Coupling constants of D*DsK and Ds*DK processes

Bracco, Mirian E.; Lozéa, A.; Cerqueira, A. S.; Chiapparini, M.; Nielsen, M.

doi:10.1590/s0103-97332007000100019

Cited by 16 publications

(18 citation statements)

References 15 publications

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“…To reduce the uncertainties in evaluation of the strong couplings at the vertices and smooth problems with extrapolation of the form factors to the mass-shell, it is possible to fix the pion on the massshell and treat one of the remaining heavy states (Z c or η c ) as the off-shell particle. This trick was used numerously to study the conventional heavy-heavy-light mesons' couplings [52,53]. Form factors obtained by treating a light or one of heavy mesons off-shell may differ from each other considerably, but after extrapolating to the corresponding mass-shells lead to the same or slightly different strong couplings.…”

Section: Decays Z C → η C (1s)π − and Z C → η C (2s)π −mentioning

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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Section: Decays Z C → η C (1s)π − and Z C → η C (2s)π −mentioning

confidence: 99%

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

2019

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“…To reduce the uncertainties in evaluation of the strong couplings at the vertices and smooth problems with extrapolation of the form factors to the mass-shell, it is possible to fix the pion on the mass-shell and treat one of the remaining heavy states (Z c or η c ) as the off-shell particle. This trick was used numerously to study the conventional heavy-heavy-light mesons' couplings [52,53]. Form factors obtained by treating a light or one of heavy mesons off-shell may differ from each other considerably, but after extrapolating to the corresponding mass-shells lead to the same or slightly different strong couplings.…”

Section: Mass and Coupling Of The Scalar Tetraquark Zcmentioning

confidence: 99%

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

Sundu,

Agaev,

Azizi

2018

Preprint

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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 diquark-antidiquark 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 Swave decays to ηc(1S)π − , ηc(2S)π − , D 0 D − , and J/ψρ − final states. To this end, we evaluate the strong coupling constants corresponding to the vertices Zcηc(1S)π − , Zcηc(2S)π − , ZcD 0 D − , and ZcJ/ψρ − respectively. The couplings gZ cηc1 π , gZ cηc2π , and gZ cDD are computed by means of the QCD three-point sum rule method, whereas g ZcJ/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 Γ = (147 ± 19) MeV of the resonance Z − c (4100) are in excellent agreement with the existing LHCb data. I. INTRODUCTIONRecently, the LHCb Collaboration reported on evidence for andecays extracted from analysis of pp collisions' data collected with LHCb detector at center-of-mass energies of √ s = 7, 8 and 13 TeV [1]. The mass and width of this new Z − c (4100) resonance (hereafter Z c ) were found equal to m = 4096 ± 20 +18 −22 MeV and Γ = 152 ± 58 +60 −35 MeV, respectively. As it was emphasized in Ref.[1], the spinparity assignments J P = 0 + and J P = 1 − both are consistent with the data.From analysis of the decay channel Z c → η c (1S)π − it becomes evident that Z c contains four quarks cdcu, and it is presumably another member of the family of charged exotic Z-resonances with the same quark content; the well-known axial-vector tetraquarks Z ± c (4430) and Z ± c (3900) are also built of the quarks cdcu or cucd. The Z ± c (4430) were discovered and studied by the Belle Collaboration in B meson decays B → Kψ ′ π ± as resonances in the ψ ′ π ± invariant mass distributions [2][3][4]. The decay of Z + c (4430) to the final state J/ψπ + also was detected in the Belle experiment [5]. The existence of the Z ± c (4430) resonances was confirmed by the LHCb Collaboration as well [6,7].Another well-known members of this family are the axial-vector states Z ± c (3900), which were detected by the BESIII Collaboration in the process e + e − → J/ψπ + π − as peaks in the J/ψπ ± invariant mass distributions [8]. These structures were seen by the Belle and CLEO collaborations as well (see Refs. [9,10]). The BESIII informed also on observation of the neutral Z 0 c (3900) state in the process e + e − → π 0 Z 0 c → π 0 π 0 J/ψ [11]. Various theoretical models and approaches were employed to reveal the internal quark-gluon structure and determine parameters of the charged Z-resonances. Thus, they were considered as hadrocharmonium com-pounds or tightly bound diquark-antidiquark states, were treated as the four-quark systems built of conventional mesons or inte...

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“…Putting the expressions given in Eqs. ( 10), (11), and ( 12) into ( 9), taking the double Borel transform over the variables −p 2 and −(p + q) 2 , and using the results of Appendix B to carry out the integrals encountered, we obtain the required sum rules for the strong coupling constants, g V and g A , where the subscripts V and A stand for the case of vector and axial vector charmed or bottom mesons:…”

Section: Light-cone Sum Rules For Charmed/bottom Meson-light Vector M...mentioning

confidence: 99%

“…So far, to the best of our knowledge, many heavy-light meson vertices such as D * s D * K, D s1 D 1 K * [2], D * D * ρ [3], D * Dπ, B * Bπ [4,5], DDρ [6], D * Dρ [7], DDJ/ψ [8], D * DJ/ψ [9], D * D * π [10], D s D * K, D * s DK [11], DDω [12], D s1 D * K, D s1 D * K * 0 [13,14], [37], and D * D * ρ [38] with the lightcone QCD sum rules (LCSR) approach, DDρ, D * D * ρ [39] in holographic QCD (HQCD), [41][42][43][44] in lattice QCD, DDρ [45] in the non-relativistic quark model, DDρ, DDσ, [46] based on the approach of correlated 2π exchange with the pole approximation (PA), B * B * ρ [47,48] and D * D * ρ [49] in the mesonexhange model (MEM), B * B * ρ, D * Dπ, B * Bπ [50,51] in the potential model, and, lastly, [52] in the one-boson exchange (OBE) model.…”

Section: Introductionmentioning

confidence: 99%

“…bative effects. So far, to the best of our knowledge, many heavy-light meson vertices such as D * s D * K, D s1 D 1 K * [2], D * D * ρ [3], D * Dπ, B * Bπ [4, 5], DDρ [6], D * Dρ [7], DDJ/ψ [8], D * DJ/ψ [9], D * D * π [10], D s D * K, D *s DK[11], DDω[12],D s1 D * K, D s1 D * K * 0 [13, 14], D s D s V , D * s D * s V , D * s0 D s1 V , D s D * s V [15, 16], D 1 D * π, D 1 D 0 π, D 1 D 1 π, B 1 B * π, B 1 B 0 π, B 1 B 1 π [17], D * D * J/ψ [18], B s0 BK [19], B * s BK [20], D * s D s φ [21], D s DK * 0 , B s BK * 0 , D * s DK, B * s BK, D * s DK 1 , B * s BK 1 [22], D * Dπ, D * D * π, DDρ, D * Dρ, D * D * ρ, DDJ/ψ, D * DJ/ψ, D * D * J/ψ [23], D s DK * , D s D * K * [24], D * s DK * , B * s BK * [25], D 0 D * s0 K * , D 1 D * s0 K * [26], B s B * K, B s BK * [27], B * B * ρ [28], B s1 B * K, B s1 B * K * 0 [29], B * s1 B * K [30], D s D s J/ψ, D s D s φ [31], D * D * s K, D 1 D s1 K, D * D s K, D 1 D * s0 K [32], and B s0 B 1 K, B s1 B 1 K [33]are estimated in the framework of the three-point QCD sum rules (3PSR), D * D s K, D * s DK, D s0 DK, D 0 D s K [34], D * D * P , D * DV , DDV [35], D * Dρ, B * Bρ [36], D * Dπ, B * Bπ [37], and D * D * ρ [38] with the lightcone QCD sum rules (LCSR) approach, DDρ, D * D * ρ [39] in holographic QCD (HQCD), DDρ, D * Dρ, D * D * ρ [40] using the Dyson-Schwinger equation (DSE) in QCD, D * Dπ, DDρ, D * D * ρ [41-44] in lattice QCD, DDρ [45] in the non-relativistic quark model, DDρ, DDσ, D * D * ρ, D * D * σ, BBρ, BBσ, B * B * ρ, B * B * σ [46] based on the approach of correlated 2π exchange with the pole approximation (PA), B * B * ρ [47, 48] and D * D * ρ [49] in the mesonexhange model (MEM), B * B * ρ, D * Dπ, B * Bπ [50, 51] in the potential model, and, lastly, D * D * ρ, B * B * ρ [52] in the one-boson exchange (OBE) model.In the present work, we study the coupling constants of D…”

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confidence: 99%

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Strong coupling constant of negative parity octet baryons with light pseudoscalar mesons in light cone QCD sum rules

Aliev

Savcı

2017

Nuclear Physics A

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The strong coupling constants of the π and K mesons with negative parity octet baryons are estimated within the light cone QCD sum rules. It is observed that all strong coupling constants, similar to the case for the positive parity baryons, can be described in terms of three invariant functions, where two of them correspond to the well known F and D couplings in the SU (3) f symmetry, and the third function describes the SU (3) f symmetry violating effects. We compare our predictions on the strong coupling constants of pseudoscalar mesons of negative parity baryons with those corresponding to the strong coupling constants for the positive parity baryons.

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Coupling constants of DDsK and DsDK processes

Cited by 16 publications

References 15 publications

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

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

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

Strong coupling constant of negative parity octet baryons with light pseudoscalar mesons in light cone QCD sum rules

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