Heavy quarkonium production through the semi-exclusivee+e−annihilation channels round theZ0peak

2013/02/28 by Zhan Sun, Z. Sun, Xing-Gang Wu +4 · 11 citations
Physics and Astronomy · #Annihilation #Excited state #High-Energy Particle Collisions Research #Nuclear physics #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Propagator #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #Quarkonium #Singlet state #hep-ph

paper · pdf · doi:10.1103/physrevd.87.114008

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 87(11) (American Physical Society) · 28 pages, 20 figures, 15 tables. to be published in Phys.Rev.D. We are grateful for the anonymous referee's comments and suggestions that substantially improve the manuscript

arxiv created 2013/05/23 · openalex publication_date 2013/06/06 · arxiv updated 2013/06/10 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Within the framework of the nonrelativistic quantum chromodynamics, we present a detailed discussion on the heavy quarkonium production at the leading order in \ensuremathα_s at a e⁺e^\ensuremath- collider with the collision energy around the Z⁰ peak. Quarkonia are produced through the semi-exclusive channels e⁺e^\ensuremath-\ensuremath→|H_QQ⟩+X with X=QQ or gg, where Q indicates a heavy quark (respectively, b or c). It is noted that in addition to the color-singlet 1S-level quarkonium states, the 2S and 1P color-singlet states and the color-octet |(QQ)[1³S₁⁽⁸⁾]g⟩ state also provide sizable contributions. The heavy quarkonium transverse momentum and rapidity distributions for the e⁺e^\ensuremath- collision energy E_cm=m_Z are presented. For both charmonium and bottomonium production via the Z⁰ propagator, there is approximate ``spin degeneracy'' between the spin-triplet and spin-singlet quarkonium states. Uncertainties for the total cross sections are estimated by taking m_c=1.50\ifmmode±\else\textpm\fi0.15 GeV and m_b=4.90\ifmmode±\else\textpm\fi0.15 GeV. Around E_cm=m_Z, due to the Z⁰-boson resonance effect, total cross sections for the channels via the Z⁰-propagator become much larger than the channels via the virtual photon propagator. We conclude that, in addition to the B factories such as BABAR and Belle, and the hadronic colliders such as Tevatron and LHC, such a super Z factory will present an excellent platform for studying the heavy quarkonium properties.

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