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Measurement of the γ^(star)γ^(star) to η' transition form factor

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arxiv 1808.08038 v2 pith:5JNP3MYO submitted 2018-08-24 hep-ex

Measurement of the γ^(star)γ^(star) to η' transition form factor

classification hep-ex
keywords gammastarfactorformtransitionanalysisaroundbabar
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study the process $e^+e^-\to e^+e^- \eta'$ in the double-tag mode and measure for the first time the $\gamma^{\star}\gamma^{\star} \to \eta'$ transition form factor $F_{\eta'}(Q_1^2, Q_2^2)$ in the momentum-transfer range \mbox{2 $<Q_1^2, Q_2^2<$ 60 GeV$^2$}. The analysis is based on a data sample corresponding to an integrated luminosity of around 469 fb$^{-1}$ collected at the PEP-II $e^+e^-$ collider with the BaBar detector at center-of-mass energies near 10.6 GeV.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. HadroTOPS: A Monte Carlo Event Generator For Hadron Production In Two-Photon Scattering In Electron Positron Collisions

    hep-ph 2025-11 conditional novelty 6.0

    A new Monte Carlo generator, HadroTOPS, implements the fully differential exclusive e+e- -> e+e- M1M2 cross-section with azimuthal modulations and covers pi+pi-, pi0pi0, pi0eta, K+K-, KsKs, eta eta, and f1(1285) modes.

  2. Improved Standard-Model predictions for $\eta^{(\prime)}\to \ell^+ \ell^-$

    hep-ph 2025-12 accept novelty 5.0

    Updated SM predictions yield Br(η→e⁺e⁻)=5.37(4)(2)[4]×10⁻⁹, Br(η→μ⁺μ⁻)=4.54(4)(2)[4]×10⁻⁶, Br(η'→e⁺e⁻)=1.80(2)(3)[3]×10⁻¹⁰, and Br(η'→μ⁺μ⁻)=1.22(2)(2)[3]×10⁻⁷, with a mild 1.6σ tension in the η→μ⁺μ⁻ channel.

  3. The anomalous magnetic moment of the muon in the Standard Model

    hep-ph 2020-06 accept novelty 2.0

    The Standard Model value for the muon anomalous magnetic moment is 116591810(43)×10^{-11}, 3.7σ below the Brookhaven experimental measurement.