Resonances contribution to two-photon exchange effects and possible large forward-backward asymmetry in $e^+ e^- \rightarrow p \bar{p}$

Hai-Qing Zhou; Bing-Song Zou

doi:10.1016/j.nuclphysa.2012.04.004

Resonances contribution to two-photon exchange effects and possible large forward-backward asymmetry in $e^+ e^- \rightarrow p \bar{p}$

High Energy Physics - Phenomenology 2015-06-03 v2

Authors: Hai-Qing Zhou , Bing-Song Zou

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Abstract

The resonances ( $\eta_c,\chi_{c0,c2}$ ) contribution to two-photon exchange (TPE) effects in $e^+ e^- \leftrightarrow p \bar{p}$ is calculated in a simple hadronic model. The calculation shows the TPE contributions by resonance $\chi_{c2}$ , which are dependent on the unknown phases $\phi_{E,M}$ of proton's time-like form factors $G_{E,M}$ , are much larger than the TPE contributions by non-resonance and are comparable with measurement precision of coming PANDA detector at $\sqrt{s} \sim M_{\chi_{c2}}$ for most $\phi_{E,M}$ .

Keywords

two-photon exchange forward-backward asymmetry proton time-like form factors resonance contribution hadronic model

Cite

@article{arxiv.1112.4615,
  title  = {Resonances contribution to two-photon exchange effects and possible large forward-backward asymmetry in $e^+ e^- \rightarrow p \bar{p}$},
  author = {Hai-Qing Zhou and Bing-Song Zou},
  journal= {arXiv preprint arXiv:1112.4615},
  year   = {2015}
}

Comments

8 pages, 6 figures; a global factor in the calculation is corrected

Resonances contribution to two-photon exchange effects and possible large forward-backward asymmetry in $e^+ e^- \rightarrow p \bar{p}$

Abstract

Keywords

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