Gorazd Cvetič
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Gorazd Cvetič has a total of 107 co-authors. Here are the top co-authors by number of shared publications:
- Choong Sun Kim
Yonsei University
31 shared publications - César Ayala
Universidad de Tarapacá
26 shared publications - Claudio O. Dib
Universidad Tecnica Federico Santa Maria
10 shared publications - Jilberto Antonio Zamora Saa
Millennium Institute for Subatomic physics at high energy frontier (SAPHIR)
10 shared publications - Cristian Valenzuela
Facultad de Física Universidad Católica de Chile Casilla 306 Santiago 22 Pontificia Chile
9 shared publications - Diego Teca
Department of Physics Universidad Técnica Federico Santa María (UTFSM) Casilla 110-V Valparaíso Chile
6 shared publications
Latest Publications
- Open Access
- 19 October 2026
- Published by Springer Nature in The European Physical Journal C
- Vol. 86 (10) , 1186
Renormalon-based resummation for B(D) mesons
We apply a previously developed method of renormalon-based resummation of spacelike and timelike QCD observables, to evaluate of the values of the pole masses $$m_q$$ of $$q=b$$ and c quarks, using as input the knowledge of the values of the corresponding $${\overline{\textrm{MS}}}$$ masses $${\overline{m}}_q \equiv {\overline{m}}_q({\overline{m}}_q^2)$$ . The evaluation also uses the knowledge of the first few coefficients of the perturbation expansion of $$m_q$$ (i.e., of $$m_q/{\overline{m}}_q$$ ), as well as the known renormalon structure of that expansion. In the evaluation, we use the timelike QCD running coupling based on a specific holomorphic spacelike QCD coupling, in order to avoid additional ambiguities due to the Landau poles of the usual perturbative coupling. The principal IR regulator parameter of the coupling is varied in an expected range. We also reevaluate the chromomagnetic Wilson coefficient of heavy quark $${\hat{C}}(m_q^2)$$ , and extract values of several corresponding hadronic parameters.- 19 October 2026
- Published by Springer Nature in The European Physical Journal C
- Vol. 86 (10) , 1186
Open AccessRenormalon-based resummation for B(D) mesons
We apply a previously developed method of renormalon-based resummation of spacelike and timelike QCD observables, to evaluate of the values of the pole masses $$m_q$$ of $$q=b$$ and c quarks, using as input the knowledge of the values of the corresponding $${\overline{\textrm{MS}}}$$ masses $${\overline{m}}_q \equiv {\overline{m}}_q({\overline{m}}_q^2)$$ . The evaluation also uses the knowledge of the first few coefficients of the perturbation expansion of $$m_q$$ (i.e., of $$m_q/{\overline{m}}_q$$ ), as well as the known renormalon structure of that expansion. In the evaluation, we use the timelike QCD running coupling based on a specific holomorphic spacelike QCD coupling, in order to avoid additional ambiguities due to the Landau poles of the usual perturbative coupling. The principal IR regulator parameter of the coupling is varied in an expected range. We also reevaluate the chromomagnetic Wilson coefficient of heavy quark $${\hat{C}}(m_q^2)$$ , and extract values of several corresponding hadronic parameters. - Open Access
- 1 February 2026
- Published by IOP Publishing in Journal of Physics G: Nuclear and Particle Physics
- Vol. 53 (2) , 025005
Renormalon-based resummation for spacelike and timelike QCD quantities whose perturbation expansion has general form
We present a generalisation of our previous approach of a renormalon-motivated resummation of the QCD observables. Previously it was applied to the spacelike observables whose perturbation expansion was D ( Q 2 ) = a ( Q 2 ) + O ( a 2 ) , where a ( Q 2 ) ≡ α s ( Q 2 )/ π is the running QCD coupling. Now we generalise the resummation to spacelike quantities D ( Q 2 ) = a ( Q 2 ) ν 0 + O ( a ν 0 + 1 ) and timelike quantities F ( σ ) = a ( σ ) ν 0 + O ( a ν 0 + 1 ) , where ν 0 is in general a noninteger number (0 < ν 0 ≤ 1). We evaluate with this approach a timelike quantity, namely the scheme-invariant factor of the Wilson coefficient of the chromomagnetic operator in the heavy-quark effective Lagrangian, and related quantities.
- 1 February 2026
- Published by IOP Publishing in Journal of Physics G: Nuclear and Particle Physics
- Vol. 53 (2) , 025005
Open AccessRenormalon-based resummation for spacelike and timelike QCD quantities whose perturbation expansion has general form
We present a generalisation of our previous approach of a renormalon-motivated resummation of the QCD observables. Previously it was applied to the spacelike observables whose perturbation expansion was D ( Q 2 ) = a ( Q 2 ) + O ( a 2 ) , where a ( Q 2 ) ≡ α s ( Q 2 )/ π is the running QCD coupling. Now we generalise the resummation to spacelike quantities D ( Q 2 ) = a ( Q 2 ) ν 0 + O ( a ν 0 + 1 ) and timelike quantities F ( σ ) = a ( σ ) ν 0 + O ( a ν 0 + 1 ) , where ν 0 is in general a noninteger number (0 < ν 0 ≤ 1). We evaluate with this approach a timelike quantity, namely the scheme-invariant factor of the Wilson coefficient of the chromomagnetic operator in the heavy-quark effective Lagrangian, and related quantities.
- Open Access
- 10 December 2024
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2024 (12) , 1-22
Towards unifying perturbative and Holographic Light-Front QCD via holomorphic coupling
A bstract: We construct a QCD coupling $$ \mathcal{A} $$ ( Q 2 ) in the Effective Charge (ECH) scheme of the canonical part d ( Q 2 ) of the (inelastic) polarised Bjorken Sum Rule (BSR) $$ {\overline{\Gamma}}_1^{\textrm{p}-\textrm{n}} $$ ( Q 2 ). In the perturbative domain, the coupling $$ \mathcal{A} $$ ( Q 2 ) practically coincides with the perturbative coupling a ( Q 2 ) [≡ α s ( Q 2 )/ π ] in the four-loop ECH renormalisation scheme. In the deep infrared (IR) regime, $$ \mathcal{A} $$ ( Q 2 ) behaves as suggested by the Holographic Light-Front QCD up to the second derivative. Furthermore, in contrast to its perturbative counterpart a ( Q 2 ), the coupling $$ \mathcal{A} $$ ( Q 2 ) is holomorphic in the entire complex Q 2 -plane with the exception of the negative semiaxis, reflecting the holomorphic properties of the BSR observable d ( Q 2 ) [or: $$ {\overline{\Gamma}}_1^{\textrm{p}-\textrm{n}} $$ ( Q 2 )] as dictated by the general principles of the Quantum Field Theory. It turns out that the obtained coupling, used as ECH, reproduces quite well the experimental data for $$ {\overline{\Gamma}}_1^{\textrm{p}-\textrm{n}} $$ ( Q 2 ) in the entire N f = 3 regime 0 < Q 2 ≲ 5 GeV 2 .- 10 December 2024
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2024 (12) , 1-22
Open AccessTowards unifying perturbative and Holographic Light-Front QCD via holomorphic coupling
A bstract: We construct a QCD coupling $$ \mathcal{A} $$ ( Q 2 ) in the Effective Charge (ECH) scheme of the canonical part d ( Q 2 ) of the (inelastic) polarised Bjorken Sum Rule (BSR) $$ {\overline{\Gamma}}_1^{\textrm{p}-\textrm{n}} $$ ( Q 2 ). In the perturbative domain, the coupling $$ \mathcal{A} $$ ( Q 2 ) practically coincides with the perturbative coupling a ( Q 2 ) [≡ α s ( Q 2 )/ π ] in the four-loop ECH renormalisation scheme. In the deep infrared (IR) regime, $$ \mathcal{A} $$ ( Q 2 ) behaves as suggested by the Holographic Light-Front QCD up to the second derivative. Furthermore, in contrast to its perturbative counterpart a ( Q 2 ), the coupling $$ \mathcal{A} $$ ( Q 2 ) is holomorphic in the entire complex Q 2 -plane with the exception of the negative semiaxis, reflecting the holomorphic properties of the BSR observable d ( Q 2 ) [or: $$ {\overline{\Gamma}}_1^{\textrm{p}-\textrm{n}} $$ ( Q 2 )] as dictated by the general principles of the Quantum Field Theory. It turns out that the obtained coupling, used as ECH, reproduces quite well the experimental data for $$ {\overline{\Gamma}}_1^{\textrm{p}-\textrm{n}} $$ ( Q 2 ) in the entire N f = 3 regime 0 < Q 2 ≲ 5 GeV 2 . - 9 October 2024
- Published by Elsevier in Nuclear and Particle Physics Proceedings
- Vol. 347, 32-36
Bjorken polarised sum rule with IR-finite QCD coupling
- 9 October 2024
- Published by Elsevier in Nuclear and Particle Physics Proceedings
- Vol. 347, 32-36
Bjorken polarised sum rule with IR-finite QCD coupling
- Top Cited PapersOpen Access
- 1 September 2024
- Published by IOP Publishing in Journal of Physics G: Nuclear and Particle Physics
- Vol. 51 (9) , 090501
The strong coupling constant: state of the art and the decade ahead
Theoretical predictions for particle production cross sections and decays at colliders rely heavily on perturbative Quantum Chromodynamics (QCD) calculations, expressed as an expansion in powers of the strong coupling constant α S . The current O ( 1 % ) uncertainty of the QCD coupling evaluated at the reference Z boson mass, α S ( m Z 2 ) = 0.1179 ± 0.0009 , is one of the limiting factors to more precisely describe multiple processes at current and future colliders. A reduction of this uncertainty is thus a prerequisite to perform precision tests of the Standard Model as well as searches for new physics. This report provides a comprehensive summary of the state-of-the-art, challenges, and prospects in the experimental and theoretical study of the strong coupling. The current α S ( m Z 2 ) world average is derived from a combination of seven categories of observables: (i) lattice QCD, (ii) hadronic τ decays, (iii) deep-inelastic scattering and parton distribution functions fits, (iv) electroweak boson decays, hadronic final-states in (v) e+e−, (vi) e–p, and (vii) p–p collisions, and (viii) quarkonia decays and masses. We review the current status of each of these seven α S ( m Z 2 ) extraction methods, discuss novel α S determinations, and examine the averaging method used to obtain the world-average value. Each of the methods discussed provides a ‘wish list’ of experimental and theoretical developments required in order to achieve the goal of a per-mille precision on α S ( m Z 2 ) within the next decade.
- 1 September 2024
- Published by IOP Publishing in Journal of Physics G: Nuclear and Particle Physics
- Vol. 51 (9) , 090501
Top Cited PapersOpen AccessThe strong coupling constant: state of the art and the decade ahead
Theoretical predictions for particle production cross sections and decays at colliders rely heavily on perturbative Quantum Chromodynamics (QCD) calculations, expressed as an expansion in powers of the strong coupling constant α S . The current O ( 1 % ) uncertainty of the QCD coupling evaluated at the reference Z boson mass, α S ( m Z 2 ) = 0.1179 ± 0.0009 , is one of the limiting factors to more precisely describe multiple processes at current and future colliders. A reduction of this uncertainty is thus a prerequisite to perform precision tests of the Standard Model as well as searches for new physics. This report provides a comprehensive summary of the state-of-the-art, challenges, and prospects in the experimental and theoretical study of the strong coupling. The current α S ( m Z 2 ) world average is derived from a combination of seven categories of observables: (i) lattice QCD, (ii) hadronic τ decays, (iii) deep-inelastic scattering and parton distribution functions fits, (iv) electroweak boson decays, hadronic final-states in (v) e+e−, (vi) e–p, and (vii) p–p collisions, and (viii) quarkonia decays and masses. We review the current status of each of these seven α S ( m Z 2 ) extraction methods, discuss novel α S determinations, and examine the averaging method used to obtain the world-average value. Each of the methods discussed provides a ‘wish list’ of experimental and theoretical developments required in order to achieve the goal of a per-mille precision on α S ( m Z 2 ) within the next decade.
- Open Access
- 30 August 2024
- Published by Elsevier in Nuclear Physics B
- Vol. 1007
Renormalon-based resummation of Bjorken polarised sum rule in holomorphic QCD
- 30 August 2024
- Published by Elsevier in Nuclear Physics B
- Vol. 1007
Open AccessRenormalon-based resummation of Bjorken polarised sum rule in holomorphic QCD
- Open AccessRare tau decays via exchange of on-shell almost degenerate Majorana neutrinos, $τ^{\mp} \to π^{\mp} N_j \to π^{\mp} μ^{\mp} π^{\pm}$ and $τ^{\mp} \to π^{\mp} N_j \to π^{\mp} μ^{\pm} π^{\mp}$We investigate rare decays of tau leptons that occur via exchange of heavy on-shell neutrinos $N_j$ ($j=1,2$). These neutrinos can be either Dirac or Majorana, and are considered to be almost degenerate in mass. The decays can thus be either lepton number conserving (LNC), $τ^{\mp} \to π^{\mp} N_j \to π^{\mp} μ^{\mp} π^{\pm}$, or lepton number violating (LNV), $τ^{\mp} \to π^{\mp} N_j \to π^{\mp} μ^{\pm} π^{\mp}$. If neutrinos are Dirac, only LNC decays are possible. If they are Majorana, both LNC and LNV are possible. We derive the corresponding expressions for the effective decay widths $Γ_{{\rm eff},\mp}^{\rm (X)}$ (X=LNC, LNV) of these rare decays, where we account for $N_1$-$N_2$ overlap and oscillation effects and for the finite detector length effects. We then numerically evaluate these decay widths as well as the related CP violation asymmetry width $ΔΓ_{\rm CP}^{\rm (X)} = (Γ_{{\rm eff},-}^{\rm (X)} - Γ_{{\rm eff},+}^{\rm (X)})$. We conclude that for certain, presently allowed, ranges of the heavy-light neutrino mixing parameters, such decays and asymmetries could be observed in Belle II experiment.Open AccessRare tau decays via exchange of on-shell almost degenerate Majorana neutrinos, $τ^{\mp} \to π^{\mp} N_j \to π^{\mp} μ^{\mp} π^{\pm}$ and $τ^{\mp} \to π^{\mp} N_j \to π^{\mp} μ^{\pm} π^{\mp}$We investigate rare decays of tau leptons that occur via exchange of heavy on-shell neutrinos $N_j$ ($j=1,2$). These neutrinos can be either Dirac or Majorana, and are considered to be almost degenerate in mass. The decays can thus be either lepton number conserving (LNC), $τ^{\mp} \to π^{\mp} N_j \to π^{\mp} μ^{\mp} π^{\pm}$, or lepton number violating (LNV), $τ^{\mp} \to π^{\mp} N_j \to π^{\mp} μ^{\pm} π^{\mp}$. If neutrinos are Dirac, only LNC decays are possible. If they are Majorana, both LNC and LNV are possible. We derive the corresponding expressions for the effective decay widths $Γ_{{\rm eff},\mp}^{\rm (X)}$ (X=LNC, LNV) of these rare decays, where we account for $N_1$-$N_2$ overlap and oscillation effects and for the finite detector length effects. We then numerically evaluate these decay widths as well as the related CP violation asymmetry width $ΔΓ_{\rm CP}^{\rm (X)} = (Γ_{{\rm eff},-}^{\rm (X)} - Γ_{{\rm eff},+}^{\rm (X)})$. We conclude that for certain, presently allowed, ranges of the heavy-light neutrino mixing parameters, such decays and asymmetries could be observed in Belle II experiment.
- Open Access
- 27 February 2024
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2024 (2) , 1-19
Rare tau decays via exchange of on-shell almost degenerate Majorana neutrinos, τ∓ → π∓Nj → π∓μ∓π± and τ∓ → π∓Nj → π∓μ±π∓
We investigate rare decays of tau leptons that occur via exchange of heavy on-shell neutrinos N j (j = 1, 2). These neutrinos can be either Dirac or Majorana, and are considered to be almost degenerate in mass. The decays can thus be either lepton number conserving (LNC), τ ∓ → π ∓ N j → π ∓ μ ∓ π ±, or lepton number violating (LNV), τ ∓ → π ∓ N j → π ∓ μ ± π ∓. If neutrinos are Dirac, only LNC decays are possible. If they are Majorana, both LNC and LNV are possible. We derive the corresponding expressions for the effective decay widths $$ {\Gamma}_{\textrm{eff},\mp}^{\left(\textrm{X}\right)} $$ (X=LNC, LNV) of these rare decays, where we account for N 1-N 2 overlap and oscillation effects and for the finite detector length effects. We then numerically evaluate these decay widths as well as the related CP violation asymmetry width $$ \Delta {\Gamma}_{\textrm{CP}}^{\left(\textrm{X}\right)}=\left({\Gamma}_{\textrm{eff},-}^{\left(\textrm{X}\right)}-{\Gamma}_{\textrm{eff},+}^{\left(\textrm{X}\right)}\right) $$ . We conclude that for certain, presently allowed, ranges of the heavy-light neutrino mixing parameters, such decays and asymmetries could be observed in Belle II experiment.- 27 February 2024
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2024 (2) , 1-19
Open AccessRare tau decays via exchange of on-shell almost degenerate Majorana neutrinos, τ∓ → π∓Nj → π∓μ∓π± and τ∓ → π∓Nj → π∓μ±π∓
We investigate rare decays of tau leptons that occur via exchange of heavy on-shell neutrinos N j (j = 1, 2). These neutrinos can be either Dirac or Majorana, and are considered to be almost degenerate in mass. The decays can thus be either lepton number conserving (LNC), τ ∓ → π ∓ N j → π ∓ μ ∓ π ±, or lepton number violating (LNV), τ ∓ → π ∓ N j → π ∓ μ ± π ∓. If neutrinos are Dirac, only LNC decays are possible. If they are Majorana, both LNC and LNV are possible. We derive the corresponding expressions for the effective decay widths $$ {\Gamma}_{\textrm{eff},\mp}^{\left(\textrm{X}\right)} $$ (X=LNC, LNV) of these rare decays, where we account for N 1-N 2 overlap and oscillation effects and for the finite detector length effects. We then numerically evaluate these decay widths as well as the related CP violation asymmetry width $$ \Delta {\Gamma}_{\textrm{CP}}^{\left(\textrm{X}\right)}=\left({\Gamma}_{\textrm{eff},-}^{\left(\textrm{X}\right)}-{\Gamma}_{\textrm{eff},+}^{\left(\textrm{X}\right)}\right) $$ . We conclude that for certain, presently allowed, ranges of the heavy-light neutrino mixing parameters, such decays and asymmetries could be observed in Belle II experiment. - Open Access
Evaluation of Bjorken polarised sum rule with a renormalon-motivated approach
We use the known renormalon structure of Bjorken polarised sum rule (BSR) ${\overline Γ}_1^{p-n}(Q^2)$ to evaluate the leading-twist part of that quantity. In addition, we include $D=2$ and $D=4$ Operator Product Expansion (OPE) terms and fit this expression to available experimental data for inelastic BSR. Since we use perturbative QCD (pQCD) coupling, which fails at low squared spacelike momenta $Q^2 \lesssim 1 \ {\rm GeV}^2$ due to Landau singularities, the fit is performed for $Q^2 \geq Q^2_{\rm min}$ where $Q^2_{\rm min} \approx (1.7 \pm 0.3) \ {\rm GeV}^2$. Due to large BSR experimental uncertainties, the extracted value of the pQCD coupling has very large uncertainties, especially when $Q^2_{\rm min}$ is varied. However, when we fix the pQCD coupling to the known world average values, the $D=2$ and $D=4$ residue parameters can be determined within large but reasonable uncertainties.Open AccessEvaluation of Bjorken polarised sum rule with a renormalon-motivated approach
We use the known renormalon structure of Bjorken polarised sum rule (BSR) ${\overline Γ}_1^{p-n}(Q^2)$ to evaluate the leading-twist part of that quantity. In addition, we include $D=2$ and $D=4$ Operator Product Expansion (OPE) terms and fit this expression to available experimental data for inelastic BSR. Since we use perturbative QCD (pQCD) coupling, which fails at low squared spacelike momenta $Q^2 \lesssim 1 \ {\rm GeV}^2$ due to Landau singularities, the fit is performed for $Q^2 \geq Q^2_{\rm min}$ where $Q^2_{\rm min} \approx (1.7 \pm 0.3) \ {\rm GeV}^2$. Due to large BSR experimental uncertainties, the extracted value of the pQCD coupling has very large uncertainties, especially when $Q^2_{\rm min}$ is varied. However, when we fix the pQCD coupling to the known world average values, the $D=2$ and $D=4$ residue parameters can be determined within large but reasonable uncertainties. - 8 November 2023
- Published by Elsevier in Nuclear and Particle Physics Proceedings
- Vol. 343, 94-98
Renormalon structure in Bjorken sum rule
- 8 November 2023
- Published by Elsevier in Nuclear and Particle Physics Proceedings
- Vol. 343, 94-98
Renormalon structure in Bjorken sum rule