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X atom: a new key to revealing the $X(3872)$ mystery | | Zhen-Hua Zhang
; Feng-Kun Guo
; | | Date: |
15 Dec 2020 | | Abstract: | The $X(3872)$, whose mass coincides with the $D^0ar D^{*0}$ threshold, is
the most extended hadron object. Since its discovery in 2003, debates have
never stopped regarding its internal structure. We propose a new object, the X
atom, which is the $D^pm D^{*mp}$ composite system with positive charge
parity and a mass of $(3879.89pm0.07)$ MeV, formed mainly due to the Coulomb
force. We show that a null signal of the X atom can be used to put a lower
limit on the binding energy of the $X(3872)$. From the current knowledge of the
$X(3872)$ properties, the production rate for the X atom relative to the
$X(3872)$ in $B$ decays and at hadron colliders should be at least
$8 imes10^{-3}$. New insights into the $X(3872)$ will be obtained through
studying the X atom. | | Source: | arXiv, 2012.08281 | | Services: | Forum | Review | PDF | Favorites | |
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