/ Experiment-Nucl arXiv:0905.0979


Measurement of the isospin-filtering dd ---> He-4 K+ K- reaction at Q = 39-MeV


Yuan, X. (JCHP, Julich) ; Buscher, M. (JCHP, Julich) ; Chiladze, D. (Tbilisi State U.) ; Dymov, S. (Dubna, JINR) ; Dzyuba, A. (St. Petersburg, INP) ; Grishina, V.Yu. (Moscow, INR) ; Hanhart, C. (JCHP, Julich) ; Hartmann, M. (JCHP, Julich) ; Kacharava, A. (JCHP, Julich) ; Khoukaz, A. (Munster U.) ; Kondratyuk, L.A. (Moscow, ITEP) ; Koptev, V. (St. Petersburg, INP) ; Kulessa, P. (Cracow, INP) ; Mielke, M. (Munster U.) ; Mikirtychiants, S. (St. Petersburg, INP) ; Nekipelov, M. (JCHP, Julich) ; Papenbrock, M. (Munster U.) ; Pysz, K. (Cracow, INP) ; Serdyuk, V. (Dubna, JINR) ; Stroher, H. (JCHP, Julich) ; Wilkin, C. (University Coll. London) ; Xu, H. (Lanzhou, Inst. Modern Phys.)

Published in: Eur.Phys.J.
Year: 2009
Vol.: A42
Page No: 1-6
Pages: 5

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-J\'{u}lich. 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.

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