Phys. Lett. B839 (2023), 137766 We have reconsidered the results on the masses of the narrow bottomonium
states $\Upsilon(1S)$--$\Upsilon(3S)$ obtained in 1982--1986 at CESR, DORIS and
VEPP-4 ...colliders in order to fix shortcomings of the mass determination
procedures. For experiments at CESR and DORIS this includes the incorrect
accounting of the radiative corrections and usage of the electron mass value
revised in 1986. In analyses of all experiments the interference of the
resonance production and the nonresonant process was ignored. The corrected
mass values for five experiments are suggested. The corrections vary from 0.1
to 0.4~MeV. The discrepancy between CESR and \mbox{VEPP-4} results on
$\Upsilon(1S)$ mass has been reduced from 3.3 to 1.8 standard deviations.
There is one established, that glycerol’s injection in (7,0 ÷ 15,0)% of mass. amount into polymer blend of polypropylene/poly(vinyl alcohol) (PP/PVA) of mass equation 30/70% is not changing the ...structure forming character of PP into PVA matrix: there are parts, films and external shells being formed alongside with PP fibers. When at this, during concentration increase of selective plastifier, there are PP fiber forming process into PP matrix gonna being bad, and those are consisting in average microfiber diameters and mass part of films increase. There are features of structure forming, being linked in plastifying effect of glycerol on the blend melts, and, when simultaneously with, in the those decrease of kinetical stability. There are crystallization temperature of PVA increasing, simultaneously at plasticizer content of 7,0 % of mass., and there is PP crystallization peak absent through polymer amorphization. There is crystallinity’s degree of PP decreases, through high dispersion state of polymer.
We have reconsidered the results on the masses of the narrow bottomonium states \(\Upsilon(1S)\)--\(\Upsilon(3S)\) obtained in 1982--1986 at CESR, DORIS and VEPP-4 colliders in order to fix ...shortcomings of the mass determination procedures. For experiments at CESR and DORIS this includes the incorrect accounting of the radiative corrections and usage of the electron mass value revised in 1986. In analyses of all experiments the interference of the resonance production and the nonresonant process was ignored. The corrected mass values for five experiments are suggested. The corrections vary from 0.1 to 0.4~MeV. The discrepancy between CESR and \mbox{VEPP-4} results on \(\Upsilon(1S)\) mass has been reduced from 3.3 to 1.8 standard deviations.
We present the study of the decay $J/\psi \rightarrow \rho\pi$. The results
are based on of 5.2~million $J/\psi$ events collected by the KEDR detector at
the VEPP-4M collider. The branching fractions ...are measured to be $\B(J/\psi
\rightarrow \rho\pi) = \big(2.072\pm 0.017 \pm 0.062 \big)\cdot 10^{-2}$ and
$\B(J/\psi \rightarrow \pi^+\pi^-\pi^0) = \big(1.878 \pm 0.013 \pm 0.051
\big)\cdot 10^{-2}$, where the first uncertainties are statistical and the
second systematic. Our results are more precise than the previous relative
measurements.
We present the study of the decay \(J/\psi \rightarrow \rho\pi\). The results are based on of 5.2~million \(J/\psi\) events collected by the KEDR detector at the VEPP-4M collider. The branching ...fractions are measured to be \(\B(J/\psi \rightarrow \rho\pi) = \big(2.072\pm 0.017 \pm 0.062 \big)\cdot 10^{-2}\) and \(\B(J/\psi \rightarrow \pi^+\pi^-\pi^0) = \big(1.878 \pm 0.013 \pm 0.051 \big)\cdot 10^{-2}\), where the first uncertainties are statistical and the second systematic. Our results are more precise than the previous relative measurements.
The present work continues a series of the KEDR measurements of the $R$ value
that started in 2010 at the VEPP-4M $e^+e^-$ collider. By combining new data
with our previous results in this energy ...range we measured the values of
$R_{\text{uds}}$ and $R$ at nine center-of-mass energies between 3.08 and 3.72
GeV. The total accuracy is about or better than $2.6\%$ at most of energy
points with a systematic uncertainty of about $1.9\%$. Together with the
previous precise $R$ measurement at KEDR in the energy range 1.84-3.05 GeV, it
constitutes the most detailed high-precision $R$ measurement near the
charmonium production threshold.
The product of the electronic width of the $\psi(2S)$ meson and the branching
fraction of its decay to the muon pair was measured in the $e^{+}e^{-} \to
\psi(2S) \to \mu^{+}\mu^{-}$ process using ...nine data sets corresponding to an
integrated luminosity of about 6.5 pb$^{-1}$ collected with the KEDR detector
at the VEPP-4M electron-positron collider: \
\Gamma_{ee}\times\mathcal{B}_{\mu\mu} = 19.3 \pm 0.3 \pm 0.5 ~\text{eV}. \
Adding the previous KEDR results on hadronic and leptonic channels, the values
of the $\psi(2S)$ electronic width were obtained under two assumptions: either
with the assumption of lepton universality \ \Gamma_{ee} = 2.279 \pm 0.015 \pm
0.042 ~\text{keV} \ or without it, summing up hadronic and three independent
leptonic channels: \ \Gamma_{ee} = 2.282 \pm 0.015 \pm 0.042 ~\text{keV}. \
The product of the electronic width of the $J/\psi$ meson and the branching
fractions of its decay to hadrons and electrons has been measured using the
KEDR detector at the VEPP-4M $e^+e^-$ collider. ...The obtained values are:
$\Gamma_{ee}(J/\psi) = 5.550 \pm 0.056 \pm 0.089 \, \text{keV}, $
$\Gamma_{ee}(J/\psi) \cdot \mathcal{B}_\text{hadrons}(J/\psi) = 4.884 \pm 0.048
\pm 0.078 \, \text{keV}, $ $\Gamma_{ee}(J/\psi) \cdot \mathcal{B}_{ee}(J/\psi)
= 0.3331 \pm 0.0066 \pm 0.0040 \, \text{keV}.$ The uncertainties shown are
statistical and systematic, respectively. Using the result presented and the
world-average value of the electronic branching fraction, one obtains the total
width of the $J/\psi$ meson: $\Gamma = 92.94 \pm 1.83 \, \text{keV}.$ These
results are consistent with the previous experiments.
Using the KEDR detector at the VEPP-4M $e^+e^-$ collider, we have determined
the values of $R$ at thirteen points of the center-of-mass energy between 1.84
and 3.05 GeV. The achieved accuracy is ...about or better than $3.9\%$ at most of
the energy points with a systematic uncertainty less than $2.4\%$.
Phys. Lett. B 753 (2016) 533-541 Using the KEDR detector at the VEPP-4M $e^+e^-$ collider, we have measured
the values of $R_{\text{uds}}$ and $R$ at seven points of the center-of-mass
energy between ...3.12 and 3.72 GeV. The total achieved accuracy is about or
better than $3.3\%$ at most of energy points with a systematic uncertainty of
about $2.1\%$. At the moment it is the most accurate measurement of $R(s)$ in
this energy range.
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