The Strong Decay Properties of the 1−+Hybrid Mesons

Peng-Zhi Huang,Shi-Lin Zhu,Hua-Xing Chen

doi:10.1051/epjconf/20122001002

Abstract

We calculate the coupling constants of the decay modes 1 + ! ,f1 , b1 , , 0 , a1 , f1 within the framework of the light-cone QCD sum rule. Then we cal- culate the partial widths of these decay channels, which di er greatly from the existing calculations using phenomenological models. For the isovector 1 + state, the dominant decay modes are ; f1 . For its isoscalar partner, its dominant decay mode is a1 . We also discuss the possible search of the 1 + state at BESIII, for example through the decay chains J= ( 0 )! 1 + or J= ( 0 )! 1 + where 1 can be reconstructed through the decay modes 1 ! ! + 0 or 1 ! f1(1285) 0 . Hopefully the present work will be helpful to the experimental establishment of the 1 + hybrid meson.

Highlights

The quark model has been proved to be very successful in the classification of hadrons and calculation of hadron spectrum and their other properties
Quantum chromodynamics (QCD), which is widely accepted as the fundamental theory of the strong interaction, does not prohibit the existence of those hadron states which cannot be accommodated in the conventional quark model
We have studied the major strong decay modes of the JPC = 1−+ hybrid mesons, including the isovector and the isoscalar cases

Summary

Introduction

The quark model has been proved to be very successful in the classification of hadrons and calculation of hadron spectrum and their other properties. Swanson, and Szczepaniak [13] (PSS) extended the original IKP flux tube model and studied the strong decays of hybrid mesons with different JPC quantum numbers, including those of the 1−+. Zhu reexamined the decay channels 1−+ → ρπ, f1π by using the light-cone QCD sum rules and reduced the partial width of 1−+ → ρπ significantly [18]. We suggest the possible search for the 1−+ hybrid mesons at BESIII

Strong decays of π1

B B B s1 s2 σ1

Partial decay widths

Conclusion