Decay constants of the Bc mesons with vector and tensor currents
- 1Universität Bonn
Abstract
We calculate the decay constants of the lowest-lying Bc B c mesons in the spin-parity channels JP = 0-, 0+, 1-, 1+ J P = 0 - , 0 + , 1 - , 1 + , commonly referred to as the Bc, Bc0*, Bc*, Bc1 B c , B c 0 ∗ , B c ∗ , B c 1 mesons, respectively. Within the framework of QCD sum rules, we consider the decay constants associated with both the (axial-)vector and (axial-)tensor interpolating currents. The decay constants with (axial-)vector currents have already been studied in the literature. We refine previous QCD sum rule results by including higher-order power corrections and performing a comprehensive uncertainty analysis. Furthermore, we provide the first determination of the (axial-)tensor decay constants of the Bc* B c ∗ and Bc1 B c 1 mesons. These new results will not only improve theoretical predictions for purely leptonic Bc B c decays, but also strengthen unitarity constraints on b → c b → c form factors, thereby improving the precision of predictions for B̅ → D(*) ℓ ν ̅ B ¯ → D ( ∗ ) ℓ ν ¯ decays and the determination of |Vcb| | V cb | .
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BibTeX
@article{reina2026decay,
title = {{Decay constants of the $$B_c$$ mesons with vector and tensor currents}},
author = {Eduard Costa i Reina and Nico Gubernari and Zachary Wüthrich},
journal = {The European Physical Journal C},
year = {2026},
month = oct,
doi = {10.1140/epjc/s10052-026-16381-w},
url = {https://link.springer.com/article/10.1140/epjc/s10052-026-16381-w},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Decay constants of the B_c mesons with vector and tensor currents
AU - Eduard Costa i Reina
AU - Nico Gubernari
AU - Zachary Wüthrich
PY - 2026
DA - 2026/10/22
JO - The European Physical Journal C
DO - 10.1140/epjc/s10052-026-16381-w
UR - https://link.springer.com/article/10.1140/epjc/s10052-026-16381-w
AB - We calculate the decay constants of the lowest-lying B_c B c mesons in the spin-parity channels J^P = 0^-, 0^+, 1^-, 1^+ J P = 0 - , 0 + , 1 - , 1 + , commonly referred to as the B_c, B_c0^*, B_c^*, B_c1 B c , B c 0 ∗ , B c ∗ , B c 1 mesons, respectively. Within the framework of QCD sum rules, we consider the decay constants associated with both the (axial-)vector and (axial-)tensor interpolating currents. The decay constants with (axial-)vector currents have already been studied in the literature. We refine previous QCD sum rule results by including higher-order power corrections and performing a comprehensive uncertainty analysis. Furthermore, we provide the first determination of the (axial-)tensor decay constants of the B_c^* B c ∗ and B_c1 B c 1 mesons. These new results will not only improve theoretical predictions for purely leptonic B_c B c decays, but also strengthen unitarity constraints on b → c b → c form factors, thereby improving the precision of predictions for B̅ → D^(*) ℓ ν ̅ B ¯ → D ( ∗ ) ℓ ν ¯ decays and the determination of |V_cb| | V cb | .
SN - 1434-6044
SN - 1434-6052
ER -