Letters, 1980
This Letter demonstrates that the nonrelativistic approximation breaks down for the lighter hadrons with the conventional $\mathrm{qq}$ one-gluon exchnage potential. This is mainly due to the Coulomb and the short-range hyperfine interactions. To overcome this difficulty, some phenomenological interactions with a long-range spin dependence are proposed.
R. K. Bhaduri, L. E. Cohler, Y. Nogami
openaire   +1 more source

Quark-lepton-symmetric model

Physical Review D, 1990
The notion that there exists a fundamental quark-lepton symmetry is proposed. To implement this symmetry, leptons (as well as quarks) are assumed to come in three "colors," i.e., the gauge group of the world is assumed to be ${\mathrm{SU}(3)}_{q}\ensuremath{\bigotimes}{\mathrm{SU}(3)}_{l}\ensuremath{\bigotimes}{\mathrm{SU}(2)}_{L}\ensuremath{\bigotimes}
, Foot, , Lew
openaire   +2 more sources

Quark models⋆

The European Physical Journal A, 2008
The scope of a relativistically covariant constituent quark model of baryons based on the BetheSalpeter equation in instantaneous approximation is illustrated by a discussion of various baryon resonance observables such as static electromagnetic moments including a novel calculational procedure form factors and helicity amplitudes, semileptonic decays ...
openaire   +2 more sources

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