Measurement of the dp -->3He eta reaction near threshold

J. Smyrski; H. -H. Adam; A. Budzanowski; E. Czerwinski; R. Czyzykiewicz; D. Gil; D. Grzonka; M. Janusz; L. Jarczyk; B. Kamys; A. Khoukaz; P. Klaja; T. Mersmann; P. Moskal; W. Oelert; C. Piskor-Ignatowicz; J. Przerwa; B. Rejdych; J. Ritman; T. Rozek; T. Sefzick; M. Siemaszko; A. Taeschner; P. Winter; M. Wolke; P. Wuestner; W. Zipper

doi:10.1016/j.physletb.2007.04.021

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Measurement of the dp -->3He eta reaction near threshold

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Abstract

Total and differential cross sections for the dp --> 3He eta reaction have been measured near threshold for 3He center-of-mass momenta in the range from 17.1 MeV/c to 87.5 MeV/c. The data were taken during a slow ramping of the COSY internal deuteron beam scattered on a proton target detecting the 3He ejectiles with the COSY-11 facility. The forward-backward asymmetries of the differential cross sections deviate clearly from zero for center-of-mass momenta above 50 MeV/c indicating the presence of higher partial waves in the final state. Below 50 MeV/c center-of-mass momenta a fit of the final state enhancement factor to the data of the total cross sections results in the 3He eta scattering length of a = |2.9 +/- 0.6| + i (3.2 +/- 0.4) fm.

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J. Smyrski, H. -H. Adam, A. Budzanowski, E. Czerwinski, R. Czyzykiewicz, D. Gil, D. Grzonka, M. Janusz, L. Jarczyk, B. Kamys, A. Khoukaz, P. Klaja, T. Mersmann, P. Moskal, W. Oelert, C. Piskor-Ignatowicz, J. Przerwa, B. Rejdych, J. Ritman, T. Rozek, T. Sefzick, M. Siemaszko, A. Taeschner, P. Winter, M. Wolke, P. Wuestner, W. Zipper. 2007-02-22. Measurement of the dp -->3He eta reaction near threshold. https://doi.org/10.1016/j.physletb.2007.04.021

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