第十一届中国LHC物理会议（CLHCP2025）

The CMS experiment reports the observation of three structures in the //→+−+− channel — (6600), (6900), and (7100) — each with a significance well above 5, confirming and extending the earlier Run 2 results. Strong interference effects among them, also above 5, indicate they share the same quantum numbers. A complementary search in the /(2) channel reveals two structures consistent with (6900) and (7100). A spin–parity analysis favors a =2++ assignment, a rare quantum number among known hadrons. Together, these findings strongly support the interpretation of these states as a family of all-charm tetraquarks, offering new insights into the dynamics of exotic resonances.