Erratum: Photoproduction of neutral kaons on a liquid deuterium target in the threshold region [Phys. Rev. C78, 014001 (2008)]

Abstract

In the above-named study of the neutral kaon photoproduction, the cross sections given in Figs. 10 and 11 were wrong due to trivial mistakes, mainly in estimating the number of beam photons. The normalization factors for the cross sections are found to be larger by a factor of approximately 3.9 compared to the previous one, though it depends on the K 0 momentum. The corrected spectra are shown in Fig. 11 (numberings are the same as the original ones). As a result, the r K 1 Kγ value obtained by fitting the K 0 spectra in the lower photon energy region (0.9 E γ < 1.0 GeV) should be replaced by the new value of r K 1 Kγ = −1.405 for the Saclay-Lyon A (SLA) model. The phenomenological parameters are also changed: a 0 = 0.3532, a 1 = −0.2152, a 2 = −0.0359, and e 0 = −0.0866 with χ 2 /n.d.f. = 0.80.By these corrections, the experimental cross sections are larger than those calculated by the Kaon-MAID model in the momentum region of P K 0 < 0.4 GeV/c both in the lower and higher photon beam energies. However, the K 0 spectral shapes in the laboratory system are essentially the same as those of the previous ones and the discussion does not change. In Fig. 12, the K 0 angular distributions for the SLA and PH models calculated with the new parameters are shown together with those for the Kaon-MAID model. It suggests a much enhanced backward K 0 distribution in the c.m. system because the SLA and PH1 models are preferred to reproduce the new results with larger cross sections.

The Recent Results of Strangeness Photoproduction in the Threshold Region at ELPH-Tohoku

“…The PH and SLA calculation present backward enhancing distribution reflecting the low momentum peak P Lab K 0 ∼ 0.3 GeV/c. This tendency is the same as the result of the measurement with the NKS [8]. The contamination from γn → K 0 Σ 0 and γp → K 0 Σ + is not significant because of their higher threshold E γ = 1.051 GeV and E γ = 1.062 GeV, respectively.…”

“…After the successful measurement of inclusive K 0 photoproduction cross sections on the neutron with the Neutral Kaon Spectrometer (NKS) [7,8], we developed the Neutral Kaon Spectrometer 2 (NKS2) mainly for detection of Λ with improved acceptance in the forward angular region. We performed the inclusive measurements of K 0 and Λ using invariant masses of π + π − for K 0 identification and pπ − for Λ identification.…”

Kaon photoproduction on the deuteron at Sendai

“…4. These spectra cover extensively in the K 0 production angle than that of NKS [4]. The error bars show the statistical errors in these figures.…”

“…The decay volume selection in detail was described as Ref. [4]. The acceptances were estimated using the Monte-Carlo simulation based on Geant4.…”

Neutral Kaon Spectrometer 2

“…The NKS collaboration performed pioneering experiments studying the γ + d → K 0 + Λ + X [6] and γ+ 12 C → K 0 + Λ + X [7] reactions near the threshold energy for strangeness photoproduction. The threshold energy E γ is 0.914 GeV for the elementary γ + n → K 0 + Λ reaction assuming the free neutron target at rest.…”