质子-碳相互作用中K0S介子和λ超子产生性质的31 GeV/c测量
Measurements of Production Properties of K0S mesons and Lambda hyperons in Proton-Carbon Interactions at 31 GeV/c
摘要：
在31 GeV/c能量下，用大接受度NA 61/SHINE谱仪测量了p+C相互作用中K 0 S介子和λ超子的能谱.收集的数据与各向同性石墨靶的厚度为4%的核相互作用长度。相互作用的截面，带电π介子光谱和带电K介子光谱先前使用相同的数据集测量。p+C相互作用中K 0 S和λ产生的结果为理解核-核碰撞中奇异产生的增强提供了参考。此外，他们提供了重要的投入，为改善中微子通量预测的T2 K长基线中微子振荡实验在日本。包容性生产截面K 0 S和Lambda的实验室极角的范围从0到240 mrad的间隔作为实验室动量的函数。的结果进行了比较与几个强子产生模型的预测。测量了生产过程中的K 0 S平均多重性<n_K0S>和K 0 S生产的包含性截面，分别为0.127 ± 0.005（stat）± 0.022（sys）和29.0 ± 1.6（stat）± 5.0（sys）mb。
英文摘要：
Spectra of K0S mesons and Lambda hyperons were measured in p+C interactions at 31 GeV/c with the large acceptance NA61/SHINE spectrometer at the CERN SPS. The data were collected with an isotropic graphite target with a thickness of 4% of a nuclear interaction length. Interaction cross sections, charged pion spectra, and charged kaon spectra were previously measured using the same data set. Results on K0S and Lambda production in p+C interactions serve as reference for the understanding of the enhancement of strangeness production in nucleus-nucleus collisions. Moreover, they provide important input for the improvement of neutrino flux predictions for the T2K long baseline neutrino oscillation experiment in Japan. Inclusive production cross sections for K0S and Lambda are presented as a function of laboratory momentum in intervals of the laboratory polar angle covering the range from 0 up to 240 mrad. The results are compared with predictions of several hadron production models. The K0S mean multiplicity in production processes <n_K0S> and the inclusive cross section for K0S production were measured and amount to 0.127 +- 0.005 (stat) +- 0.022 (sys) and 29.0 +- 1.6 (stat) +- 5.0 (sys) mb, respectively.
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