Author:
Esposito Angelo,Ferreiro Elena G.,Pilloni Alessandro,Polosa Antonio D.,Salgado Carlos A.
Abstract
AbstractThe structure of exotic resonances that do not trivially fit the usual quark model expectations has been a matter of intense scientific debate during the last two decades. A possible way of estimating the size of these states is to study their behavior when immersed in QCD matter. Recently, LHCb has measured the relative abundance of the exotic $$X(3872)$$
X
(
3872
)
over the ordinary $$\psi (2S)$$
ψ
(
2
S
)
. We use the comover interaction model to study the yield of a compact $$X(3872)$$
X
(
3872
)
. To confirm the reliability of the model in high-multiplicity pp collisions, we describe the suppression of excited over ground $$\Upsilon $$
Υ
states. With this at hand, we show that the size of the compact $$X(3872)$$
X
(
3872
)
would be slightly larger than that of the $$\psi (2S)$$
ψ
(
2
S
)
. If the $$X(3872)$$
X
(
3872
)
is instead assumed to be a meson molecule of large size, we argue that its evolution in QCD matter should be described via a coalescence model, as suggested by data on deuteron production. We show that the predictions of this model for the $$X(3872)$$
X
(
3872
)
are in contrast with data.
Publisher
Springer Science and Business Media LLC
Subject
Physics and Astronomy (miscellaneous),Engineering (miscellaneous)
Cited by
29 articles.
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