Hadronic form factors and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:mrow></mml:math>secondary production cross section: An update

Carvalho, F.; Durães, F. O.; Navarra, F. S.; Nielsen, M.

doi:10.1103/physrevc.72.024902

Cited by 44 publications

(33 citation statements)

References 47 publications

(63 reference statements)

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“…The off-shell behavior of this vertex might differ from that of the D * Dπ one. This coupling was studied using QCDSR in [50] where, translating the definition used therein to the one used here, it was found an on-shell value g = 0.56 ± 0.07 in good agreement with the HQSS expectations. The off-shell behavior was described by a Gaussian, as in the case of the D * Dπ vertex, but with a significantly larger cutoff, π = 1.85 GeV.…”

Section: Charm Decays: Further Analysis Of Uncertaintiesmentioning

confidence: 70%

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Decay widths of the spin-2 partners of the X(3872)

et al. 2015

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We consider the X (3872) resonance as a J PC = 1 ++ DD * hadronic molecule. According to heavy quark spin symmetry, there will exist a partner with quantum numbers 2 ++ , X 2 , which would be a D * D * loosely bound state. The X 2 is expected to decay dominantly into DD, DD * andD D * in d-wave. In this work, we calculate the decay widths of the X 2 resonance into the above channels, as well as those of its bottom partner, X b2 , the mass of which comes from assuming heavy flavor symmetry for the contact terms. We find partial widths of the X 2 and X b2 of the order of a few MeV. Finally, we also study the radiative X 2 → DD * γ and X b2 →B B * γ decays. These decay modes are more sensitive to the longdistance structure of the resonances and to the DD * or BB * final state interaction.

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Section: Charm Decays: Further Analysis Of Uncertaintiesmentioning

confidence: 70%

“…To that end we used the results from the QCD sum rule (QCDSR) calculations performed in Refs. [49,50]. The first of these two works considers the D * Dπ vertex: it was found the form factor is harder if the off-shell meson is heavy, implying that the size of the vertex depends on the exchanged meson.…”

Section: Charm Decays: Further Analysis Of Uncertaintiesmentioning

confidence: 99%

Decay widths of the spin-2 partners of the X(3872)

et al. 2015

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“…However, since in Eq. (27) only the p ′ µ structure appears we choose to work with the p ′ structure. In order to reduce the influence of higher resonances and the pole-continuum transition constributions we perform a double Borel transform in both variables…”

Section: A Sum Rules For the Form Factorsmentioning

confidence: 99%

Bs0meson and theBs0BKcoupling from QCD sum rules

Bracco

Nielsen

2010

Phys. Rev. D

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We evaluate the mass of the Bs0 scalar meson and the coupling constant in the Bs0BK vertex in the framework of QCD sum rules. We consider the Bs0 as a tetraquark state to evaluate its mass. We get mB s0 = (5.85 ± 0.13) GeV, which is in agreement, considering the uncertainties, with predictions supposing it as a bs state or a BK bound state with J P = 0 + . To evaluate the gB s0 BK coupling we use the three point correlation functions of the vertex, considering Bs0 as a normal bs state. The obtained coupling constant is: gB s0 BK = (16.3 ± 3.2) GeV. This number is in agreement with light-cone QCD sum rules calculation. We have also compared the decay width of the Bs0 → BK process considering the Bs0 to be a bs state and a BK molecular state. The width obtained for the BK molecular state is twice as big as the width obtained for the bs state. Therefore, we conclude that with the knowledge of the mass and the decay width of the Bs0 meson, one can discriminate between the different theoretical proposals for its structure.

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“…In a recent work, [2] a QCDSR study of these light scalar mesons was carried out, in which they were treated as qqqq states. In that work the decay constants of these mesons were found and the result was consistent with the existing experimental data.The discovery of the D Because of the discrepancies between theoretical models and the experimental data, we propose that D Our group worked with QCDSR several times before [19][20][21][22][23][24] and there are many others references about this subject. The QCDSR formalism is based on writing the 2-point correlation function…”

mentioning

confidence: 99%

“…Our group worked with QCDSR several times before [19][20][21][22][23][24] and there are many others references about this subject. The QCDSR formalism is based on writing the 2-point correlation function…”

mentioning

confidence: 99%

Charmed scalar mesons masses within the QCD sum rules framework

Lozéa¹,

Bracco²,

Matheus³

et al. 2007

Braz. J. Phys.

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In this work, we evaluate the D + sJ (2317), D 0 0 (2308), D 0 0 (2407) and D + 0 (2403) masses. These are scalar mesons recently discovered in the BABAR, BELLE and FOCUS Collaborations. The nature of these particles is intensely discussed nowadays. We treat them as a diquark-antidiquark configuration and treat the problem using the QCD sum rules (QCDSR) approach.Keywords: Charmed scalar mesons; QCD Sum RulesThe detailed study of charmed scalar meson spectroscopy has provided many informations about the properties of qc systems. However, our knowledge is still not enough to understand all the meson states known nowadays.In 1977, R. L. Jaffe proposed a diquark (qq) antidiquark (qq) bound state structure and he explained the light scalar meson spectroscopy with J P = 0 + quantum numbers [1] using the MIT bag model. Surprisingly, Jaffe has shown that this description (qqqq) was able to accomodate the experimental masses of these mesons. In a recent work, [2] a QCDSR study of these light scalar mesons was carried out, in which they were treated as qqqq states. In that work the decay constants of these mesons were found and the result was consistent with the existing experimental data.The discovery of the D Because of the discrepancies between theoretical models and the experimental data, we propose that D Our group worked with QCDSR several times before [19][20][21][22][23][24] and there are many others references about this subject. The QCDSR formalism is based on writing the 2-point correlation functionand perform an operator product expansion (OPE). The operators are quark and gluon condensates that appear in this expansion due to the non-trivial nature of the QCD vacuum. We can write the correlation function as a dispersion relation. In the OPE side, this correlation function is given by:where the spectral density ρ OPE (s) contains both perturbative and non-perturbative contribuitions to the QCDSR.In the phenomenological side, the spectral density (a pole state plus resonances) is given by the imaginary part of the correlation function:where N depends on the decay constant f Γ and on the mass m Γ . Thus, we have the phenomenological side of QCDSR given by:We can identify (2) and (4) and apply on both sides a Borel transformation defined as:where the ratio Q 2 /n = M 2 is kept finite when Q 2 , n → ∞. The parameter M is called Borel mass. Applying this transformation to the correlation functions above we have:

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Hadronic form factors and theJ/ψsecondary production cross section: An update

Cited by 44 publications

References 47 publications

Decay widths of the spin-2 partners of the X(3872)

Decay widths of the spin-2 partners of the X(3872)

Bs0meson and theBs0BKcoupling from QCD sum rules

Charmed scalar mesons masses within the QCD sum rules framework

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