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arXiv 1011.0822nucl-ex
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光子能量高达2.65 GeV时反应$γp \TO K^ + Λ(1520)$的测量

Measurement of the reaction $γp \TO K^ + Λ(1520)$ at photon energies up to 2.65 GeV

F. W. Wieland, J. Barth, K. -H. Glander, J. Hannappel, N. Jöpen, F. Klein, E. Klempt, R. Lawall, D. Menze, M. Ostrick, E. Paul, I. Schulday, W. J. Schwille

摘要:

反应$γp \TO K^+Λ(1520)$测量的能量范围从阈值到2.65 GeV的SAPHIR探测器在电子展宽设施ELSA在波恩举行。$Λ(1520)$产生截面在$pK^-$、$n \bar{K}^0$、$Σ^{\pm}π^{\mp}$和$Λπ^+π^-$衰变模式中作为光子能量和平方四动量转移$t$的函数进行分析。虽然包容性反应的横截面随能量稳步上升,但过程$γp \TO K^+Λ(1520)$的横截面在约2.0 GeV的光子能量处达到峰值,随着$t$呈指数下降,并且随着光子能量的增加而显示出斜率平坦化。在$t$通道螺旋度系统中的角分布既不表明$K$也不表明$K^\star$交换占优势.不支持将$Λ(1520)$解释为$Σ(1385)π$分子。

英文摘要:

The reaction $γp \TO K^+Λ(1520)$ was measured in the energy range from threshold to 2.65 GeV with the SAPHIR detector at the electron stretcher facility ELSA in Bonn. The $Λ(1520)$ production cross section was analyzed in the decay modes $pK^-$, $n \bar{K}^0$, $Σ^{\pm}π^{\mp}$, and $Λπ^+π^-$ as a function of the photon energy and the squared four-momentum transfer $t$. While the cross sections for the inclusive reactions rise steadily with energy, the cross section of the process $γp \TO K^+Λ(1520)$ peaks at a photon energy of about 2.0 GeV, falls off exponentially with $t$, and shows a slope flattening with increasing photon energy. The angular distributions in the $t$-channel helicity system indicate neither a $K$ nor a $K^\star$ exchange dominance. The interpretation of the $Λ(1520)$ as a $Σ(1385)π$ molecule is not supported.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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