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在2.85 GeV的pp -> p λ K+反应中形成的深束缚致密K-pp态的指示

Indication of a deeply bound compact K-pp state formed in the pp -> p Lambda K+ reaction at 2.85 GeV

T. Yamazaki, M. Maggiora, P. Kienle, K. Suzuki, A. Amoroso, M. Alexeev, F. Balestra, Y. Bedfer, R. Bertini, L. C. Bland, A. Brenschede, F. Brochard, M. P. Bussa… 展开作者

T. Yamazaki, M. Maggiora, P. Kienle, K. Suzuki, A. Amoroso, M. Alexeev, F. Balestra, Y. Bedfer, R. Bertini, L. C. Bland, A. Brenschede, F. Brochard, M. P. Bussa, Seonho Choi, M. L. Colantoni, R. Dressler, M. Dzemidzic, J. -Cl. Faivre, L. Ferrero, J. Foryciarz, I. Froehlich, V. Frolov, R. Garfagnini, A. Grasso, S. Heinz, W. W. Jacobs, W. Kuhn, A. Maggiora, D. Panzieri, H. -W. Pfaff, G. Pontecorvo, A. Popov, J. Ritman, P. Salabura, S. Sosio, V. Tchalyshev, S. E. Vigdor

备注：
4 pages, 4 figures
发表信息：
Phys.Rev.Lett.104:132502,2010
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摘要：

我们分析了2.85GeV的排他性pp -> p λ K+反应的DISTO实验数据，寻找pp -> K+ + X反应中形成的强束缚紧致K-pp（= X）态. K ~+丢失质量谱和p λ不变量质量谱的观测结果表明，在p和K ~+的高横动量情况下，K ~+丢失质量谱和p λ不变量质量谱都有一个明显的宽峰，峰的质量M_X = 2265 ± 2（stat）± 5（syst）MeV/c ~ 2，峰宽γ_X = 118 ± 8（stat）± 10（syst）MeV。

英文摘要：

We have analyzed data of the DISTO experiment on the exclusive pp -> p Lambda K+ reaction at 2.85 GeV to search for a strongly bound compact K-pp (= X) state to be formed in the pp -> K+ + X reaction. The observed spectra of the K+ missing-mass and the p Lambda invariant-mass with high transverse momenta of p and K+ revealed a broad distinct peak with a mass M_X = 2265 +- 2 (stat) +- 5 (syst) MeV/c2 and a width Gamma_X = 118 +- 8 (stat) +- 10 (syst) MeV.

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