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

Abstract

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 $N^{\ast }$ and ${\Delta }^{\ast }$ resonances. It is found that for the beam energy around 1.5 GeV, the contribution of the Roper resonance $N_{(1440)}^{\ast }$ 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" $N^{\ast }$ resonances with large coupling to $N\sigma$.

18 pages, 21 figures

References in corpus (4)

• New results on the Roper resonance and the P_{11} partial wave
• The role of $N^{\ast }(1535)$ in $pp\to pp\varphi$ and ${\pi }^{-}p\to n\varphi$ reactions
• The role of ${\Delta }^{++\ast }(1620)$ resonances in $pp\to n{K}^{+}{\Sigma }^{+}$ reaction and its important implications
• Theoretical study on pp --> p n pi+ reaction at medium energies

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