Triangle Singularity in the Production of T + cc (3875) and a Soft Pion at Hadron Colliders

If the double-charm tetraquark meson T + cc (3875) is a loosely bound molecule, it 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 . It can also be produced by the creation of D ∗+ D ∗+ at s...

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Bibliographic Details
Published in:EPJ Web of conferences 2022, Vol.274, p.4014
Main Authors: He, Li-Ping, Braaten, Eric, Ingles, Kevin, Jiang, Jun
Format: Article
Language:English
Subjects:
Charm (particle physics)
Mass distribution
Mesons
Particle collisions
Pions
Protons
Singularities
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Summary:If the double-charm tetraquark meson T + cc (3875) is a loosely bound molecule, it 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 . It can also be produced by the creation of D ∗+ D ∗+ at short distances followed by their rescattering into T + cc π + through a charm-meson triangle loop. 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. 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.
ISSN:2100-014X
2101-6275
2100-014X
DOI:10.1051/epjconf/202227404014