Excited Heavy Quarkonium Production via Z⁰ Decays at a High Luminosity Collider

2015/05/31 by Qi-Li Liao, Yan Yu, Ya Deng +2 · 2 citations
Physics and Astronomy · #hep-ph

paper · pdf · doi:10.1103/physrevd.91.114030

published as Phys. Rev. D 91, 114030 (2015) · 10 pages, 13 figures. arXiv admin note: substantial text overlap with arXiv:1408.5563

arxiv created 2015/06/26 · arxiv updated 2015/07/01

Abstract

We present a systematic study of the production of the heavy quarkonium, i.e., |(cc)[n] ⟩ , |(bc)[n] ⟩ (or |(cb)[n] ⟩), and |(bb)[n] ⟩ quarkonium [|(QQ')[n]⟩ quarkonium for short], through Z⁰ boson semi-exclusive decays with new parameters \citelx for the heavy quarkonium under the framework of the NRQCD, where [n] stands for n¹S₀, n³S₁, n¹P₀, n³P_J (n=1, ⋯, 6; J=(0, 1, 2)). "Improved trace technology" is adopted to derive the simplified analytic expressions at the amplitude level, which shall be useful for dealing with these decay channels. If all higher |(QQ')[n]⟩ quarkonium states decay to the ground state |(QQ')[1¹S₀]⟩ with 100% efficiency via electromagnetic or hadronic interactions, we obtain Γ(Z⁰→ |(cc)[1¹S₀]⟩)=1476 KeV, Γ(Z⁰→ |(bc)[1¹S₀]⟩)=1485 KeV, Γ(Z⁰→ |(bb)[1¹S₀]⟩)=127.5 KeV. At the LHC and ILC with the luminosity \cal L∝ 10³⁴cm^-2s^-1, sizable heavy quarkonium events can be produced through Z⁰ boson decays, i.e., about 5.9~×10⁵ (cc), 6.0~×10⁵ (bc) (or (cb)), 5.1~×10⁴ (bb) events per year can be obtained.

Citations

• Heavy quarkonium wave functions at the origin and excited heavy quarkonium production via top quark decays at the LHC

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