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N. Di Bartolomeo

Bio: N. Di Bartolomeo is an academic researcher from University of Geneva. The author has contributed to research in topics: Quark & Meson. The author has an hindex of 16, co-authored 32 publications receiving 1523 citations. Previous affiliations of N. Di Bartolomeo include International School for Advanced Studies.

Papers
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TL;DR: In this article, an effective chiral lagrangian for heavy and light mesons describing strong interactions among effective meson fields as well as their couplings to electromagnetic and weak currents, including the relevant symmetry-breaking terms is presented.

517 citations

Journal ArticleDOI
TL;DR: In this paper, an effective chiral lagrangian for heavy and light mesons describing strong interactions among effective meson fields as well as their couplings to electromagnetic and weak currents, including the relevant symmetry breaking terms is presented.
Abstract: The approximate symmetries of Quantum ChromoDynamics in the infinite heavy quark ($Q=c,b$) mass limit ($m_Q \to \infty$) and in the chiral limit for the light quarks ($m_q \to 0,\;q=\,u,\,d,\,s$) can be used together to build up an effective chiral lagrangian for heavy and light mesons describing strong interactions among effective meson fields as well as their couplings to electromagnetic and weak currents, including the relevant symmetry breaking terms. The effective theory includes heavy ($Q \bar q$) mesons of both negative and positive parity, light pseudoscalars, as well as light vector mesons. We summarize the estimates for the parameters entering the effective lagrangian and discuss in particular some phenomenologically important couplings, such as $g_{B^* B \pi}$. The hyperfine splitting of heavy mesons is discussed in detail. The effective lagrangian allows for the possibility to describe consistently weak couplings of heavy ($B,\, D$) to light ($\pi,\, \rho, \, K^*,\,$ etc.) mesons. The method has however its own limitations, due to the requirement that the light meson momenta should be small, and we discuss how such limitations can be circumvented through reasonable ansatz on the form factors. Flavour conserving (e. g. $B^* \to B\, \gamma$) and flavour changing (e. g. $B \to K^* \, \gamma$) radiative decays provide another field of applications of effective lagrangians; they are discussed together with their phenomenological implications. Finally we analyze effective lagrangians describing heavy charmonium- like ($\bar Q Q$) mesons and their strong and electromagnetic interactions. The role of approximate heavy quark symmetries for this case and the phenomenological tests of these models are also discussed.

387 citations

Journal ArticleDOI
TL;DR: In this paper, an effective lagrangian including negative and positive parity heavy mesons containing a heavy quark, light pseudoscalars, and light vector resonances, with their allowed interactions, was introduced.

115 citations

Journal ArticleDOI
TL;DR: In this paper, an analysis of two-body non-leptonic decays of B and Bs mesons in the factorization approximation was performed, using the semileptonic decay amplitudes calculated on the basis of an effective lagrangian satisfying chiral and heavy quark symmetries.

79 citations

Journal ArticleDOI
TL;DR: In this article, a chiral effective lagrangian was proposed to describe interactions of light pseudoscalars with mesons containing a heavy quark, incorporating light vector resonances such as ϱ, etc.

66 citations


Cited by
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Journal ArticleDOI
TL;DR: Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model as discussed by the authors, and investigated various theoretical interpretations of these candidates of the multiquark states.

1,083 citations

Journal ArticleDOI
TL;DR: In this paper, the authors provide a rigorous basis for factorization for a large class of non-leptonic two-body B -meson decays in the heavy quark limit.

959 citations

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TL;DR: The breaking of electroweak symmetry, and origin of the associated "weak scale" vweak = 1/ q 2 √ 2GF = 175 GeV, may be due to a new strong interaction as mentioned in this paper.

838 citations

Journal ArticleDOI
TL;DR: In this paper, a coherent field-theory-derived quantum-mechanical scheme was proposed to calculate the properties of bound states made by two or more heavy quarks.
Abstract: We briefly review how nonrelativistic effective field theories give us a definition of the QCD potentials and a coherent field-theory-derived quantum-mechanical scheme to calculate the properties of bound states made by two or more heavy quarks. In this framework heavy quarkonium properties depend only on the QCD parameters (quark masses and αs) and nonpotential corrections are systematically accounted for. The relation between the form of the nonperturbative potentials and the low-energy QCD dynamics is also discussed.

594 citations

Journal ArticleDOI
TL;DR: In this article, the authors review the theoretical understanding of this sector of particle physics phenomenology and present some considerations attempting a coherent description of the so called X and Z resonances.
Abstract: Multiquark resonances are undoubtedly experimentally observed The number of states and the amount of details on their properties has been growing over the years It is very recent the discovery of two pentaquarks and the confirmation of four tetraquarks, two of which had not been observed before We mainly review the theoretical understanding of this sector of particle physics phenomenology and present some considerations attempting a coherent description of the so called X and Z resonances The prominent problems plaguing theoretical models, like the absence of selection rules limiting the number of states predicted, motivate new directions in model building Data are reviewed going through all of the observed resonances with particular attention to their common features and the purpose of providing a starting point to further research

548 citations