Measurement of the isospin-filtering dd -> 4He K+ K- reaction at Q=39 MeV
X.Yuan, M.Buescher, D.Chiladze, S.Dymov, A.Dzyuba, V.Yu.Grishina,, C.Hanhart, M.Hartmann, A.Kacharava, A.Khoukaz, 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
TL;DR
This study measures the total cross section of the dd -> 4He K+ K- reaction at 39 MeV excess energy using COSY-Jülich, providing insights into isospin filtering and reaction viability.
Contribution
First measurement of the dd -> 4He K+ K- reaction cross section at this energy, challenging previous assumptions about isospin violation studies.
Findings
Total cross section < 14 pb at Q=39 MeV
Results question the feasibility of using this reaction to study isospin violation
Provides new experimental data for theoretical models
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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