Colour octet contribution in exclusive P-wave charmonium decay into proton-antiproton

  title={Colour octet contribution in exclusive P-wave charmonium decay into proton-antiproton},
  author={S.M.H. Wong},
  journal={Nuclear Physics},
  • S.M.H. Wong
  • Published 1 March 1999
  • Physics
  • Nuclear Physics
Abstract In inclusive P-wave charmonium decay, to cancel infrared divergence in the colour singlet contribution requires the inclusion of the colour octet which becomes degenerate with the former in the infrared limit. In the corresponding exclusive decay, such an infrared divergence does not exist. On this ground, it becomes doubtful whether the colour octet is needed in exclusive reactions. A contradiction in the underlying picture, however, would result once all strong decay channels are… 
7 Citations

Figures and Tables from this paper

Color octet contribution in exclusive P-wave charmonium decay
Abstract Recent advances in our understanding of the higher-wave quarkonia have generated much interests in quarkonium physics. However most are devoted to inclusive decays and productions.
Implications of light-quark admixtures on charmonium decays into meson pairs
We argue that charmonium decays into meson pairs fall into two distinct classes: one that is under control of perturbative QCD and another one that is governed by a soft mechanism. We concentrate on
Angular Distributions for ψ' Sequential Decays into 2(π+π-)p(p-)γ via XcJ
Amplitudes for ψ(2S) sequential decays into 2(π+π-)p(p-)γ via XcJ are constructed in effective coupling scheme. A Mote-Carlo simulation is carried out to study angular distributions of the decayed
Study of χ c J decaying into ϕ K * (892 )K ̄
This work is supported in part by National Key Basic Research Program of China under Contract No. 2015CB856700; National Natural Science Foundation of China (NSFC) under Contracts No. 10935007, No.
First observations of $\psi(2S)$ and $\chi_{cJ}(1P)$ decays to four-body final states $h^+h^- K^0_S K^0_S$
$\chi_{c0}$, $\chi_{c1}$, and $\chi_{c2}$ decays to $\pi^+\pi^-K^0_SK^0_S$ and $K^+K^-K^0_SK^0_S$, as well as $\psi(2S)$ decay to $\pi^+\pi^-K^0_SK^0_S$ are presented. The branching fractions of


Colour-octet contributions to exclusive charmonium decays
Abstract We investigate the theoretical uncertainties of P-wave charmonium decays into two pions, χcJ → π+π−, π0π0. Constraining the pion distribution-amplitude from the recent precise data on Fπγ( Q
Calculation of the annihilation rate of P wave quark-antiquark bound states
Abstract In the framework of the gauge theory of strong interactions (in particular for the charm scheme) we calculate the annihilation rates of P wave quark-antiquark bound states of J PC = 0 ++ , 2
Exclusive decays of heavy mesons into baryons
We analyze the decays of heavy meson resonances into baryon-antibaryon final states within the formalism of exclusive processes in QCD. The decay of JPC = 2++ states into proton-antiproton pairs is
Higher Fock states and power counting in exclusive $P$-wave quarkonium decays
Abstract. Exclusive processes at large momentum transfer $Q$ factor into perturbatively calculable short-distance parts and long-distance hadronic wave functions. Usually, only contributions from
Singular binding dependence in the hadronic widths of 1++ and 1+− heavy quark antiquark bound states
The annihilation rates into hadrons of P-wave heavy quark-antiquark bound states are calculated within SU(3) colour gauge theory (in particular for the charm scheme). An interesting feature we find
Hadroproduction of quarkonium in fixed-target experiments.
We analyze charmonium and bottomonium production at fixed-target experiments. We find that the inclusion of color octet production channels removes large discrepancies between experiment and the
Exclusive Processes in Perturbative Quantum Chromodynamics
We present a systematic analysis in perturbative quantum chromodynamics (QCD) of large-momentum-transfer exclusive processes. Predictions are given for the scaling behavior, angular dependence,
Exclusive ${J/\psi}$ and ${\psi'}$ decays into baryon-antibaryon pairs
Abstract. Within a perturbative approach we investigate decays of charmonium states into baryon-antibaryon pairs. Using a recently proposed wave function for the nucleon and suitable generalizations
Mass corrections in J/ psi -->BB-bar decay and the role of distribution amplitudes.
  • Murgía, Melis
  • Physics, Medicine
    Physical review. D, Particles and fields
  • 1995
The relevance of the features of the baryon distribution amplitudes are shown and the electromagnetic corrections to the QCD results are estimated.
Exclusive decays of heavy mesons
Abstract In order to describe quantitatively the strong or weak decays of heavy particles into two π(K)-mesons one needs to know the behaviour of the π-meson wave function ϕ π ( x ) which determines