Does the JPC = 1+− counterpart of the X(3872) exist? by Pablo G. Ortega, David R. Entem, Francisco Fernández

“…We explore the possible existence of the JPC=1+− counterpart of the X(3872) state in a coupled-channels calculation within a constituent quark model, with the aim of confirming the existence of the so-called X˜(3872) state observed by the COMPASS Collaboration. …”
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Intriguing aspects of light baryon resonances by Khemchandani K. P., Martínez Torres A., Kim Sang-Ho, Nam Seung-il, Hosaka A., Nagahiro H.

“…Besides pointing out the hadron resonances which clearly require description beyond the quark model, we focus on the third s11, N∗ state and its decay to final states consisting of the lightest hyperon resonances which have a partial width comparable to that for the decay to πN. …”
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Search for radiative penguin decays B+ → ρ+γ,B0 → ρ0γ, and B0 → ωγ by Aubert, B, Barate, R, Boutigny, D, Couderc, F, Gaillard, J, Hicheur, A, Karyotakis, Y, Lees, J, Tisserand, V, Zghiche, A, Palano, A, Pompili, A, Chen, J, Qi, N, Rong, G, Wang, P, Zhu, Y, Eigen, G, Ofte, I, Stugu, B, Abrams, G, Borgland, A, Breon, AB, Brown, D, Button-Shafer, J

“…We set the following limits on the individual branching fractions: ℬ(B+ → rho;+γ] < 1.8 × 10-6, ℬ(B0 → ρ0γ < 0.4 × 10-6, and Bscr;(B0 → ωγ) < 1.0 × 10-6 at the 90% confidence level. We use the quark model to limit the combined branching fraction Bscr;̄[B → (ρ/ω) γ] < 1.2 × 10-6, from which we determine a constraint on the ratio of Cabibbo-Kobayashi-Maskawa matrix elements |Vtd|/ |Vts|. © 2005 The American Physical Society.…”

Hadron physics at the COMPASS experiment by Krinner Fabian

“…In the Constituent Quark Model (CQM) two types of hadrons exist: mesons, made out of a quark and an antiquark, and baryons, which consist of three quarks. …”
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Charged-particle multiplicity dependence of charm-baryon-to-meson ratio in high-energy proton-proton collisions by Yu Chen, Min He

“…Taking the full particle listings of PDG complemented by additional charm-baryon states from relativistic quark model predictions, we evaluate the canonical partition function and the charm-hadron chemical factors that measure the canonical suppression arising from the requirement of strict conservation of quantum charges. …”
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Highly excited B, B s and B c meson spectroscopy from lattice QCD by Luke Gayer, Sinéad M. Ryan, David J. Wilson, for the Hadron Spectrum collaboration

“…Working with a large basis of carefully constructed, approximately-local q q ¯ $$ q\overline{q} $$ -like operators we determine a rich spectrum of states up to J = 4 in B, B s and B c , that can be grouped into patterns matching those of the quark model. In addition, hybrid-like states are identified at approximately 1500 MeV above the ground states in each of B, B s and B c , in a multiplet pattern already found in similar computations at a range of quark masses spanning light to bottom. …”
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Hindered magnetic dipole transitions between P-wave bottomonia and coupled-channel effects by Feng-Kun Guo, Ulf-G. Meißner, Zhi Yang

“…In these processes the coupled-channel effects are expected to lead to partial widths much larger than the quark model predictions. We estimate these partial widths which, however, are very sensitive to unknown coupling constants related to the vertices χb0(nP)BB¯. …”
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Flavor exotic triply-heavy tetraquark states in AdS/QCD potential by Halil Mutuk

“…The calculations are carried out in a nonrelativistic quark model with a color interaction described by a potential computed in AdS/QCD. …”
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Modular invariant A4 models for quarks and leptons with generalized CP symmetry by Chang-Yuan Yao, Jun-Nan Lu, Gui-Jun Ding

“…We then apply A 4 modular symmetry to the quark sector to explain quark masses and CKM mixing matrix, the minimal viable quark model is found to contain 10 free real parameters. …”
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Heavy quark dominance in orbital excitation of singly and doubly heavy baryons by Zhen-Yu Li, Guo-Liang Yu, Zhi-Gang Wang, Jian-Zhong Gu

“…In the relativistic quark model, an analysis of the Hamiltonian figures out the mechanism that the excitation mode with lower energy levels is always associated with the heavy quark(s), and the splitting of the energy levels is suppressed by the heavy quark(s). …”
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Revisiting radiative decays of $$1^{+-}$$ 1 + - heavy quarkonia in the covariant light-front approach by Yan-Liang Shi

“…Abstract We revisit the calculation of the width for the radiative decay of a $$1^{+-}$$ 1 + - heavy $$Q \bar{Q}$$ Q Q ¯ meson via the channel $$1^{+-} \rightarrow 0^{-+} +\gamma $$ 1 + - → 0 - + + γ in the covariant light-front quark model. We carry out the reduction of the light-front amplitude in the non-relativistic limit, explicitly computing the leading and next-to-leading order relativistic corrections. …”
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Diquarks and the production of charmed baryons by Hyeongock Yun, Sungsik Noh, Sanghoon Lim, Taesoo Song, Juhee Hong, Aaron Park, Su Houng Lee, Benjamin Dönigus

“…Utilizing a quark model characterized by parameters that effectively replicate the masses of ground state hadrons, we illustrate that (us) or (ds) diquarks exhibit greater compactness in comparison to (ud) diquarks. …”
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Hadron physics at the COMPASS experiment by Krinner Fabian

“…In the Constituent Quark Model (CQM) two types of hadrons exist: mesons, made out of a quark and an antiquark, and baryons, which consist of three quarks. …”
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Chiral symmetry restoration at finite temperature in a model with manifest confinement by L.Ya. Glozman, A.V. Nefediev, R. Wagenbrunn

“…We employ a well-known solvable quark model for QCD in 3+1 dimensions that is chirally symmetric and manifestly confining and argue that while confinement indeed induces dynamical breaking of chiral symmetry at T=0, a chiral restoration phase transition takes place at some critical temperature Tch. …”
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A New Description of Transverse Momentum Spectra of Identified Particles Produced in Proton-Proton Collisions at High Energies by Pei-Pin Yang, Fu-Hu Liu, Raghunath Sahoo

“…The transverse momentum spectra of identified particles produced in high energy proton-proton p+p collisions are empirically described by a new method with the framework of the participant quark model or the multisource model at the quark level, in which the source itself is exactly the participant quark. …”
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Double parton correlations in mesons within AdS/QCD soft-wall models: a first comparison with lattice data by Matteo Rinaldi

“…Here, the pion dPDFs are investigated within different holographic QCD quark models in order to access their basic features. …”
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How can X±(5568) escape detection? by Hong-Wei Ke, Xue-Qian Li

“…Multi-quark states were predicted by Gell-Mann when the quark model was first formulated. Recently, numerous exotic states that are considered to be multi-quark states have been experimentally confirmed (four-quark mesons and five-quark baryons). …”
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Branching fraction measurement of B[superscript +]→ωℓ[superscript +]ν decays by Dujmic, Denis, Sciolla, Gabriella

“…The dependence of the decay rate on q[superscript 2], the invariant mass squared of the leptons, is compared to QCD predictions of the form factors based on a quark model and light-cone sum rules.…”
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Measurement of the properties of the Ξ∗0b baryon by Harnew, N, Cheung, S, Evans, T, Gandini, P, Hadavizadeh, T, Hill, D, Jalocha, P, John, M, Lupton, O, Malde, S, Nandi, A, Topp-Jorgenson, S, Wilkinson, G, The LHCb Collaboration

“…The state is consistent with the JP = 3/2+  Ξb∗ 0 resonance expected in the quark model. This is the most precise determination of the mass and the first measurement of the natural width of this state. …”

Heavy-quark dominance and fine structure of excited heavy baryons $$\Sigma _{Q}$$ Σ Q , $$\Xi '_{Q}$$ Ξ Q ′ and $$\Omega _{Q}$$ Ω Q by Zhen-Yu Li, Guo-Liang Yu, Zhi-Gang Wang, Jian-Zhong Gu

“…Abstract In the framework of the relativized quark model, the calculation of spin-orbit interactions is improved by considering the contribution from the light-quark cluster in a singly heavy baryon. …”
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