Proposal for Studying $N^*$ Resonances with $\bar{p}p \to \bar{p}n π^+ $ Reaction

Details Proposal for Studying $N^*$ Resonances with $\bar{p}p \to \bar{p}n π^+ $ Reaction Proposal for Studying $N^*$ Resonances with $\bar{p}p \to \bar{p}n π^+ $ Reaction

2009-02-13

arxiv.org/abs/0902.2295v3

Phys.Rev.C80:045211,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 21 figures

Scientific paper

10.1103/PhysRevC.80.045211

A theoretical study of $\bar{p}p \to \bar{p}n \pi^+ $ reaction for anti-proton beam energy from 1 to 4 GeV is made by including contributions from various known $N^*$ and $\Delta^*$ resonances. It is found that for the beam energy around 1.5 GeV, the contribution of the Roper resonance $N^*_{(1440)}$ produced by the t-channel $\sigma$ exchange dominates over all other contributions. Since such reaction can be studied in the forthcoming $\bar{P}$ANDA experiment at Facility of Antiproton and Ion Research (FAIR), the reaction will be realistically the cleanest place for studying the properties of the Roper resonance and the best place for looking for other "missing" $N^*$ resonances with large coupling to $N\sigma$.

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