Heavy Quark Hadrons and Exotics a challenge for QCD

Journal Article · Fri Oct 21 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3647404· OSTI ID:21611930

Lipkin, Harry J ^[1]; Karliner, Marek ^[2]

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1. Department of Particle Physics, Weizmann Institute of Science, Rehovot 76100 (Israel) and High Energy Physics Division, Argonne National Laboratory, Argonne, IL 60439-4815 (United States)
2. Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv (Israel)

Exotic hadrons with heavy quarks can confirm in the same multiquark system that the qq-bar interaction is much stronger than the qq interaction and produces color structures totally different from those of normal hadrons. Unusual heavy tetraquark structure may explain unusual properties of newly discovered mesons like the X(3872). Both charged and neutral B decays produce this narrow neutral resonant state that decays to both J/{psi}{rho} and J/{psi}{omega}, while no charged resonances in the same multiplet are found. This suggests that the X is an isoscalar resonance whose production conserves isospin, while isospin is violated only in the decay by an electromagnetic interaction allowing the isospin-forbidden J/{psi}{rho} decay. New data for X production in B decays provide a separation between production and decay, sharpen several experimental puzzles and impose serious constraints on all models. A proposed isoscalar tetraquark model agrees with all present data, conserves isospin in its production and breaks isospin only in an electromagnetic X(3872)J/{psi}{rho}{sup o} decay. The narrow X decay width results from the tiny phase space available for the J/{psi}{omega} decay and enables competition with the electromagnetic isospin-forbidden J/{psi}{rho} decay which has much larger phase space. Experimental tests are proposed for this isospin production invariance.

• OSTI ID: 21611930
• Journal Information: AIP Conference Proceedings, Vol. 1388, Issue 1; Conference: BARYONS' 10: International conference on the structure of baryons, Osaka (Japan), 7-11 Dec 2010; Other Information: DOI: 10.1063/1.3647404; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B QUARKS
C QUARKS
COLOR MODEL
ELECTROMAGNETIC INTERACTIONS
ISOSPIN
J PSI-3097 MESONS
NEUTRAL CURRENTS
OMEGA-782 MESONS
PARTICLE DECAY
PARTICLE WIDTHS
PHASE SPACE
QUANTUM CHROMODYNAMICS
RHO-770 MESONS
STRONG INTERACTIONS
SYMMETRY BREAKING
T QUARKS
ALGEBRAIC CURRENTS
BASIC INTERACTIONS
BEAUTY PARTICLES
BOSONS
CHARM PARTICLES
CHARMONIUM
COMPOSITE MODELS
CURRENTS
DECAY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
HADRONS
INTERACTIONS
MATHEMATICAL MODELS
MATHEMATICAL SPACE
MESONS
PARTICLE MODELS
PARTICLE PROPERTIES
POSTULATED PARTICLES
QUANTUM FIELD THEORY
QUARK MODEL
QUARKONIUM
QUARKS
SPACE
TOP PARTICLES
VECTOR MESONS