SMEFT restrictions on exclusive b → uℓν decays

Jun 15, 2023
42 pages
Published in:
  • JHEP 11 (2023) 023
  • Published: Nov 6, 2023
e-Print:
Report number:
  • CERN-TH-2023-111

Citations per year

202320242025491
Abstract: (Springer)
Exclusive semileptonic b hadron decays (b → uℓν) serve as a sandbox for probing strong and electroweak interactions and for extracting the CKM element Vub_{ub}. Instead, this work investigates their underexplored potential to reveal new short-distance physics. Utilizing SMEFT as a conduit to chart territory beyond the SM, we demonstrate that substantive new physics contributions in b → uℓν are necessarily linked to correlated effects in rare neutral-current b decays, neutral B meson mixing or high-mass Drell-Yan tails. We find that measurements of the latter processes strongly restrict the allowed deviations in the former. A complete set of tree-level mediators, originating from a perturbative ultraviolet model and matching at dimension 6, is thoroughly explored to support this assertion. As a showcase application, we examine the feasibility of a new physics interpretation of the recent tension in exclusive |Vub_{ub}| extraction from B → Vℓν where V = (ρ, ω).
Note:
  • 42 pages, 9 figures, 3 tables
  • Semi-Leptonic Decays
  • SMEFT
  • Specific BSM Phenomenology
  • new physics
  • effective field theory
  • operator: dimension: 6
  • operator: flavor changing
  • bottom: semileptonic decay
  • B0: semileptonic decay
  • decay: flavor changing