Precision measurement of the $3d \to 2p$ x-ray energy in kaonic $^4$He

S. Okada; G. Beer; H. Bhang; M. Cargnelli; J. Chiba; Seonho Choi; C. Curceanu; Y. Fukuda; T. Hanaki; R. S. Hayano; M. Iio; T. Ishikawa; S. Ishimoto; T. Ishiwatari; K. Itahashi; M. Iwai; M. Iwasaki; B. Juhász; P. Kienle; J. Marton; Y. Matsuda; H. Ohnishi; H. Outa; M. Sato; P. Schmid; S. Suzuki; T. Suzuki; H. Tatsuno; D. Tomono; E. Widmann; T. Yamazaki; H. Yim; J. Zmeskal

doi:10.1016/j.physletb.2007.08.032

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arXiv · 0707.0448

Precision measurement of the $3d \to 2p$ x-ray energy in kaonic $^4$He

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Abstract

We have measured the Balmer-series x-rays of kaonic $^4$He atoms using novel large-area silicon drift x-ray detectors in order to study the low-energy $\bar{K}$-nucleus strong interaction. The energy of the $3d \to 2p$ transition was determined to be 6467 $\pm$ 3 (stat) $\pm$ 2 (syst) eV. The resulting strong-interaction energy-level shift is in agreement with theoretical calculations, thus eliminating a long-standing discrepancy between theory and experiment.

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S. Okada, G. Beer, H. Bhang, M. Cargnelli, J. Chiba, Seonho Choi, C. Curceanu, Y. Fukuda, T. Hanaki, R. S. Hayano, M. Iio, T. Ishikawa, S. Ishimoto, T. Ishiwatari, K. Itahashi, M. Iwai, M. Iwasaki, B. Juhász, P. Kienle, J. Marton, Y. Matsuda, H. Ohnishi, H. Outa, M. Sato, P. Schmid, S. Suzuki, T. Suzuki, H. Tatsuno, D. Tomono, E. Widmann, T. Yamazaki, H. Yim, J. Zmeskal. 2007-07-03. Precision measurement of the $3d \to 2p$ x-ray energy in kaonic $^4$He. https://doi.org/10.1016/j.physletb.2007.08.032

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