6533b7d3fe1ef96bd1260992

RESEARCH PRODUCT

Dispersive analysis of the γγ⁎ → ππ process

Igor DanilkinMarc Vanderhaeghen

subject

PhysicsNuclear and High Energy PhysicsParticle physicsMuonUnitarityAnomalous magnetic dipole momentScatteringDispersion relationHadronInvariant massResonance (particle physics)lcsh:Physicslcsh:QC1-999

description

Abstract We present a theoretical study of the γ γ ⁎ → π + π − , π 0 π 0 processes from the threshold through the f 2 ( 1270 ) region in the ππ invariant mass. We adopt the Omnes representation in order to account for rescattering effects in both s- and d-partial waves. For the description of the f 0 ( 980 ) resonance, we implement a coupled-channel unitarity. The constructed amplitudes serve as an essential framework to interpret the current experimental two-photon fusion program at BESIII. They also provide an important input for the dispersive analyses of the hadronic light-by-light scattering contribution to the muon's anomalous magnetic moment.

yearjournalcountryeditionlanguage
2019-02-01Physics Letters B
10.1016/j.physletb.2018.12.047http://www.sciencedirect.com/science/article/pii/S037026931830981X