scholarly journals Heavy Quark Spin Symmetry Violating Hadronic Transitions of Higher Charmonia

2018 ◽  
Author(s):  
M. Naeem Anwar ◽  
Yu Lu ◽  
Bing-Song Zou
Keyword(s):  
Heavy Quark ◽  
Spin Symmetry ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
Hadronic Transitions

scholarly journals HADRONIC TRANSITIONS FROM ϒ(4S) AS A PROBE OF FOUR-QUARK ADMIXTURE

2011 ◽  
Vol 26 (11) ◽  
pp. 773-778 ◽  
Author(s):  
M. B. VOLOSHIN
Keyword(s):  
Heavy Quark ◽  
Spin Symmetry ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
Hadronic Transitions

It is argued that the observed enhancement of the hadronic transition ϒ(4S) → ϒ(1S)η relative to ϒ(4S) → ϒ(1S)ππ can be explained if the resonance ϒ(4S) contains an admixture of a four-quark component, possibly due to the coupling to the meson channel [Formula: see text]. A test of the discussed mechanism by searching for the transition ϒ(4S) → ϒ(1S)η′(958) is suggested. Some properties of possible four-quark states related to the suggested one by the heavy quark spin symmetry are also discussed.

HYPERFINE MIXING IN b → c SEMILEPTONIC AND ELECTROMAGNETIC DECAYS OF DOUBLY HEAVY bc BARYONS

2014 ◽  
Vol 26 ◽  
pp. 1460107
Author(s):  
C. ALBERTUS ◽  
E. HERNÁNDEZ ◽  
J. NIEVES
Keyword(s):  
Heavy Quark ◽  
Quark Mass ◽  
Semileptonic Decay ◽  
Spin Symmetry ◽  
Mass Limit ◽  
Electromagnetic Decays ◽  
Heavy Quark Mass ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
Symmetry Relations

We show that semileptonic and electromagnetic decays involving spin-1/2 doubly heavy bc baryons are very sensitive to hyperfine mixing in their wave functions. We further show how heavy quark spin symmetry relations, obtained in the infinite heavy quark mass limit and near zero recoil, could be used to extract the admixtures in a model independent way from semileptonic decay data. On the other hand the infinite heavy quark mass limit gives wrong predictions in the electromagnetic case.

scholarly journals Enhanced breaking of heavy quark spin symmetry

2014 ◽  
Vol 738 ◽  
pp. 172-177 ◽  
Author(s):  
Feng-Kun Guo ◽  
Ulf-G. Meißner ◽  
Cheng-Ping Shen
Keyword(s):  
Heavy Quark ◽  
Spin Symmetry ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry
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