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Blok, H. P.; Horn, T.; Huber, G. M.; Beise, E. J.; Gaskell, D.; Mack, D.; Tadevosyan, V.; Volmer, J.; Abbott, D.; Aniol, K.; Anklin, H.; Armstrong, Christopher; Arrington, J.; Assamagan, K.; Avery, S.; Baker, O. K.; Barrett, B.; Bochna, C.; Boeglin, W.; Brash, E. J.; Breuer, H.; Chang, C. C.; Chant, N. S.; Christy, M. E.; Dunne, J.; Eden, T.; Ent, R.; Fenker, H.; Gibson, E. F.; Gilman, R.; Gustafsson, K.; Hinton, W.; Holt, R. J.; Jackson, H. E.; Jin, S.; Jones, M.; Keppel, C.; Kim, P. H.; Kim, W.; P, King; Klein, A.; Koltenuk, D.; Kovaltchouk, V.; Liang, M.; Liu, J.; Lolos, G. J.; Lung, A.; Margaziotis, D. J.; Markowitz, P.; Matsumura, Akihiko; McKee, D.; Meekins, D.; Mitchell, J.; Miyoshi, T.; Mkrtchyan, H.; Mueller, B.; Niculescu, G.; Niculescu, I.; Okayasu, Y.; Pentchev, L.; Perdrisat, C. F.; Pitz, D.; Potterveld, D. H.; Punjabi, V.; Qin, L. M.; Reimer, P. E.; Reinhold, J.; Roche, J.; Roos, P.G.; Sarty, A. J.; Shin, I. K.; Smith, G. R.; Stepanyan, S.; Tang, L.; Tvaskis, V.; Meer, R. L. J. van der; Vansyoc, K.; Westrum, Derek van; Vidakovic, S.; Vulcan, W.; Warren, G.; Wood, S. A.; Xu, Chang; Yan, Chao; Wenheng, Zhao; Zheng, X.; Zihlmann, B.

doi:10.1103/physrevc.78.045202

Cited by 118 publications

(48 citation statements)

References 43 publications

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“…Experimentally, the available constraints derive from e + e − → π + π − data, which determine the time-like form factor [74][75][76][77][78][79], and space-like measurements by scattering pions off an electron target [80,81]. We have also checked that our representation is consistent with extractions of the space-like form factor from e − p → e − π + n data [82][83][84][85], although due to the remaining model dependence of extrapolating to the pion pole we do not use these data in our fits. To obtain a representation that allows us to simultaneously fit space--36 -…”

Section: Evaluation Of the Full Pion Boxsupporting

confidence: 59%

“…We find that the results for the space-like form factor are extremely stable to all these variations, the largest effect being produced by the differences s GeV 2 | | Figure 11. Left: space-like pion form factor from our dispersive fit in comparison to data from NA7 [81] and JLab [83][84][85] (the latter are not included in the fit). The error band represents the variation observed between different time-like data sets.…”

Section: Jhep04(2017)161mentioning

confidence: 99%

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Dispersion relation for hadronic light-by-light scattering: two-pion contributions

Colangelo

Hoferichter

Procura

et al. 2017

J. High Energ. Phys.

385

257

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In this third paper of a series dedicated to a dispersive treatment of the hadronic light-by-light (HLbL) tensor, we derive a partial-wave formulation for two-pion intermediate states in the HLbL contribution to the anomalous magnetic moment of the muon (g − 2) µ , including a detailed discussion of the unitarity relation for arbitrary partial waves. We show that obtaining a final expression free from unphysical helicity partial waves is a subtle issue, which we thoroughly clarify. As a by-product, we obtain a set of sum rules that could be used to constrain future calculations of γ * γ * → ππ. We validate the formalism extensively using the pion-box contribution, defined by two-pion intermediate states with a pion-pole left-hand cut, and demonstrate how the full known result is reproduced when resumming the partial waves. Using dispersive fits to high-statistics data for the pion vector form factor, we provide an evaluation of the full pion box, a π-box µ = −15.9(2)×10 −11 . As an application of the partial-wave formalism, we present a first calculation of ππ-rescattering effects in HLbL scattering, with γ * γ * → ππ helicity partial waves constructed dispersively using ππ phase shifts derived from the inverse-amplitude method. In this way, the isospin-0 part of our calculation can be interpreted as the contribution of the f 0 (500) to HLbL scattering in (g − 2) µ . We argue that the contribution due to charged-pion rescattering implements corrections related to the corresponding pion polarizability and show that these are moderate. Our final result for the sum of pion-box contribution and its S-wave rescattering corrections reads a π-box µ + a ππ,π-pole LHC µ,J=0 = −24(1) × 10 −11 .

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Section: Evaluation Of the Full Pion Boxsupporting

confidence: 59%

Section: Jhep04(2017)161mentioning

confidence: 99%

Dispersion relation for hadronic light-by-light scattering: two-pion contributions

Colangelo

Hoferichter

Procura

et al. 2017

J. High Energ. Phys.

385

257

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“…In π + n electroproduction, hadronic models like the VGL model cannot account for the anomalously large σ T above the resonance region [1]. A similar scenario is expected in highenergy K + Λ electroproduction.…”

Section: B Resultsmentioning

confidence: 83%

“…Above the resonance region, the transverse cross section σ T measured in charged-pion electroproduction is significantly larger than predicted by regular hadronic models [1]. In Ref.…”

Section: Introductionmentioning

confidence: 88%

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K+Λelectroproduction above the resonance region

2014

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Background:In π + n and π − p electroproduction, conventional models cannot satisfactorily explain the data above the resonance region, in particular the transverse cross section. Although no high-energy L-T-separated cross-section data are available to date, a similar scenario can be inferred for K + Λ electroproduction. Purpose: Develop a phenomenological model for the p(γ * ,K + )Λ reaction at forward angles and high-energies. Propose a universal framework for interpreting charged-kaon and charged-pion electroproduction above the resonance region. Method: Guided by the recent model for charged-pion electroproduction, developed by the authors, a framework for K + Λ electroproduction at high energies and forward angles is constructed. To this end, a Reggeized background model for K + Λ photoproduction is first developed. This model is used as a starting base to set up an electroproduction framework. Results: The few available data of the unseparated p(γ * ,K + )Λ cross section are well explained by the model. Predictions for the L-T-separation experiment planned with the 12 GeV upgrade at Jefferson Lab are given. The newly proposed framework predicts an increased magnitude for the transverse structure function, similar to the situation in charged-pion electroproduction. Conclusions: Within a hadronic framework featuring Reggeized background amplitudes, s-channel resonanceparton effects can explain the observed magnitude of the unseparated p(γ * ,K + )Λ cross section at high energies and forward angles. Thereby, no hardening of the kaon electromagnetic form factor is required.

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Hard Exclusive Pion Leptoproduction

Kroll

2016

Few-Body Syst

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In this talk it is reported on an analysis of hard exclusive leptoproduction of pions within the handbag approach. It is argued that recent measurements of this process performed by HERMES and CLAS clearly indicate the occurrence of strong contributions from transversely polarized photons. Within the handbag approach such γ * T → π transitions are described by the transversity GPDs accompanied by twist-3 pion wave functions. It is shown that the handbag approach leads to results on cross sections and single-spin asymmetries in fair agreement with experiment. Predictions for other pseudoscalar meson channels are also briefly discussed.

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Charged pion form factor betweenQ2=0.60and 2.45GeV2. I. Me

Cited by 118 publications

References 43 publications

Dispersion relation for hadronic light-by-light scattering: two-pion contributions

Dispersion relation for hadronic light-by-light scattering: two-pion contributions

K+Λelectroproduction above the resonance region

Hard Exclusive Pion Leptoproduction

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