Is the anomalous decay ratio ofDsJ(2632)due to isospin breaking?

2004/07/02 by Luciano Maiani, L. Maiani, F. Piccinini +2 · 4 citations
Physics and Astronomy · #Annihilation #High-Energy Particle Collisions Research #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quark #hep-ph

paper · pdf · doi:10.1103/physrevd.70.054009

published as Phys.Rev.D70:054009,2004 · 3 pages, 1 figure

arxiv created 2004/07/02 · openalex publication_date 2004/09/08 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Quark pair annihilation into gluons is suppressed at large momenta due to the asymptotic freedom. As a consequence, mass eigenvalues of heavy states should be almost diagonal with respect to up and down quark masses, thereby breaking isospin. We suggest the particle observed by the SELEX Collaboration, D_sJ(2632), to be to a good extent a [cd][ds] state, which would explain why its D⁰K⁺ mode is anomalously suppressed with respect to D_s⁺\ensuremathη. Predictions for the rates of the yet unobserved modes D_s⁺\ensuremathπ⁰ and D⁺K⁰ are given.

Citations

• Diquarks and Exotic Spectroscopy
• New Look at Scalar Mesons
• φ-meson and unitary symmetry model
• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)

Cited by

• Comprehensive Four-Quark Interpretation ofDs(2317),Ds(2457), andDs(2632)
• DsJ+(2632): An excellent candidate of tetraquarks
• Multichannel Calculation ofDs*Vector States and theDsJ+(2632)Resonance
• Regge-trajectory analysis ofDSJ⋆(2317)±,DSJ(2460)±andDSJ(2632)+mesons