Search for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:mi>b</mml:mi><mml:mi>b</mml:mi><mml:mover accent="true"><mml:mrow><mml:mi>b</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy="false">¯</mml:mo></mml:mrow></mml:mover><mml:mover accent="true"><mml:mrow><mml:mi>b</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy="false">¯</mml:mo></mml:mrow></mml:mover></mml:math> tetraquark decays in 4 muons, B+B−, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.svg"><mml

Becchi, C.; Giachino, Alessandro; Maiani, L.; Santopinto, E.

doi:10.1016/j.physletb.2020.135495

Cited by 48 publications

(41 citation statements)

References 18 publications

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“…These results should serve as useful benchmarks for other analyses, which are necessary in order to identify model-dependent artefacts and develop a perspective on those predictions which might only be weakly sensitive to model details. Moreover, given that the decay modes of fully-b J = 0 ++ tetraquarks may be difficult to access experimentally [84][85][86], our predictions for orbitallyexcited and J = 0 tetraquarks may serve useful in guiding new experimental searches for fully-heavy four-quark states. Our predictions for the masses of the fully-charm states can be compared to the recent LHCb experimental results [12].…”

Section: Complete Tetraquark Spectramentioning

confidence: 99%

Spectrum of fully-heavy tetraquarks from a diquark+antidiquark perspective

et al. 2020

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Using a relativized diquark model Hamiltonian, we calculate the masses of $$J^{PC}=0^{++}$$ J PC = 0 + + ground-state tetraquarks in the following systems: $$b s {\bar{b}} {\bar{s}}$$ b s b ¯ s ¯ , $$bb {\bar{n}} {\bar{n}}$$ b b n ¯ n ¯ ($$n=u, d$$ n = u , d ), $$bb {\bar{s}} {\bar{s}}$$ b b s ¯ s ¯ , $$cc{\bar{c}} {\bar{c}}$$ c c c ¯ c ¯ , $$b b {\bar{b}} {\bar{b}}$$ b b b ¯ b ¯ , $$b c{\bar{b}} {\bar{c}}$$ b c b ¯ c ¯ and $$b b {\bar{c}} {\bar{c}}$$ b b c ¯ c ¯ . We also compute extensive spectra for the fully-heavy quark flavour combinations. Finally, as a test of the diquark model approach, we compute the masses of fully-heavy baryons in the diquark model. Our results may be compared soon to the forthcoming experimental data for fully-heavy three-quark systems.

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Section: Complete Tetraquark Spectramentioning

confidence: 99%

Spectrum of fully-heavy tetraquarks from a diquark+antidiquark perspective

et al. 2020

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“…Similar conclusions appear in Refs. [20][21][22][23][24][25][26]. We discuss the fate of the 1S states in our model later in this section; the subsequent multiplets in order of increasing mass turn out to be 1P, 2S, 1D, 2P, and 2D, as confirmed below.…”

mentioning

confidence: 93%

“…Theoretical studies of cccc states have a much longer history, dating indeed to a time only two years after the discovery of the J=ψ [2] and followed by a smattering of papers in the 1980s [3][4][5]. The current interest in cccc states, starting in 2011 [6,7] and particularly ramping up since 2016 [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27], emerged from the expectation of dedicated searches at the LHC.…”

Section: Introductionmentioning

confidence: 99%

Simple spectrum of cc¯cc¯ states in the dynamical diquark model

Giron

Lebed

2020

Phys. Rev. D

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We develop the spectroscopy of cccc and other all-heavy tetraquark states in the dynamical diquark model. In the most minimal form of the model (e.g., each diquark appears only in the color-triplet combination; the nonorbital spin couplings connect only quarks within each diquark), the spectroscopy is extremely simple. Namely, the S-wave multiplets contain precisely three degenerate states (0 þþ , 1 þ− , 2 þþ) and the seven P-wave states satisfy an equal-spacing rule when the tensor coupling is negligible. When comparing numerically to the recent LHCb results, we find the best interpretation is assigning Xð6900Þ to the 2S multiplet, while a lower state suggested at about 6740 MeV fits well with the members of the 1P multiplet. We also predict the location of other multiplets (1S, 1D, etc.) and discuss the significance of the cc open-flavor threshold.

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“…In Refs. [15][16][17][18][19][20][21][22][23][24][25][26], the lowest bbbb tetraquark state is estimated to be below the threshold of bottomonium meson pair, while in Refs. [27][28][29][30][31][32][33][34][35], all the bbbb tetraquark states are above the threshold.…”

Section: Introductionmentioning

confidence: 99%

Masses of fully heavy tetraquarks $$QQ {\bar{Q}} {\bar{Q}}$$ in an extended relativized quark model

2020

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Inspired by recent measurement of possible fully charmed tetraquarks in LHCb Collaboration, we investigate the mass spectra of fully heavy tetraquarks $$QQ {\bar{Q}} {\bar{Q}}$$ Q Q Q ¯ Q ¯ in an extended relativized quark model. Our estimations indicate that the broad structure around 6.4 GeV should contain one or more ground states for $$cc {\bar{c}} {\bar{c}}$$ c c c ¯ c ¯ tetraquarks, while the narrow structure near 6.9 GeV can be categorized as the first radial excitation of $$cc {\bar{c}} {\bar{c}}$$ c c c ¯ c ¯ system. Moreover, with the wave functions of the tetraquarks and mesons, the strong decays of tetraquarks into heavy quarkonium pair are qualitatively discussed, which can be further checked by the LHCb and CMS Collaborations.

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Search for bbb¯b¯ tetraquark decays in 4 muons, B+B−,

Cited by 48 publications

References 18 publications

Spectrum of fully-heavy tetraquarks from a diquark+antidiquark perspective

Spectrum of fully-heavy tetraquarks from a diquark+antidiquark perspective

Simple spectrum of cc¯cc¯ states in the dynamical diquark model

Masses of fully heavy tetraquarks $$QQ {\bar{Q}} {\bar{Q}}$$ in an extended relativized quark model

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