The spin structure of the nucleon

Aidala, C.; Bass, Steven D.; Hasch, D.; Mallot, G.K.

doi:10.1103/revmodphys.85.655

Cited by 448 publications

(501 citation statements)

References 306 publications

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“…Processes associated with the flavour-singlet 1 −+ channel are characterized by OZI violation. The anomalous glue that generates the large η and η ′ masses also drives OZI violating η and η ′ production and decay processes [24][25][26][27][28], enters in the η ′ -nucleon interaction [29] and the flavour-singlet Goldberger-Treiman relation [30] associated with the proton spin puzzle [31,32].…”

Section: Introductionmentioning

confidence: 99%

QCD Symmetries in $\eta $- and $\eta '$-Mesic Nuclei

Bass¹,

Thomas²

2014

Acta Phys. Pol. B

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We discuss the role of QCD symmetries and confinement in understanding η and η ′ mesic nuclei. η and η ′ bound states in nuclei are sensitive to the flavour-singlet component in the meson. The bigger the singlet component, the more attraction and the greater the binding. Recent results on the η ′ mass in nuclei from the CBELSA/TAPS collaboration are very similar to the prediction of the Quark Meson Coupling model. In the model η-η ′ mixing induces a factor of two enhancement of the η-nucleon scattering length a ηN relative to the prediction with a pure octet η with real part about 0.8 fm.

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Section: Introductionmentioning

confidence: 99%

QCD Symmetries in $\eta $- and $\eta '$-Mesic Nuclei

Bass¹,

Thomas²

2014

Acta Phys. Pol. B

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“…Since neutrinos ν have the well-known parity asymmetry of possessing only one spin direction, we reason that their wave motions must be   Corben, 1961, for an earlier struggle to make sense of "intrinsic spin," and most recently Aidala et al, 2013, for a critical re-examination of this concept).…”

Section: (Wte) = (Teb) Next Rotating the X-y Plane Around The Zmentioning

confidence: 99%

The Spinning Motions of All Fermions and Bosons as Implied by Pauli Matrices Containing Complex Conjugates in a Combined Spacetime Four-Manifold

Light¹

2013

APR

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By substituting z = a + bi and 1/z = a -bi for i and -i into one of Pauli matrices and then casting (x,y) = (0,a+bi) as (x,y,z) = (0,a,b) and (x,y) = (a-bi,0) as (x,y,z) = (a,-b,0) by the geometry of our previously formulated combined spacetime 4-manifold = {(t+ti,x+yi,y+zi,z+xi)}, this paper generalizes the Dirac equation for a free electron into an equation that gives the motion (t,x(t),y(t),z(t)) for any free fermion or boson to be a uniform circular flow around two semi-circles connected with each other by an angle equal to 0, 30, 60, 90, or 180 degrees depending on the electric charge possessed by the particle. Even purely algebraically, any fermion or boson must correspond to a number on the complex unit circle, since the Dirac equation admits a Pauli matrix of z with modulus equal to one but not necessarily equal to i and all energies in free space must satisfy this Dirac equation as derived from the universally true equation of "energy-squared minus pc-squared equal to rest-energy-squared."

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“…Surprisingly, the measurements of polarized structure functions of proton in DIS experiments [2][3][4][5] showed that the total spin carried by the constituent quarks was very small (only about 30%) leading to the "proton spin crisis" [6]. The polarized deep inelastic lepton-nucleon scattering is an useful probe of the spin structure of the nucleon and the measurements with proton, deuteron, and helium-3 targets have determined the unpolarized and polarized structure functions of the nucleon through the measurement of the longitudinal spin asymmetries with the target spin being parallel and antiparallel to the longitudinally polarized beam [3,7].…”

Section: Introductionmentioning

confidence: 99%