Study of form factors and observables in Bc−→ Ds∗ −ℓ+ℓ− and Bc−→ Ds∗ −ν ν̅ decays
- 1Indian Institute of Technology Guwahati
Abstract
A bstract : We investigate the decays Bc−→ Ds(∗ )−ℓ+ℓ− B c − → D s ∗ − ℓ + ℓ − and Bc−→ Ds(∗ )−ν ν̅ B c − → D s ∗ − ν ν ¯ within the Standard Model (SM), employing perturbative QCD (pQCD) form factors that are sensitive to the wave functions of B c and Ds(∗ ) D s ∗ mesons. We determine the shape parameters of these mesons and the Bc→ Ds(∗ ) B c → D s ∗ form factors at q ² = 0 from available lattice QCD inputs for Bs→ Ds(∗ ) B s → D s ∗ and B c → D s transitions. To obtain the q ² dependence of the Bc→ Ds∗ B c → D s ∗ form factors, we employ heavy-quark spin symmetry (HQSS) and an appropriate parametrization scheme over the allowed q ² region. Based on these inputs, we present predictions for branching ratios and lepton-flavour-sensitive observables. Furthermore, we perform a detailed angular analysis of the cascade decay Bc−→ Ds∗ −(→ Ds−π0)ℓ+ℓ− B c − → D s ∗ − → D s − π 0 ℓ + ℓ − , providing Standard Model predictions for several angular observables.
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BibTeX
@article{dey2026study,
title = {{Study of form factors and observables in $$ B_c^-\to D_s^\ast -\ell^+\ell^- $$ and $$ B_c^-\to D_s^\ast -\nu \overline\nu $$ decays}},
author = {Utsab Dey and Soumitra Nandi},
journal = {Journal of High Energy Physics},
year = {2026},
month = oct,
doi = {10.1007/jhep10(2026)016},
url = {https://link.springer.com/10.1007/JHEP10(2026)016},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Study of form factors and observables in B_c^−→ D_s^∗ −ℓ^+ℓ^− and B_c^−→ D_s^∗ −ν ν̅ decays
AU - Utsab Dey
AU - Soumitra Nandi
PY - 2026
DA - 2026/10/01
JO - Journal of High Energy Physics
DO - 10.1007/jhep10(2026)016
UR - https://link.springer.com/10.1007/JHEP10(2026)016
AB - A bstract : We investigate the decays B_c^−→ D_s^(∗ )−ℓ^+ℓ^− B c − → D s ∗ − ℓ + ℓ − and B_c^−→ D_s^(∗ )−ν ν̅ B c − → D s ∗ − ν ν ¯ within the Standard Model (SM), employing perturbative QCD (pQCD) form factors that are sensitive to the wave functions of B c and D_s^(∗ ) D s ∗ mesons. We determine the shape parameters of these mesons and the B_c→ D_s^(∗ ) B c → D s ∗ form factors at q ² = 0 from available lattice QCD inputs for B_s→ D_s^(∗ ) B s → D s ∗ and B c → D s transitions. To obtain the q ² dependence of the B_c→ D_s^∗ B c → D s ∗ form factors, we employ heavy-quark spin symmetry (HQSS) and an appropriate parametrization scheme over the allowed q ² region. Based on these inputs, we present predictions for branching ratios and lepton-flavour-sensitive observables. Furthermore, we perform a detailed angular analysis of the cascade decay B_c^−→ D_s^∗ −(→ D_s^−π^0)ℓ^+ℓ^− B c − → D s ∗ − → D s − π 0 ℓ + ℓ − , providing Standard Model predictions for several angular observables.
SN - 1029-8479
ER -