25,558 research outputs found
muSR study of the Cu-spin dynamics in the electron-doped high-Tc cuprate of Pr0.86LaCe0.14Cu1-y(Zn,Ni)yO4
Effects of the Zn- and Ni-substitution on the Cu-spin dynamics in the
electron-doped Pr0.86LaCe0.14Cu1-y(Zn,Ni)yO4+a-d with y = 0, 0.01, 0.02, 0.05
and different values of the reduced oxygen content d have been studied using
zero-field muon-spin-relaxation (muSR) measurements at temperatures down to 2
K. For the as-grown sample (d = 0, y = 0) and the sample with a very small d
value (d < 0.01, y = 0), a muon-spin precession due to long-range
antiferromagnetic order has been observed. On the other hand, no precession has
been observed for moderately oxygen-reduced samples (0.01 < d < 0.09). It has
been found that for all the samples of 0.01 < d < 0.09 the asymmetry A(t) (muSR
time spectrum) in the long-time region increases with decreasing temperature at
low temperatures, suggesting possible slowing-down of the Cu-spin fluctuations.
On the other hand, no significant difference between Zn- and Ni-substitution
effects on the slowing down of the Cu-spin fluctuations has been observed.Comment: 4 pages, 2 figures, Proceeding of 10th muSR conference 2005, to be
published in Physica
Novel Master Formula for Twist-3 Soft-Gluon-Pole Mechanism to Single Transverse-Spin Asymmetry
We prove that twist-3 soft-gluon-pole (SGP) cross section for single spin
asymmetries is determined by a certain ``primordial'' twist-2 cross section up
to kinematic and color factors in the leading order perturbative QCD. This
unveils universal structure behind the SGP cross sections in a variety of hard
processes, and also the special role of the scale invariance in the
corresponding primordial cross section, which leads to remarkable
simplification of the SGP cross sections for the production of massless
particle, such as those for pion production p^\uparrow p \to \pi X and
direct-photon production p^\uparrow p \to \gamma X.Comment: 4 pages, 4 eps figures. To appear in the proceedings of 15th
International Workshop on Deep-Inelastic Scattering and Related Subjects
(DIS2007), Munich, Germany, 16-20 Apr 200
Single Transverse-Spin Asymmetry in Large Open Charm Production at an Electron-Ion Collider
We discuss the single transverse-spin asymmetry (SSA) to be observed in the
-meson production with large transverse-momentum in semi-inclusive deep
inelastic scattering, . This contribution is
embodied as a twist-3 mechanism in the collinear factorization, which is
induced by purely gluonic correlation inside the transversely-polarized
nucleon, in particular, by the three-gluon correlation effects. The complete
formula for the corresponding SSA in the leading-order QCD is expressed in
terms of the four independent gluonic correlation functions and reveals the
five independent structures with respect to the dependence on the azimuthal
angle for the produced -meson. We present the numerical calculations of the
SSA formula at the kinematics relevant to a future Electron Ion Collider.Comment: 16 pages, 7 figure
A Cartan type identity for isoparametric hypersurfaces in symmetric spaces
In this paper, we obtain a Cartan type identity for curvature-adapted
isoparametric hypersurfaces in symmetric spaces of compact type or non-compact
type. This identity is a generalization of Cartan-D'Atri's identity for
curvature-adapted(=amenable) isoparametric hypersurfaces in rank one symmetric
spaces. Furthermore, by using the Cartan type identity, we show that certain
kind of curvature-adapted isoparametric hypersurfaces in a symmetric space of
non-compact type are principal orbits of Hermann actions.Comment: 20page
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