THE pp → ppπ0π0 REACTION AND ITS LIMITING CASE, FUSION TO QUASI-BOUND 2He, IN SEARCH OF THE ABC EFFECT
2011 ◽
Vol 26
(03n04)
◽
pp. 702-704
Keyword(s):
Low Mass
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The π0π0 production in pp -collisions has been investigated in exclusive and kinematically complete measurements from threshold up to Tp = 1.4 GeV . For incident energies Tp > 1 GeV , i.e. in the region beyond the Roper excitation, the ΔΔ excitation process takes over. The data are well explained by the t-channel ΔΔ process dominated by pion exchange. There is no low-mass enhancement (ABC effect) in the π0π0-invariant mass distribution beyond that given by the conventional t-channel ΔΔ process. This is also true for the limiting case, where the protons are in the quasi-bound 2 He state.
2018 ◽
Vol 78
(8)
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2018 ◽
Vol 27
(07)
◽
pp. 1850057
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Keyword(s):
2006 ◽
Vol 633
(2-3)
◽
pp. 173-182
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2009 ◽
Vol 2009
(01)
◽
pp. 047-047
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1983 ◽
Vol 133
(3-4)
◽
pp. 275-278
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