2,601 research outputs found
Structure functions in polarized proton-deuteron Drell-Yan processes
Polarized proton-deuteron (pd) Drell-Yan processes are investigated for
studying new spin structure of a spin-1 hadron. Our formalism indicates that
there exist many structure functions: 108 in general and 22 in the \vec
Q_T-integrated case. A naive parton model suggests that at least one of them
should be related to the tensor polarized distributions, which have not been
measured at all. There are some experimental possibilities at FNAL, HERA, and
RHIC to study the polarized pd reactions.Comment: 1+3 pages, LaTeX, espcrc2.sty. Talk at the 7th international workshop
on Deep Inelastic Scattering and QCD, Zeuthen, Germany, April 19-23, 1999. To
be published in Nucl. Phys. B. Complete postscript file is available at
http://www2.cc.saga-u.ac.jp/saga-u/riko/physics/quantum1/structure.html
Email: [email protected]
Proton-deuteron asymmetry in Drell-Yan processes and polarized light-antiquark distributions
We discuss the relation between the ratio of the proton-deuteron (pd)
Drell-Yan cross section to the proton-proton (pp) one \Delta_{(T)}
\sigma_{pd}/2 \Delta_{(T)} \sigma_{pp} and the flavor asymmetry in polarized
light-antiquark distributions. Using a recent formalism of the polarized pd
Drell-Yan process, we show that the difference between the pp and pd cross
sections is valuable for finding not only the flavor asymmetry in
longitudinally polarized antiquark distributions but also the one in
transversity distributions. It is especially important that we point out the
possibility of measuring the flavor asymmetry in the transversity distributions
because it cannot be found in W production processes and inclusive lepton
scattering due to the chiral-odd property.Comment: 10 pages, LATEX2e with epsfig.sty, 4 eps figures. Complete postscript
file including the figures is available at http://www-hs.phys.saga-u.ac.jp .
Email: [email protected], [email protected]
Upper estimate of martingale dimension for self-similar fractals
We study upper estimates of the martingale dimension of diffusion
processes associated with strong local Dirichlet forms. By applying a general
strategy to self-similar Dirichlet forms on self-similar fractals, we prove
that for natural diffusions on post-critically finite self-similar sets
and that is dominated by the spectral dimension for the Brownian motion
on Sierpinski carpets.Comment: 49 pages, 7 figures; minor revision with adding a referenc
Surface and Depth Profile Analyses by the Ion Induced Light Emission
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Thomas-Ehrman shifts in nuclei around ^{16}O and role of residual nuclear interaction
The asymmetry in the energy spectra between mirror nuclei (the Thomas-Ehrman
shifts) around O is investigated from a phenomenological viewpoint. The
recent data on proton-rich nuclei indicates that the residual nuclear
interaction is reduced for the loosely bound s-orbit by as much as 30%, which
originates in the broad radial distribution of the proton single-particle wave
function.Comment: to appear in Phys. Lett. B, with 3 eps figure
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