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Measurement of the gamma gamma -> pi+ pi- and gamma gamma -> K+ K- processes at energies of 2.4 - 4.1 GeV

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arxiv hep-ex/0412058 v2 pith:J6O2HM4H submitted 2004-12-21 hep-ex

H. Nakazawa , et al. (for the Belle Collaboration) This is my paper
classification hep-ex
keywords gammacrossenergymeasuredrangegammagammagammagamma-production
verification ladder T0 review T1 audit T2 compute T3 formal
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We have measured pi+pi- and K+K- production in two-photon collisions using 87.7 /fb of data collected with the Belle detector at the asymmetric energy e+e- collider KEKB. The cross sections are measured to high precision in the two-photon center-of-mass energy (W) range between 2.4 GeV < W < 4.1 GeV and angular region |cos theta^{*}| < 0.6. The cross section ratio sigma(gammagamma->K+K-)/sigma(gammagamma->pi+pi-) is measured to be 0.89 +- 0.04(stat) +- 0.15(syst) in the range of 3.0 GeV < W < 4.1 GeV, where the ratio is energy independent. We observe a sin^{-4} theta^{*} behavior of the cross section in the same W range. Production of chi_{c0} and chi_{c2} mesons is observed in both gammagamma -> pi+pi- and gammagamma -> K+K- modes.

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Cited by 3 Pith papers

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

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    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. Twist-3 contributions to $\gamma\gamma\to\pi^0\pi^0,\,K_S^0K_S^0$ in $k_T$ factorization

    hep-ph 2026-06 unverdicted novelty 4.0 of 10

    Twist-3 LCDA contributions in k_T factorization dominate twist-2 for neutral channels, bringing predictions closer to data while neutral-to-charged ratios remain flat unlike observations.

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    hep-ph 2025-08 unverdicted novelty 3.0 of 10

    Improved tensor-pomeron model for π⁺π⁻ photoproduction and central exclusive production in pp collisions that accounts for different subenergies in the Drell-Söding contribution and yields larger cross sections with m...

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