English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

KLOE and Babar have an observed discrepancy of 2% to 5% in the invariant pionpair production cross section. These measurements are based on approximate NLO$ \mu^+ \mu^- \gamma $ cross section predictions of the Monte Carlo eventgenerator PHOKHARA7.0. In this article, the complete NLO radiative correctionsto $ \mu^+ \mu^- \gamma $ production are calculated and implemented in theMonte Carlo event generator PHOKHARA9.0. Numerical reliability is guaranteed bytwo independent approaches to the real and the virtual corrections. The novelfeatures include the contribution of pentagon diagrams in the virtualcorrections, which form a gauge-invariant set when combined with their boxdiagram partners. They may contribute to certain distributions at the percentlevel. Also the real emission was complemented with two-photon final stateemission contributions not included in the generator PHOKHARA7.0. Wedemonstrate that the numerical influence reaches, for realistic charge-averagedexperimental setups, not more than 0.1% at KLOE and 0.3% at BaBar energies. Asa result, we exclude the approximations in earlier versions of PHOKHARA asorigin of the observed experimental discrepancy.

Complete QED NLO contributions to the reaction $e^+e^- \to \mu^+\mu^-\gamma$ and their implementation in the event generator PHOKHARA