Experimental search for nonstrange narrow isovector dibaryons

B. Tatischeff, P. Berthet, M. P. Combes-Comets, J. P. Didelez, R. Frascaria, Y. Le Bornec, A. Boudard, J. M. Durand, M. Garcon, J. C. Lugol, Y. Terrien, R. Beurtey, and L. Farvacque
Phys. Rev. C 36, 1995 – Published 1 November 1987
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Abstract

Missing mass spectra from He3(p,d)X at Tp=0.75 GeV (θlab=22°, 32°, and 40°) and Tp=0.925 GeV (θlab=30° and 40°) have been measured. Missing mass spectra from p(3He,d)X at T3He=2.7 GeV and θlab=18° have also been measured. The experiments have been carried out with a high missing mass resolution in order to detect possible narrow structures associated with B=2, T=1 quantum numbers. Such structures have been seen, with the following masses and widths: Mx=2.240±0.005, (Γ1/2≊0.016±0.003) GeV, Mx=2.192±0.003, (Γ1/2≊0.025±0.006) GeV, and Mx=2.121±0.003, (Γ1/2≊0.025±0.002) GeV. A broad structure with mass close to Mx≊2.17 GeV, the mass of free N+Δ, and a width close to Γ1/2≊0.1 GeV is observed. The observed peaks might be related to six-quark states.

  • Received 27 March 1987

DOI:https://doi.org/10.1103/PhysRevC.36.1995

©1987 American Physical Society

Authors & Affiliations

B. Tatischeff, P. Berthet, M. P. Combes-Comets, J. P. Didelez, R. Frascaria, and Y. Le Bornec

  • Institut de Physique Nucléaire, F-91406 Orsay Cedex, France

A. Boudard, J. M. Durand, M. Garcon, J. C. Lugol, and Y. Terrien

  • Departement de Physique Nucléaire à Moyenne Energie, Centre d’Etudes Nucléaires de Saclay, F-91191 Gif-sur-Yvette Cedex, France

R. Beurtey and L. Farvacque

  • Laboratoire National Saturne, Centre d’Etudes Nucléaires de Saclay, F-91191 Gif-sur-Yvette Cedex, France

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Issue

Vol. 36, Iss. 5 — November 1987

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