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Observation of a pseudoscalar excess at the $t\bar{t}$ threshold
Published 10 Oct 2025 in hep-ex and hep-ph | (2510.09070v1)
Abstract: The CMS Collaboration recently observed a pseudoscalar excess of top quark-antiquark ($t\bar{t}$) events near the production threshold. One possible interpretation involves the formation of a short-lived quasi-bound state of $t\bar{t}$. This proceeding summarizes the first presentation of the results at the 59th Rencontres de Moriond and outlines its potential implications.
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