15 research outputs found
Unified description of BaBar and Belle data on the bottomonia decays Upsilon(mS) -> Upsilon(nS) pi+ pi-
We present a unified analysis of the decays of bottomonia Upsilon(mS) ->
Upsilon(nS) pi pi (m>n, m=2,3,4,5, n=1,2,3), charmonia J/psi -> phi (pi pi, K
antiK), psi(2S) -> J/psi pi pi and the isoscalar S-wave processes pi pi -> pi
pi, K antiK, eta eta. In this analysis we extend our recent study of low-lying
(m=2,3) radial excitations of bottomonia to modes involving higher (m=4,5)
excited states. Similarly as for the data on lower radial excitations, we
confirm that the data for higher radially excited states from the BaBar and
Belle collaborations can be described under conditions that the final
bottomonium is a spectator and the multichannel pi pi scattering is considered
in a model-independent approach based on analyticity, unitarity and the
uniformization procedure. Indeed we show that the dipion mass distributions in
the two-pion transitions of both charmonia and bottomonia states are explained
by a unified mechanism based on the contribution of the pi pi and K antiK
coupled channels including their interference (final-state interactions).
Therefore, our main result is that the lower and higher radially excited states
of charmonia and bottomonia have no specific features in mutual comparison and
can be understood in a unified picture, e.g. proposed by our approach.Comment: 8 page
Review of Ronnie Littlejohn, Jeffrey Dippmann (eds). Riding the Wind with Liezi: New Perspectives on the Daoist Classic
The effect of isoscalar S-wave multichannel pi pi -> pi pi, K antiK, eta eta scattering is considered in the analysis of decay data of the Upsilon-mesons. We show that when allowing for the final state interaction contribution to the decays Upsilon(mS) -> Upsilon(nS) pi pi (m>n, m=2,3, n=1,2) in our model-independent approach, we can explain the two-pion energetic spectra of these Upsilon transitions including the two-humped shape of the di-pion mass distribution in Upsilon(3S) -> Upsilon(1S) pi pi as the coupled-channel effect. It is shown also that the considered bottomia decay data do not offer new insights into the nature of the f0 mesons, which were not already deduced in our previous analyses of pseudoscalar meson scattering data.The effect of isoscalar S-wave multichannel ππ→ππ,KK¯,ηη scattering is considered in the analysis of decay data of the ϒ-mesons. We show that when allowing for the final state interaction contribution to the decays ϒ(mS)→ϒ(nS)ππ (m>n,m=2,3,n=1,2) in our model-independent approach, we can explain the two-pion energetic spectra of these ϒ transitions including the two-humped shape of the di-pion mass distribution in ϒ(3S)→ϒ(1S)ππ as the coupled-channel effect. It is shown also that the considered bottomia decay data do not offer new insights into the nature of the f0 mesons, which were not already deduced in our previous analyses of pseudoscalar meson scattering data.</p
The scalar mesons in multi-channel scattering and decays of the and families
The mesons are studied in a combined analysis of data on the isoscalar
S-wave processes and on decays
, , and
from the Argus, Crystal Ball, CLEO, CUSB,
DM2, Mark II, Mark III, and BES II collaborations. The method of analysis,
based on analyticity and unitarity and using an uniformization procedure, is
set forth with some details. Some spectroscopic implications from results of
the analysis are discussed.Comment: Lecture read by Yu. Surovtsev at the Helmholtz International Summer
School "Physics of Heavy Quarks and Hadrons - 2013", July 2013, Dubna, Russi
On nature of the scalar-isoscalar mesons in the uniformizing-variable method based on analyticity and unitarity
The experimental data on the processes
in the
channel have been jointly analyzed to study the status
and nature of the . The method of analysis is based on analyticity and
unitarity and uses an uniformization procedure. Some spectroscopic implications
from results of the analysis are discussed.Comment: 18 pages, 5 figures, 9 table
Parameters of scalar resonances from the combined analysis of data on processes and decays
A combined analysis of data on isoscalar S-wave processes
and on decays
from the DM2, Mark III and BESIII
collaborations is performed to study mesons. The method of analysis is
based on analyticity and unitarity and uses an uniformization procedure. In the
analysis limited only to the multi-channel -scattering data, two
possible sets of parameters of the were found: in both cases the
mass was about 700 MeV but the total width was either about 600 or 930 MeV. The
extension of the analysis using only the DM2 and Mark III data on the
decays does not allow to choose between these sets. However, the data from
BESIII on the di-pion mass distribution in the decay
clearly prefers the wider state. Spectroscopic implications from
results of the analysis are also discussed.Comment: the formalism is also described (text overlap) in arXiv:1108.3725;
new extended analysis of data; revised PRD versio
Electroproduction, photoproduction, and inverse electroproduction of pions in the first resonance region
Methods are set forth for determining the hadron electromagnetic structure in
the sub--threshold timelike region of the virtual-photon ``mass'' and
for investigating the nucleon weak structure in the spacelike region from
experimental data on the process at low energies. These
methods are formulated using the unified description of photoproduction,
electroproduction, and inverse electroproduction of pions in the first
resonance region in the framework of the dispersion-relation model and on the
basis of the model-independent properties of inverse electroproduction.
Applications of these methods are also shown.Comment: The revised published version; Revtex4, 18 pages, 6 figure
Masses and widths of scalar-isoscalar multi-channel resonances from data analysis
Peculiarities of obtaining parameters for broad multi-channel resonances from
data are discussed analyzing the experimental data on processes
in the channel in a
model-independent approach based on analyticity and unitarity and using an
uniformization procedure. We show that it is possible to obtain a good
description of the scattering data from the threshold to 1.89 GeV with
parameters of resonances cited in the PDG tables as preferred. However, in this
case, first, representation of the background is unsatisfactory;
second, the data on the coupled process are not well
described even qualitatively above 1.15 GeV when using the resonance parameters
from the only scattering analysis. The combined analysis of these
coupled processes is needed, which is carried out satisfactorily. Then both
above-indicated flaws, related to the analysis of solely the
-scattering, are cured. The most remarkable change of parameters with
respect to the values of only scattering analysis appears for the mass
of the which is now in some accordance with the Weinberg prediction
on the basis of mended symmetry and with an analysis using the large-
consistency conditions between the unitarization and resonance saturation. The
obtained -scattering length in case when we restrict to the
analysis of the scattering or consider so-called A-solution (with a
lower mass and width of meson) agrees well with prediction of chiral
perturbation theory (ChPT) and with data extracted at CERN by the NA48/2
Collaboration from the analysis of the decay and by the DIRAC
Collaboration from the measurement of the lifetime.Comment: 21 pages, 3 figures, 6 table
Existence of the -meson below 1 GeV and glueball
On the basis of a simultaneous description of the isoscalar s-wave channel of
the scattering (from the threshold up to 1.9 GeV) and of the
process (from the threshold to 1.4 GeV) in the
model-independent approach, a confirmation of the -meson at 665
MeV and an indication for the glueball nature of the state are
obtained. It is shown that the large -background, usually obtained,
combines, in reality, the influence of the left-hand branch-point and the
contribution of a very wide resonance at 665 MeV. The coupling constants
of the observed states with the and systems and lengths of
the and scattering are obtained.Comment: 13 pages, 3 figures, LaTex; submitted to Physics Letters
Unified description of BABAR and Belle data on the bottomonia decays Υ(mS)→Υ(nS)π+π-
We present a unified analysis of the decays of bottomonia Υ(mS)→Υ(nS)ππ (m>n, m=2,3,4,5, n=1,2,3), charmonia J/ψ→ϕ(ππ,KK¯), ψ(2S)→J/ψππ, and the isoscalar S-wave processes ππ→ππ,KK¯,ηη. In this analysis we extend our recent study of low-lying (m=2,3) radial excitations of bottomonia to modes involving higher (m=4,5) excited states. Similarly as for the data on lower radial excitations, we confirm that the data for higher radially excited states from the BABAR and Belle collaborations can be described under conditions that the final bottomonium is a spectator and the multichannel ππ scattering is considered in a model-independent approach based on analyticity, unitarity and the uniformization procedure. Indeed we show that the dipion mass distributions in the two-pion transitions of both charmonia and bottomonia states are explained by a unified mechanism based on the contribution of the ππ and KK¯ coupled channels including their interference (final-state interactions). Therefore, our main result is that the lower and higher radially excited states of charmonia and bottomonia have no specific features in mutual comparison and can be understood in a unified picture, e.g. proposed by our approach
Role of multichannel ππ scattering in decays of bottomia
The effect of isoscalar S-wave multichannel ππ→ππ, KK¯¯,ηη scattering is considered in the analysis of decay data of the Υ-mesons. We show that when allowing for the final state interaction contribution to the decays Υ(mS)→Υ(nS)ππ (m>n,m=2,3,n=1,2) in our model-independent approach, we can explain the two-pion energetic spectra of these Υ transitions including the two-humped shape of the di-pion mass distribution in Υ(3S)→Υ(1S)ππ as the coupled-channel effect. It is shown also that the considered bottomia decay data do not offer new insights into the nature of the f0 mesons, which were not already deduced in our previous analyses of pseudoscalar meson scattering data