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Triangle Singularity in the Production of Tcc(3875) and a Soft Pion

Aug 9, 2022, 5:20 PM
Oral report 强子物理与味物理 Parallel Session II (2):Hadron and Flavor Physics


Dr Jun Jiang (Shandong University)


The double-charm tetraquark meson $T_{cc}^+​(3875)$ can be produced in high-energy proton-proton collisions by the creation of the charm mesons $D^{*+} D^0$ at short distances followed by their binding into $T_{cc}^+​$. The $T_{cc}^+​$ can also be produced by the creation of $D^{*+} D^{*+}$ at short distances followed by their rescattering into $T_{cc}^+ ​π^+$. A charm-meson triangle singularity produces a narrow peak in the $T_{cc}^+ ​π^+$ invariant mass distribution 6.1 MeV above the threshold with a width of about 1 MeV. Well beyond the peak, the differential cross section decreases with the invariant kinetic energy E of $T_{cc}^+ ​π^+$ as $E^{-1/2}$. The fraction of T_{cc}^+​ that are accompanied by $π^+$ with $E< m_π​$ is estimated to be roughly 3%. The fraction of $T_{cc}^+$ events with $T_{cc}^+​ π^+$ in the narrow peak from the triangle singularity could be comparable.

Primary authors

Prof. Eric Braaten (The Ohio State University) Dr Jun Jiang (Shandong University) Mr Kevin Ingles (The Ohio State University) Dr Liping He (Helmholtz-Institut f¨ur Strahlen- und Kernphysik and Bethe Center for Theoretical Physics)

Presentation materials