Heavy quark spin in an S-wave meson-antimeson state

2014 ◽  
Vol 29 ◽  
pp. 1460234
Author(s):  
Yan-Rui Liu
Keyword(s):  
Angular Momentum ◽  
Heavy Quark ◽  
Total Angular Momentum ◽  
Strong Decay ◽  
S Wave ◽  
Spin Wave Function ◽  
Decay Channels ◽  
Exotic Mesons ◽  
Quark Spin ◽  
Molecular Picture

The newly observed exotic mesons above [Formula: see text] threshold were widely discussed in the molecular picture. To understand deeper their structures, we here discuss the spin ([Formula: see text]) of a heavy quark-antiquark pair in an S-wave meson-antimeson system by constructing explicitly the spin wave function. One finds two selection rules for [Formula: see text] (a) the total angular momentum J is larger than the maximum angular momentum of the light degree of freedom or smaller than the minimum one; (b) JC = 1+, 2-, 3+, ⋯ if the two mesons are different but belong to the same doublet. This feature may be used to constrain possible strong decay channels.

scholarly journals Heavy-quark spin-symmetry partners of Zb(10610) and Zb(10650) molecules

2019 ◽  
Vol 218 ◽  
pp. 08005
Author(s):  
V. Baru ◽  
E. Epelbaum ◽  
A. A. Filin ◽  
C. Hanhart ◽  
A. V. Nefediev
Keyword(s):  
Heavy Quark ◽  
Bound States ◽  
Spin Symmetry ◽  
Mass Splitting ◽  
Quantum Numbers ◽  
Quark Spin ◽  
Heavy Quark Spin Symmetry ◽  
Tensor Part ◽  
Coupled Channel ◽  
Molecular Picture

Heavy-quark spin-symmetry (HQSS) partners of the isovector bottomonium like states Zb(10610) and Zb(10650) are predicted within the molecular picture. Treating both Zb’s as shallow bound states, we solve the system of coupled-channel integral equations for the contact plus one-pion exchange (OPE) potentials to predict the location of the partner states with the quantum numbers J++ (J = 0,1,2). In particular, we predict the existence of a narrow tensor 2++ state residing a few MeV below the B∗ B¯∗ threshold. It is emphasised that the tensor part of the OPE potential in combination with HQSS breaking due to the nonvanishing B∗ -B mass splitting has a significant impact on the location of this partner state.

scholarly journals The $X_0(2900)$ and its heavy quark spin partners in molecular picture

2020 ◽  
Author(s):  
MeiWei Hu ◽  
Xueyi Lao ◽  
Pan Ling ◽  
Qian Wang
Keyword(s):  
Heavy Quark ◽  
Quark Spin ◽  
Molecular Picture

scholarly journals N AND Δ HIDDEN-CHARM RESONANCES WITH HEAVY-QUARK SPIN SYMMETRY

2014 ◽  
Vol 26 ◽  
pp. 1460108
Author(s):  
OLENA ROMANETS ◽  
CARMEN GARCÍA-RECIO ◽  
LORENZO LUIS SALCEDO ◽  
JUAN NIEVES ◽  
LAURA TOLÓS
Keyword(s):  
Heavy Quark ◽  
Bound States ◽  
Wave Interaction ◽  
Spin Symmetry ◽  
S Wave ◽  
Coupled Channels ◽  
Quark Spin ◽  
Charm Baryon ◽  
Heavy Quark Spin Symmetry ◽  
Baryon Resonances

We study N and Δ hidden-charm baryon resonances that are generated dynamically from the s-wave interaction of pseudoscalar and vector mesons with 1/2+ and 3/2+ baryons. We use a unitary coupled-channels model that fulfills heavy-quark spin symmetry and respects spin-flavor symmetry in the light sector. We predict seven N-like and five Δ-like states with masses around 4 GeV, most of them as bound states. Some of these states form heavy-quark spin multiplets, which are almost degenerate in mass.

scholarly journals Total Angular Momentum Dichroism of the Terahertz Vortex Beams at the Antiferromagnetic Resonances

2021 ◽  
Vol 126 (15) ◽  
Author(s):  
A. A. Sirenko ◽  
P. Marsik ◽  
L. Bugnon ◽  
M. Soulier ◽  
C. Bernhard ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Total Angular Momentum ◽  
Vortex Beams

scholarly journals QUARK ORBITAL ANGULAR MOMENTUM IN THE BARYON

2001 ◽  
Vol 16 (22) ◽  
pp. 3673-3697 ◽  
Author(s):  
XIAOTONG SONG
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Orbital Motion ◽  
Magnetic Moments ◽  
Sum Rule ◽  
Quark Spin ◽  
Quark Flavor ◽  
Quark Orbital Angular Momentum ◽  
Quark Flavors ◽  
Partition Factor

Analytical and numerical results, for the orbital and spin content carried by different quark flavors in the baryons, are given in the chiral quark model with symmetry breaking. The reduction of the quark spin, due to the spin dilution in the chiral splitting processes, is transferred into the orbital motion of quarks and antiquarks. The orbital angular momentum for each quark flavor in the proton as a function of the partition factor κ and the chiral splitting probability a is shown. The cancellation between the spin and orbital contributions in the spin sum rule and in the baryon magnetic moments is discussed.

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