The impact of a laser field on the process of photon radiation by an ultra-relativistic electron in an atomic field is investigated. The angular distribution and the spectrum of the radiated photon ...are derived. By means of the quasiclassical approximation, the obtained results are exact in the parameters of the laser field and the atomic field. It is shown that the impact of the laser field is significant even for fairly average values of the laser field parameters routinely achievable nowadays. Therefore, an experimental observation of the influence of the laser field on bremsstrahlung in the atomic field is a very feasible task.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
It is shown that an account for the final-state interaction of real or virtual nucleon and antinucleon produced in the processes J/ψ→pp¯γ, ψ(2S)→pp¯γ, J/ψ→pp¯ω, and J/ψ→3(π+π−)γ near the threshold of ...NN¯ pair production allows one to obtain self-consistent description of these processes. Predictions of our model are in good agreement with experimental data available. The proposed potential model also reproduces the corresponding partial cross sections of pp¯ scattering.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Parameterization of the form factors of f1(1285) meson is proposed. This parameterization is consistent with the available experimental data on the cross sections of f1(1285) meson production in the ...processes e+e−→f1(1285) and e+e−→e+e−f1(1285), as well as on the widths of the decays f1(1285)→e+e−, f1(1285)→ρ0γ, f1(1285)→ρ0π+π−, and f1(1285)→2π+2π−. Our parameterization is also consistent with the predictions for the asymptotic behavior of these form factors.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
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7.
Charge asymmetry in decays B →DD¯K Bondar, A. E.; Milstein, A. I.
The journal of high energy physics,
12/2020, Volume:
2020, Issue:
12
Journal Article
Peer reviewed
Open access
A
bstract
We discusses the charge asymmetry in
B →
D
D
¯
K
decays with an invariant mass of the
D
D
¯
pair near the Ψ(3770) resonance. Unlike Ψ(3770) decays in
e
+
e
−
annihilation, in
B
+
decays the ...probability of
D
0
D
¯
0
production is almost three times higher than
D
+
D
−
. In
B
0
decays, the ratio of these probabilities will be opposite. The effect is explained by the fact that, in
B
-meson decays, the
D
D
¯
pair is produced in a superposition of isoscalar and isovector states, and only in combination with
K
-mesons the total state has 1
/
2 isospin. We present a simple model in which the interference of the nonresonant isovector amplitude with the resonant isoscalar amplitude explains the experimental data.
We consider the electron-positron pair production by a photon in Coulomb field near threshold. We obtain the analytical results for the particle energy spectrum and angular distribution exactly in ...the parameter Ze2/ħv. We show that Furry-Sommerfeld-Maue approximation for the wave functions used by Nishina, Tomonaga and Sakata in Ref. 1 is not sufficient and leads to wrong results.
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It is shown that the influence of the undulator field on the motion of a relativistic electron leads to a significant increase of the bremsstrahlung cross section on an atom near the end of the ...spectrum of undulator radiation. Observation of this effect is quite a realistic task.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
The effects of parity violation in the interaction of relativistic polarized protons with
and
nuclei are discussed. Within the Glauber approach, estimates are obtained for
P
-odd asymmetries in the ...total and elastic scattering cross sections, the dissociation cross section, and in the inelastic scattering cross section with meson production. Our calculations show that asymmetry should be most noticeable in the elastic cross section and in the dissociation cross section.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, SIK, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
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