First results on kaonic hydrogen from the DEAR experiment

Springer Science and Business Media LLC - Tập 19 - Trang 185-188 - 2004
C. Guaraldo1, G. Beer2, A.M. Bragadireanu1,3, M. Cargnelli4, C. Curceanu (Petrascu)1,3, J.-P. Egger5,6, H. Fuhrman4, M. Iliescu1,3, T. Ishiwatari4, K. Itahashi7, M. Iwasaki8, B. Lauss9, V. Lucherini1, L. Ludhova5, J. Marton4, F. Mulhauser5, T. Ponta1,3, L.A. Schaller5, R. Seki10,11, D. Sirghi1,3, F. Sirghi1, P. Strasser8, J. Zmeskal4
1INFN-Laboratori Nazionali di Frascati, C.P. 13, Via E. Fermi 40, I-00044 Frascati, Italy
2University of Victoria, Department of Physics and Astronomy, P.O. Box 3055 Victoria, BC, Canada V8W3P6
3Institute of Physics and Nuclear Engineering “Horia Hulubei”, P.O. Box MG - 6, R-76900, Bucharest, Romania
4Institute for Medium Energy Physics, Boltzmanngasse 3, A-1090, Vienna, Austria
5Universite de Fribourg, Institut de Physique, Bd. de Perolles, CH-1700 Fribourg, Switzerland
6Universite de Neuchatel, Institut de Physique, 1 rue A.-L. Breguet, CH-2000 Neuchatel, Switzerland
7Tokyo Institute of Technology, 2-12-1 Ookoyana Meguro, Tokyo 152, Japan
8Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, Saitama 351-01, Japan
9Physics Department, University of California and Berkeley, Berkeley CA 94720, USA
10W.E. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125, USA
11Department of Physics and Astrophysics, California State University, Northridge, CA 91330, USA

Tóm tắt

The objective of DEAR (DAΦNE Exotic Atom Research) is the measurement of the K α line shift and width, due to the strong interaction, in kaonic hydrogen and a similar measurement - the first one - in kaonic deuterium. The aim is a precision determination of the antikaon-nucleon isospin dependent scattering lengths in order to obtain the kaon nucleon sigma terms. In a first phase, dedicated to the calibration and optimization of the setup, the experiment collected data on kaonic nitrogen: for the first time a complex of three transitions (7 → 6 at 4.6 keV, 6 → 5 at 7.6 keV and 5 → 4 at 14 keV) was measured, and the corresponding yields obtained. The kaonic hydrogen measurement was performed for a total integrated luminosity of about 60 pb-1 in the last months of the 2002 year. Data analyses are in progress, preliminary results being hereby presented, together with those on kaonic nitrogen. PACS: 36.10.-K – 36.10.Gv

Tài liệu tham khảo

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Springer Science and Business Media LLC

Tập 19

185-188

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