What can radiative decays of the X(3872) teach us about its nature?

Abstract

Starting from the hypothesis that the X(3872) is a $D{\bar{D}}^{\ast }$ molecule, we discuss the radiative decays of the X(3872) into $\gamma J/\psi$ and $\gamma {\psi }^{\prime }$ from an effective field theory point of view. We show that radiative decays are very weakly sensitive to the long-range structure of the X(3872). In particular, contrary to earlier claims, we argue that the experimentally determined ratio of the mentioned branching fractions is not in conflict with a wave function of the X(3872) that is dominated by the $D{\bar{D}}^{\ast }$ hadronic molecular component.

arXiv commentLaTeX2e, 10 pages, 1 figure, 2 tables, version ot appear in Phys.Lett.B

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• Multiquark States
• Chiral perturbation theory for heavy hadrons and chiral effective field theory for heavy hadronic molecules
• Weak decays of heavy hadrons into dynamically generated resonances
• Heavy-quark spin and flavour symmetry partners of the X(3872) revisited: what can we learn from the one boson exchange model?
• Doubly-heavy tetraquarks
• Heavy hadronic molecules with pion exchange and quark core couplings: a guide for practitioners
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• Strong decays of higher charmonium states into open-charm meson pairs
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• Hadronic Loops versus Factorization in EFT calculations of $X(3872)\to {\chi }_{cJ}{\pi }^0$
• Note on X(3872) production at hadron colliders and its molecular structure
• Establishing the heavy quark spin and light flavor molecular multiplets of the $X(3872)$, $Z_c(3900)$ and $X(3960)$
• Exotic Doubly Charmed Ds0*(2317)D and Ds1*(2460)D* Molecules
• Production of the $T_{cc}^{+}$ state in the $\gamma p\to D^{+}{\bar{T}}_{cc}^{-}{\Lambda }_c^{+}$ reaction
• $D\Xi$ and $D^{\ast }\Xi$ Molecular States from One Boson Exchange
• Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review
• Triangle singularity in the $B^{-}\to K^{-}{\pi }^{0}X(3872)$ reaction and sensitivity to the $X(3872)$ mass
• Heavy-hadron molecular spectrum from light-meson exchange saturation
• Heavy- and light-flavor symmetry partners of the $T_{cc}^{+}(3875)$, the $X(3872)$ and the $X(3960)$ from light-meson exchange saturation
• The new $P_{\mathrm{cs}}(4459)$, $Z_{\mathrm{cs}}(3985)$, $Z_{\mathrm{cs}}(4000)$ and $Z_{\mathrm{cs}}(4220)$ and the possible emergence of flavor pentaquark octets and tetraquark nonets
• Radiative decays of the spin-$2$ partner of $X(3872)$
• Open charm-bottom axial-vector tetraquarks and their properties
• Exotic Hadrons at LHCb
• $X(3872)$ as virtual companion pole of the charm-anticharm state ${\chi }_{c1}(2P)$
• Dimesonic states with the heavy-light flavour mesons
• The $D^{\ast }{D}^{\ast }\bar{D}$ and $D^{\ast }{D}^{\ast }{\bar{D}}^{\ast }$ Three-Body Systems
• Can X(3915) be the tensor partner of the X(3872)?
• Possible precise measurements of the $X(3872)$ mass with the $e^{+}{e}^{-}\to {\pi }^0\gamma X(3872)$ and $p\bar{p}\to \gamma X(3872)$ reactions
• Probing the nature of the ${\chi }_{c1}(3872)$ state using radiative decays
• Production of the $X(4014)$ as the spin-2 partner of $X(3872)$ in $e^{+}{e}^{-}$ collisions
• Charmonium description from a generalized screened potential model
• The nature of ${\chi }_{c1}\left(3872\right)$ and $T_{cc}^{+}\left(3875\right)$
• Are the XYZ states unconventional states or conventional states with unconventional properties?
• Radiative decay of the $X(3872)$ as a mixed molecule-charmonium state in effective field theory
• The role of electromagnetic interaction in the $X(3872)$ and its analogs
• Tetraquarks in the Born-Oppenheimer approximation
• Study of $e^{+}{e}^{-}\to \omega X(3872)$ and $\gamma X(3872)$ from 4.66 to 4.95 GeV
• A short review on the compositeness of the $X(3872)$
• Production of $1^{-+}$ exotic charmonium-like states in electron-positron collisions
• Photoproduction of the $X(3872)$ beyond vector meson dominance: the open-charm coupled-channel mechanism
• Theory Concepts for Heavy Exotic Mesons
• Two nearby states in the $X(3872)$ region: Resolving the radiative-decay ratio tension with ${\eta }_{c2}$
• The effects of charmonium on the properties of the $1^{++}$ hidden charm poles in effective field theory
• Hadronic molecules and multiquark states
• Study of conventional and non-conventional scalar and vector mesons
• Test of the $X(3872)$ Structure in Antiproton-Nucleus Collisions
• What can we learn from the radiative decays of the $D_{s1}(2460)$ meson?
• Electromagnetic probes revealing the inner structure of the ${\Lambda }_c(2940)$
• Exotic hadrons associated with $b$-quark
• Radiative decays of hadronic molecules: From confusion to inspiration