MesonNet 2013 International Workshop. Mini-proceedings

Amaryan, M. J.; Bashkanov, M.; Benayoun, M.; Bergmann, F. S.; Bijnens, Johan; Balkeståhl, L. Caldeira; Clement, H.; Colangelo, Gilberto; Daub, Johanna T.; Eidelman, S.; Fang, S. S.; Gajos, A.; Giovannella, S.; Goudzovski, E.; Grzonka, D.; Gullström, C.–O.; Gumberidze, M.; Heijkenskjöld, L.; Hejny, V.; Hoferichter, Martin; Husek, T.; Ikeno, N.; Ivashyn, S.; Johansson, T.; Kadavý, Tomáš; Kampf, Karol; Kolesár, Marián; Kupść, A.; Lang, Matthew; Lorenz, M.; Lutz, M. F. M.; Machner, H.; Masjuan, Pere; Metag, V.; Moussallam, B.; Nagahiro, Hideko; Nanova, M.; Niecknig, Franz; Papenbrock, M.; Peña, M. T.; Pettersson, J.; Longhi, I. Prado; Prencipe, E.; Balwierz-Pytko, I.; Przygoda, W.; Redmer, C. F.; Sarra, I.; Sawant, Sharadkumar Pralhad; Schneider, S.; Shwartz, B.; Skurzok, M.; Tanaka, Yasuhiro; Terschlüsen, Carla; Unverzagt, M.; Yamagata-Sekihara, J.; Zdrahal, Martin; Zétényi, M.

doi:10.48550/arxiv.1308.2575

Cited by 8 publications

(9 citation statements)

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“…Although the later data of BELLE Collaboration [14] are quite consistent with the conventional theoretical approach, the controversy remains [15]. The expected high-precision data from BES-III [16,17], KLOE-2 [18] (in the space-like region, q 2 < 0) and CLAS [19,20] (in the time-like region, q 2 > 0) as well as further theoretical investigations (especially those valid in both regions) will give us a more complete understanding of the meson TFFs.…”

Section: Introductionmentioning

confidence: 92%

Axial anomaly and vector meson dominance model

2014

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The dispersive representation of axial anomaly leads to the anomaly sum rules (ASRs), exact nonperturbative relations in QCD. The analytical continuation of the ASRs to the time-like region is performed. The transition form factors of $\pi^0$, $\eta$ and $\eta'$ mesons in this region are calculated. A good agreement with the available experimental data is found. Based on the ASRs, we have provided the foundations for the vector meson dominance model in these processes.Comment: 13 pages, 4 figure

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Section: Introductionmentioning

confidence: 92%

Axial anomaly and vector meson dominance model

2014

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“…Furthermore, there are ongoing and proposed experiments to test the remaining green band and other parameter space. CERN NA48/2 experimental data (Dalitz decays of π 0 from K ± → π ± π 0 ) are under analysis and their sensitivity can cover ε 2 several ×10 −7 [30]. There are direct dark photon searches which use an electron beam with a fixed target of typically high atomic number [20] to produce Z d s. The radiated dark photon can decay into a dilepton forming a resonance over the smooth SM offshell photon background (γ * → e + e − ).…”

Section: And |ε|mentioning

confidence: 99%

Muong−2, rare kaon decays, and parity violation from dark bosons

2014

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The muon g μ − 2 discrepancy between theory and experiment may be explained by a light vector boson Z d that couples to the electromagnetic current via kinetic mixing with the photon. We illustrate how the existing electron g e − 2, pion Dalitz decay, and other direct production data disfavor that explanation if the Z d mainly decays into e þ e − , μ þ μ − . Implications of a dominant invisible Z d decay channel, such as light dark matter, along with the resulting strong bounds from the rare K → π + missing energy decay are examined. The K decay constraints may be relaxed if destructive interference effects due to Z − Z d mass mixing are included. In that scenario, we show that accommodating the g μ − 2 data through relaxation of K decay constraints leads to interesting signals for dark parity violation. As an illustration, we examine the alteration of the weak mixing angle running at low Q 2 , which can be potentially observable in polarized electron scattering or atomic physics experiments.

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“…In an initial exploration of this question, the authors of Ref. [38,39] (see also [40]) included the operators in Eq. ( 1) in Π µναβ (q, k 2 , k 3 , k 4 ), where q and the k j are the real and virtual photon momenta, respectively, with k 4 = −(q + k 2 + k 3 ).…”

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confidence: 99%

The muon anomalous magnetic moment and the pion polarizability

Engel

Ramsey-Musolf

2014

Physics Letters B

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We compute the charged pion loop contribution to the muon anomalous magnetic moment a μ , taking into account the previously omitted effect of the charged pion polarizability, (α 1 − β 1 ) π + . We evaluate this contribution using two different models that are consistent with the requirements of chiral symmetry in the low-momentum regime and perturbative quantum chromodynamics in the asymptotic region. The result may increase the disagreement between the present experimental value for a μ and the theoretical, Standard Model prediction by as much as ∼ 60 × 10 −11 , depending on the value of (α 1 − β 1 ) π + and the choice of the model. The planned determination of (α 1 − β 1 ) π + at Jefferson Laboratory will eliminate the dominant parametric error, leaving a theoretical model uncertainty commensurate with the error expected from planned Fermilab measurement of a μ .

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MesonNet 2013 International Workshop. Mini-proceedings

Cited by 8 publications

References 0 publications

Axial anomaly and vector meson dominance model

Axial anomaly and vector meson dominance model

Muong−2, rare kaon decays, and parity violation from dark bosons

The muon anomalous magnetic moment and the pion polarizability

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