The Study On Double Heavy Baryon Production In γ(1s) Decay

Υ(1S)decay provides an important and unique place to study quantum chromo-dynamics and hadron physics.Some of the hadronic decay channels that have been measured so far account for only a small part of their total decay channels,so there is still much room for development.The Υ(1S)→J/Ψ+X process was measured by the CLEO collaboration and the BELLE collaboration,and a lot of theoretical work has been carried out.Υ(1S)→J/Ψ+ccg has an important contribution to this process,and the color analysis of the final state of this process shows that the double heavy bary-on bound state(ccq)is possible to produce.We apply non-relativistic effective theory to deal with the decay and production of bound states.The production of the final stateΞcc can be factored into two stages.The first stage is the production of cc quark pair.The second stage is the translation of cc quark pair into double heavy baryon,which belongs to the category of quantum chromodynamics.Due to Pauli exclusion principle,cc quark pair can be into two states,one is in the spin triplet state and color anti-triplet state,the other is in the spin singlet state and color sextuple state.We have studied the dependence of the decay width with on the charm quark mass mc.The double baryonΞcc momentum distribution is also presented.The SELEX collaboration and LHCb col-laboration have measured signals.Our result can shed light on the measurement of Ξcc at B factory...