3,218 research outputs found
Transverse single-spin asymmetries in proton-proton collisions at the AFTER@LHC experiment
We present results for transverse single-spin asymmetries in proton-proton
collisions at kinematics relevant for AFTER, a proposed fixed-target experiment
at the Large Hadron Collider. These include predictions for pion, jet, and
direct photon production from analytical formulas already available in the
literature. We also discuss specific measurements that will benefit from the
higher luminosity of AFTER, which could help resolve an almost 40-year puzzle
of what causes transverse single-spin asymmetries in proton-proton collisions.Comment: 10 pages, 4 figures; more details/discussion added to the text,
references added/updated, version to appear in Advances in High Energy
Physics for the Special Issue "Physics at a Fixed-Target Experiment Using the
LHC Beams
Single-spin asymmetries in the leptoproduction of transversely polarized hyperons
We analyze single-spin asymmetries (SSAs) in the leptoproduction of
transversely polarized hyperons within the collinear twist-3
formalism. We calculate both the distribution and fragmentation terms in two
different gauges (lightcone and Feynman) and show that the results are
identical. This is the first time that the fragmentation piece has been
analyzed for transversely polarized hadron production within the collinear
twist-3 framework. In lightcone gauge we use the same techniques that were
employed in computing the analogous piece in , which
has become an important part to that reaction. With this in mind, we also
verify the gauge invariance of the formulas for the transverse SSA in the
leptoproduction of pions.Comment: 12 pages, 1 figure, reference added, version to appear in Phys. Lett.
Longitudinal-transverse double-spin asymmetries in single-inclusive leptoproduction of hadrons
We analyze the longitudinal-transverse double-spin asymmetry in
lepton-nucleon collisions where a single hadron is detected in the final state,
i.e., . This is a subleading-twist
observable in collinear factorization, and we look at twist-3 effects in both
the transversely polarized nucleon and the unpolarized outgoing hadron. Results
are anticipated for this asymmetry from both HERMES and Jefferson Lab Hall A,
and it could be measured as well at COMPASS and a future Electron-Ion Collider.
We also perform a numerical study of the distribution term, which, when
compared to upcoming experimental results, could allow one to learn about the
"worm-gear"-type function as well as assess the role of
quark-gluon-quark correlations in the initial-state nucleon and twist-3 effects
in the fragmenting unpolarized hadron.Comment: 14 pages, 7 figures, minor changes to the text, version to appear in
Phys. Lett.
Twist-2 Generalized TMDs and the Spin/Orbital Structure of the Nucleon
Generalized transverse-momentum dependent parton distributions (GTMDs) encode
the most general parton structure of hadrons. Here we focus on two twist-2
GTMDs which are denoted by and in parts of the literature.
As already shown previously, both GTMDs have a close relation to orbital
angular momentum of partons inside a hadron. However, recently even the mere
existence of and has been doubted. We explain why this
claim does not hold. We support our model-independent considerations by
calculating the two GTMDs in the scalar diquark model and in the quark-target
model, where we also explicitly check the relation to orbital angular momentum.
In addition, we compute and at large transverse momentum in
perturbative Quantum Chromodynamics and show that they are nonzero.Comment: 29 pages, 6 figures; two clarifications and a reference added;
version to appear in Phys. Rev.
Soil-Diaphragm Wall Interaction in Floating Dam
Stability of embankment dam with diaphragm cutoff wall constructed on riverbed sediment depends on structural behavior of local part around top of the wall. A numerical method to evaluate static and dynamic behavior of the part including earth pressure concentration is proposed and the validity is confirmed by comparison of numerical results of full construction process with observed ones in a prototype dam. Besides, in-situ vibration tests are performed on testing diaphragm wall constructed in dam site for banking test to reveal dynamic behavior of the wall. Furthermore, earthquake response analysis of whole structure is carried out to clarify behavior of a system of dam diaphragm wall and riverbed sediment during earthquake
Twist-3 approach to single transverse-spin asymmetry
We study the single transverse-spin asymmetry for the inclusive direct-photon and single-jet productions in the proton-proton collision based on the twist-3 mechanism in the collinear factorization. Taking into account all the effects from the twist-3 quark-gluon correlation functions inside a transversely polarized proton, we present a prediction for the asymmetries at the typical RHIC kinematics. In both processes we find sizable asymmetries in the forward region of the polarized proton while they are almost zero in the backward region. This implies that if one finds a nonzero asymmetry in the backward region in these processes, it should be ascribed wholely to the three-gluon correlations
- …