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首页> 外文期刊>Physical review, C >Photoproduction and electroproduction of Lambda (1405) via gamma((*)) p -> K*+pi(0)Sigma(0)
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Photoproduction and electroproduction of Lambda (1405) via gamma((*)) p -> K*+pi(0)Sigma(0)

机译：通过γ（（*））P - > K * + Pi（0）σ（0）光洗脱和电解电切除和电切割λ（1405）

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摘要

We study the photoproduction and electroproductions of the vector kaon off the proton, i.e., gamma ((*)) p -> K*+pi(0)Sigma(0), and investigate the line shape of the pi(0) Sigma(0) invariant mass in an effective Lagrangian approach with the inclusion of a K*N Lambda* interaction. Relevant electromagnetic form factors for the neutral hyperons and charged strange mesons are constructed by considering experimental and theoretical information. We find that the Lambda* peak is clearly observed for the photoproduction and electroproductions with the finite K*N Lambda* interaction, whereas the clear peak signals survive only for the electroproduction, when we ignore the interaction. These different behaviors can be understood by different Q(2) dependencies in the K* electromagnetic and K* -> gamma K transition form factors. We suggest a photon-polarization asymmetry Sigma to extract information of the K*N Lambda* interaction. It turns out that Sigma near the Lambda* peak region becomes negative with a finite K*N Lambda* interaction while positive without it for Q2 = 0, because of the different naturalities of K and K* exchanges. For Q(2) not equal 0, we observe more obvious signals in the peak region owing to the additional contribution of the longitudinal virtual photon for Lambda*.
机译：我们研究了载体的载体远离质子，即γ（（*））p - > K * + Pi（0）Sigma（0），并研究Pi（0）Sigma的线形状（ 0）在有效的拉格朗日方法中不变质量，包含k * n lambda *互动。通过考虑实验和理论信息，构建中性超谐波和带电奇怪介质的相关电磁形式因素。我们发现用有限k * nλ*相互作用清楚地观察到Lambda *峰值，而透明峰值信号仅在忽略相互作用时才能存活。通过k *电磁和k * - >伽马k转换形成因子的不同Q（2）依赖性可以理解这些不同的行为。我们建议光子偏振不对称Sigma以提取K * n Lambda *相互作用的信息。事实证明，λ*峰值区域附近的Sigma具有有限的K * nλ*相互作用，而在没有它的Q2 = 0的情况下为阳性，因为K和K *交换的不同。对于Q（2）不等于0，我们由于纵向虚拟光子用于Lambda *的额外贡献，我们在峰值区域中观察更明显的信号。

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