A detailed analysis ofD-,D s - andB-meson transition form factors and the determination of |V cb |

1990 ◽  
Vol 48 (4) ◽  
pp. 663-671 ◽  
Author(s):  
J. G. Körner ◽  
K. Schilcher ◽  
M. Wirbel ◽  
Y. L. Wu
Keyword(s):  
Detailed Analysis ◽  
Form Factors ◽  
Transition Form

scholarly journals Towards a dispersive determination of the η and η′ transition form factors

2018 ◽  
Vol 166 ◽  
pp. 00012 ◽  
Author(s):  
Bastian Kubis
Keyword(s):  
Light Scattering ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Form Factors ◽  
Experimental Information ◽  
Transition Form ◽  
Dispersive Analysis

We discuss status and prospects of a dispersive analysis of the η and η′ transition form factors. Particular focus is put on the various pieces of experimental information that serve as input to such a calculation. These can help improve on the precision of an evaluation of the η and η′ pole contributions to hadronic light-by-light scattering in the anomalous magnetic moment of the muon.

scholarly journals γγ Physics and Transition Form Factors with KLOE/KLOE2

2019 ◽  
Vol 218 ◽  
pp. 03003
Author(s):  
Elena Pérez del Río
Keyword(s):  
Precise Measurement ◽  
Form Factors ◽  
Transition Form

The KLOE results on the measurement of the transition form factors of the η and π0 mesons in φ Dalitz decays are presented. Also we report in the determination of the Γ(η → γγ) in γγ collisions, for which KLOE has delivered the most precise measurement up to the date. The prospects for γγ physics of the upgraded detector KLOE-2, which is taking data aiming to collect more than 5 fb−1 by March 2018, are reviewed.

scholarly journals DISPERSION THEORY METHODS FOR TRANSITION FORM FACTORS

2014 ◽  
Vol 35 ◽  
pp. 1460461
Author(s):  
SEBASTIAN P. SCHNEIDER
Keyword(s):  
Form Factor ◽  
Form Factors ◽  
Transition Form ◽  
Dispersion Theory ◽  
Stepping Stones ◽  
Independent Determination ◽  
Model Independent ◽  
Scattering Contribution ◽  
Theoretical Analyses

Dispersion-theoretical analyses of transition form factors are stepping stones to a model-independent determination of the light-by-light scattering contribution to (g - 2)μ. We extend a calculation of the conversion decays of the lightest isoscalar vector mesons, ω/ϕ → π0ℓ+ℓ-, that builds on a previous dispersive analysis of the ω/ϕ → 3π partial-wave amplitudes and the pion vector form factor as its sole ingredients. We construct a good parametrization of e+e- → 3π that, together with information on the anomalous process γπ → ππ, allows us to obtain a description of the π0 transition form factor measured in e+e- → π0γ.

scholarly journals Effects of Flavor Dependence on Weak Decays ofJ/ψandϒ

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Rohit Dhir ◽  
R. C. Verma ◽  
Avinash Sharma
Keyword(s):  
Detailed Analysis ◽  
Form Factors ◽  
Branching Ratios ◽  
Hadronic Decays ◽  
Cabibbo Angle ◽  
Transition Form ◽  
Factorization Scheme ◽  
Weak Decays ◽  
Quark Momentum

We carry out a detailed analysis of effects of flavor dependence of average transverse quark momentum inside a meson onJ/ψ→Pandϒ→Bctransition form factors and two-body weak hadronic decays ofJ/ψandϒemploying the factorization scheme. We predict the branching ratios of semileptonic and nonleptonic weak decays ofJ/ψandϒmesons in Cabibbo-angle-enhanced and Cabibbo-angle-suppressed modes.

scholarly journals On the transition form factors of the axial-vector resonance f1(1285) and its decay into e+e−

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Marvin Zanke ◽  
Martin Hoferichter ◽  
Bastian Kubis
Keyword(s):  
Light Scattering ◽  
Axial Vector ◽  
Form Factors ◽  
Comprehensive Analysis ◽  
Vector Meson Dominance ◽  
Transition Form ◽  
Vector Resonance ◽  
The Impact ◽  
First Time

Abstract Estimating the contribution from axial-vector intermediate states to hadronic light-by-light scattering requires input on their transition form factors (TFFs). Due to the Landau–Yang theorem, any experiment sensitive to these TFFs needs to involve at least one virtual photon, which complicates their measurement. Phenomenologically, the situation is best for the f1(1285) resonance, for which information is available from e+e− → e+e−f1, f1 → 4π, f1 → ργ, f1 → ϕγ, and f1 → e+e−. We provide a comprehensive analysis of the f1 TFFs in the framework of vector meson dominance, including short-distance constraints, to determine to which extent the three independent TFFs can be constrained from the available experimental input — a prerequisite for improved calculations of the axial-vector contribution to hadronic light-by-light scattering. In particular, we focus on the process f1 → e+e−, evidence for which has been reported recently by SND for the first time, and discuss the impact that future improved measurements will have on the determination of the f1 TFFs.

scholarly journals Resonances from lattice QCD

2018 ◽  
Vol 175 ◽  
pp. 01016 ◽  
Author(s):  
Raúl A. Briceño
Keyword(s):  
Lattice Qcd ◽  
Finite Volume ◽  
Present Status ◽  
Form Factors ◽  
Matrix Elements ◽  
Transition Form ◽  
Recent Calculation ◽  
The Masses

The spectrum of hadron is mainly composed as shortly-lived states (resonance) that decay onto two or more hadrons. These resonances play an important role in a variety of phenomenologically significant processes. In this talk, I give an overview on the present status of a rigorous program for studying of resonances and their properties using lattice QCD. I explain the formalism needed for extracting resonant amplitudes from the finite-volume spectra. From these one can extract the masses and widths of resonances. I present some recent examples that illustrate the power of these ideas. I then explain similar formalism that allows for the determination of resonant electroweak amplitudes from finite-volume matrix elements. I use the recent calculation of the πγ* → ππ amplitude as an example illustrating the power of this formalism. From such amplitudes one can determine transition form factors of resonances. I close by reviewing on-going efforts to generalize these ideas to increasingly complex reactions and I then give a outlook of the field.

NMR Determination of the Structure of Peracetylated Icariside B2 from Veratrum Lobelianum BERNH.

1995 ◽  
Vol 60 (8) ◽  
pp. 1380-1385 ◽  
Author(s):  
Václav Suchý ◽  
Miloš Buděšínský ◽  
Karel Ubik ◽  
Daniel Grančai ◽  
Vlasta Földešiová
Keyword(s):  
Detailed Analysis ◽  
Nmr Spectra ◽  
Aerial Part ◽  
C Nmr

rel(1S,4S,5R)-3,3,5-Trimethyl-4-[( 1E)-3-oxo-1-butenyl]-4,5-epoxy-cyclohexyl-O-β-D-glucopyranoside (I) was isolated from the aerial part of Veratrum lobelianum BERNH. The structure was derived mainly from detailed analysis of 1H and 13C NMR spectra of its acetylated derivative II. Compound I has been already reported under the name icariside B2in Epimedium grandiflorum MORR. var. thunbergianum (MIQ.) NAKAI.

scholarly journals Bs → Kℓv form factors with 2+1 flavors

2018 ◽  
Vol 175 ◽  
pp. 13008 ◽  
Author(s):  
Yuzhi Liu ◽  
Jon A. Bailey ◽  
A. Bazavov ◽  
C. Bernard ◽  
C. M. Bouchard ◽  
...  
Keyword(s):  
Quark Mass ◽  
Strange Quark ◽  
Lattice Spacing ◽  
Light Quark ◽  
Form Factors ◽  
Ckm Matrix ◽  
Strange Quark Mass ◽  
Light Quark Mass ◽  
B Quark

Using the MILC 2+1 flavor asqtad quark action ensembles, we are calculating the form factors f0 and f+ for the semileptonic Bs → Kℓv decay. A total of six ensembles with lattice spacing from ≈ 0.12 to 0.06 fm are being used. At the coarsest and finest lattice spacings, the light quark mass m’l is one-tenth the strange quark mass m’s. At the intermediate lattice spacing, the ratio m’l/m’s ranges from 0.05 to 0.2. The valence b quark is treated using the Sheikholeslami-Wohlert Wilson-clover action with the Fermilab interpretation. The other valence quarks use the asqtad action. When combined with (future) measurements from the LHCb and Belle II experiments, these calculations will provide an alternate determination of the CKM matrix element |Vub|.

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