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If we approximate light quarks as massless and apply the Schwingerconfinement mechanism to light quarks, we will reach the conclusion that alight quark $q$ and its antiquark $\bar q$ will be confined as a $q\bar q$boson in the Abelian U(1) QED gauge interaction in (1+1)D, as in an openstring. From the work of Coleman, Jackiw, and Susskind, we can infer furtherthat the Schwinger confinement mechanism persists even for massive quarks in(1+1)D. Could such a QED-confined $q\bar q$ one-dimensional open string in(1+1)D be the idealization of a flux tube in the physical world in (3+1)D,similar to the case of QCD-confined $q\bar q$ open string? If so, theQED-confined $q\bar q$ bosons may show up as neutral QED mesons in the massregion of many tens of MeV (PRC81(2010)064903 & JHEP2020(8)165). Is it everpossible that a quark and an antiquark be produced and interact in QED alone toform a confined QED meson? Is there any experimental evidence for the existenceof a QED meson (or QED mesons)? The observations of the anomalous soft photons,the X17 particle, and the E38 particle suggest that they may bear theexperimental evidence for the existence of such QED mesons. Furtherconfirmation and investigations on the X17 and E38 particles will sheddefinitive light on the question of quark confinement in QED in (3+1)D.Implications of quark confinement in the QED interaction are discussed.

On the question of quark confinement in the Abelian U(1) QED gauge interaction