Measurement of the isospin-filtering dd -> 4He K+ K- reaction at Q=39 MeV
nucl-ex
/ Authors
X. Yuan, M. Buescher, D. Chiladze, S. Dymov, A. Dzyuba, V. Yu. Grishina, C. Hanhart, M. Hartmann, A. Kacharava, A. Khoukaz
and 12 more authors
L. A. Kondratyuk, V. Koptev, P. Kulessa, M. Mielke, S. Mikirtychiants, M. Nekipelov, M. Papenbrock, K. Pysz, V. Serdyuk, H. Stroeher, C. Wilkin, H. Xu
/ Abstract
The total cross section for the dd -> 4He K+ K- reaction has been measured at a beam momentum of 3.7 GeV/c, corresponding to an excess energy of 39 MeV, which is the maximum possible at the Cooler Synchrotron COSY-Jülich. A deuterium cluster-jet target and the ANKE forward magnetic spectrometer, placed inside the storage ring, have been employed in this investigation. We find a total cross section of sigma(tot) < 14 pb, which brings into question the viability of investigating the dd -> 4He a0(980) reaction as a means of studying isospin violation.