Franz Niecknig
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Franz Niecknig has a total of 49 co-authors. Here are the top co-authors by number of shared publications:
- Bastian Kubis
Universität Bonn
7 shared publications - Sebastian P. Schneider
Helmholtz-Institut für Strahlen-und Kernphysik and Bethe Center for Theoretical Physics Universität Bonn D-53115 Bonn Germany
4 shared publications - A. Dybczak1 shared publication
- A. Nikolaev1 shared publication
- Amir H. Fariborz
Department of Mathematics and Physics State University of New York Polytechnic Institute 13502 Utica NY USA
1 shared publication - Andreas Wirzba
Forschungszentrum Jülich
1 shared publication
Latest Publications
- Open Access
Dispersion-theoretical analysis of the D^+ --> K^- pi^+ pi^+ Dalitz plot
We study the Dalitz plot of the Cabibbo-favored charmed-meson decay $D^+\to K^-\pi^+\pi^+$ using dispersion theory. The formalism respects all constraints from analyticity and unitarity, and consistently describes final-state interactions between all three decay products. We employ pion-pion and pion-kaon phase shifts as input, and fit the pertinent subtraction constants to Dalitz plot data by the CLEO and FOCUS collaborations. Phase motions of resonant as well as nonresonant amplitudes are discussed, which should provide crucial input for future studies of CP violation in similar three-body charm decays.Open AccessDispersion-theoretical analysis of the D^+ --> K^- pi^+ pi^+ Dalitz plot
We study the Dalitz plot of the Cabibbo-favored charmed-meson decay $D^+\to K^-\pi^+\pi^+$ using dispersion theory. The formalism respects all constraints from analyticity and unitarity, and consistently describes final-state interactions between all three decay products. We employ pion-pion and pion-kaon phase shifts as input, and fit the pertinent subtraction constants to Dalitz plot data by the CLEO and FOCUS collaborations. Phase motions of resonant as well as nonresonant amplitudes are discussed, which should provide crucial input for future studies of CP violation in similar three-body charm decays. - Open Access
- 22 October 2015
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2015 (10) , 1-33
Dispersion-theoretical analysis of the D + → K − π + π + Dalitz plot
- 22 October 2015
- Published by Springer Nature in Journal of High Energy Physics
- Vol. 2015 (10) , 1-33
Open AccessDispersion-theoretical analysis of the D + → K − π + π + Dalitz plot
- Open Access
Analysis of the J/psi --> pi^0 gamma^* transition form factor
In view of the first measurement of the branching fraction for J/psi --> pi^0 e^+ e^- by the BESIII collaboration, we analyze what can be learnt on the corresponding transition form factor using dispersion theory. We show that light-quark degrees of freedom dominate the spectral function, in particular two-pion intermediate states. Estimating the effects of multi-pion states as well as charmonium, we arrive at a prediction for the complete form factor that should be scrutinized experimentally in the future.
Open AccessAnalysis of the J/psi --> pi^0 gamma^* transition form factor
In view of the first measurement of the branching fraction for J/psi --> pi^0 e^+ e^- by the BESIII collaboration, we analyze what can be learnt on the corresponding transition form factor using dispersion theory. We show that light-quark degrees of freedom dominate the spectral function, in particular two-pion intermediate states. Estimating the effects of multi-pion states as well as charmonium, we arrive at a prediction for the complete form factor that should be scrutinized experimentally in the future.
- 19 February 2015
- Published by American Physical Society (APS) in Physical Review D
- Vol. 91 (3) , 036004
Analysis of thetransition form factorIn view of the first measurement of the branching fraction for by the BESIII collaboration, we analyze what can be learned on the corresponding transition form factor using dispersion theory. We show that light-quark degrees of freedom dominate the spectral function, in particular two-pion intermediate states. Estimating the effects of multipion states as well as charmonium, we arrive at a prediction for the complete form factor that should be scrutinized experimentally in the future.- 19 February 2015
- Published by American Physical Society (APS) in Physical Review D
- Vol. 91 (3) , 036004
Analysis of thetransition form factorIn view of the first measurement of the branching fraction for by the BESIII collaboration, we analyze what can be learned on the corresponding transition form factor using dispersion theory. We show that light-quark degrees of freedom dominate the spectral function, in particular two-pion intermediate states. Estimating the effects of multipion states as well as charmonium, we arrive at a prediction for the complete form factor that should be scrutinized experimentally in the future.- Open Access
omega --> pi0 gamma* and phi --> pi0 gamma* Transition form factors in dispersion theory
We calculate the omega --> pi0 gamma* and phi --> pi0 gamma* electromagnetic transition form factors based on dispersion theory, relying solely on a previous dispersive analysis of the corresponding three-pion decays and the pion vector form factor. We compare our findings to recent measurements of the omega --> pi0 mu+ mu- decay spectrum by the NA60 collaboration, and strongly encourage experimental investigation of the Okubo-Zweig-Iizuka-forbidden phi --> pi0 l+ l- decays in order to understand the strong deviations from vector-meson dominance found in these transition form factors.
Open Accessomega --> pi0 gamma* and phi --> pi0 gamma* Transition form factors in dispersion theory
We calculate the omega --> pi0 gamma* and phi --> pi0 gamma* electromagnetic transition form factors based on dispersion theory, relying solely on a previous dispersive analysis of the corresponding three-pion decays and the pion vector form factor. We compare our findings to recent measurements of the omega --> pi0 mu+ mu- decay spectrum by the NA60 collaboration, and strongly encourage experimental investigation of the Okubo-Zweig-Iizuka-forbidden phi --> pi0 l+ l- decays in order to understand the strong deviations from vector-meson dominance found in these transition form factors.
- 12 September 2012
- Published by American Physical Society (APS) in Physical Review D
- Vol. 86 (5)
andtransition form factors in dispersion theoryWe calculate the $\omega${}$\rightarrow${}$\pi${}0$\gamma${}* and $\phi${}$\rightarrow${}$\pi${}0$\gamma${}* electromagnetic transition form factors based on dispersion theory, relying solely on a previous dispersive analysis of the corresponding three-pion decays and the pion vector form factor. We compare our findings to recent measurements of the $\omega${}$\rightarrow${}$\pi${}0$\mu${}+$\mu${}- decay spectrum by the NA60 collaboration, and strongly encourage experimental investigation of the Okubo-Zweig-Iizuka forbidden $\phi${}$\rightarrow${}$\pi${}0$\ell${}+$\ell${}- decays in order to understand the strong deviations from vector-meson dominance found in these transition form factors.
- 12 September 2012
- Published by American Physical Society (APS) in Physical Review D
- Vol. 86 (5)
andtransition form factors in dispersion theoryWe calculate the $\omega${}$\rightarrow${}$\pi${}0$\gamma${}* and $\phi${}$\rightarrow${}$\pi${}0$\gamma${}* electromagnetic transition form factors based on dispersion theory, relying solely on a previous dispersive analysis of the corresponding three-pion decays and the pion vector form factor. We compare our findings to recent measurements of the $\omega${}$\rightarrow${}$\pi${}0$\mu${}+$\mu${}- decay spectrum by the NA60 collaboration, and strongly encourage experimental investigation of the Okubo-Zweig-Iizuka forbidden $\phi${}$\rightarrow${}$\pi${}0$\ell${}+$\ell${}- decays in order to understand the strong deviations from vector-meson dominance found in these transition form factors.
- Open Access
Proceedings of the second International PrimeNet Workshop
These are the proceedings of the second PrimeNet Workshop, held in September 26-28, 2011, at the campus of Forschungszentrum J\"{u}lich, Germany. This workshop is part of the activities in the project "Study of Strongly Interacting Matter" (acronym HadronPhysics2), which is an integrating activity of the Seventh Framework Program of EU. This HP2 project contains several activities, one of them being the network PrimeNet having the focus on Meson Physics in Low-Energy QCD. This network is created to exchange information on experimental and theoretical ongoing activities on mainly eta and eta-prime physics at different European accelerator facilities and institutes.
Open AccessProceedings of the second International PrimeNet Workshop
These are the proceedings of the second PrimeNet Workshop, held in September 26-28, 2011, at the campus of Forschungszentrum J\"{u}lich, Germany. This workshop is part of the activities in the project "Study of Strongly Interacting Matter" (acronym HadronPhysics2), which is an integrating activity of the Seventh Framework Program of EU. This HP2 project contains several activities, one of them being the network PrimeNet having the focus on Meson Physics in Low-Energy QCD. This network is created to exchange information on experimental and theoretical ongoing activities on mainly eta and eta-prime physics at different European accelerator facilities and institutes.
- 1 April 2012
- Published by Elsevier in Nuclear Physics B - Proceedings Supplements
- Vol. 225-227, 75-79
On the role of final-state interactions in Dalitz plot studies
- 1 April 2012
- Published by Elsevier in Nuclear Physics B - Proceedings Supplements
- Vol. 225-227, 75-79
On the role of final-state interactions in Dalitz plot studies