87,806 research outputs found
Flavor Singlet Axial Coupling of the Proton - An Updated Analysis
We present a combined analysis of SESAM and TxL data for the flavor singlet
axial coupling G_A^1 of the proton, which is very helpful to stabilize the
disconnected signals at small quark masses.
From connected and disconnected contributions we use the tadpole improved
renormalization constant Z_A and obtain G_A^1=0.21(12).Comment: 3 pages, contribution to LATTICE99 (matrix elements
Study of photon detection efficiency and position resolution of BESIII electromagnetic calorimeter
We study the photon detection efficiency and position resolution of the
electromagnetic calorimeter (EMC) of the BESIII experiment. The control sample
of the initial-state-radiation (ISR) process of is used at and resonances for the EMC
calibration and photon detection efficiency study. Photon detection efficiency
is defined as the predicted photon, obtained by performing a kinematic fit with
two muon tracks, matched with real photons in the EMC. The spatial resolution
of the EMC is defined as the separation in polar () and azimuthal
() angles between charged track and associated cluster centroid on the
front face of the EMC crystals.Comment: 5 page
Technical Design Report for PANDA Electromagnetic Calorimeter (EMC)
This document presents the technical layout and the envisaged performance of the Electromagnetic Calorimeter (EMC) for the
PANDA target spectrometer. The EMC has been designed to meet the physics goals of the PANDA experiment. The performance figures are based on extensive prototype tests and radiation hardness studies. The document shows that the EMC is ready for construction up to the front-end electronics interface
Disentangling the EMC Effect
The deep inelastic scattering cross section for scattering from bound
nucleons differs from that of free nucleons.This phenomena, first discovered 30
years ago, is known as the EMC effect and is still not fully understood. Recent
analysis of world data showed that the strength of the EMC effect is linearly
correlated with the relative amount of Two-Nucleon Short Range Correlated pairs
(2N-SRC) in nuclei. The latter are pairs of nucleons whose wave functions
overlap, giving them large relative momentum and low center of mass momentum,
where high and low is relative to the Fermi momentum of the nucleus. The
observed correlation indicates that the EMC effect, like 2N-SRC pairs, is
related to high momentum nucleons in the nucleus. This paper reviews previous
studies of the EMC-SRC correlation and studies its robustness. It also presents
a planned experiment aimed at studying the origin of this EMC-SRC correlation.Comment: 8 pages, 3 figures. Proceedings of plenary talk at CIPANP 201
Investigations on electromagnetic noises and interactions in electronic architectures : a tutorial case on a mobile system
Electromagnetic interactions become critic in embedded and smart electronic structures. The increase of electronic performances confined in a finite volume or support for mobile applications defines new electromagnetic environment and compatibility configurations (EMC). With canonical demonstrators developed for tutorials and EMC experiences, this paper present basic principles and experimental techniques to investigate and control these severe interferences. Some issues are reviewed to present actual and future scientific challenges for EMC at electronic circuit level
EMC and Polarized EMC Effects in Nuclei
We determine nuclear structure functions and quark distributions for Li,
B, N and Al. For the nucleon bound state we solve the
covariant quark-diquark equations in a confining Nambu--Jona-Lasinio model,
which yields excellent results for the free nucleon structure functions. The
nucleus is described using a relativistic shell model, including mean scalar
and vector fields that couple to the quarks in the nucleon. The nuclear
structure functions are then obtained as a convolution of the structure
function of the bound nucleon with the light-cone nucleon distributions. We
find that we are readily able to reproduce the EMC effect in finite nuclei and
confirm earlier nuclear matter studies that found a large polarized EMC effect.Comment: 8 pages, 9 figure
Numerical analysis of electromagnetic cascades in emulsion chambers
A new calculational scheme of the Monte Carlo method assigned for the investigation of the development of high and extremely high energy electromagnetic cascades (EMC) in the matter was elaborated. The scheme was applied to the analysis of angular and radial distributions of EMC electrons in the atmosphere. By means of this scheme the EMC development in dense medium is investigated and some preliminary data are presented on the behavior of EMC in emulsion chambers. The results of more detailed theoretical analysis of the EMC development in emulsion chambers are discussed
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