scholarly journals Two-photon decay of heavy quarkonium from heavy-quark spin symmetry

2007 ◽  
Author(s):  
T. N. Pham ◽  
Pietro Colangelo ◽  
Donato Creanza ◽  
Fulvia De Fazio ◽  
Rosa Anna Fini ◽  
...  
Keyword(s):  
Heavy Quark ◽  
Spin Symmetry ◽  
Heavy Quarkonium ◽  
Two Photon ◽  
Photon Decay ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry

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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