Exotic resonances due to η exchange

Marek Karliner; Jonathan L. Rosner

doi:10.1016/j.nuclphysa.2016.03.057

Exotic resonances due to η exchange

Marek Karliner^*, Jonathan L. Rosner

^*Corresponding author for this work

School of Physics and Astronomy

The University of Chicago

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

The meson X(3872) and several related states appear to be in large part hadronic molecules in which a heavy flavored meson (e.g., D⁰) is bound to another heavy meson (e.g., D¯^⁎0). Although not the only contribution to the binding, pion exchange seems to play a crucial role in generating the longest-range force between constituents. Mesons without u and d light quarks (such as D_s) cannot exchange pions, but under suitable conditions can bind as a result of η exchange. Channels in which this mechanism is possible are identified, and suggestions are made for searches for the corresponding molecular states, including a manifestly exotic baryonic Λ_cD¯_s^⁎ resonance decaying into J/ψΛ.

Original language	English
Pages (from-to)	365-370
Number of pages	6
Journal	Nuclear Physics A
Volume	954
DOIs	https://doi.org/10.1016/j.nuclphysa.2016.03.057
State	Published - 1 Oct 2016

Funding

Funders	Funder number
Division of High Energy Physics	DE-FG02-13ER41958
U.S. Department of Energy

Keywords

Exotic hadrons
Heavy quarks
QCD
Quark model

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10.1016/j.nuclphysa.2016.03.057

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title = "Exotic resonances due to η exchange",

abstract = "The meson X(3872) and several related states appear to be in large part hadronic molecules in which a heavy flavored meson (e.g., D0) is bound to another heavy meson (e.g., D¯⁎0). Although not the only contribution to the binding, pion exchange seems to play a crucial role in generating the longest-range force between constituents. Mesons without u and d light quarks (such as Ds) cannot exchange pions, but under suitable conditions can bind as a result of η exchange. Channels in which this mechanism is possible are identified, and suggestions are made for searches for the corresponding molecular states, including a manifestly exotic baryonic ΛcD¯s⁎ resonance decaying into J/ψΛ.",

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AU - Rosner, Jonathan L.

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N2 - The meson X(3872) and several related states appear to be in large part hadronic molecules in which a heavy flavored meson (e.g., D0) is bound to another heavy meson (e.g., D¯⁎0). Although not the only contribution to the binding, pion exchange seems to play a crucial role in generating the longest-range force between constituents. Mesons without u and d light quarks (such as Ds) cannot exchange pions, but under suitable conditions can bind as a result of η exchange. Channels in which this mechanism is possible are identified, and suggestions are made for searches for the corresponding molecular states, including a manifestly exotic baryonic ΛcD¯s⁎ resonance decaying into J/ψΛ.

AB - The meson X(3872) and several related states appear to be in large part hadronic molecules in which a heavy flavored meson (e.g., D0) is bound to another heavy meson (e.g., D¯⁎0). Although not the only contribution to the binding, pion exchange seems to play a crucial role in generating the longest-range force between constituents. Mesons without u and d light quarks (such as Ds) cannot exchange pions, but under suitable conditions can bind as a result of η exchange. Channels in which this mechanism is possible are identified, and suggestions are made for searches for the corresponding molecular states, including a manifestly exotic baryonic ΛcD¯s⁎ resonance decaying into J/ψΛ.

KW - Exotic hadrons

KW - Heavy quarks

KW - QCD

KW - Quark model

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Exotic resonances due to η exchange

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