V. Riquer
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View article: Open charm tetraquarks in broken SU(3)_F symmetry
Open charm tetraquarks in broken SU(3)_F symmetry Open
Prompted by a recent lattice QCD calculation, we review the SU(3) light quark flavor structure of charmed tetraquarks with spin-0 diquarks. Fermi statistics forces the three light quarks to be in the representation 3*x3*= 3+6*. This agrees…
View article: The Pentaquark Spectrum from Fermi Statistics
The Pentaquark Spectrum from Fermi Statistics Open
We study compact hidden charm pentaquarks in the Born-Oppenheimer approximation, previously introduced for tetraquarks, assuming the heavy pair to be in a color octet. We show that Fermi statistics applied to the complex of the three light…
View article: Doubly Heavy Tetraquarks in the Born-Oppenheimer approximation
Doubly Heavy Tetraquarks in the Born-Oppenheimer approximation Open
Tetraquarks QQq*q* are found to be described remarkably well with the Quantum Chromodynamics version of the Hydrogen bond, as treated with the Born-Oppenheimer approximation. We show the robustness of the method by computing the mass of th…
View article: Substructure of Multiquark Hadrons (Snowmass 2021 White Paper)
Substructure of Multiquark Hadrons (Snowmass 2021 White Paper) Open
In recent years there has been a rapidly growing body of experimental evidence for existence of exotic, multiquark hadrons, i.e. mesons which contain additional quarks, beyond the usual quark-antiquark pair and baryons which consist of mor…
View article: From the lineshape of the $X(3872)$ to its structure
From the lineshape of the $X(3872)$ to its structure Open
From a study of the lineshape of the $X(3872)$, the LHCb collaboration measures a sizeable negative effective range. This cannot be reconciled with a shallow $D\bar{D}^*$ bound state hypothesis. Based on Weinberg's compositeness criterion,…
View article: Radiative and Meson Decays of Y(4230) in Flavor SU(3)
Radiative and Meson Decays of Y(4230) in Flavor SU(3) Open
The charmonium-like exotic states Y(4230) and the less known Y(4320), produced in e+e− collisions, are sources of positive parity exotic hadrons in association with photons or pseudoscalar mesons. We analyze the radiative and pion decay ch…
View article: Radiative and Meson Decays of <i>Y</i>(4230) in Flavor SU(3)
Radiative and Meson Decays of <i>Y</i>(4230) in Flavor SU(3) Open
The charmonium-like exotic states and the less known , produced in collisions, are sources of positive parity exotic hadrons in association with photons or pseudoscalar mesons. We analyze the radiative and pion decay channels in the comp…
View article: The new resonances Z_{cs}(3985) and Z_{cs}(4003) (almost) fill two\n tetraquark nonets of broken SU(3)_f
The new resonances Z_{cs}(3985) and Z_{cs}(4003) (almost) fill two\n tetraquark nonets of broken SU(3)_f Open
New data from BESIII and LHCb show the existence of resonances with\nstrangeness filling multiplets of the broken SU(3)_f symmetry, with the pattern\npredicted by the quark model. This is the case of the newly discovered Z_{cs}\n(3985) and…
View article: The new resonances Z_{cs}(3985) and Z_{cs}(4003) (almost) fill two tetraquark nonets of broken SU(3)_f
The new resonances Z_{cs}(3985) and Z_{cs}(4003) (almost) fill two tetraquark nonets of broken SU(3)_f Open
New data from BESIII and LHCb show the existence of resonances with strangeness filling multiplets of the broken SU(3)_f symmetry, with the pattern predicted by the quark model. This is the case of the newly discovered Z_{cs} (3985) and Z_…
View article: Hydrogen bond of QCD in doubly heavy baryons and tetraquarks
Hydrogen bond of QCD in doubly heavy baryons and tetraquarks Open
In this paper we present in greater detail previous work on the Born-Oppenheimer approximation to treat the hydrogen bond of QCD, and add a similar treatment of doubly heavy baryons. Doubly heavy exotic resonances X and Z can be described …
View article: Hydrogen bond of QCD
Hydrogen bond of QCD Open
Using the Born-Oppenheimer approximation, we show that exotic resonances, X\nand Z, may emerge as QCD molecular objects made of colored two-quark lumps,\nstates with heavy-light diquarks spatially separated from antidiquarks. With\nthe sam…
View article: Fully covering the MSSM Higgs sector at the LHC
Fully covering the MSSM Higgs sector at the LHC Open
In the context of the Minimal Supersymmetric extension of the Standard Model (MSSM), we reanalyze the search for the heavier CP-even $H$ and CP-odd $A$ neutral Higgs bosons at the LHC in their production in the gluon-fusion mechanism and t…
View article: Hidden-beauty charged tetraquarks and heavy quark spin conservation
Hidden-beauty charged tetraquarks and heavy quark spin conservation Open
Assuming the dominance of the spin-spin interaction in a diquark, we point out that the mass difference in the beauty sector M(Z_b^prime) - M(Z_b) scales with quark masses as expected in QCD, with respect to the corresponding mass differen…