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Hunting for tetraquarks in ultra-pheripheral heavy ion collisions | | Angelo Esposito
; Claudio Andrea Manzari
; Alessandro Pilloni
; Antonio Davide Polosa
; | | Date: |
21 Sep 2021 | | Abstract: | Ultra-peripheral heavy ion collisions constitute an ideal setup to look for
exotic hadrons because of their low event multiplicity and the possibility of
an efficient background rejection. We propose to look for four-quark states
produced by photon-photon fusion in these collisions at center-of-mass energy
per nucleon pair $sqrt{s_{
m NN}}=5.5~{
m TeV}$. In particular, we focus on
those states that would represent a definite smoking gun for the compact
tetraquark model. We show that the $X(6900)$, a likely $ccar{c}ar{c}$
compact state, is a perfect candidate for this search, and estimate a
production cross section ranging from around $250$ nb to $1150$ nb, depending
on its quantum numbers. Furthermore, we discuss the importance of
ultra-peripheral collisions to the search for the scalar and tensor partners of
the $X(3872)$ predicted by the diquarkonium model, and not yet observed. The
completion of such a flavor-spin multiplet would strongly speak in favor of the
compact tetraquark model. | | Source: | arXiv, 2109.10359 | | Services: | Forum | Review | PDF | Favorites | |
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