Revisiting two-body charmed anti-charmed baryonic B decays
Abstract
The study of two-body charmed anti-charmed baryonic B̅→ bf Bc bf B̅c decays using the topological amplitude approach is revisited. We include the b→ uu̅ q contributions, in addition to the b→ cc̅ q contributions, to these decays. The topological decomposition of B̅→ bf Bc(bf 3̅f) bf B̅c(bf 3f), bf Bc(bf 6f) bf B̅c(bf 3f), bf Bc(bf 3̅f) bf B̅c(bf 6̅f) and bf Bc(bf 6f) bf B̅c(bf 6̅f) decay amplitudes are updated accordingly. Although the b→ uu̅ q contributions are Cabibbo-Kobayashi-Maskawa (CKM) suppressed in ΔS=−1 transitions, their effects are significantly amplified in ΔS=0 transitions, as the relative size of the CKM factors in b→ uu̅ q and b→ cc̅ q contributions in ΔS=0 transitions is enlarged by λ−2, roughly a factor of 20, from the one in ΔS=−1 transitions. Present data in B̅→ bf Bc(bf 3̅f) bf B̅c(bf 3f) decay rates allow or even slightly prefer non-negligible b→ uu̅ q contributions. These b→ uu̅ q contributions can allow much larger rates for B-→ Ξc0 Ξ̅c−, B̅s0→ Λc+ Ξ̅c− and B̅0→ Ξc+ Ξ̅c− decays than those only have b→ cc̅ d contributions. Several modes containing only b→ uu̅ q contributions in B̅→ bf Bc(bf 6f) bf B̅c(bf 3f), bf Bc(bf 3̅f) bf B̅c(bf 6̅f) decays are also identified. Measuring these decays will be interesting and useful in clarifying the role of b→ uu̅ q contributions in two-body charmed anti-charmed baryonic B̅ decays.
Related
- U-spin sum rules in charmed baryon decays beyond the U-spin limit
- Charmed baryon decays at BESIII
- Nonleptonic decays of the double-charmed baryon Ξcc+ with dynamically determined baryon wave functions
- Charmed baryon semileptonic decays in a relativistic three-quark model
- Revisiting Bc(*) production in Z-boson decays at NLO in QCD
BibTeX
@misc{chua2026revisiting,
title = {{Revisiting two-body charmed anti-charmed baryonic $B$ decays}},
author = {Chun-Khiang Chua},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.08053},
eprint = {2609.08053},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.08053},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Revisiting two-body charmed anti-charmed baryonic B decays
AU - Chun-Khiang Chua
PY - 2026
DA - 2026/09/11
PB - arXiv
DO - 10.48550/arxiv.2609.08053
UR - https://arxiv.org/abs/2609.08053
AB - The study of two-body charmed anti-charmed baryonic B̅→ bf B_c bf B̅_c decays using the topological amplitude approach is revisited. We include the b→ uu̅ q contributions, in addition to the b→ cc̅ q contributions, to these decays. The topological decomposition of B̅→ bf B_c(bf 3̅_f) bf B̅_c(bf 3_f), bf B_c(bf 6_f) bf B̅_c(bf 3_f), bf B_c(bf 3̅_f) bf B̅_c(bf 6̅_f) and bf B_c(bf 6_f) bf B̅_c(bf 6̅_f) decay amplitudes are updated accordingly. Although the b→ uu̅ q contributions are Cabibbo-Kobayashi-Maskawa (CKM) suppressed in ΔS=−1 transitions, their effects are significantly amplified in ΔS=0 transitions, as the relative size of the CKM factors in b→ uu̅ q and b→ cc̅ q contributions in ΔS=0 transitions is enlarged by λ^−2, roughly a factor of 20, from the one in ΔS=−1 transitions. Present data in B̅→ bf B_c(bf 3̅_f) bf B̅_c(bf 3_f) decay rates allow or even slightly prefer non-negligible b→ uu̅ q contributions. These b→ uu̅ q contributions can allow much larger rates for B^-→ Ξ_c^0 Ξ̅_c^−, B̅_s^0→ Λ_c^+ Ξ̅_c^− and B̅^0→ Ξ_c^+ Ξ̅_c^− decays than those only have b→ cc̅ d contributions. Several modes containing only b→ uu̅ q contributions in B̅→ bf B_c(bf 6_f) bf B̅_c(bf 3_f), bf B_c(bf 3̅_f) bf B̅_c(bf 6̅_f) decays are also identified. Measuring these decays will be interesting and useful in clarifying the role of b→ uu̅ q contributions in two-body charmed anti-charmed baryonic B̅ decays.
ER -