Higher fully-charmed tetraquarks: Radial excitations and P-wave states

Wang, Guang-Juan; Meng, Lu; Oka, Makoto; Zhu, Shi-Lin

doi:10.48550/arxiv.2105.13109

Cited by 3 publications

(5 citation statements)

References 62 publications

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“…See also theoretical studies of Refs. [608,609,610] using various constituent quark models. Besides, the X(6900) was interpreted in Refs.…”

Section: Compact Tetraquark Picturementioning

confidence: 99%

An updated review of the new hadron states

Chen¹,

Chen²,

Liu³

et al. 2022

Preprint

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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 active field. Besides the conventional heavy hadrons, we shall also review the recently observed open heavy flavor tetraquark states X(2900) and T + cc (3875) as well as the hidden heavy flavor multiquark states X(6900), P cs (4459) 0 , Z cs (3985) − , Z cs (4000) + , and Z cs (4220) + . We will also cover the recent progresses on the glueballs and light hybrid mesons, which are the direct manifestations of the non-Abelian SU (3) gauge interaction of the Quantum Chromodynamics in the low-energy region.

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“…See also theoretical studies of Refs. [608,609,610] using various constituent quark models. Besides, the X(6900) was interpreted in Refs.…”

Section: Compact Tetraquark Picturementioning

confidence: 99%

An updated review of the new hadron states

Chen¹,

Chen²,

Liu³

et al. 2022

Preprint

Self Cite

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“…mass, 7.03 +0. 22 −0.26 GeV, for the operator J Dia T,1 with J PC = 2 ++ is also close to that of X(6900), so we can not assert that the quantum number of X(6900) is 0 ++ , while 2 ++ may also be possible. Since the quality of the Borel platform in On-Shell scheme is worse than that in MS one, which can be seen from figures 7-25, we only use the corresponding MS masses in the above analysis.…”

Section: Currentmentioning

confidence: 80%

“…Fully heavy tetraquark QQ QQ system is a good platform for studying QCD and exotic states because the system has a strong symmetry in structure and avoids pollution from light quarks. Since 1975, there have been many theoretical studies of fully heavy tetraquark systems using potential models [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], QCD Sum Rules [23][24][25][26][27][28][29] and other techniques [30][31][32][33]. But it is still under debate whether there exist compact bound states below di-heavyquarkonium threshold, e.g.…”

Section: Jhep11(2022)023 1 Introductionmentioning

confidence: 99%

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NLO results with operator mixing for fully heavy tetraquarks in QCD sum rules

Zuo

Wang

et al. 2022

J. High Energ. Phys.

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We study the mass spectra of $$ \overline{Q}Q\overline{Q}Q $$ Q ¯ Q Q ¯ Q (Q = c, b) systems in QCD sum rules with the complete next-to-leading order (NLO) contribution to the perturbative QCD part of the correlation functions. Instead of meson-meson or diquark-antidiquark currents, we use diagonalized currents under operator renormalization. We find that differing from conventional mesons $$ \overline{q}q $$ q ¯ q and baryons qqq, a unique feature of the multiquark systems like $$ \overline{Q}Q\overline{Q}Q $$ Q ¯ Q Q ¯ Q is the operator mixing or color configuration mixing induced by NLO corrections, which is crucial to understand the color structure of the states. Our numerical results show that the NLO corrections are very important for the $$ \overline{Q}Q\overline{Q}Q $$ Q ¯ Q Q ¯ Q system, because they not only give significant contributions but also reduce the scheme and scale dependence and make Borel platform more distinct, especially for the $$ \overline{b}b\overline{b}b $$ b ¯ b b ¯ b in the $$ \overline{\textrm{MS}} $$ MS ¯ scheme. We use currents that have good perturbation convergence in our phenomenological analysis. With the $$ \overline{\textrm{MS}} $$ MS ¯ scheme, we get three JPC = 0++ states, with masses $$ {6.35}_{-0.17}^{+0.20} $$ 6.35 − 0.17 + 0.20 GeV, $$ {6.56}_{-0.20}^{+0.18} $$ 6.56 − 0.20 + 0.18 GeV and $$ {6.95}_{-0.35}^{+0.21} $$ 6.95 − 0.35 + 0.21 GeV, respectively. The first two seem to agree with the broad structure around 6.2 ~ 6.8 GeV measured by the LHCb collaboration in the J/ψJ/ψ spectrum, and the third seems to agree with the narrow resonance X(6900). For the 2++ states we find one with mass $$ {7.03}_{-0.26}^{+0.22} $$ 7.03 − 0.26 + 0.22 GeV, which is also close to that of X(6900), and another one around $$ {7.25}_{-0.35}^{+0.21} $$ 7.25 − 0.35 + 0.21 GeV, which has good scale dependence but slightly large scheme dependence.

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“…In the framework of a non-relativistic potential quark model (NRPQM) for a heavy quark system, Ref. [3] deemed that the lowest one can be interpreted as an -wave state at…”

Section: J/ψ X(7200)mentioning

confidence: 99%

Some remarks on X(6900) *

Cao

Chen

et al. 2021

Chinese Phys. C

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The analysis of the LHCb data on X(6900) found in the di-J/ψ system is performed using a momentum-dependent Flattè-like parameterization. The use of the pole counting rule and spectral density function sum rule give consistent conclusions that both confining states and molecular states are possible, or it is unable to distinguish the nature of X(6900), if only the di-J/ψ experimental data with current statistics are available. We suggest that experiments measure other channels, such as J/ψψ(3770), J/ψψ2(3823), J/ψψ3(3842), and χc0χc1, to better understand the nature of X(6900), and J/ψψ(4160), χc0χc1(3872), etc., to confirm the X(7200) state.

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Higher fully-charmed tetraquarks: Radial excitations and P-wave states

Cited by 3 publications

References 62 publications

An updated review of the new hadron states

An updated review of the new hadron states

NLO results with operator mixing for fully heavy tetraquarks in QCD sum rules

Some remarks on X(6900) *

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