379 citations · 2.7k across the 167 of their papers we have counts for
8 papers · 2 filters
Compact Flavour-Exotic Tetraquarks in Large- QCD - To Be or Not to Be?
Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian
We analyse exotic tetraquark mesons - bound states formed by two quarks and two antiquarks - for the specific case of four different quark flavours within the framework of a well-d…
Strong Isospin Breaking in the Decay Constants of Heavy-Light Mesons from Local-Duality QCD Sum Rules
Wolfgang Lucha, Dmitri Melikhov, Silvano Simula
We explore, by a rather peculiar limit of QCD sum rules subject to a Borel transformation (realized by allowing the related Borel mass parameter to approach infinity), how the smal…
Are there narrow flavor-exotic tetraquarks in large- QCD?
Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian
A salient feature shared by all tetraquark candidates observed in experiment is the absence of flavor-exotic states of the type , with four different quark flavor…
Strong Isospin Breaking in Heavy-Meson Decay Constants: Employing Borelized QCD Sum Rules in Local-Duality Limit
Wolfgang Lucha, Dmitri Melikhov, Silvano Simula
Applying the QCD sum-rule machinery in the so-called local-duality shape to heavy-light mesons reveals that, as a consequence of the non-zero mass gap between up and down quarks, t…
Exotic Tetraquark Mesons in Large- Limit: an Unexpected Great Surprise
Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian
Two-ordinary-meson scattering in large- QCD implies consistency criteria for intermediate-tetraquark contributions. Their fulfilment at -leading order constrains the natu…
Long-distance QCD effects in FCNC decays
Anastasiia Kozachuk, Dmitri Melikhov, Nikolai Nikitin
This presentation reviews the main results of our recent work [A.K., D.M., N.N., Phys. Rev. D97, 053007 (2018)] on rare radiative leptonic decays and $B_{d,s}\t…
Compact Exotic Tetraquark Mesons in Large- QCD
Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian
We embark on systematic explorations of the behaviour of tetraquark mesons (colour-singlet bound states of two quarks and two antiquarks) in the (idealized) limit of a large number…
Revisiting nonfactorizable charm-loop effects in exclusive FCNC -decays
Anastasiia Kozachuk, Dmitri Melikhov
We revisit the calculation of nonfactorizable corrections induced by charm-quark loops in exclusive FCNC -decays. For the sake of clarity, we make use of a field theory with sca…