186,734 research outputs found
KLOE RESULTS ON LIGHT MESON SPECTROSCOPY
No full textAn important part of the program of the KLOE experiment has been dedicated to the study of the φ radiative decays into scalar (f0(980) and a0(980)) and pseudoscalar (η and η′) mesons
The neutron electromagnetic form factors in the time-like region
No full textThe final results of the FENICE experiment on the first measurement of the neutron time-like form factors are presented. Results on the proton time-like form factors and on the multihadronic cross-section are also reported. Finally a first proposal by the FENICE Collaboration to perform a new measurement of the neutron form factors is briefly discussed
Radiative Phi decays at KLOE
No full textWe describe the status of the analyses in progress on light meson spectroscopy in the KLOE
experiment. We present the analyses of f decays into f0 980
g and a0 980
g , the study of the
Dalitz plot of the h
p
p
p 0 and h
3p 0 decays, the measurement of the branching ratio of
h
p 0gg , and the measurement of the ratio Brf
h
g
Brf
hg
. All the presented results
are based on a sample of about 450 pb
1 of integrated luminosity collected during the 2001-2002
data taking. From the 2004-2005 data taking a factor 5 improvement in the integrated luminosity
is expected
KLOE results on light meson spectroscopy and prospects for KLOE-2
No full textThe results obtained by the KLOE Collaboration on light meson spectroscopy are presented. The radiative decay φ→ηγ have been used to study several η decay channels. The Dalitz plot distributions of the η→3π decays, both in charged and neutral final states have been measured. The box anomaly contribution in η→π + π -γ has been investigated in, and the rare decays η→π 0γγ, η→π +π -e +e - and η→e +e -e +e - have been measured. Also the strategy for the measurement of the transition form factor of φ→ηe +e - is described. The radiateve process φ→η′γ has been used to study the η′→ ηππ decay channels, obtaining a measurement of the pseudoscalar mixing angle, and finding an evidence for a gluonium content of η′. The decays φ→PPγ where P means a pseudoscalar meson, have been exploited to investigate the light scalar mesons, f 0(980), a 0(980), and σ(600). plings of the scalar mesons to KK̄, ππ or ππ 0, and to the φ resonance have been measured. The prospects for the new KLOE-2 data-taking just started at the upgraded DAΦNE with an upgraded detector are described
Comments on “Ion beam sputter deposition of YBa2Cu3O7−δ thin films” [J. Mater. Res. 8, 3032 (1993)]
No full textIn this brief letter Gauzzi & Pavuna (GP) comment on several statements published recently in the Journal of Materials Research by their former co-workers Kellett & James (KJ) in the paper entitled “Ion beam sputter deposition of YBa2Cu3O7-δ thin films”. GP conclude that the KJ paper may be misleading to other workers. The present state of art for ion beam sputtering of cuprates is not the multitarget codeposition, but rather a simple, single target sputtering as reported in detail in Physica vol.182C no.3, p.57 1991, and Physica vol.185-9 p.2563 1991. In reply KJ thank GP for bringing their (GP) comments to their attention. KJ hope that this encourages further discussion and systematic evaluation of the somewhat hitherto underrated technique of YBCO thin film deposition by ion beam sputteringLPRXNational Licence
A description of the ratio between electric and magnetic proton form factors by using space-like, time-like data and dispersion relations
No full textWe define and use a dispersive technique, based on data, analyticity and dispersion relations to handle the
nucleon form factors.
We use the available information on the ratio between the electric and magnetic proton form factors, coming
from recent space-like and time-like data and theory, as inputs in a dispersive approach that gives as outcome a
complex description of this ratio, valid in the whole q
2 plane.
The possibility of extending this definition outside the data regions allows us to make predictions about the
time-like polarizations, the asymptotic behaviour and the presence of zeros for the ratio
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
- …
