Prof. Dr. Dmitri Melikhov

Joint Institute for Nuclear Research, Dubna, Moskovskaya Oblast’, Russia

Prof. Dr. Dmitri Melikhov

Joint Institute for Nuclear Research, Dubna, Moskovskaya Oblast’, Russia

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Academic Career Length

39Years (1988-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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18 May 2000 in Physical Review D

Journal Article

Weak form factors for heavy meson decays: An update

Dmitri Melikhov

B. Stech

We calculate the form factors for weak decays of

B_{(s)}

and

D_{(s)}

mesons to light pseudoscalar and vector mesons. To reveal the intimate connection between different decay modes and to be able to perform the calculations in the full physical

q^{2}

region we use a relativistic dispersion approach based on the constituent quark picture. This approach gives the form factors as relativistic double spectral representations in terms of the wave functions of the initial and final mesons. The form factors have the correct analytical properties and satisfy general requirements of nonperturbative QCD in the heavy quark limit. The disadvantages of quark models related to ill-defined effective quark masses and not precisely known meson wave functions are reduced by fitting the quark model parameters to lattice QCD results for the

\vec{B} ρ

transition form factors at large momentum transfers and to the measured total

\vec{D} {(K, K}^{*}) l ν

decay rates. This allows us to predict numerous form factors for all kinematically accessible

q^{2}

values.

1 September 2008 in The European Physical Journal C

Journal Article

B, D and K decays

G. Buchalla

T. K. Komatsubara

F. Muheim

L. Silvestrini

M. Artuso

R. Zwicky

+120

The present report documents the results of Working Group 2: B, D and K decays, of the workshop on Flavor in the Era of the LHC, held at CERN from November 2005 through March 2007. With the advent of...

1 June 1998 in Physical Review D

Journal Article

Rare exclusive semileptonic

\vec{b} s

transitions in the standard model

Dmitri Melikhov

N. Nikitin

S. Simula

We study long-distance effects in rare exclusive semileptonic decays

\vec{B} {(K, K}^{*}) (l^{+} l^{-}, ν \bar{ν})

and analyze dilepton spectra and asymmetries within the framework of the standard model. The form factors, describing the meson transition amplitudes of the effective Hamiltonian, are calculated within the lattice-constrained dispersion quark model: the form factors are given by dispersion representations through the wave functions of the initial and final mesons, and these wave functions are chosen such that the

\vec{B} K^{*}

transition form factors agree with the lattice results at large

q^{2}

. We calculate branching ratios of semileptonic

\vec{B} {K, K}^{*}

transition modes and study the sensitivity of observables to the long-distance contributions. The shape of the forward-backward asymmetry and the longitudinal lepton polarization asymmetry are found to be independent of the long-distance effects and mainly determined by the values of the Wilson coefficients in the standard model.

1 March 1996 in Physical Review D

Journal Article

Form factors of meson decays in the relativistic constituent quark model

Dmitri Melikhov

A formalism for the relativistic description of hadron decays within the constituent quark model is presented. First, hadron amplitudes of the light-cone constituent quark model, in particular, the weak transition form factors at spacelike momentum transfers, are represented in the form of dispersion integrals over the hadron mass. Second, the form factors at timelike momentum transfers are obtained by performing the analytic continuation from the region

q^{2}

≤0. As a result, the transition form factors both in the scattering and the decay regions are expressed through light-cone wave functions of the initial and final hadrons. The technique is applied to the description of the semileptonic decays of pseudoscalar mesons and direct calculation of the transition form factors at

q^{2}

≳0. Meson properties in the heavy quark limit are investigated. © 1996 The American Physical Society.

17 December 2004 in Physical Review D

Journal Article

Rare radiative leptonic decays

B_{d, s} \to ℓ^{+} ℓ^{-} γ

Dmitri Melikhov

Nikolai Nikitin

Long-distance QCD effects in

B_{d, s} \to ℓ^{+} ℓ^{-} γ

decays are analyzed. We show that the contribution of the light vector-meson resonances related to the virtual photon emission from valence quarks of the

B

-meson, which was not considered in previous analyses, strongly influences the dilepton differential distribution. Taking into account photon emission from the

b

-quark loop, weak annihilation, and Bremsstrahlung from leptons in the final state, we give predictions for dilepton spectrum in

B_{d, s} \to ℓ^{+} ℓ^{-} γ

decays within the Standard Model.

26 March 2018 in Physical Review D

Journal Article

Rare FCNC radiative leptonic

B_{s, d} \to γ l^{+} l^{-}

decays in the standard model

Anastasiia Kozachuk

Dmitri Melikhov

Nikolai Nikitin

We revisit rare radiative leptonic decays

B_{s, d} \to γ e^{+} e^{-}

and

B_{s, d} \to γ μ^{+} μ^{-}

in the standard model and provide the updated estimates for various differential distributions (the branching ratios, the forward-backward asymmetry, and

R_{μ / e}

, the ratio of the differential distribution for muons over electrons in the final state). The new ingredients of this work compared to the existing theoretical analyses are the following: (i) we calculate all

B_{d} \to γ

and

B_{s} \to γ

form factors induced by the vector, axial-vector, tensor and pseudotensor quark currents within the relativistic dispersion approach based on the constituent quark picture; (ii) we perform a detailed analysis of the charm-loop contributions to radiative leptonic decays: we obtain constraints imposed by electromagnetic gauge invariance and discuss the existing ambiguities in the charmonia contributions.

About Me

• ACADEMIC DEGREES: 2002 Privatdozent, Habilitation and Venia Legendi at Heidelberg University, Germany ; 2002 Doctor of Physical-Mathematical Sciences (Dr.Sc.), M. V. Lomonosov Moscow State University, Moscow, Russia; 1991 Candidate of Physical-Mathematical Sciences (Ph.D.), State Committee for Standards, Moscow, Russia. • EDUCATION: 1977-1983 M.V.Lomonosov Moscow State University, Faculty of Physics, Diploma with distinction, Moscow, Russia • EMPLOYMENT: 2022-present, Leading Scientist, BLTP, JINR, Dubna, Russia 2005-present, Associated Researcher, Particle Physics, Faculty of Physics, University of Vienna, Vienna, Austria 1993-present, Leading Scientist, Institute of Nuclear Physics, Moscow State University, Moscow, Russia; 2005-2019 Scientist, HEPHY, Austrian Academy of Scences, Vienna, Austria; 1999-2004 Alexander von Humboldt Fellow, Institute of Theoretical Physics, Heidelberg University, Germany; 1998-1999 Researcher, University Paris Sud XI, Orsay, France; 1990-1993 Scientist, Nuclear Safety Institute, Russian Academy of Sciences, Moscow, Russia ; 1983-1990 Scientist, State Committee for Standards, Moscow, Russia

Prof. Dr. Dmitri Melikhov

Prof. Dr. Dmitri Melikhov

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About Me