A new measurement of kaonic hydrogen X-rays
A new measurement of kaonic hydrogen X-rays
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DOI：
10.1016/j.physletb.2011.09.011
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发表时间：
2011-10-13
影响因子：
4.4
通讯作者：
Zmeskal, J.
中科院分区：
文献类型：
--
作者：
Bazzi, M.;Beer, G.;Zmeskal, J.
阈值下的（K）over barN系统是低能QCD，特别是显式手征对称性破缺的敏感实验场。因此，我们在DAPHI NE正负电子对撞机上测量了K系列K原子的X射线，并确定了Is原子态的强相互作用能级位移和宽度的最精确值。作为X射线探测器，我们使用了大面积硅漂移探测器，具有优异的能量和时间分辨率，这是专门为SIDDHARTA实验。位移和宽度分别确定为γ（Is）= -283 +/-36（stat）+/-6（syst）eV和γ（Is）= 541 +/-89（stat）+/-22（syst）eV。新的值将提供至关重要的约束的理论描述的低能量（K）barN相互作用。(C)2011 Elsevier B. V.保留所有权利。
The (K) over barN system at threshold is a sensitive testing ground for low energy QCD, especially for the explicit chiral symmetry breaking. Therefore, we have measured the K-series X-rays of kaonic hydrogen atoms at the DA Phi NE electron-positron collider of Laboratori Nazionali di Frascati, and have determined the most precise values of the strong-interaction energy-level shift and width of the Is atomic state. As X-ray detectors, we used large-area silicon drift detectors having excellent energy and timing resolution, which were developed especially for the SIDDHARTA experiment. The shift and width were determined to be epsilon(1s) = -283 +/- 36(stat) +/- 6(syst) eV and Gamma(1s) = 541 +/- 89(stat) +/- 22(syst) eV, respectively. The new values will provide vital constraints on the theoretical description of the low-energy (K) over barN interaction. (C) 2011 Elsevier B.V. All rights reserved.