Exotic hadron
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Precise Predictions of Charmed-Bottom Hadrons from Lattice QCD Open
We report the ground state masses of hadrons containing at least one charm and one bottom quark using lattice quantum chromodynamics. These include mesons with spin (J) and parity (P), (J^{P}): 0^{-}, 1^{-}, 1^{+}, and 0^{+} and the spin 1…
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Explaining the Many Threshold Structures in the Heavy-Quark Hadron Spectrum Open
Tremendous progress has been made experimentally in the hadron spectrum containing heavy quarks in the last two decades. It is surprising that many resonant structures are around thresholds of a pair of heavy hadrons. There should be a thr…
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Fully-heavy tetraquark spectra and production at hadron colliders Open
Motivated by the observation of exotic structure around 6900MeV in the\n$J/\\psi$-pair mass spectrum using proton-proton collision data by the LHCb\ncollaboration, we study the spectra of fully-heavy tetraquarks within\nBethe-Salpeter equa…
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Deciphering the Nature of X(3872) in Heavy Ion Collisions Open
Exploring the nature of exotic multiquark candidates such as the X(3872) plays a pivotal role in understanding quantum chromodynamics (QCD). Despite significant efforts, consensus on their internal structures is still lacking. As a prime e…
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Structure and decays of hidden heavy pentaquarks Open
We study the hadronic molecular structure of hidden heavy pentaquarks - new\nexotic states composed of charmed/bottom baryons and $D(D^*)/B(B^*)$ mesons.\nBased on the observation of three pentaquark candidates $P_c^+(4312)$,\n$P_c^+(4440)…
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Masses and magnetic moments of hadrons with one and two open heavy quarks: Heavy baryons and tetraquarks Open
In this paper we compute masses and magnetic moments of heavy baryons and tetraquarks with one and two open heavy flavors in a unified framework of the MIT bag model. Using the parameters of the MIT bag model, we confirm that an extra bind…
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Mass spectra of doubly heavy tetraquarks in an improved chromomagnetic interaction model Open
Doubly heavy tetraquark states are the prime candidates for tightly bound exotic states. We present a systematic study of the mass spectra of the $S$-wave doubly heavy tetraquark states $QQ\bar{q}\bar{q}$ ($q=u, d, s$ and $Q=c, b$) with di…
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Weak decays of stable doubly heavy tetraquark states Open
In the light of the recent discovery of the $\Xi^{++}_{cc}$ by LHCb collaboration, we study the stable doubly heavy tetraquarks. These states are compact exotic hadrons which can be approximated as the diquark-anti-diquark correlations. In…
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K⁎ mesons with hidden charm arising from KX(3872) and KZ(3900) dynamics Open
Inspired by the recent discovery of the pentaquark states $P_c(4450)$ and\n$P_c(4380)$, which can be viewed as excited nucleon states with hidden charm,\nwe study the three-body interaction of a kaon and a pair of $D\\bar{D}^*$ in\nisospin…
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Fully heavy pentaquarks Open
Very recently, the LHCb Collaboration reported a fully charmed tetraquark state $X(6900)$ in the invariant mass spectrum of $J/\psi$ pairs. If one $J/\psi$ meson is replaced with a fully charmed baryon, we obtain a fully charmed pentaquark…
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Tetraquarks and Pentaquarks from Quark Model Perspective Open
According to the classification of the quark model, the hadrons going beyond three-quark baryon and quark-antiquark meson pictures are called exotic hadrons. Many new hadrons have been observed since 2003, some of which exhibit exotic beha…
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Fragmentation production of fully-charmed tetraquarks at the LHC Open
The X(6900) resonance, recently discovered in the double-J/ψ channel at the LHCb experiment, has spurred intensive interest in unraveling the nature of the fully charmed tetraquark state. The aim of this paper is to present a model-indepen…
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Nonrelativistic effective field theory for heavy exotic hadrons Open
We propose an effective field theory to describe hadrons with two heavy quarks without any assumption on the typical distance between the heavy quarks with respect to the typical hadronic scale. The construction is based on Non-Relativisti…
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Tetraquark-adequate formulation of QCD sum rules Open
We study details of QCD sum rules \\`a la Shifman-Vainshtein-Zakharov for\nexotic tetraquark states. We point out that duality relations for correlators\ninvolving exotic currents have fundamental differences compared with the\nduality rel…
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The low-lying hidden- and double-charm tetraquark states in a constituent quark model with instanton-induced interaction Open
Spectrum of the low-lying hidden- and double-charm tetraquark states are investigated in a nonrelativistic quark potential model, where the instanton-induced interaction is taken as the residual spin-dependent hyperfine interaction between…
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Doubly heavy tetraquarks in the chiral quark soliton model Open
The chiral quark soliton model has been successfully applied to describe the heavy baryon spectrum, both for charm and bottom, leading to the conclusion that the heavy quark has no effect on the soliton. This suggests that replacing a heav…
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Rich structure of the hidden-charm pentaquarks near threshold regions Open
The recent discoveries and observations of pentaquarks and tetraquarks by high-energy accelerator facilities have accumulated evidence of the existence of multiquark hadrons with heavy quarks, as discussed from the early stage of the predi…
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ATLAS results on exotic hadronic resonances Open
Recent results from the proton-proton collision data taken by the ATLAS experiment on exotic resonances are presented. A search for $J/\\psi\\ p$ resonances in $\\Lambda_b \\to J/\\psi\\ p K$ decays with large $pK$ invariant masses is repo…
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Ground state heavy tetraquark production in heavy quark fragmentation Open
During recent years, the study of exotic hadrons including tetraquarks and pentaquarks has attracted a lot of interests and more studies are in progress experimentally and theoretically. It is well-known that at sufficiently large transver…
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Double-Strangeness Molecular-Type Pentaquarks from Coupled-Channel Dynamics Open
The existence of pentaquarks with strangeness content zero and one are major discoveries of the latest years in hadron physics. Most of these states can be understood as hadronic molecules and were predicted prior to their discovery within…
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Deep learning exotic hadrons Open
We perform the first amplitude analysis of experimental data using deep neural networks to determine the nature of an exotic hadron. Specifically, we study the line shape of the P c ( 4312 ) signal reported by the LHCb collaboration, and w…
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Narrow pentaquarks as diquark–diquark–antiquark systems Open
The diquark–diquark–antiquark model describes pentaquark states both in terms of quarks and hadrons. The latest LHCb data for pentaquarks with open charm emphasize the importance of hadron components in the structure of pentaquarks. We dis…
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Recent CMS results on exotic resonances Open
Many exotic resonances have been recently observed at the LHC and other experiments. In this report,\nCMS studies of exotic multiquark states are reported using the data collected in pp collisions at sqrt(S)\n= 13 TeV.
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Exotic hadron naming convention Open
Many new exotic hadrons, that do not fit into the existing naming scheme for hadrons, have been discovered over the past few years. A new scheme is set out, extending the existing protocol, in order to provide a consistent naming conventio…
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Manifestly exotic pentaquarks with a single heavy quark Open
Inspired by the observed X(2900), we study systematically the mass spectra of the ground pentaquark states with the qqqq (Q) over bar (Q = c, b; q = n, s; n = u, d) configuration in the framework of the Chromomagnetic Interaction model. We…
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On the production of hidden-flavored hadronic states at high energy Open
I discuss the production mechanism of hidden-flavored hadrons at high energy.\nUsing $e^+e^-$ collisions and light-meson pair production in high energy\nexclusive processes, I demonstrate that hidden quark pairs do not necessarily\npartici…
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Exotic hadron bound state production at hadron colliders Open
The non-relativistic wave function framework is applied to study the\nproduction and decay of the exotic hadrons which can be effectively described\nas bound states of other hadrons. Employing the factorized formulation, we\ninvestigate th…
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Decay widths of Z <sub> cs </sub>(3985/4000) based on rigorous quark-hadron duality* Open
In this study, we explore the hadronic coupling constants , , and of the exotic states within the pictures of both the tetraquark and molecular states with the tentative assignments based on rigorous quark-hadron duality. Subsequently, we …
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An updated review of the new hadron states Open
The past decades witnessed the golden era of hadron physics. Many excited open heavy flavor mesons and baryons have been observed since 2017. We shall provide an updated review of the recent experimental and theoretical progresses in this …
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Semi-inclusive electroproduction of hidden-charm and double-charm hadronic molecules Open
The semi-inclusive electroproduction of exotic hadrons, including the ${T}_{cc}$, ${P}_{cs}$, and hidden-charm baryon-antibaryon states, is explored under the assumption that they are $S$-wave hadronic molecules of a pair of charmed hadron…