$\ensuremath{\pi}N$ and $\ensuremath{\eta}p$ deexcitation channels of the ${N}^{*}$ and \ensuremath{\Delta} baryonic resonances between 1470 and 1680 MeV

$π N$ and $η p$ deexcitation channels of the $N^{*}$ and Δ baryonic resonances between 1470 and 1680 MeV

B. Tatischeff, J. Yonnet, M. Boivin, M. P. Comets, P. Courtat, R. Gacougnolle, Y. Le Bornec, E. Loireleux, M. MacCormick, and F. Reide

Phys. Rev. C 72, 034004 – Published 21 September 2005

Abstract

Two reactions, $pp \to ppX$ and $pp \to p π^{+} X$ , are used to study the $1.47 \leq M \leq 1.680$ GeV baryonic mass range. Three different final states are considered in the invariant masses: $N^{*}$ or $Δ^{+}, n π^{+}$ or $p π^{0}$ , and $p η$ . The last two channels are defined by software cuts applied to the missing mass of the first reaction. Several narrow structures are extracted with widths $σ (Γ)$ varying between 3 and 9 MeV. Some structures are observed in one channel but not in another. Such nonobservation may be due either to the spectrometer momenta limits or to the physics (e.g., no such disintegration channel is allowed from the narrow state considered).

We tentatively conclude that the broad Particle Data Group (PDG) baryonic resonances— $N (1520) D_{13}, N (1535) S_{11}, Δ (1600) P_{33}, N (1650) S_{11}$ , and $N (1675) D_{15}$ —are collective states built from several narrow and weakly excited resonances, each having a (much) smaller width than the one reported by PDG.

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Received 17 December 2004

DOI:https://doi.org/10.1103/PhysRevC.72.034004

Authors & Affiliations

B. Tatischeff^1,*, J. Yonnet¹, M. Boivin², M. P. Comets¹, P. Courtat¹, R. Gacougnolle¹, Y. Le Bornec¹, E. Loireleux¹, M. MacCormick¹, and F. Reide¹

¹Institut de Physique Nucléaire, Universite Paris-Sud, CNRS/IN2P3, F-91406 Orsay Cedex, France
²Laboratoire National Saturne, CNRS/IN2P3, F-91191 Gif-sur-Yvette Cedex, France

^*E-mail: tati@ipno.in2p3.fr

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Vol. 72, Iss. 3 — September 2005

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Physical Review C

covering nuclear physics

$π N$ and $η p$ deexcitation channels of the $N^{*}$ and Δ baryonic resonances between 1470 and 1680 MeV

B. Tatischeff, J. Yonnet, M. Boivin, M. P. Comets, P. Courtat, R. Gacougnolle, Y. Le Bornec, E. Loireleux, M. MacCormick, and F. Reide

Phys. Rev. C 72, 034004 – Published 21 September 2005

Abstract

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Physical Review C

covering nuclear physics

πN and ηp deexcitation channels of the N* and Δ baryonic resonances between 1470 and 1680 MeV

B. Tatischeff, J. Yonnet, M. Boivin, M. P. Comets, P. Courtat, R. Gacougnolle, Y. Le Bornec, E. Loireleux, M. MacCormick, and F. Reide

Phys. Rev. C 72, 034004 – Published 21 September 2005

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$π N$ and $η p$ deexcitation channels of the $N^{*}$ and Δ baryonic resonances between 1470 and 1680 MeV