Abstract
The decay Ds+→pp¯e+νe with a proton–antiproton pair in the final state is unique in the sense that it is the only semileptonic baryonic decay which is physically allowed in the charmed meson sector. Its measurement will test our basic knowledge on semileptonic Ds+ decays and the low-energy pp¯ interactions. Taking into account the major intermediate state contributions from η,η′,f0(980) and X(1835), we find that its branching fraction is at the level of 10−9∼10−8. The location and the nature of X(1835) state are crucial for the precise determination of the branching fraction. We wish to trigger a new round of a careful study with the upcoming more data in BESIII as well as the future super tau-charm factory.
Highlights
A great deal of effort has been devoted to the baryonic decay modes of B mesons [1, 2] due to the fact that the B meson is heavy enough to allow a baryonantibaryon pair production in the final state
The future experimental measurement can rectify the description of Ds+ → pphadronic transition form factors as well as the low-energy ppinteraction
In Ref. [16], we have explored the form factors and branching fractions for the semileptonic Ds → M transition
Summary
A great deal of effort has been devoted to the baryonic decay modes of B mesons [1, 2] due to the fact that the B meson is heavy enough to allow a baryonantibaryon pair production in the final state. The future experimental measurement can rectify the description of Ds+ → pphadronic transition form factors as well as the low-energy ppinteraction If this channel can be observed, it renders a preponderant possibility to access the ppbound state due to the low-energy ppregion. We first consider the Cabibbo-favored decay Ds+ → M(ss) + e+νe with M being the meson containing a sizable ssquark component Since such meson decaying to a pppair is an OZI suppressed process, we shall focus on the intermediate mesons.
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