J. Körner

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19932021

most citedHelicity fractions of W bosons from top quark decays at NNLO in QCD

145 citations · 3k across the 88 of their papers we have counts for

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hep-ph2021★ 26 cited

Topological tensor invariants and the current algebra approach: Analysis of 196 nonleptonic two-body decays of single and double charm baryons -- a review

Stefan Groote, Jürgen G. Körner

We shed new light on the standard current algebra approach to the nonleptonic two-body decays of single and double heavy charm baryons. By making use of the completeness relation f…

hep-ph2017★ 35 cited

Theoretical description of the decays $Λ_{b} \to Λ^{(*)} (\frac{1}{2}^{\pm}, \frac{3}{2}^{\pm}) + J / ψ$

Thomas Gutsche, Mikhail A. Ivanov, Jürgen G. Körner +3

We calculate the invariant and helicity amplitudes for the transitions $Λ_{b} \to Λ^{(*)} (J^{P}) + J / ψ$ where the $Λ^{(*)} (J^{P})$ are $Λ (s u d)$ -type ground and excited states with…

hep-ph2016★ 3 cited

Analytical $O (α_{s})$ corrections to the beam frame double-spin density matrix elements of $e^{+} e^{-} \to t t ˉ$

L. Kaldamäe, S. Groote, J. G. Körner

We provide analytical results for the $O (α_{s})$ corrections to the double-spin density matrix elements in the reaction $e^{+} e^{-} \to t t ˉ$ . These concern the elements $l l$ , $l t$ , $l…

hep-ph2016★ 51 cited

Four-quark structure of Zc(3900), Z(4430) and Xb(5568) states

Fabian Goerke, Thomas Gutsche, Mikhail A. Ivanov +3

We examine the four-quark structure of the recently discovered charged $Z_{c} (3900)$ , $Z (4430)$ , and $X_{b} (5568)$ states. We calculate the widths of the strong decays $Z_c^+ \to J/ψπ^…

hep-ph2016★ 10 cited

Nucleon tensor form factors in a relativistic confined quark model

Thomas Gutsche, Mikhail A. Ivanov, Jurgen G. Korner +2

We present results for the isotriplet and isosinglet tensor form factors of the nucleon in the relativistic confined quark model. The model allows us to calculate not only their no…

hep-ph2016★ 10 cited

Isospin-violating strong decays of scalar single-heavy tetraquarks

Thomas Gutsche, Mikhail A. Ivanov, Jurgen G. Korner +1

We present a study of the isospin-violating one-pion strong decays of single heavy tetraquarks $X_{Q} = X (s q q ˉ Q ˉ)$ , $Q = c, b$ , and $q = u, d$ with spin-parity $J^{P} = 0^{+}$ . We…

hep-ph2016★ 87 cited

Analyzing new physics in the decays $B ˉ^{0} \to D^{(*)} τ^{-} ν ˉ_{τ}$ with form factors obtained from the covariant quark model

Mikhail A. Ivanov, Jürgen G. Körner, Chien-Thang Tran

We study possible New Physics (NP) effects in the exclusive decays $B ˉ^{0} \to D^{(*)} τ^{-} ν ˉ_{τ}$ . We extend the Standard Model (SM) by taking into account right-handed vec…

hep-ph2015★ 46 cited

Semileptonic decays $Λ_{c}^{+} \to Λ ℓ^{+} ν_{ℓ} (ℓ = e, μ)$ in the covariant quark model and comparison with the new absolute branching fraction measurements of Belle and BESIII

Thomas Gutsche, Mikhail A. Ivanov, Jurgen G. Korner +2

We present precise theoretical predictions for the absolute branching fractions of $Λ_{c}^{+} \to Λ ℓ^{+} ν_{ℓ} (ℓ = e, μ)$ decays in the covariant confined quark model. This study i…

hep-ph2015★ 5 cited

Physical observables in the decay $Λ_{b} \to Λ_{c} (\to Λ + π) + τ^{-} + ν ˉ_{τ}$

Nurgul Habyl, Thomas Gutsche, Mikhail A. Ivanov +3

We analyze the tauonic semileptonic baryon decays $Λ_{b}^{0} \to Λ_{c}^{+} + τ^{-} + ν ˉ_{τ}$ with particular emphasis on the lepton helicity flip contributions which vanish for zero lepto…

hep-ph2015★ 61 cited

Exclusive decays $B \to ℓ^{-} ν ˉ$ and $B \to D^{(*)} ℓ^{-} ν ˉ$ in the covariant quark model

Mikhail A. Ivanov, Jürgen G. Körner, Chien-Thang Tran

We study the exclusive leptonic and semileptonic $B$ decays $B \to ℓ^{-} ν ˉ$ and $B \to D^{(*)} ℓ^{-} ν ˉ$ in the framework of the covariant quark model with built-in infr…

hep-ph2015★ 15 cited

Lepton-mass effects in the decays $H \to Z Z^{} \to ℓ^{+} ℓ^{-} τ^{+} τ^{-}$ and $H \to W W^{} \to ℓ ν τ ν_{τ}$

Stefan Berge, Stefan Groote, Jürgen G. Körner +1

We consider lepton-mass effects in the cascade decays $H \to Z (\to ℓ^{+} ℓ^{-}) + Z^{*} (\to τ^{+} τ^{-})$ and $H \to W^{-} (\to ℓ^{-} ν ˉ_{ℓ}) + W^{+*} (\to τ^{+} ν_{τ})$ .…

hep-ph2014★ 59 cited

Heavy-to-light semileptonic decays of Lambda_b and Lambda_c baryons in the covariant confined quark model

Thomas Gutsche, Mikhail A. Ivanov, Jurgen G. Korner +2

We present a detailed analysis of the heavy-to-light semileptonic decays of the Lambda_b and Lambda_c baryons Lambda_b -> p l- bar(nu)_l and Lambda_c -> n l+ nu_l in the covariant…

hep-ph2014★ 2 cited

Helicity Amplitudes and Angular Decay Distributions

J. G. Körner

I discuss how to obtain angular decay distributions for sequential cascade decays using helicity methods. The angular decay distributions follow from a reasonably simple master for…

hep-ph2013★ 60 cited

Polarization effects in the cascade decay Lambda_b -> Lambda(-> p pi-) + J/psi(-> l+ l-) in the covariant confined quark model

Thomas Gutsche, Mikhail A. Ivanov, Jurgen G. Korner +2

We calculate the invariant and helicity amplitudes for the nonleptonic decay Lambda_b -> Lambda + J/psi, psi(2S) in the covariant confined quark model. We discuss joint angular dec…

hep-ph2013★ 6 cited

Fully analytical O(α_s) results for on-shell and off-shell polarized W-boson decays into massive quark pairs

S. Groote, J. G. Körner, P. Tuvike

We provide analytical $O (α_{s})$ results for the three polarized decay structure functions $H_{++}, H_{00}$ and $H_{--}$ that describe the decay of a polarized $W$ boson into massiv…

hep-ph2012★ 37 cited

Light baryons and their electromagnetic interactions in the covariant constituent quark model

Thomas Gutsche, Mikhail A. Ivanov, Jurgen G. Korner +2

We extend the confined covariant constituent quark model that was previously developed by us for mesons to the baryon sector. In our numerical calculation we use the same values fo…

hep-ph2012★ 12 cited

O(α_s) corrections to the decays of polarized W^+- and Z bosons into massive quark pairs

S. Groote, J. G. Körner, P. Tuvike

We present O(α_s) results on the decays of polarized W^+- and Z bosons into massive quark pairs. The NLO QCD corrections to the polarized decay functions are given up to the second…

hep-ph2011★ 65 cited

Form factors for semileptonic, nonleptonic and rare $B (B_{s})$ meson decays

Mikhail A. Ivanov, Jurgen G. Korner, Sergey G. Kovalenko +2

We provide new values for the model parameters of the covariant constituent quark model (with built--in infrared confinement) in the meson sector by a fit to the leptonic decay con…

hep-ph2011★ 62 cited

One-photon decay of the tetraquark state $X (3872) \to γ + J / ψ$ in a relativistic constituent quark model with infrared confinement

Stanislav Dubnicka, Anna Z. Dubnickova, Mikhail A. Ivanov +3

We further explore the consequences of treating the X(3872) meson as a tetraquark bound state by analyzing its one-photon decay X => γ+ J/psi in the framework of our approach devel…

hep-ph2010★ 66 cited

Radiative decays of double heavy baryons in a relativistic constituent three-quark model including hyperfine mixing

Tanja Branz, Amand Faessler, Thomas Gutsche +4

We study flavor-conserving radiative decays of double heavy baryons using a manifestly Lorentz covariant constituent three-quark model. Decay rates are calculated and compared to e…

hep-ph2010★ 145 cited

Helicity fractions of W bosons from top quark decays at NNLO in QCD

Andrzej Czarnecki, Jurgen G. Korner, Jan H. Piclum

Decay rates of unpolarized top quarks into longitudinally and transversally polarized W bosons are calculated to second order in the strong coupling constant alpha_s. Including the…

hep-ph2009★ 113 cited

Relativistic constituent quark model with infrared confinement

Tanja Branz, Amand Faessler, Thomas Gutsche +3

We refine the relativistic constituent quark model developed in our previous papers to include the confinement of quarks. It is done, first, by introducing the scale integration in…

hep-ph2009★ 79 cited

Semileptonic decays of double heavy baryons in a relativistic constituent three-quark model

Amand Faessler, Thomas Gutsche, Mikhail A. Ivanov +2

We study the semileptonic decays of double heavy baryons using a manifestly Lorentz covariant constituent three-quark model. We present complete results on transition form factors…

hep-ph2009★ 6 cited

$O (α_{s})$ corrections to the polar angle dependence of the longitudinal spin-spin correlation asymmetry in $e^{+} e^{-} \to q q ˉ$

S. Groote, J. G. Körner, J. A. Leyva

We provide analytical results for the $O (α_{s})$ corrections to the polar angle dependence of the longitudinal spin-spin correlation asymmetry in $e^{+} e^{-} \to q q ˉ$ . For top quark p…

Topological tensor invariants and the current algebra approach: Analysis of 196 nonleptonic two-body decays of single and double charm baryons -- a review

Theoretical description of the decays Λb​→Λ(∗)(21​±,23​±)+J/ψ

Analytical O(αs​) corrections to the beam frame double-spin density matrix elements of e+e−→ttˉ

Four-quark structure of Zc(3900), Z(4430) and Xb(5568) states

Nucleon tensor form factors in a relativistic confined quark model

Isospin-violating strong decays of scalar single-heavy tetraquarks

Analyzing new physics in the decays Bˉ0→D(∗)τ−νˉτ​ with form factors obtained from the covariant quark model

Semileptonic decays Λc+​→Λℓ+νℓ​(ℓ=e,μ) in the covariant quark model and comparison with the new absolute branching fraction measurements of Belle and BESIII

Physical observables in the decay Λb​→Λc​(→Λ+π)+τ−+νˉτ​

Exclusive decays B→ℓ−νˉ and B→D(∗)ℓ−νˉ in the covariant quark model

Lepton-mass effects in the decays H→ZZ∗→ℓ+ℓ−τ+τ− and H→WW∗→ℓντντ​

Heavy-to-light semileptonic decays of Lambda_b and Lambda_c baryons in the covariant confined quark model

Helicity Amplitudes and Angular Decay Distributions

Polarization effects in the cascade decay Lambda_b -> Lambda(-> p pi-) + J/psi(-> l+ l-) in the covariant confined quark model

Fully analytical O(α_s) results for on-shell and off-shell polarized W-boson decays into massive quark pairs

Light baryons and their electromagnetic interactions in the covariant constituent quark model

O(α_s) corrections to the decays of polarized W^+- and Z bosons into massive quark pairs

Form factors for semileptonic, nonleptonic and rare B(Bs​) meson decays

One-photon decay of the tetraquark state X(3872)→γ+J/ψ in a relativistic constituent quark model with infrared confinement

Radiative decays of double heavy baryons in a relativistic constituent three-quark model including hyperfine mixing

Helicity fractions of W bosons from top quark decays at NNLO in QCD

Relativistic constituent quark model with infrared confinement

Semileptonic decays of double heavy baryons in a relativistic constituent three-quark model

O(αs​) corrections to the polar angle dependence of the longitudinal spin-spin correlation asymmetry in e+e−→qqˉ​

Theoretical description of the decays $Λ_{b} \to Λ^{(*)} (\frac{1}{2}^{\pm}, \frac{3}{2}^{\pm}) + J / ψ$

Analytical $O (α_{s})$ corrections to the beam frame double-spin density matrix elements of $e^{+} e^{-} \to t t ˉ$

Analyzing new physics in the decays $B ˉ^{0} \to D^{(*)} τ^{-} ν ˉ_{τ}$ with form factors obtained from the covariant quark model

Semileptonic decays $Λ_{c}^{+} \to Λ ℓ^{+} ν_{ℓ} (ℓ = e, μ)$ in the covariant quark model and comparison with the new absolute branching fraction measurements of Belle and BESIII

Physical observables in the decay $Λ_{b} \to Λ_{c} (\to Λ + π) + τ^{-} + ν ˉ_{τ}$

Exclusive decays $B \to ℓ^{-} ν ˉ$ and $B \to D^{(*)} ℓ^{-} ν ˉ$ in the covariant quark model

Lepton-mass effects in the decays $H \to Z Z^{} \to ℓ^{+} ℓ^{-} τ^{+} τ^{-}$ and $H \to W W^{} \to ℓ ν τ ν_{τ}$

Form factors for semileptonic, nonleptonic and rare $B (B_{s})$ meson decays

One-photon decay of the tetraquark state $X (3872) \to γ + J / ψ$ in a relativistic constituent quark model with infrared confinement

$O (α_{s})$ corrections to the polar angle dependence of the longitudinal spin-spin correlation asymmetry in $e^{+} e^{-} \to q q ˉ$