منابع مشابه
Spin-orbit Correlations and Single-spin Asymmetries
In nonrelativistic quantum mechanics, Fourier transforms of the form factors yield charge distributions in the center of mass frame. In general, the concept of a center of mass has no analog in relativistic theories, and thus the position space interpretation of form factors is frame dependent. This is different in the Infinite Momentum Frame (IMF) or light-cone framework, where a Galilean subg...
متن کاملRelativistic symmetry suppresses quark spin-orbit splitting.
Experimental data indicate small spin-orbit splittings in hadrons. For heavy-light mesons we identify a relativistic symmetry that suppresses these splittings. We suggest an experimental test in electron-positron annihilation. Furthermore, we argue that the dynamics necessary for this symmetry are possible in QCD.
متن کاملQuark correlations and single-spin asymmetries
Many hadron production reactions give rise to significant ⊥ single-spin asymmetries (SSA) which persist at high energies. For example, hyperons produced in hadronic collisions typically show a large polarization perpendicular to the production plane. More recently, the HERMES collaboration found a significant SSA (left-right asymmetry in the transverse momentum distribution of the produced meso...
متن کاملSpin-Spin Correlations of Top Quark Pairs at Hadron Colliders
Top quark pairs are produced with strongly correlated spins in the partonic reactions qq̄ → tt̄ and gg → tt̄. A complete description of these effects in terms of the spin density matrix of the tt̄ system in leading order QCD is given. We further discuss the prospects to observe the spin-spin correlations at pp̄ and pp colliders by measuring suitable angular correlations among the t and t̄ decay produ...
متن کاملElectron Correlations in Photoionization of Spin-Orbit Doublets
Measurements of absolute photoionization cross section of 3d subshell spin-orbit doublet components in Xenon 3d5/2 and 3d3/2 [1] are analyzed. Of particular interest is the observation of an additional broad maximum in the 3d5/2 cross section that lie 17.5 eV above the near threshold maximum. To understand the nature of this feature we have performed calculations of the cross sections and angul...
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ژورنال
عنوان ژورنال: International Journal of Modern Physics: Conference Series
سال: 2015
ISSN: 2010-1945,2010-1945
DOI: 10.1142/s2010194515600368