Chiral partners of strange doubly heavy baryons: Mass relations and decay predictions after the 2026 LHCb discoveries
Abstract
Three spectacular LHCb measurements in 2026---the observations of Ωcc+, Ξcc+, and the beauty-strange structure Bs0*(5700)0---make possible an experimentally constrained analysis of chiral partners of strange doubly heavy baryons. The doubly charmed masses test the earlier Ma--Harada prediction and support a compact, internally S-wave cc color source. We combine this comparison with the heavy-quark--diquark hyperfine relation and with chiral gaps from the theory of chiral doublers, to construct consistent ccs and bbs parity multiplets and a conditional extension to bcs. Under meson-to-baryon parity-gap transfer, the $349$ MeV input from the Ds sector gives negative-parity ccs targets near $4.075$ and $4.183$ GeV. The separate $332$ MeV input from the Bs sector fixes the bbs partner masses relative to their unknown ground-state mass, conditional on the new beauty-strange state's chiral-partner assignment. We relate the differences of hyperfine splittings in the two parity sectors of mesons and baryons, and identify equal reduced single-pion widths, an E1 reduced-width ratio 1:8:4:5, and a kaon selection rule whose leading predictions contain no new transition parameters. Absolute widths are estimated by matching the published Bardeen--Eichten--Hill and Harada--Rho--Sasaki meson calculations to a common convention. In the reference calculation, all members of the predicted ccs and bbs multiplets are narrow. In the proposed ΩQQπ0 and ΩQQγ searches at LHCb, these states are expected to produce peaks dominated by detector resolution, allowing their masses and decay patterns to be investigated even when their intrinsic widths remain unresolved. The upper charm state is above kaon threshold but protected in the spectator limit.
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BibTeX
@misc{nowak2026chiral,
title = {{Chiral partners of strange doubly heavy baryons: Mass relations and decay predictions after the 2026 LHCb discoveries}},
author = {Maciej A. Nowak and Ismail Zahed},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.16841},
eprint = {2610.16841},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.16841},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Chiral partners of strange doubly heavy baryons: Mass relations and decay predictions after the 2026 LHCb discoveries
AU - Maciej A. Nowak
AU - Ismail Zahed
PY - 2026
DA - 2026/10/12
PB - arXiv
DO - 10.48550/arxiv.2610.16841
UR - https://arxiv.org/abs/2610.16841
AB - Three spectacular LHCb measurements in 2026---the observations of Ω_cc^+, Ξ_cc^+, and the beauty-strange structure B_s0^*(5700)^0---make possible an experimentally constrained analysis of chiral partners of strange doubly heavy baryons. The doubly charmed masses test the earlier Ma--Harada prediction and support a compact, internally S-wave cc color source. We combine this comparison with the heavy-quark--diquark hyperfine relation and with chiral gaps from the theory of chiral doublers, to construct consistent ccs and bbs parity multiplets and a conditional extension to bcs. Under meson-to-baryon parity-gap transfer, the $349$ MeV input from the D_s sector gives negative-parity ccs targets near $4.075$ and $4.183$ GeV. The separate $332$ MeV input from the B_s sector fixes the bbs partner masses relative to their unknown ground-state mass, conditional on the new beauty-strange state's chiral-partner assignment. We relate the differences of hyperfine splittings in the two parity sectors of mesons and baryons, and identify equal reduced single-pion widths, an E1 reduced-width ratio 1:8:4:5, and a kaon selection rule whose leading predictions contain no new transition parameters. Absolute widths are estimated by matching the published Bardeen--Eichten--Hill and Harada--Rho--Sasaki meson calculations to a common convention. In the reference calculation, all members of the predicted ccs and bbs multiplets are narrow. In the proposed Ω_QQπ^0 and Ω_QQγ searches at LHCb, these states are expected to produce peaks dominated by detector resolution, allowing their masses and decay patterns to be investigated even when their intrinsic widths remain unresolved. The upper charm state is above kaon threshold but protected in the spectator limit.
ER -