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arXiv 1208.0205nucl-ex
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接近Kbar-N阈值的重子共振：pp碰撞中λ（1405）的情况

Baryonic resonances close to the Kbar-N threshold: the case of Lambda(1405) in pp collisions

G. Agakishiev, A. Balanda, D. Belver, A. V. Belyaev, J. C. Berger-Chen, A. Blanco, M. Böhmer, J. L. Boyard, P. Cabanelas, S. Chernenko, A. Dybczak, E. Epple, L.… 展开作者

G. Agakishiev, A. Balanda, D. Belver, A. V. Belyaev, J. C. Berger-Chen, A. Blanco, M. Böhmer, J. L. Boyard, P. Cabanelas, S. Chernenko, A. Dybczak, E. Epple, L. Fabbietti, P. Finocchiaro, P. Fonte, J. Friese, I. Fröhlich, T. Galatyuk, J. A. Garzón, R. Gernhäuser, K. Göbel, M. Golubeva, D. González-Díaz, F. Guber, M. Gumberidze, T. Heinz, T. Hennino, R. Holzmann, A. Ierusalimov, I. Iori, A. Ivashkin, M. Jurkovic, B. Kämpfer, T. Karavicheva, I. Koenig, W. Koenig, B. W. Kolb, G. Kornakov, R. Kotte, A. Krása, F. Krizek, R. Krücken, H. Kuc, W. Kühn, A. Kugler, A. Kurepin, V. Ladygin, R. Lalik, S. Lang, K. Lapidus, A. Lebedev, T. Liu, L. Lopes, M. Lorenz, L. Maier, A. Mangiarotti, J. Markert, V. Metag, B. Michalska, J. Michel, C. Müntz, L. Naumann, Y. C. Pachmayer, M. Palka, Y. Parpottas, V. Pechenov, O. Pechenova, J. Pietraszko, W. Przygoda, B. Ramstein, A. Reshetin, A. Rustamov, A. Sadovsky, P. Salabura, A. Schmah, E. Schwab, J. Siebenson, S. Spataro, B. Spruck, H. Ströbele, J. Stroth, C. Sturm, A. Tarantola, K. Teilab, P. Tlusty, M. Traxler, R. Trebacz, H. Tsertos, T. Vasiliev, V. Wagner, M. Weber, C. Wendisch, J. Wüstenfel, S. Yurevich, Y. V. Zanevsky

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5 pages 3 figures
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摘要：

本文分析了在3.5GeV动能束流能量下p+p->Sigma^{pm}+pi^{mp}+K+p反应中产生的λ（1405）共振。在p+p碰撞中首次重建了两个带电衰变通道λ（1405）-> σ ^{ \pm }+ π ^{ \mp }。经效率和接受度校正后的谱形表明，峰值位置明显低于1400 MeV/c^2。我们得到了sigma_{Lambda(1405)}的总生产截面=9.2 +-0.9 +-0.7 +3.3-1.0 μ b。极角分布的分析表明，λ（1405）在p-p质心系中各向同性产生。

英文摘要：

We present an analysis of the Lambda(1405) resonance produced in the reaction p+p->Sigma^{pm}+pi^{mp}+K+p at 3.5 GeV kinetic beam energy measured with HADES at GSI. The two charged decay channels Lambda(1405) -> Sigma^{\pm}+pi^{\mp} have been reconstructed for the first time in p+p collisions. The efficiency and acceptance-corrected spectral shapes show a peak position clearly below 1400 MeV/c^2. We find a total production cross section of sigma_{Lambda(1405)}=9.2 +- 0.9 +- 0.7 +3.3-1.0 mub. The analysis of its polar angle distribution suggests that the Lambda(1405) is produced isotropically in the p-p center of mass system.

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