Constraints on coupling constants through charged Σ photoproduction

Abstract

The few available data for the reactions γp → K 0 Σ + and γn → K + Σ − are compared to models developed for the processes γp → K + Σ 0 and γp → K + Λ. It is found that some of these phenomenological models overpredict the measurements by up to a factor of 100. Fitting the data for all of these reactions leads to drastically reduced Born coupling constants.

Strangeness production on the nucleon

“…The p(γ, K)Σ results reported by Mart et al in Ref. [12] are based on such a procedure. In calculations with model C we are solely constraining the relative sign between the two coupling constants.…”

“…Within such a scheme, a common analysis of both reaction channels becomes possible. In principle, the n(γ, K 0 )Σ 0 and n(γ, K + )Σ − channels could also be implemented in this scheme [12]. Data for those reaction channels are sparse, though.…”

“…Despite these reservations, we will retain model C in the forthcoming discussions. In literature, the procedure of freely varying g K + Λp and g K + Σ 0 p parameters is adopted by several authors [11,12,26] and, in general, leads to very satisfactory descriptions of the data.…”

“…The quantization axes for the polarization asymmetries are defined as follows: It is well known that the sixteen quantities, as given in Table 3.1, are not independent. There exist six non-linear relations between them [10,57]: 12) which reduce the number of independent observables necessary to determine the full transition amplitude.…”

“…This work marked the start of a long series of theoretical efforts in this field [8][9][10][11][12][13][14][15][16]. The earliest works clearly lacked the presence of a reliable database.…”