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26 April 2024

» arxiv » 1603.0094

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$K$-series X-rays yield measurement of kaonic hydrogen atoms in gaseous target
M. Bazzi ; G. Beer ; G. Bellotti ; C. Berucci ; A.M. Bragadireanu ; D. Bosnar ; M. Cargnelli ; C. Curceanu ; A.D. Butt ; A. d'Uffizi ; C. Fiorini ; F. Ghio ; C. Guaraldo ; R.S. Hayanao ; M. Iliescu ; T. Ishiwatari ; M. Iwasaki ; P. Levi Sandri ; J. Marton ; S. Okada ; D. Pietreanu ; K. Piscicchia ; A. Romero Vidal ; E. Sbardella ; A. Scordo ; H. Shi ; D.L. Sirghi ; F. Sirghi ; H. Tatsuno ; O. Vazquez Doce ; E. Widmann ; J. Zmeskal ;
Date:	1 Mar 2016
Abstract:	We measured the $K$-series X-rays of the $K^{-}p$ exotic atom in the SIDDHARTA experiment with a gaseous hydrogen target of 1.3 g/l, which is about 15 times the $ ho_{ m STP}$ of hydrogen gas. At this density, the absolute yields of kaonic X-rays, when a negatively charged kaon stopped inside the target, were determined to be 0.012$^{+0.004}_{-0.003}$ for $K_{alpha}$ and 0.043$^{+0.012}_{-0.011}$ for all the $K$-series transitions $K_{tot}$. These results, together with the KEK E228 experiment results, confirm for the first time a target density dependence of the yield predicted by the cascade models, and provide valuable information to refine the parameters used in the cascade models for the kaonic atoms.
Source:	arXiv, 1603.0094
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