scholarly journals The sigma-meson exchange contribution to the muonic hydrogen Lamb shift

2019 ◽  
Vol 212 ◽  
pp. 07003 ◽  
Author(s):  
A.E. Dorokhov ◽  
A.P. Martynenko ◽  
F.A. Martynenko ◽  
A.E. Radzhabov
Keyword(s):  
Experimental Data ◽  
Lamb Shift ◽  
Scalar Meson ◽  
Muonic Hydrogen ◽  
Meson Exchange ◽  
Exchange Contribution ◽  
Meson Coupling ◽  
Decay Widths ◽  
Precise Experimental Data ◽  
Sigma Meson

The sigma(ξ)meson exchange contribution to the potential of the muon-proton interactionin muonichydrogen inducedbythe ξ-meson coupling to two photons is estimated. The transition form factor ξ → γγ is deduced from the quark model and experimental data on the decay widths Γσγγ. It is shown that scalar meson exchange contribution to the Lamb shift in muonic hydrogen, △ELs(2P−2S ),is rather large and relevant for a comparison with coming precise experimental data.

scholarly journals Hadronic contribution of light by light scattering in the energy spectrum of muonic hydrogen

2019 ◽  
Vol 204 ◽  
pp. 05008 ◽  
Author(s):  
A. E. Dorokhov ◽  
A. P. Martynenko ◽  
F. A. Martynenko ◽  
A. E. Radzhabov
Keyword(s):  
Experimental Data ◽  
Scalar Meson ◽  
Muonic Hydrogen ◽  
Meson Exchange ◽  
Exchange Contribution ◽  
Photon State ◽  
Two Photon ◽  
Meson Coupling ◽  
Precise Experimental Data ◽  
Gamma S

The contribution from scalar meson (S) exchange to the potential of the muon-proton interaction in muonic hydrogen induced by the scalar meson coupling to the two photon state is calculated. An estimate of transition form factor S → γγ is given on the basis of the quark model and experimental data on the decay widths $${\Gamma _{S\gamma \gamma }}$$. It is shown that scalar meson exchange contribution to the Lamb shift in muonic hydrogen ∆ELs(2P – 2S) is large and important for a comparison with precise experimental data.

scholarly journals Effects of light-by-light scattering in the Lamb shift and hyperfine structure of muonic hydrogen

2019 ◽  
Vol 222 ◽  
pp. 03010 ◽  
Author(s):  
A. E. Dorokhov ◽  
A. P. Martynenko ◽  
F. A. Martynenko ◽  
A. E. Radzhabov
Keyword(s):  
Experimental Data ◽  
Form Factor ◽  
Lamb Shift ◽  
Axial Vector ◽  
Muonic Hydrogen ◽  
Meson Exchange ◽  
Interaction Operator ◽  
Two Photon ◽  
Meson Coupling ◽  
Precise Experimental Data

We calculate the meson exchange contribution to the interaction operator of muon and proton, which is determined by the meson coupling with two photon state. For the construction of transition form factor Meson → γγ we use the existing parametrizations based on experimental data including the monopole parametrization over photon four-momenta. For an estimate of the form factor value atzero photon four-momenta squared we use experimental data on the decay width ΓMeson→γγ. It is shown that scalar, pseudoscalar, axial vector and tensor mesons exchanges give significant contribution to the Lamb shift (LS) and hyperfine splitting (HFS) in muonic hydrogen which should be taken into account for a comparison with precise experimental data.

The Contribution of the Sigma-Meson to the Lamb Shift of Muonic Hydrogen

2019 ◽  
Vol 16 (5) ◽  
pp. 520-523 ◽  
Author(s):  
A. E. Dorokhov ◽  
A. P. Martynenko ◽  
F. A. Martynenko ◽  
A. E. Radzhabov
Keyword(s):  
Lamb Shift ◽  
Muonic Hydrogen ◽  
Sigma Meson

scholarly journals Scalar meson exchange and the baryon spectra

2000 ◽  
pp. 261-265
Author(s):  
P. Stassart ◽  
Fl. Stancu ◽  
J.-M. Richard
Keyword(s):  
Scalar Meson ◽  
Meson Exchange ◽  
Baryon Spectra

Determination of hyperon properties through the variational method considering the hyperfine interaction

2019 ◽  
Vol 28 (10) ◽  
pp. 1950087 ◽  
Author(s):  
S. M. Moosavi Nejad ◽  
A. Armat
Keyword(s):  
Experimental Data ◽  
Wave Function ◽  
Ground State ◽  
Radiative Decay ◽  
Magnetic Moments ◽  
Wave Functions ◽  
Decay Widths ◽  
Free Parameters ◽  
Theoretical Results

Performing a fit procedure on the hyperon masses, we first determine the free parameters in the Cornell-like hypercentral potential between the constituent quarks of hyperons in their ground state. To this end, using the variational principle, we apply the hyperspherical Hamiltonian including the Cornell-like hypercentral potential and the perturbation potentials due to the spin–spin, spin–isospin and isospin–isospin interactions between constituent quarks. In the following, we compute the hyperon magnetic moments as well as radiative decay widths of spin-3/2 hyperons using the spin-flavor wave function of hyperons. Our analysis shows acceptable consistencies between theoretical results and available experimental data. This leads to reliable wave functions for hyperons at their ground state.

scholarly journals ANALYSIS OF THE $B_q\to D_q(D_q^*)P$ AND $B_q\to D_q(D_q^*)V$ DECAYS WITHIN THE FACTORIZATION APPROACH IN QCD

2009 ◽  
Vol 24 (31) ◽  
pp. 5845-5860 ◽  
Author(s):  
K. AZIZI ◽  
R. KHOSRAVI ◽  
F. FALAHATI
Keyword(s):  
Experimental Data ◽  
Perturbative Qcd ◽  
Sum Rules ◽  
Branching Fraction ◽  
Form Factors ◽  
Transition Form ◽  
Qcd Sum Rules ◽  
Factorization Approach ◽  
Electroweak Penguin ◽  
Decay Widths

Using the factorization approach and considering the contributions of the current–current, QCD penguin and electroweak penguin operators at the leading approximation, the decay amplitudes and decay widths of [Formula: see text] and [Formula: see text] transitions, where q = u, d, s and P and V are pseudoscalar and vector mesons, are calculated in terms of the transition form factors of the Bq→Dq and [Formula: see text]. Having computed those form factors in three-point QCD sum rules, the branching fraction for these decays are also evaluated. A comparison of our results with the predictions of the perturbative QCD as well as the existing experimental data is presented.

scholarly journals Hadronic deuteron polarizability contribution to the Lamb shift in muonic deuterium

2016 ◽  
Vol 31 (18) ◽  
pp. 1650104 ◽  
Author(s):  
A. V. Eskin ◽  
R. N. Faustov ◽  
A. P. Martynenko ◽  
F. A. Martynenko
Keyword(s):  
Experimental Data ◽  
Lamb Shift ◽  
Structure Functions ◽  
Deuteron Scattering ◽  
Isobar Model ◽  
Polarizability Contribution

Hadronic deuteron polarizability correction to the Lamb shift of muonic deuterium is calculated on the basis of unitary isobar model and modern experimental data on the structure functions of deep inelastic lepton–deuteron scattering and their parametrizations in the resonance and nonresonance regions.

scholarly journals MODEL-INDEPENDENT ESTIMATES FOR THE ABELIAN Z′ BOSON AT MODERN HADRON COLLIDERS

2011 ◽  
Vol 26 (23) ◽  
pp. 4083-4100 ◽  
Author(s):  
ALEXEY GULOV ◽  
ANDREY KOZHUSHKO
Keyword(s):  
Experimental Data ◽  
Z Boson ◽  
Hadron Colliders ◽  
Present Experimental Data ◽  
Decay Widths ◽  
Model Independent

The model-independent constraints on the Abelian Z′ couplings from the LEP data are applied to estimate the Z′ production in experiments at the Tevatron and LHC. The Z′ total and partial decay widths are analyzed. The results are compared with model-dependent predictions and present experimental data from the Tevatron. If we assume the 1–2σ hints from the LEP data to be a signal of the Abelian Z′ boson, then the Tevatron data constrain the Z′ mass between 400 GeV and 1.2 TeV.

scholarly journals KAON PHOTOPRODUCTION ON THE NUCLEON WITH CONSTRAINED PARAMETERS

2009 ◽  
Vol 24 (11n13) ◽  
pp. 964-967
Author(s):  
R. NELSON ◽  
T. MART
Keyword(s):  
Experimental Data ◽  
Particle Data Group ◽  
Resonance Decay ◽  
Decay Widths ◽  
Data Group

The new experimental data of kaon photoproduction on the nucleon γp → K+Λ have been analyzed by means of a multipoles model. Different from the previous models, in this analysis the resonance decay widths are constrained to the values given by the Particle Data Group (PDG). The result indicates that constraining these parameters to the PDG values could dramatically change the conclusion of the important resonances in this reaction found in the previous studies.

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