Strange-Particle Production byπ+pat 3.7 GeV/c

Abstract

3177where Q i s the c.m. momentum of the 9, and q the momentum of the K mesons in the C r e s t frame. 4 2~. Alvensleben et a1 . , Phys. Rev. Letters 28, 66 (1972). 3~.The results of a study of strange-particle production in rrtp interactions at 3 . 7 GeV/c a r e presented. Cross sections for a large number of strange-particle final states a r e given; the over-all strange-particle production cross section i s about 1.3 mb. Comparison of crosssection results on two-body and quasi-two-body final states with corresponding s-p data shows no evidence for exotic exchanges. Comparison of the peripheral cross sections for rr'p -K t X+ and n+p -K + Z + ( 1 3 8 5 ) with those for the line-reversed reactions shows reasonable agreement for K+ Ct and gross disagreement for K t Zt (1385). Simultaneous K*'(891) 2 ' (1385) production occurs, but, unlike its nonstrange counterpart, it is not dominated by pseudoscalar exchange. There i s significant @(1019) production via the reaction n+p -@ n t p , but none of it appears to be associated with A T f ( 1 2 3 6 ) . Cross sections for resonance production in various three-and four-body final states a r e presented.

Role of theΔ*(1940)in theπ+p→K+Σ+Xie1, Wang2, Zou3 2014Phys. Rev. C12040View full textAdd to dashboardCite

“…Furthermore, the branch ration Br(∆ * → Σ * K) and partial decay width Γ ∆ * →Σ * K are (10.4 ± 4.9)% and 17.9 ± 12.9 MeV, respectively. We find that the Σ * K decay mode of the ∆ * (1940) resonance could be larger than the N π channel, if one attributes the bump structure in the total cross sections of π + p → K + Σ + (1385) reaction [34][35][36], to the effects produced by this resonance, as implicitly assumed in this work. This large coupling of the two-star D−wave J P = 3/2 − ∆ * (1940) resonance to the Σ * K + channel will confirm/get support from the QM results of Capstick, and Roberts in Ref.…”

“…3, comparing with the experimental data from Refs. [34][35][36]. The black-solid line represents the full results, while the contributions from the s-channel ∆ ++ * (1940) resonance, t-channel K * 0 (892) exchange, u-channel Λ(1115) and Σ 0 (1193) terms are shown by the dash-dot-doted, dashed, dotted, and dashdoted lines, respectively.…”

“…[35] (triangles), and Ref. [36] (square). The curves are the contributions from s-channel ∆ * (1940) (dash-dot-dotted), tchannel K * 0 (dashed), u-channel Σ 0 (1193) (dash-dotted) and Λ(1115) (dotted), and the total contributions of them (blacksolid), respectively.…”

“…[34], but, it can not give the bump structure if we take those measurements of Refs. [35,36] into account as shown in Fig. 3.…”

“…[34] and the total cross sections data of Refs. [34][35][36] can not be simultaneously fitted well, which is because the differential cross sections data with large uncertainties are inconsistent between different angles and energies, hence, those data points about the differential cross sections from Ref. [34] are not taken into account in our best fit.…”