Pseudoscalar Quarkonium Exclusive Decays to Vector Meson Pair

Abstract

The pseudoscalar quarkonia exclusive decays to light mesons still poses a challenge to the theoretical understanding of quarkonium properties in decay. In this work, we evaluate the processes of pseudoscalar heavy quarkonium decays into vector meson pairs, especially the helicity suppressed processes of ${\eta }_b\to J/\psi J/\psi$ and ${\eta }_c\to VV$. In the frame of NRQCD, the branching fraction of $Br[{\eta }_b\to J/\psi J/\psi ]$ are evaluated at the next-to-leading order of perturbative QCD; and within the light-cone distribution formalism, we calculate also the higher twist effects in these processes. Numerical results show that the higher twist terms contribute more than what from the NLO QCD corrections in the process of ${\eta }_b\to J/\psi J/\psi$. It is found that the experimental results on ${\eta }_c\to VV$ are hard to be understood by merely the quark model and perturbative QCD calculation.

14 pages, 1 figure

References in corpus (28)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Automatized One-Loop Calculations in 4 and D dimensions
• Generating Feynman Diagrams and Amplitudes with FeynArts 3
• Symmetry-breaking corrections to heavy-to-light B meson form factors at large recoil
• B_{d,s}->rho, omega, K*, phi Decay Form Factors from Light-Cone Sum Rules Revisited
• Higher Twist Distribution Amplitudes of Vector Mesons in QCD: Formalism and Twist Three Distributions
• NLO Production and Decay of Quarkonium
• The $\rho$ Meson Light-Cone Distribution Amplitudes of Leading Twist Revisited
• Observation of Y(3940) -> J/psi omega in B -> J/psi omega K at BABAR
• Observation of the bottomonium ground state in the decay Upsilon(3S) -> gamma eta_b
• FIESTA 2: parallelizeable multiloop numerical calculations
• Twist-4 Distribution Amplitudes of the K${}^{\ast }$ and $\varphi$ Mesons in QCD
• NRQCD Analysis of Bottomonium Production at the Tevatron
• SU(3) Breaking in K and K* Distribution Amplitudes
• Measurement of the eta_b(1S) mass and the branching fraction for Upsilon(3S) --> gamma eta_b(1S)
• Photon transitions in Upsilon(2S) and Upsilon(3S)
• Observation potential for eta_b at the Tevatron
• Implications of light-quark admixtures on charmonium decays into meson pairs
• Search for gammagamma -> eta_b in e+e- collisions at LEP2
• Hunting eta_b through radiative decay into J/psi
• Exclusive $et{a}_b$ decay to double $J/\psi$ at next-to-leading order in $alph{a}_s$
• Which hadronic decay modes are good for ${\eta }_b$ searching: double $J/\psi$ or something else?
• A study of the Okubo-Zweig-Iizuka rule violations in ${\eta }_c\to VV$
• Decay eta_b->J/ψJ/ψin light cone formalism
• The study of double vector charmonium mesons production at B-factories within light cone formalism
• Search for eta_b in two-photon collisions at LEP II with the DELPHI detector
• Experimental study of \etac decays into vector-vector final states

Cited by in corpus (15)

• The Physics of the B Factories
• Coupling QCD-scale axion-like particles to gluons
• Bridging light-cone and NRQCD approaches: asymptotic behavior of $B_c$ electromagnetic form factor
• Updated study of the ${\eta }_c$ and ${\eta }_c^{\prime }$ decays into light vector mesons
• Relativistic Corrections to the Exclusive Decays of C-even Bottomonia into S-wave Charmonium Pairs
• Exclusive decay of ${\rm Y}$ into $J/\psi +{\chi }_{c0,1,2}$
• Exclusive decay of P-wave Bottomonium into double J/ψ
• Search for double charmonium decays of the P-wave spin-triplet bottomonium states
• The Exclusive Decay of Upsilon into $h_c$, the $X(3940)$ and $X(4160)$
• P-wave Quarkonium Decays to Meson Pairs
• Evidence of ${\rm Y}(1S)\to J/\psi +{\chi }_{c1}$ and search for double-charmonium production in ${\rm Y}(1S)$ and ${\rm Y}(2S)$ decays
• Observation of ${\eta }_c\to \omega \omega$ in $J/\psi \to \gamma \omega \omega$
• NLO corrections to ${\chi }_{bJ}$ to two-$J/\psi$ exclusive decay processes
• Relativistic corrections to ${\rm Y}$ exclusive decay into double $S-$wave charmonia
• Improved measurements of branching fractions for ${\eta }_c\to \varphi \varphi$ and $\omega \varphi$