论文标题
BGO-OD实验中的陌生光生源
Strangeness Photoproduction at the BGO-OD experiment
论文作者
论文摘要
ELSA加速器设施的BGO-OD实验使用标记为Bremsstrahung Photon光束的能量来研究核子的激发结构。该设置由围绕目标的高度分段的BGO量热仪组成，其粒子跟踪磁光谱仪的正角。 BGO-OD非常适合研究低动量转移过程，因为接受和高动量分辨率是向前角。特别是，这可以调查T渠道交换机制起重要作用的陌生光生殖。这也允许进入低动量交换运动学，在延伸，分子结构可能表现为反应机制。 低$ t $的第一个关键结果表示$ k^+σ^0 $ w = 1900 $ \，MEV，线形和差分横截面的$ k^+σ^0 $ photododuction的第一个关键结果，$ k^+λ$（1405）$ \ rightarrow k^+= k^+σ^0π^0π^0 $，以及$ k^0 _ pptopt^0 $ k^0 _ pptopt^0 $ k^0 $ k^0 $ ppthit^0 $ pphot^0 $ $ k^0_sς^0 $通道中的峰值似乎与梅森 - 巴里昂生成的状态一致，在该状态下，使用等效的模型来描述重型魅力夸克部门中的$ p_c $ pentaquark候选人。
The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon. The setup consists of a highly segmented BGO calorimeter surrounding the target, with a particle tracking magnetic spectrometer at forward angles. BGO-OD is ideal for investigating low momentum transfer processes due to the acceptance and high momentum resolution at forward angles. In particular, this enables the investigation of strangeness photoproduction where t-channel exchange mechanisms play an important role. This also allows access to low momentum exchange kinematics where extended, molecular structure may manifest in reaction mechanisms. First key results at low $t$ indicate a cusp-like structure in $K^+Σ^0$ photoproduction at $W = 1900$\,MeV, line shapes and differential cross sections for $K^+Λ$(1405)$\rightarrow K^+Σ^0π^0$, and a peak structure in $K^0_SΣ^0$ photoproduction. The peak in the $K^0_SΣ^0$ channel appears consistent with meson-baryon generated states, where equivalent models have been used to describe the $P_C$ pentaquark candidates in the heavy charmed quark sector.
