摘要:

The present situation in non‐strange meson spectroscopy is briefly reviewed.

ISSN:0094-243X    

DOI:10.1063/1.2947384

出版商:AIP    

年代:1974

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.2947378

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

A technique is described whereby narrow mesons produced in the reaction&pgr;− + p ⇒ meson + nucleoncan be studied within a few MeV of the threshold. A summary is given of recently published results on the &eegr;, &ohgr;, &eegr;′ S*and &fgr;, and some new data showing an unexpected behaviour of the &ohgr; and &eegr;′ cross sections is presented.

ISSN:0094-243X    

DOI:10.1063/1.2947380

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

&pgr;&pgr; phase shifts from threshold to 1.8 GeV &pgr;&pgr; mass are presented. A value for theI = 0S‐wave scattering length has been obtained and can be compared to other experiments. The ambiguities arising in the phase shifts above 1000 MeV are discussed. K+K−andpp distributions suggest the existence of high mass states above the g meson.

ISSN:0094-243X    

DOI:10.1063/1.2947385

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

An amplitude analysis of the reaction&pgr;+p ⇒ p(&pgr;−&pgr;+&pgr;+)at 7 GeV/c is in progress. Although our method of analysis and assumptions are quite different from those of the Illinois group, our preliminary results are nevertheless consistent with theirs. We fit coherent amplitudes, not the density matrix, and make different assumptions about decay amplitudes of JPstates into various isobars. This approach, furthermore, allows us to probe a much larger set of partial waves than that quoted by the Illinois group, at the expense of imposing explicit rank conditions on the density matrix.

ISSN:0094-243X    

DOI:10.1063/1.2947404

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

We present a re‐analysis of the 3‐&pgr; states produced in&pgr;−p ⇒ &pgr;+&pgr;−&pgr;−p, using unitarized amplitudes.

ISSN:0094-243X    

DOI:10.1063/1.2947405

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

It is suggested that the decay amplitude forA1 ⇒ &rgr;&pgr; ⇒ 3&pgr;may have a strong dependence on the c.m. energy &ohgr; of the 3‐pion system, such that the decay width is adecreasingfunction of &ohgr; in the A1region (this is predicted in some chiral Lagrangian models, for example). This can strongly distort the A1propagator from a simple Breit‐Wigner form, and, together with a decay width forA1 ⇒ &sgr;&pgr; ⇒ 3&pgr;which is anincreasingfunction of &ohgr;, can account qualitatively for the lack of phase variation of the 1+S &rgr; &pgr; amplitude in the analyses of Ascoli and collaborators. This effect is in addition to the rescattering (unitarity) corrections suggested by Aaron and Amado, and reported to this conference by Lasinski.

ISSN:0094-243X    

DOI:10.1063/1.2947406

出版商:AIP    

年代:1974

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.2947407

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

Recent data pertaining to exotic mesons is presented. Unambiguous evidence now exists for the occurrence of reactions proceeding via exchanges involving exotic quantum numbers, although the interpretation of such reactions remains unclear. Exotic mesons have been searched for in both meson exchange and baryon exchange reactions, and no evidence has been found for their existence.

ISSN:0094-243X    

DOI:10.1063/1.2947408

出版商:AIP    

年代:1974

数据来源: AIP

摘要:

First, the well established s‐channel phenomena will be presented and discussed in terms of an overall picture indicated by the behavior of cross‐sections. Second, the observations at low energies will be presented which clearly demonstrate that the annihilations exhibit many direct narrow s‐channel phenomena and many others are indirectly suggested.

ISSN:0094-243X    

DOI:10.1063/1.2947409

出版商:AIP    

年代:1974

数据来源: AIP