scholarly journals STATUS OF CHIRAL DOUBLERS OF HEAVY-LIGHT HADRONS IN LIGHT OF RECENT BABAR, CLEO, BELLE AND SELEX Ds STATES

2005 ◽  
Vol 20 (02n03) ◽  
pp. 229-239 ◽  
Author(s):  
MACIEJ A. NOWAK
Keyword(s):  
Heavy Quark ◽  
Chiral Symmetry ◽  
Main Idea ◽  
Spin Symmetry ◽  
Spin Parity ◽  
Quark Spin ◽  
New States ◽  
Heavy Quark Spin Symmetry ◽  
Effective Theories ◽  
Chiral Partner

We explain the main idea of the chiral doublers scenario, originating from simultaneous constraints of chiral symmetry and of heavy quark spin symmetry on effective theories of heavy-light hadrons. In particular we discuss chiral doublers for mesons, chiral doublers for excited mesons, chiral doublers for baryons and chiral doublers for excited baryons. We point out the arguments why new states Ds(2317) and Ds(2457) might be viewed as chiral doublers of Ds and [Formula: see text]. Then we comment on non-strange mesons D0(2308) and D′1(2427) observed by Belle and Focus, and on Θc(3099) signal observed by H1. Finally, we point out that very recent discovery by SELEX of Ds(2632), if confirmed by other experiments and if spin-parity of this state is 1-, may be interpreted as a signal for chiral doubler of Ds1(2536). Such an identification implies another narrow, spin-parity 2-Ds state ca 37 MeV above the new 1-, corresponding to chiral partner of Ds2.

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

scholarly journals CHARMING BARYONS

2014 ◽  
Vol 26 ◽  
pp. 1460124
Author(s):  
C. GARCIA-RECIO ◽  
L. L. SALCEDO ◽  
D. GAMERMANN ◽  
J. NIEVES ◽  
O. ROMANETS ◽  
...  
Keyword(s):  
Heavy Quark ◽  
Spin Symmetry ◽  
Flavor Symmetry ◽  
Minimal Extension ◽  
Heavy Flavor ◽  
Vector Mesons ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
Experimental Values

We study odd-parity baryonic resonances with one heavy and three light flavors, dynamically generated by meson-baryon interactions. Special attention is paid to Heavy Quark Spin Symmetry (HQSS), hence pseudoscalar and vector mesons and baryons with Jπ = 1/2+ and 3/2+ are considered as constituent hadrons. For the hidden-charm sector ([Formula: see text]), the meson-baryon Lagrangian with Heavy Flavor Symmetry is constructed by a minimal extension of the SU(3) Weinberg-Tomozawa (WT) Lagrangian to fulfill HQSS, such that not new parameters are needed. This interaction can be presented in different formal ways: as a Field Lagrangian, as Hadron creation-annihilation operators, as SU(6)×HQSS group projectors and as multichannel matrices. The multichannel Bethe-Salpeter equation is solved for odd-parity light baryons, hidden-charm N and Δ and Beauty Baryons (Λb). Results of calculations with this model are shown in comparison with other models and experimental values for baryonic resonances.

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