scholarly journals Updated pseudoscalar contributions to the hadronic light-by-light of the muon (g − 2)

2016 ◽  
Vol 31 (31) ◽  
pp. 1630034 ◽  
Author(s):  
Pablo Sanchez-Puertas ◽  
Pere Masjuan
Keyword(s):  
Systematic Uncertainty ◽  
Form Factors ◽  
Data Driven ◽  
Rational Approach ◽  
Transition Form ◽  
Pole Contribution ◽  
Model Independent ◽  
First Time

In this work, we present our recent results on a new and alternative data-driven determination for the hadronic light-by-light pseudoscalar pole contribution to the muon (g − 2). Our approach is based on Canterbury approximants, a rational approach to describe the required transition form factors, which provides a systematic and model-independent framework beyond traditional large-[Formula: see text] approaches. As a result, we obtain a competitive determination with errors according to future (g − 2) experiments including, for the first time, a well-defined systematic uncertainty.

scholarly journals A RATIONAL APPROACH TO η AND η′ TRANSITION FORM FACTORS

2014 ◽  
Vol 35 ◽  
pp. 1460398
Author(s):  
RAFEL ESCRIBANO
Keyword(s):  
Experimental Data ◽  
Form Factors ◽  
Rational Approach ◽  
Transition Form ◽  
Rational Approximants ◽  
Intermediate Energies ◽  
Mixing Parameters ◽  
Model Independent ◽  
The Impact

The η and η′ transition form factors in the space-like region are analyzed at low and intermediate energies in a model-independent way through the use of rational approximants. The slope and curvature parameters of the form factors as well as their values at infinity are extracted from experimental data. The impact of these results on the mixing parameters of the η-η′ system are also discussed.

WEAK TRANSITION FORM FACTORS IN RARE HEAVY MESON DECAYS

1991 ◽  
Vol 06 (14) ◽  
pp. 1277-1284 ◽  
Author(s):  
Y.L. WU
Keyword(s):  
B Meson ◽  
Form Factors ◽  
Heavy Meson ◽  
Direct Application ◽  
Transition Form ◽  
B Meson Decays ◽  
Meson Decays ◽  
Weak Transition ◽  
Model Independent ◽  
General Relations

The transition form factors required for the rare heavy meson decays are evaluated. The model-independent absolutely normalized form factors, written in a compact form, among heavy to light and heavy to heavy meson transitions in the states such as 0−+→0−+, 1−, 0++, 1++ are given. A set of general relations among the form factors is obtained. The form factors involved in the rare B-meson decays are given as a direct application.

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 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.

MODEL INDEPENDENT CONSTRAINTS ON HADRON FORM FACTORS AT LARGE Q2 IN LIGHT-FRONT QCD

2014 ◽  
Vol 25 ◽  
pp. 1460047
Author(s):  
CHUENG-RYONG JI
Keyword(s):  
Hamiltonian Dynamics ◽  
Form Factors ◽  
Light Front ◽  
Large Momentum ◽  
First Principle ◽  
Transition Form ◽  
Front Form ◽  
Model Independent ◽  
Relativistic Hamiltonian Dynamics ◽  
Front Dynamics

Among the three forms of relativistic Hamiltonian dynamics proposed by Dirac in 1949, the front form has the largest number of kinematic generators. This distinction provides useful consequences in the analysis of physical observables in hadron physics. We discuss a rationale for using the front form dynamics, known nowadays as the light-front dynamics (LFD), and present a few explicit examples of hadron phenomenology that the front form uniquely can offer from the first principle QCD. In particular, model independent constraints are provided for the analyses of deuteron form factors and the NΔ transition form factors at large momentum transfer square Q2.

scholarly journals Progress in the Calculation of Nucleon Transition form Factors

2016 ◽  
Vol 57 (10) ◽  
pp. 965-973 ◽  
Author(s):  
Gernot Eichmann
Keyword(s):  
Form Factors ◽  
Transition Form

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 Electromagnetic transition form factors of baryons in a relativistic Faddeev approach

2018 ◽  
Vol 181 ◽  
pp. 01013 ◽  
Author(s):  
Reinhard Alkofer ◽  
Christian S. Fischer ◽  
Hèlios Sanchis-Alepuz
Keyword(s):  
Ground State ◽  
Bound States ◽  
Body Wave ◽  
Form Factors ◽  
Wave Functions ◽  
Electromagnetic Form Factors ◽  
Transition Form ◽  
Electromagnetic Transition ◽  
Three Body ◽  
Gluon Interaction

The covariant Faddeev approach which describes baryons as relativistic three-quark bound states and is based on the Dyson-Schwinger and Bethe-Salpeter equations of QCD is briefly reviewed. All elements, including especially the baryons’ three-body-wave-functions, the quark propagators and the dressed quark-photon vertex, are calculated from a well-established approximation for the quark-gluon interaction. Selected previous results of this approach for the spectrum and elastic electromagnetic form factors of ground-state baryons and resonances are reported. The main focus of this talk is a presentation and discussion of results from a recent investigation of the electromagnetic transition form factors between ground-state octet and decuplet baryons as well as the octet-only Σ0 to Λ transition.

scholarly journals Study of nonleptonic B(s)∗→ M1M2 (M = D,Ds,π,K) weak decays with factorization approach

2015 ◽  
Vol 30 (27) ◽  
pp. 1550162 ◽  
Author(s):  
Qin Chang ◽  
Pan-Pan Li ◽  
Xiao-Hui Hu ◽  
Lin Han
Keyword(s):  
Flavor Physics ◽  
Branching Fractions ◽  
Form Factors ◽  
Approximation Formula ◽  
Heavy Flavor ◽  
Transition Form ◽  
Factorization Approach ◽  
Decay Modes ◽  
Weak Decays ◽  
Belle Ii

Motivated by the experiments of heavy flavor physics at running LHC and upgrading SuperKEKB/Belle-II in the future, the nonleptonic [Formula: see text] [Formula: see text] weak decays are studied in this paper. The amplitudes are calculated with factorization approach, and the transition form factors [Formula: see text] are evaluated within BSW model. With the reasonable approximation [Formula: see text], our predictions of branching fractions are presented. Numerically, the CKM-favored tree-dominated [Formula: see text] and [Formula: see text] decays have the largest branching fractions of the order [Formula: see text], and hence will be firstly observed by forthcoming Belle-II experiment. However, most of the other decay modes have the branching fractions [Formula: see text] and thus are hardly to be observed soon. Besides, for the possible detectable [Formula: see text] decays with branching fractions [Formula: see text], some useful ratios, such as [Formula: see text], etc. are presented and discussed in detail.

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