2015/10/26 by Tianhong Wang, Yue Jiang, Wan-Li Ju +2
Physics and Astronomy · #Amplitude #Branching fraction #Electromagnetic radiation #Exponential decay #Mixing (physics) #Particle decay #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Quantum and Classical Electrodynamics #hep-ex #hep-ph
paper · pdf · doi:10.1007/jhep03(2016)209
published as JHEP 03 (2016) 209 · 9 pages, 3 figures, 3 tables
arxiv created 2015/10/26 · openalex publication_date 2016/03/01 · openalex created_date 2016/06/24 · arxiv updated 2021/11/05 · openalex updated_date 2026/08/05
We calculate the electromagnetic (EM) decay widths of the B ± (2S) meson, which is observed recently by the ATLAS Collaboration. The main EM decay channels of this particle are 13 S 1 γ and 1Pγ, which, in literature, are estimated to have the branching ratio of about 1/10. In this work, we get the partial decay widths: Γ(21 S 0 → 13 S 1 γ) = 0.192 keV, Γ(21 S 0 → 1P 1 γ) = 2.24 keV and Γ(21 S 0 → 1P 1 ′ γ) = 11.4 keV. In the calculation, the instantaneous approximated Bethe-Salpeter method is used. For the P-wave B c mesons, the wave functions are given by mixing the 3 P 1 and 1 P 1 states. Within the Mandelstam formalism, the decay amplitude is given, which includes the relativistic corrections.