Weak decays of the axial-vector tetraquark 
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Agaev, S. S.; Azizi, K.; Barsbay, B.; Sundu, H.

doi:10.1103/physrevd.99.033002

Cited by 48 publications

(42 citation statements)

References 53 publications

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“…In our calculation, the total semileptonic decay width with a final J P = 0 + T bc isoscalar tetraquark turns out to be 7.5 × 10 −15 GeV, in clear disagreement with the result of Ref. [17] obtained using a QCD three-point sum rule approach.…”

Section: Tetraquark Mass and Wave Functioncontrasting

confidence: 99%

Spectroscopy, lifetime and decay modes of the Tbb− tetraquark

et al. 2020

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We present the first full-fledged study of the flavor-exotic isoscalar T − bb ≡ bbūd tetraquark with spin and parity J P = 1 + . We report accurate solutions of the four-body problem in a quark model, characterizing the structure of the state as a function of the ratio MQ/mq of the heavy to light quark masses. For such a standard constituent model, T − bb lies approximately 150 MeV below the strong decay threshold B −B * 0 and 105 MeV below the electromagnetic decay threshold B −B0 γ. We evaluate the lifetime of T − bb , identifying the promising decay modes where the tetraquark might be looked for in future experiments. Its total decay width is Γ ≈ 87 × 10 −15 GeV and therefore its lifetime τ ≈ 7.6 ps. The promising final states are B * − D * + ℓ −ν ℓ andB * 0 D * 0 ℓ −ν ℓ among the semileptonic decays, and among the nonleptonic ones. The semileptonic decay to the isoscalar J P = 0 + tetraquark T 0 bc is also relevant but it is not found to be dominant. There is a broad consensus about the existence of this tetraquark, and its detection will validate our understanding of the low-energy realizations of Quantum Chromodynamics (QCD) in the multiquark sector. * gajatee@usal.es † javier.vijande@uv.es ‡ valcarce@usal.es § j-m.richard@ipnl.in2p3.fr Hadronic physics has been much stimulated during the last two decades by the experimental discovery of several new resonances in the hidden-charm sector, resonances that are hardly accommodated in the traditional quark-antiquark or three-quark picture [1]. These are the so-called XY Z mesons and LHCb pentaquarks, which belong to the class of "exotic hadrons", although they are not flavor exotics. After several years of studies, no definite conclusion has been drawn as to whether such non-flavor exotic states correspond to multiquark structures or to hadron-hadron molecules. A similar situation was encountered in the light scalar meson sector, where a multiquark picture was first introduced [2] as an attempt to explain the inverted mass spectrum (inverted in comparison to the simple quarkantiquark structure favored by the naive quark model) exhibited by the low-lying scalar mesons, some of which were later on suggested to be meson-meson molecules [3].For years, the sector of flavor-exotic hadrons has been somewhat forgotten, as being less easily accessible than the hidden-flavor sector. However, already some decades ago, investigations on flavor-exotic multiquarks concluded that QQqq four-quark configurations become more and more deeply bound when the mass ratio M Q /m q increases [4]. There is nowadays a broad theoretical consensus about the existence of such unconventional tetraquark configurations for which all strong decays are energetically forbidden. The most promising candidate is an isoscalar tetraquark with double beauty and J P = 1 + quantum numbers, which is stable against strong and electromagnetic decays. The same conclusion about the stability of this state has been reached in a wide variety of theoretical approaches [4][5][6][7][8][9][10][11][12][13][14]. A nov...

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Section: Tetraquark Mass and Wave Functioncontrasting

confidence: 99%

Spectroscopy, lifetime and decay modes of the Tbb− tetraquark

et al. 2020

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“…Contribution of the higher resonances and continuum states, as usual, are shown by dots. We continue by utilizing the matrix elements (35) and the vertex…”

Section: Decay Z C → D 0 D −mentioning

confidence: 99%

“…It is known, that strong and semileptonic decays of various tetraquark candidates provide valuable information on their internal structure and dynamical features. In the framework of the QCD sum rule approach relevant problems were subject of rather intensive studies [24][25][26][27][28][29][30][31][32][33][34][35][36][37]. The dominant strong decay of the resonance Z c seems is the channel Z c → η c (1S)π − .…”

Section: Introductionmentioning

confidence: 99%

New charged resonance $$Z_{c}^{-}(4100)$$ Z c - ( 4100 ) : the spectroscopic parameters and width

2019

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The mass, coupling and width of the newly observed charged resonance Z − c (4100) are calculated by treating it as a scalar four-quark system with a diquarkantidiquark structure. The mass and coupling of the state Z − c (4100) are calculated using the QCD two-point sum rules. In these calculations we take into account contributions of the quark, gluon and mixed condensates up to dimension ten. The spectroscopic parameters of Z − c (4100) obtained by this way are employed to study its S-wave decays to η c (1S)π − , η c (2S)π − , D 0 D − , and J/ψρ − final states. To this end, we evaluate the strong coupling constants corresponding to the vertices Z c η c (1S)π − , Z c η c (2S)π − , Z c D 0 D − , and Z c J/ψρ − respectively. The couplings g Z c η c1 π , g Z c η c2 π , and g Z c D D are computed by means of the QCD three-point sum rule method, whereas g Z c J/ψρ is obtained from the QCD light-cone sum rule approach and soft-meson approximation. Our results for the mass m = (4080 ± 150) MeV and total width = (147 ± 19) MeV of the resonance Z − c (4100) are in excellent agreement with the existing LHCb data.

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“…[16] In Ref. [17] we calculated the spectroscopic parameters of the axial-vector tetraquark T − bb;ud and analyzed also its semileptonic decay to the scalar state Z 0 bc;ud . Our result for its mass m = (10035 ± 260) MeV confirms once more that it is stable against the strong and electromagnetic decays.…”

Section: Introductionmentioning

confidence: 99%

“…Details of performed analysis and references to earlier and recent articles devoted to different aspects of the doubly and fully heavy tetraquarks can be found in Ref. [17].…”

Section: Introductionmentioning

confidence: 99%

Semileptonic decays of the scalar tetraquark $$Z_{bc;\overline{u}\overline{d}}^{0}$$

2019

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We study semileptonic decays of the scalar tetraquark $$Z_{bc;\overline{u} \overline{d}}^{0}$$Zbc;u¯d¯0 to final states $$T_{bs;\overline{u}\overline{d} }^{-}e^{+}\nu _{e}$$Tbs;u¯d¯-e+νe and $$T_{bs;\overline{u}\overline{d}}^{-}\mu ^{+}\nu _{\mu }$$Tbs;u¯d¯-μ+νμ , which run through the weak transitions $$c\rightarrow se^{+}\nu _{e}$$c→se+νe and $$c\rightarrow s\mu ^{+}\nu _{\mu }$$c→sμ+νμ, respectively. To this end, we calculate the mass and coupling of the final-state scalar tetraquark $$T_{bs;\overline{u}\overline{d} }^{-} $$Tbs;u¯d¯- by means of the QCD two-point sum rule method: these spectroscopic parameters are used in our following investigations. In calculations we take into account the vacuum expectation values of the quark, gluon, and mixed operators up to dimension ten. We use also three-point sum rules to evaluate the weak form factors $$G_{i}(q^2)$$Gi(q2) ($$i=1,~2$$i=1,2) that describe these decays. The sum rule predictions for $$G_{i}(q^2)$$Gi(q2) are employed to construct fit functions $$F_{i}(q^2)$$Fi(q2), which allow us to extrapolate the form factors to the whole region of kinematically accessible $$q^2$$q2. These functions are required to get partial widths of the semileptonic decays $$\Gamma \left( Z_{bc}^{0}\rightarrow Te^{+}\nu _{e}\right) $$ΓZbc0→Te+νe and $$\Gamma \left( Z_{bc}^{0}\rightarrow T\mu ^{+}\nu _{\mu }\right) $$ΓZbc0→Tμ+νμ by integrating corresponding differential rates. We analyze also the two-body nonleptonic decays $$Z_{bc;\overline{u}\overline{d}}^{0} \rightarrow T_{bs;\overline{u}\overline{d }}^{-}\pi ^{+}$$Zbc;u¯d¯0→Tbs;u¯d¯-π+ and $$Z_{bc;\overline{u}\overline{d}}^{0} \rightarrow T_{bs;\overline{u }\overline{d}}^{-}K^{+}$$Zbc;u¯d¯0→Tbs;u¯d¯-K+, which are necessary to evaluate the full width of the $$Z_{bc;\overline{u}\overline{d}}^{0}$$Zbc;u¯d¯0. The obtained results for $$\Gamma _{\mathrm {full}}=(3.18\pm 0.39)\times 10^{-11}~{\mathrm {MeV}}$$Γfull=(3.18±0.39)×10-11MeV and mean lifetime $$20.7_{-2.3}^{+2.9}~{\mathrm {ps}}$$20.7-2.3+2.9ps of the tetraquark $$Z_{bc;\overline{u} \overline{d}}^{0}$$Zbc;u¯d¯0 can be used in experimental investigations of this exotic state.

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Weak decays of the axial-vector tetraquark Tbb;u¯d¯

Cited by 48 publications

References 53 publications

Spectroscopy, lifetime and decay modes of the Tbb− tetraquark

Spectroscopy, lifetime and decay modes of the Tbb− tetraquark

New charged resonance $$Z_{c}^{-}(4100)$$ Z c - ( 4100 ) : the spectroscopic parameters and width

Semileptonic decays of the scalar tetraquark $$Z_{bc;\overline{u}\overline{d}}^{0}$$

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