Study of the electromagnetic transition form-factors in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>η</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>μ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>μ</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mi>γ</mml:mi></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" overflow="scroll"><mml:mi>ω</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>μ</mml:mi><mml:mo>+</mml:mo></mml

Arnaldi, R.; Banicz, K.; Castor, J.; Chaurand, B.; Cicalò, C.; Colla, A.; Cortese, P.; Damjanović, S.; David, A.; Falco, A. De; Devaux, A.; Ducroux, L.; En’yo, H.; Fargeix, J.; Ferretti, A.; Floris, M.; Förster, A.; Force, P.; Guettet, N.; Guichard, A.; Gulkanian, H.; Heuser, J. M.; Keil, M.; Lourenço, C.; Lozano, J.; Manso, F.; Martins, P.; Masoni, A.; Neves, A.; Ohnìshì, H.; Oppedisano, C.; Parracho, P. G. Ferreira; Pillot, P.; Poghosyan, T.; Puddu, G.; Radermacher, E.; Ramalhete, P.; Rosinský, P.; Scomparin, E.; Seixas, J.; Serci, S.; Shahoyan, R.; Sonderegger, P.; Specht, H. J.; Tieulent, R.; Usai, G. L.; Veenhof, R.; Wöhri, H. K.

doi:10.1016/j.physletb.2009.05.029

Cited by 139 publications

(112 citation statements)

References 19 publications

Supporting

Mentioning

102

Contrasting

Unclassified

Order By: Relevance

“…(35), which reflects the fact that the chiral symmetry relates the ω-π 0 -γ process with the ω-Z-γ process through the Ward-Takahashi identity in Eq.(43). Performing the fit to the experimental data on F ωπ 0 measured at the NA60 experiment [19], we find the best fit value ofc (with χ 2 /d.o.f = 4.3/13 = 0.33),c…”

Section: Application To Neutrino-nucleon Collision Processesmentioning

confidence: 96%

See 1 more Smart Citation

Anomalousω-Z-γvertex from hidden local symmetry

2011

View full text Add to dashboard Cite

We formulate the general form of ω-Z-γ vertex in the framework based on the hidden local symmetry (HLS), which arises from the gauge invariant terms for intrinsic parity-odd (IP-odd) part of the effective action. Those terms are given as the homogeneous part of the general solution (having free parameters) to the Wess-Zumino (WZ) anomaly equation and hence are not determined by the anomaly, in sharp contrast to the Harvey-Hill-Hill (HHH) action where the relevant vertex is claimed to be uniquely determined by the anomaly. We show that, even in the framework that HHH was based on, the ω-Z-γ vertex is actually not determined by the anomaly but by the homogeneous (anomaly-free) part of the general solution to the WZ anomaly equation having free parameters in the same way as in the HLS formulation: The HHH action is just a particular choice of the free parameters in the general solution. We further show that the ω-Z-γ vertex related to the neutrino (ν) -nucleon (N ) scattering cross section σ(νN → νN (N ′ )γ) is determined not by the anomaly but by the anomaly-free part of the general solution having free parameters. Nevertheless we find that the cross section σ(νN → νN (N ′ )γ) is related through the Ward-Takahashi identity to Γ(ω → π 0 γ) which has the same parameter-dependence as that of σ(νN → νN (N ′ )γ) and hence the ratio σ(νN → νN (N ′ )γ)/Γ(ω → π 0 γ) is fixed independently of these free parameters. Other set of the free parameters of the general solution can be fixed to make the best fit of the ω → π 0 l + l − process, which substantially differs from the HHH action. This gives a prediction of the cross section σ(νN → νN (N ′ )γ * (l + l − )) to be tested at ν-N collision experiments in the future.

show abstract

Section: Application To Neutrino-nucleon Collision Processesmentioning

confidence: 96%

“…(35) needs to be fixed. It turns out that thec can be determined by fitting the ω-π 0 transition form factor to the ω → π 0 l + l − decay data [19]: Consider the ω → π 0 l + l − decay width…”

Section: Application To Neutrino-nucleon Collision Processesmentioning

confidence: 99%

Anomalousω-Z-γvertex from hidden local symmetry

2011

View full text Add to dashboard Cite

show abstract

“…In both Equation 8 and Equation 9, Λ is the mass and width of the virtual vector meson, while γ is the width of the virtual vector meson. Recent measurements of the transition form factor for ω → μ + μ − π 0 have shown unexpected discrepancies with the Vector Dominance Model [8] and recent models of chiral Lagrangian field theory [9], and dispersion theory [10] attempt to predict the contributions of the virtual vector meson, as seen in Fig. 2.…”

Section: The Transition Form Factor Of the ω Mesonmentioning

confidence: 99%

“…Preliminary studies have shown that the number of ω → pe + e − π 0 events in CLAS to be ≈ 3 · 10 3 . Figure 2: Form factor of the decay ω → l + l − γ compared to dimuon data by the NA60 Collaboration [8,11] and LEPS [12]. Shown are VMD (dotted line) Eqs.…”

Section: The Transition Form Factor Of the ω Mesonmentioning

confidence: 99%

Light meson decays from photon-induced reactions with CLAS

Kunkel

2016

EPJ Web Conf.

View full text Add to dashboard Cite

Abstract. Photoproduction experiments with the CEBAF Large Acceptance Spectrometer CLAS at the Thomas Jefferson National Facility produce data sets with competitive statistics of light mesons. With these data sets, measurements of transition form factors for η, ω, and η mesons via conversion decays can be performed using the invariant mass distribution of the final state dileptons. Tests of fundamental symmetries and information on the light quark mass difference can be performed using a Dalitz plot analysis of the meson decay. An overview of preliminary results, from existing CLAS data, and future prospects within the newly upgraded CLAS12 apparatus are given.

show abstract

“…The SND collaboration also used the η → e + e − γ decay with significantly lower statistics [31] than from the Crystal Ball/TAPS measurement. The measurement of the NA60 collaboration [32] with 9 · 10 3 η → μ + μ − γ decays had the highest precision up to that date though this result has two major shortcomings. Due to the decay into muons the distribution only starts at q = 2m μ , and only the leptons were detected in their setup.…”

Section: η and η Cross Sectionsmentioning

confidence: 99%

ηandη′Physics at MAMI

Unverzagt

2014

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. The Crystal Ball/TAPS setup at MAMI is ideally suited to detect neutral and electromagnetic decays of the η and η mesons. In this contribution recent results on η and η decays from the Crystal Ball/TAPS experiment at MAMI are presented. These are the accurate measruement of η photoproduction cross-sections in the threshold region, the determination of the timelike electromagnetic transition form factors, and a test of low-energy QCD with the η → π 0 γγ decay. Finally, further perspectives are discussed.

show abstract

Study of the electromagnetic transition form-factors in η→μ+μ−γ and ω→μ+

Cited by 139 publications

References 19 publications

Anomalousω-Z-γvertex from hidden local symmetry

Anomalousω-Z-γvertex from hidden local symmetry

Light meson decays from photon-induced reactions with CLAS

ηandη′Physics at MAMI

Contact Info

Product

Resources

About