2015/07/28 by Yu-Ji Shi, Wei Wang
Mathematics · Physics and Astronomy · #Black Holes and Theoretical Physics #Chiral perturbation theory #Collider #Electron #Geometry #Invariant mass #KEKB #Lepton #Mathematics #Muon #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Pi #Pion #Quantum Chromodynamics and Particle Interactions #Scalar (mathematics) #Semileptonic decay #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.92.074038
published as Phys. Rev. D 92, 074038 (2015) · 15 pages,9 figures
arxiv created 2015/07/28 · openalex publication_date 2015/10/26 · arxiv updated 2015/10/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In this work, we study the semileptonic decay modes Bs0\ensuremath→\ensuremathπ+\ensuremathπ^\ensuremath-\ensuremathℓ+\ensuremathℓ^\ensuremath- and Ds+\ensuremath→\ensuremathπ+\ensuremathπ^\ensuremath-\ensuremathℓ+\ensuremathν in the kinematics region where the \ensuremathπ+\ensuremathπ^\ensuremath- system has a invariant mass in the range 0.5--1.3 GeV. These processes are valuable towards the determination of S-wave \ensuremathπ+\ensuremathπ^\ensuremath- light-cone distribution amplitudes whose normalizations are scalar form factors. We compare the results for scalar form factors predicted in unitarized chiral perturbation theory and extracted from the data on the Bs\ensuremath→J/\ensuremathψ\ensuremathπ+\ensuremathπ^\ensuremath-. Then the Bs\ensuremath→\ensuremathπ+\ensuremathπ^\ensuremath- and Ds\ensuremath→\ensuremathπ+\ensuremathπ^\ensuremath- form factors are calculated in light-cone sum rules, based on which predictions for differential decay widths are made. The results are in good agreement with the experimental data on the Bs and Ds decays into \ensuremathπ+\ensuremathπ^\ensuremath-. More accurate measurements at BEPC, LHC and KEKB in the future will be helpful to examine our formalism and constrain the input parameters more precisely.