The new LHCb beauty-strange state as the bottom partner of the Ds0*(2317): a LQCD constrained coupled-channel chiral analysis
Abstract
The LHCb Collaboration has observed a narrow state in the B̅s0π0 spectrum, about 74 MeV below the B-K+ threshold, which is the natural candidate for the bottom partner of the Ds0*(2317). Such a state had been predicted as a B̅K bound state by unitarized heavy-meson chiral perturbation theory with lattice-QCD input. We analyze the LHCb spectrum with these coupled-channel amplitudes, including isospin breaking through the physical meson masses, π0-η mixing, and mu≠ md in the chiral amplitudes, thereby allowing the B̅s0* to decay through its only open strong channel, B̅s0π0. With the parameters fixed by lattice QCD and no experimental input from the LHCb measurement, the predicted state lies within 1.1-1.7 standard deviations of the observed peak. Adjusting a single parameter, the spectrum is described as well as with the zero-width limit of the LHCb analysis. The new state thus emerges naturally from these amplitudes, with a large B̅K component and an isospin-violating width of tens of keV, and its JP=1+ heavy-quark spin partner is predicted with a precision comparable to that of the measured mass.
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BibTeX
@misc{albaladejo2026lhcb,
title = {{The new LHCb beauty-strange state as the bottom partner of the $D_s0^*(2317)$: a LQCD constrained coupled-channel chiral analysis}},
author = {Miguel Albaladejo and Pablo Encarnación and Albert Feijoo and Juan M. Nieves},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.38022},
eprint = {2609.38022},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.38022},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - The new LHCb beauty-strange state as the bottom partner of the D_s0^*(2317): a LQCD constrained coupled-channel chiral analysis
AU - Miguel Albaladejo
AU - Pablo Encarnación
AU - Albert Feijoo
AU - Juan M. Nieves
PY - 2026
DA - 2026/09/29
PB - arXiv
DO - 10.48550/arxiv.2609.38022
UR - https://arxiv.org/abs/2609.38022
AB - The LHCb Collaboration has observed a narrow state in the B̅_s^0π^0 spectrum, about 74 MeV below the B^-K^+ threshold, which is the natural candidate for the bottom partner of the D_s0^*(2317). Such a state had been predicted as a B̅K bound state by unitarized heavy-meson chiral perturbation theory with lattice-QCD input. We analyze the LHCb spectrum with these coupled-channel amplitudes, including isospin breaking through the physical meson masses, π^0-η mixing, and m_u≠ m_d in the chiral amplitudes, thereby allowing the B̅_s0^* to decay through its only open strong channel, B̅_s^0π^0. With the parameters fixed by lattice QCD and no experimental input from the LHCb measurement, the predicted state lies within 1.1-1.7 standard deviations of the observed peak. Adjusting a single parameter, the spectrum is described as well as with the zero-width limit of the LHCb analysis. The new state thus emerges naturally from these amplitudes, with a large B̅K component and an isospin-violating width of tens of keV, and its J^P=1^+ heavy-quark spin partner is predicted with a precision comparable to that of the measured mass.
ER -