Abstract
Heavy-quark spin symmetry is explicitly broken by the mass splitting between a heavy-light pseudoscalar meson and its vector partner. This fact plays a pivotal role in the physics of states whose mass lies close to the threshold of an open-flavor meson pair, like X(3872). We show that this source of heavy-quark spin symmetry breaking can be systematically included within the diabatic representation of the Born-Oppenheimer approximation. We verify that including all the appropriate coupled channels guarantees conservation of total angular momentum, parity, and charge-conjugation parity. This marks a fundamental step towards a unified, first-principles study of quarkonia and meson molecules with hidden flavor.
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Acknowledgments
I wish to express my gratitude to E. Braaten for his indispensable help in developing this project. I acknowledge valuable discussions with P. González. This research was supported by the U.S. Department of Energy under Grant No. DE-SC0011726.
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Bruschini, R. Heavy-quark spin symmetry breaking in the Born-Oppenheimer approximation. J. High Energ. Phys. 2023, 219 (2023). https://doi.org/10.1007/JHEP08(2023)219
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DOI: https://doi.org/10.1007/JHEP08(2023)219