1,895 research outputs found
Final-state interaction phase difference in and decays
It is shown that the study of the interference pattern in the
decay provides the evidence
for the large (nearly ) relative phase between the one-photon and the
three-gluon decay amplitudes.Comment: 5 pages, revtex, \tightenlines, a version published in Phys. Rev. D
61, 117504 (2000
The Mass Splitting Problem
It is discussed the problem of the mass splitting. It is
suggested to use the decay to measure the
mass splitting.Comment: 7 pages, revtex, a few typos fixed, to be published in Pis'ma v
ZHETF, V. 69, No 1, pp. 8-11, 10 January 199
Proposed Search for Mixing in Polarization Phenomena
The and meson mass difference induces the mixing of the
and resonances, the amplitude of which, between the
and thresholds, is large in magnitude, of the order of , and possesses the
phase sharply varying by about 90. We suggest performing the polarized
target experiments on the reaction at high energy in
which the fact of the existence of mixing can be
unambiguously and very easily established through the presence of a strong jump
in the azimuthal asymmetry of the wave production cross section
near the thresholds. The presented estimates of the polarization
effect to be expected in experiment are to a great extent model independent.Comment: RevTeX, 9 pages, 1 figure. A number of typographical and grammatical
errors correcte
Light Scalar Mesons as Manifestation of Spontaneously Broken Chiral Symmetry
Attention is paid to the production mechanisms of light scalars that reveal
their nature. We reveal the chiral shielding of the \sigma(600) meson. We show
that the kaon loop mechanism of the \phi radiative decays, ratified by
experiment, points to the four-quark nature of light scalars. We show also that
the light scalars are produced in the two photon collisions via four-quark
transitions in contrast to the classic P wave tensor q\bar q mesons that are
produced via two-quark transitions . The history of
spontaneous breaking of symmetry in quantum physics is discussed in Appendix.Comment: Talk at The International Bogolyubov Conference "Problems of
Theoretical and Mathematical Physics" devoted to the 100th anniversary of
N.N.Bogolyubov's birth that was held from August 21 to August 22,2009 in
Moscow at the Russian Academy of Sciences (RAS) and from August 23 to August
27, 2009 in Dubna at the Joint Institute for Nuclear Research (JINR
Role of a_1(1260) resonance in multipion decays of light vector mesons
The contribution of the a_1(1260) meson to the amplitudes of the decays
rho(770) to 4 pi, omega(782) to 5 pi, and phi(1020) to 5 pi is analyzed in the
chiral model of pseudoscalar, vector, and axial vector mesons based on the
generalized hidden local symmetry added with the anomalous terms. The analysis
shows that inclusion of a_1 meson in the intermediate states results in
enhancement of the branching ratios of the above decays by the factor ranging
from 1.3 to 1.9 depending on the mass of a_1 meson ranging from 1.23 GeV to
m_{a_1}=m_rho sqrt{2}=1.09 GeV, the greater factor standing in case of lower
mass of the a_1.Comment: 14 pages, 5 figure
Are the reactions a challenge for the factorized Pomeron at high energies?
We would like to point to the strong violation of the putative factorized
Pomeron exchange model in the reactions in the
high-energy region where this model works fairly well in all other cases.Comment: 4 pages, LaTex, 1 fig. in postscript, minor typos corrected, to be
published in Phys. Rev. D 60, 117503 (1999
Isoscalar resonances with J^{PC}=1^{--} in e^+e^-annihilation
The analysis of the vector isoscalar excitations in the energy range between
1 and 2 GeV of the annihilation is presented for the final states
, , , and
. The effects of both the resonance mixing and the
successive opening of multiparticle channels, with the energy dependent partial
widths, are taken into account. The work extends our previous analysis
hep-ph/9609216 of the vector isovector excitations and is aimed to compare the
existing data with the predictions of the model. It is shown that
this hypothesis does not contradict the data.Comment: 16 pages, revtex, 6 ps figures. Clarifying remarks, a table, and
references are added. Accepted in Phys. Rev.
Once more about gauge invariance in \phi\to\gamma\pi0\pi0
It is argued that the realization of gauge invariance condition as a
consequent of cancellation between the \phi\to\gamma f0\to\gamma\pi0\pi0
resonance contribution and a \phi\to\gamma\pi0\pi0 background one, suggested in
Ref. [1], is misleading.Comment: 4 pages, one reference adde
Search for the scalar and mesons in the reactions
It is shown that the reactions give a good
chance for observing scalar and mesons. In the photon energy region
less then 100 MeV the vector meson contributions are negligible in comparison with the scalar
mesons for
greater than
. Using two-channel treatment of the
scattering the predictions for
are derived. The four quark model, the model of molecule and
the model of scalar and mesons are discussed.Comment: 31 pages, 10 ps files of figures, minor numerical changes, Appendix
corrected, to be published in Phys.Rev.
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