Further study of the pi-pi S-wave isoscalar amplitude below the K - Kbar threshold

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dc.creatorKaminski, R.
dc.creatorLesniak, L.
dc.creatorRybicki, K.
dc.date1999-12-15
dc.date1999-12-17
dc.date.accessioned2026-07-07T10:34:00Z
dc.date.available2026-07-07T10:34:00Z
dc.descriptionWe continue the analysis of S-wave production amplitudes for the reaction pi- p -> pi+ pi- n involving the data obtained by the CERN--Cracow-Munich collaboration on a transversely polarized target at 17.2 GeV/c pi- momentum. This study deals with the region below the K - Kbar threshold. In particular, we study the "up-steep" solution containing a narrow S-wave resonance under the rho(770). This solution exhibits a considerable inelasticity (eta) which does not have any physical interpretation. Assuming that this inelasticity behaviour represents an unlikely fluctuation we impose eta = 1 for all data points. This leads to non-physical results in one third of the pi+pi- effective mass bins and in the remaining mass bins some parameters behave in a queer way. The situation is even worse for the "down-steep" solution. We conclude that the 17.2 GeV data cannot be described by a relatively narrow f0(750). The "down-flat" and "up-steep" solutions which easily pass the eta = 1 constraint exhibit a slow increase of phase shifts in the rho(770) mass range.
dc.description15 pages, 4 figures (added Fig.2)
dc.identifierhttps://arxiv.org/abs/hep-ph/9912354
dc.identifierhttp://arxiv.org/abs/hep-ph/9912354
dc.identifierActaPhys.Polon.B31:895-908,2000
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/179325
dc.subjectHigh Energy Physics - Phenomenology
dc.titleFurther study of the pi-pi S-wave isoscalar amplitude below the K - Kbar threshold
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