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Charge asymmetry in $e^+e^-\to \pi^+\pi^-$ process

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arxiv 2204.12235 v1 pith:EA5N7DZ2 submitted 2022-04-26 hep-ph hep-ex

classification hep-phhep-ex
keywords asymmetrycalculationschargedataexperimentalfindpionprocess
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We consider the charge asymmetry in the differential cross section of the process $e^+e^- \rightarrow \pi^+\pi^-$. Experimental data show large deviations from the results of the available theoretical calculations. Motivated by this fact, we revisit the contribution of the two photon exchange diagrams and find the origin of discrepancy in an oversimplified account of the pion internal structure in the theoretical calculations. We present a natural and simple approach that accounts for the pion structure in a more consistent way and find remarkable agreement with the experimental data.

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Cited by 3 Pith papers

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

  1. Radiative return at NLOPS accuracy

    hep-ph 2026-01 conditional novelty 7.0 of 10

    First implementation of NLO corrections matched to a parton shower for the radiative processes e+e−→π+π−γ and e+e−→μ+μ−γ, including ISR, FSR and their interference.

  2. Next-to-leading order FsQED corrections to radiative pion pair production

    hep-ph 2026-07 conditional novelty 6.0 of 10

    FsQED NLO structure-dependent corrections to radiative pion-pair production are at the permille (mass) to percent (angular/AFB) level, agree with GVMD, and are now in BabaYaga@NLO.

  3. Fast evaluation of Feynman integrals for Monte Carlo generators

    hep-ph 2025-07 conditional novelty 6.0 of 10

    A new numerical integrator evaluates one- and two-loop five-point Feynman integrals with complex masses in milliseconds, using variable-by-variable integration and a new branch-cut prescription.

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