Doubly charmed tetraquarks in a diquark–antidiquark model

Yan, Xiangqiao; Zhong, B.; Zhu, Ruilin

doi:10.1142/s0217751x18500963

Cited by 31 publications

(41 citation statements)

References 117 publications

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“…An additional sign expected from anticommuting fermion fields does not affect our results because it changes only the overall sign for both Eqs. (17) and (18). Our results in the fall-apart modes depend only on the relative signs.…”

Section: A Color and Spin Factors In The Recombinationmentioning

confidence: 53%

“…By combining the color factors in Eqs. (17) and 18with the spin factors in Eqs. (28) and 30, we obtain the corresponding factors for the two-vector modes,…”

Section: A Color and Spin Factors In The Recombinationmentioning

confidence: 99%

“…Theoretically, studies on tetraquarks in hadron spectroscopy are very diverse, ranging from the light mesons composed of u, d, s quarks to the heavy mesons involving charm and bottom quarks. Even for the heavy mesons, the tetraquark investigation is further subdivided into various sectors such as hidden-charm [12][13][14][15], open-charm [16], doubly charmed [17][18][19][20][21] and triple [22] or fully charmed [23][24][25][26], and the similar states with bottom quarks. Eventually a unified approach for tetraquarks is anticipated because all the constituent quarks are bound by the color forces that are in principle independent on quark flavors.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, the color-electric interaction can participate in holding the two quarks in a diquark [18]. Indeed, people are looking for bound states from doubly charmed (ccqq, q ¼ u, d, s) [17][18][19][20][21]; triple (cccq) [22]; or fully charmed (cccc) tetraquarks [23][24][25][26] in the diquarkantidiquark approach even though the heavy diquark, cc, cannot be the spin-0 diquark above. 1 Actually, it is not clear whether the tetraquarks containing cc can form a bound state or not [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Further signatures to support the tetraquark mixing framework for the two light-meson nonets

Kim

Cheoun

et al. 2019

Phys. Rev. D

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In this work, we investigate additional signatures to support the tetraquark mixing framework that has been recently proposed as a possible structure for the two nonets, namely a 0 ð980Þ, K Ã 0 ð800Þ, f 0 ð500Þ, and f 0 ð980Þ in the light nonet and a 0 ð1450Þ, K Ã 0 ð1430Þ, f 0 ð1370Þ, and f 0 ð1500Þ in the heavy nonet. First, we advocate that the two nonets form the flavor nonet approximately satisfying the Gell-Mann-Okubo mass relation. Then we reexamine the mass ordering generated from the tetraquark nonets and show that this mass ordering is satisfied by the two nonets although the ordering in the heavy nonet is marginal. The marginal mass ordering however can be regarded as another signature for tetraquarks because it can be explained partially by the hyperfine masses calculated from the tetraquark mixing framework. The tetraquark mixing parameters are found to be independent of isospins giving additional support for the formation of the flavor nonets. In addition, we discuss the other approaches like two-quark pictures or meson-meson bound states, and their possible limitations in explaining the two nonets. As a peculiar signature distinguished from other approaches, we investigate the fall-apart coupling strengths into two vector mesons from our tetraquarks. Coupling strengths into the two-vector modes are found to enhance strongly in the heavy nonet while they are suppressed in the light nonet. The coupling ratios, which depend on the isospin channel, are found to be huge around ∼15. This trend in the two-vector modes, which is opposite to that in the two-pseudoscalar fall-apart modes, can provide another testing ground for the tetraquark mixing framework. Some experimental evidence related to the phenomena is discussed particularly from the resonances belonging to the heavy nonet.

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Section: A Color and Spin Factors In The Recombinationmentioning

confidence: 53%

“…By combining the color factors in Eqs. (17) and 18with the spin factors in Eqs. (28) and 30, we obtain the corresponding factors for the two-vector modes,…”

Section: A Color and Spin Factors In The Recombinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Further signatures to support the tetraquark mixing framework for the two light-meson nonets

Kim

Cheoun

et al. 2019

Phys. Rev. D

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“…There are many applications of SU(3) flavor symmetry in Refs. [26][27][28][29][30][31][32][33][34][35][36][37][38]. Considering the fact that the light quarks belong to a triplet 3 representation and the heavy quark Q is a singlet in the flavor SU (3) symmetry, the heavy tetraquarks are classified into different irreducible representations as 3 ⊗ 3 ⊗3 = 3 ⊕ 3 ⊕6 ⊕ 15.…”

Section: Spectra Of Heavy Tetraquarks X Cbmentioning

confidence: 99%

Open-charm tetraquark $$X_c$$ and open-bottom tetraquark $$X_b$$

Wang

Zhu

2020

Eur. Phys. J. C

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Motivated by the LHCb observation of exotic states $$X_{0,1}(2900)$$ X 0 , 1 ( 2900 ) with four open quark flavors in the $$D^- K^+$$ D - K + invariant mass distribution in the decay channel $$B^\pm \rightarrow D^+ D^- K^\pm $$ B ± → D + D - K ± , we study the spectrum and decay properties of the open charm tetraquarks. Using the two-body chromomagnetic interactions, we find that the two newly observed states can be interpreted as a radial excited tetraquark with $$J^P=0^+$$ J P = 0 + and an orbitally excited tetraquark with $$J^P=1^-$$ J P = 1 - , respectively. We then explore the mass and decays of the other flavor-open tetraquarks made of $$su {\bar{d}} {\bar{c}}$$ s u d ¯ c ¯ and $$ d s {\bar{u}} {\bar{c}}$$ d s u ¯ c ¯ , which are in the $${\bar{6}}$$ 6 ¯ or 15 representation of the flavor SU(3) group. We point that these two states can be found through the decays: $$X^{(\prime )}_{d s \bar{u}\bar{c}}\rightarrow (D^- K^-, D_s^- \pi ^-) $$ X d s u ¯ c ¯ ( ′ ) → ( D - K - , D s - π - ) , and $$X^{(\prime )}_{s u \bar{d}\bar{c}}\rightarrow D_s^-\pi ^+ $$ X s u d ¯ c ¯ ( ′ ) → D s - π + . We also apply our analysis to open bottom tetraquark $$X_b$$ X b and predict their masses. The open-flavored $$X_b$$ X b can be discovered through the following decays: $$X_{ud{\bar{s}}\bar{b}}\rightarrow B^0K^+$$ X u d s ¯ b ¯ → B 0 K + , $$X^{(\prime )}_{d s \bar{u}\bar{b}}\rightarrow (B^0 K^-, B_s^0 \pi ^-) $$ X d s u ¯ b ¯ ( ′ ) → ( B 0 K - , B s 0 π - ) , and $$X^{(\prime )}_{s u \bar{d}\bar{b}}\rightarrow B_s^0\pi ^+ $$ X s u d ¯ b ¯ ( ′ ) → B s 0 π + .

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Heavy flavour physics and CP violation at LHCb: A ten-year review

Chen

Qian

et al. 2023

Front. Phys.

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Doubly charmed tetraquarks in a diquark–antidiquark model

Cited by 31 publications

References 117 publications

Further signatures to support the tetraquark mixing framework for the two light-meson nonets

Further signatures to support the tetraquark mixing framework for the two light-meson nonets

Open-charm tetraquark $$X_c$$ and open-bottom tetraquark $$X_b$$

Heavy flavour physics and CP violation at LHCb: A ten-year review

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