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24 April 2024

» arxiv » 1302.2797

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Study of kaonic deuterium X-rays by the SIDDHARTA experiment at DAFNE
M. Bazzi ; G. Beer ; C. Berucci ; L. Bombelli ; A.M. Bragadireanu ; M. Cargnelli ; C. Curceanu ; A. d'Uffizi ; C. Fiorini ; T. Frizzi ; F. Ghio ; C. Guaraldo ; R. Hayano ; M. Iliescu ; T. Ishiwatari ; M. Iwasaki ; P. Kienle ; P. Levi Sandri ; A. Longoni ; J. Marton ; S. Okada ; D. Pietreanu ; T. Ponta ; A. Romero Vidal ; E. Sbardella ; A. Scordo ; H. Shi ; D.L. Sirghi ; F. Sirghi ; H. Tatsuno ; A. Tudorache ; V. Tudorache ; O. Vazquez Doce ; E. Widmann ; J. Zmeskal ;
Date:	12 Feb 2013
Abstract:	The study of the KbarN system at very low energies plays a key role for the understanding of the strong interaction between hadrons in the strangeness sector. At the DAFNE electron-positron collider of Laboratori Nazionali di Frascati we studied kaonic atoms with Z=1 and Z=2, taking advantage of the low-energy charged kaons from Phi-mesons decaying nearly at rest. The SIDDHARTA experiment used X-ray spectroscopy of the kaonic atoms to determine the transition yields and the strong interaction induced shift and width of the lowest experimentally accessible level (1s for H and D and 2p for He). Shift and width are connected to the real and imaginary part of the scattering length. To disentangle the isospin dependent scattering lengths of the antikaon-nucleon interaction, measurements of Kp and of Kd are needed. We report here on an exploratory deuterium measurement, from which a limit for the yield of the K-series transitions was derived: Y(K_tot)<0.0143 and Y(K_alpha)<0.0039 (CL 90%). Also, the upcoming SIDDHARTA-2 kaonic deuterium experiment is introduced.
Source:	arXiv, 1302.2797
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