Kloe Results on Η and Η' Physics

Ambrosino, F.; Antonelli, A.; Antonelli, M.; Bacci, C.; Beltrame, P.; Bencivenni, G.; Bertolucci, S.; Bini, C.; Bloise, C.; Bocchetta, S. S.; Bocci, V.; Bossi, F.; Bowring, D.; Branchini, P.; Caloi, R.; Campana, P.; Capon, G.; Capussela, T.; Ceradini, F.; Chi, S.; Chiefari, G.; Ciambrone, P.; Conetti, S.; Lucia, E. De; Santis, A. De; Simone, P. De; Zorzi, G. De; Dell’Agnello, S.; Denig, A.; Domenico, A. Di; Donato, C. Di; Falco, S. Di; Micco, B. Di; Doria, A.; Dreucci, M.; Felici, G.; Ferrari, A.; Ferrer, M. L.; Finocchiaro, G.; Fiore, S.; Forti, C.; Franzini, P.; Gatti, C.; Gauzzi, P.; Giovannella, S.; Graziani, E.; Incagli, M.; Kluge, W.; Kulikov, V.; Lacava, F.; Lanfranchi, G.; Lee‐Franzini, J.; Leone, D.; Martini, M.; Massarotti, P.; Mei, W.; Meola, S.; Miscetti, S.; Moulson, M.; Müller, Steffen; Murtas, F.; Napolitano, M.; Nguyen, F.; Palutan, M.; Passeri, A.; Patera, V.; Perfetto, F.; Pontecorvo, L.; Primavera, M.; Santangelo, P.; Santovetti, E.; Saracino, G.; Sciascia, B.; Sciubba, A.; Scuri, F.; Sfiligoi, I.; Spadaro, T.; Testa, M.; Tortora, L.; Valente, P.; Valeriani, B.; Venanzoni, G.; Veneziano, S.; Ventura, A.; Versaci, R.; Xu, G.

doi:10.1142/9789812790873_0204

Cited by 28 publications

(59 citation statements)

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“…We do not carry out this task in this paper but simply state that it is perhaps more likely that dynamical spin effects are also maximal in the η as revealed by the spacelike transition form factor data which span a wider kinematical range: 4 GeV 2 < Q 2 < 40 GeV 2 than the single radiative decay width datum which is sensitive to the transition form factor at Q 2 = 0. However, in our present analysis, we have completely ignored the possible effects of gluonic or charm components in the η ′ [34,[82][83][84][85][86][87][88][89]. A fuller analysis is required to arrive at a definite conclusion.…”

Section: Transition Form Factorsmentioning

confidence: 99%

Dynamical spin effects in the holographic light-front wavefunctions of light pseudoscalar mesons

2018

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We quantify the importance of dynamical spin effects in the holographic light-front wavefunctions of the pion, kaon, η and η ′ . Using a universal AdS/QCD scale and constituent quark masses, we find that such effects are maximal in the pion where they lead to an excellent simultaneous description of a wide range of data: the decay constant, charge radius, spacelike EM and transition form factors, as well as, after QCD evolution, both the parton distribution function and the parton distribution amplitude data from Fermilab. These dynamical spin effects lead up to a 30% chance of finding the valence quark and antiquark with aligned spins in the pion. The situation is very different for the kaon, where a simultaneous description of the available data (decay constant, radius and spacelike EM form factor) prefer no dynamical spin effects at all. The situation is less clear for the η and η ′ : while their radiative decay widths data are consistent with dynamical spin effects only in η ′ , the data on their spacelike transition form factors clearly favor maximal dynamical spin effects in both mesons.

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Section: Transition Form Factorsmentioning

confidence: 99%

Dynamical spin effects in the holographic light-front wavefunctions of light pseudoscalar mesons

2018

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“…Note, in the case of pseudoscalar mesons we introduce singlet-octet mixing with a mixing angle of θ P = −13.34 • deduced from Ref. [35] (see details in Refs. [21,23]) while the vector mesons are assumed to be ideally mixed:…”

Section: Model Parametersmentioning

confidence: 99%

Nonleptonic two-body decays of single heavy baryons ΛQ , ΞQ , and Ω
Gutsche
¹
,
Ivanov
²
,
Körner
³

et al. 2018
Phys. Rev. D
49
5
22
0
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We have made a survey of heavy-to-heavy and heavy-to-light nonleptonic heavy baryon two-body decays and have identified those decays that proceed solely via W -boson emission, i.e. via the tree graph contribution. Some sample decays areand Λc → pφ. We make use of the covariant confined quark model previously developed by us to calculate the tree graph contributions to these decays. We calculate rates, branching fractions and, for some of these decays, decay asymmetry parameters. We compare our results to experimental findings and the results of other theoretical approaches when they are available. Our main focus is on decays to final states with a lepton pair because of their clean experimental signature. For these decays we discuss two-fold polar angle decay distributions such as in the cascade decay Ω − b → Ω − (→ Ξπ, ΛK − ) + J/ψ(→ ℓ + ℓ − ). Lepton mass effects are always included in our analysis.

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“…A good fit can be obtained with θ P ≈ −10.9 ± 0.5 • , which is compatible with the determinations in Refs. [3,[63][64][65]. However, the resulting decay widths involving η ′ , Γ η ′ →ργ , Γ η ′ →ωγ and Γ φ→η ′ γ , are now deviated about 30-60 percents from the previous determinations in Ref.…”

Section: A Fit To Experimental Datamentioning

confidence: 98%

Amplitude analysis of the anomalous decay η′→π+π−γ

et al. 2018

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In this paper we perform an amplitude analysis of η ′ → π + π − γ and confront it with the latest BESIII data. Based on the final-state interaction theorem, we represent the amplitude in terms of an Omnés function multiplied by a form factor that corresponds to the contributions from left-hand cuts and right-hand cuts in the inelastic channels. We also take into account the isospin violation effect induced by ρ − ω mixing. Our results show that the anomaly contribution is mandatory in order to explain the data. Its contribution to the decay width of Γ(η ′ → ππγ) is larger than that induced by isospin violation. Finally we extract the pole positions of the ρ and ω as well as their corresponding residues.

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Kloe Results on Η and Η' Physics

Cited by 28 publications

References 0 publications

Dynamical spin effects in the holographic light-front wavefunctions of light pseudoscalar mesons

Dynamical spin effects in the holographic light-front wavefunctions of light pseudoscalar mesons

Nonleptonic two-body decays of single heavy baryons ΛQ , ΞQ , and Ω
Gutsche
¹
,
Ivanov
²
,
Körner
³

et al. 2018
Phys. Rev. D
49
5
22
0
View full text Add to dashboard Cite

Amplitude analysis of the anomalous decay η′→π+π−γ

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Kloe Results on Η and Η' Physics

Cited by 28 publications

References 0 publications

Dynamical spin effects in the holographic light-front wavefunctions of light pseudoscalar mesons

Dynamical spin effects in the holographic light-front wavefunctions of light pseudoscalar mesons

Nonleptonic two-body decays of single heavy baryons ΛQ , ΞQ , and ΩGutsche1, Ivanov2, Körner3 et al. 2018Phys. Rev. D495220View full textAdd to dashboardCite

Amplitude analysis of the anomalous decay η′→π+π−γ

Contact Info

Product

Resources

About

Nonleptonic two-body decays of single heavy baryons ΛQ , ΞQ , and Ω
Gutsche
¹
,
Ivanov
²
,
Körner
³

et al. 2018
Phys. Rev. D
49
5
22
0
View full text Add to dashboard Cite