[PDF] Top 20 Understanding the X(3872) with QCD sum rules
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Understanding the X(3872) with QCD sum rules
... The sum rules approach is based on the principle of duality. It consists in the assumption that the correlation function may be described at both quark and hadron lev- els. At the hadronic level (the ... See full document
8
X, Y, Z search at Belle II
... the X(3872) line shape are some examples where the contribution of the Belle II experiment will help in better understanding QCD, for which several open issues still remain ... See full document
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Evidence for the decay X(3872) > J/ψω
... the X meson) has been observed primarily in its J= c þ decay mode ...decay X ! D 0 D 0 0 has also been observed [12] and in- terpreted as evidence for X ! D 0 D 0 ; this has been con- firmed by ... See full document
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Recent results from BABAR
... the X(3872) allows the different inter- pretations to be distinguished and can greatly aid in understanding the nature of the ...The X(3872) has a narrow width, less than ... See full document
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Understanding X(3862), X(3872), and X(3930) spectrum in a Friedrichs-model-like scheme
... The η ± function can be analytically continued to the complex plane to be one complex function η(z) for z ∈ C with its boundary η(x ± iϵ) = η ± (x) for x ∈ R. Since there is only one threshold for ... See full document
11
X(3872) in Heavy Quark Limit of QCD: Its Partners and Isospin Structure
... where the sum is over all mesons that can be created from the vacuum by j † . As is seen from eq. 4, the masses of the mesons correspond to poles in the correlation function. Hence, to show that two mesons are ... See full document
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Spin-1 charmonium-like states in QCD sum rule
... so-called X, Y, Z states are not understood well ...on. X(3872) is the best studied charmonium-like state since its discovery by the Belle Collaboration ... See full document
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Determination of the X(3872) meson quantum numbers
... Xð 3872 Þ state are 1 þþ ...Xð 3872 ÞK þ , Xð 3872 Þ ! þ J= c , J= c ! þ decays using a likelihood-ratio ...result rules out the explanation of the Xð3872Þ meson as a conventional c2 ð1 1 D 2 ... See full document
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Mass splitting of heavy-baryons from QCD sum rules
... in a much better agreement with the predicitions in Table 3. The predicition in ref. [14] was done in a QCD sum rule (QCDSR) calculation [16]. Earlier uses of QCDSR [17– 19] for understanding charm ... See full document
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Towards a Theoretical Understanding of the XYZ Mesons from QCD
... The Born-Oppenheimer approach implies that quarkonium hybrids and quarkonium tetraquarks definitely exist as states in the QCD spectrum. Whether they can be observed in experiments depends on how narrow they are, ... See full document
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On properties of the exotic hadrons from QCD sum rules
... class of decay constants vanishes, one is eligible to say that the exotic state is, e.g., a pure molecular or a pure diquark–antidiquark state. In general, the mixing of different “components” seems unavoidable. An ... See full document
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Heavy-Meson Decay Constants: QCD Sum-Rule Glance at Isospin Breaking
... QCD sum rules [1] are analytic relations between hadron features and QCD parameters emerging upon evaluation of correlation functions of appropriate interpolating operators at both the ... See full document
5
Dynamical picture for the exotic XYZ states
... We employed the diquark-antidiquark interpretation suggested in Ref. [14] and performed an independent analysis of the properties of the X(3872) within our covariant confined quark model in the papers Refs. ... See full document
7
Understanding Tracing Rules
... upon rules of tracing in the very case which recognised the law of unjust enrichment: Lipkin Gorman v Karpnale ...The rules of tracing would therefore seem to have been important to establish a ... See full document
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Sum rules and the Szego condition for Jacobi matrices
... Hence, we are left with the question whether Z(J ) < ∞. There is extensive literature on when this is the case. See, for example, [1, 2, 8, 11, 17, 18, 20, 21, 22, 28, 33, 34]. We are interested in this question for ... See full document
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New Unitary Relations between the QCD sum rules
... QCD sum rules (QCD SR’s) introduced by [1, 2] have become one of the most important tools while studying baryon or meson couplings and the corresponding form factors with photons, mesons or ... See full document
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X(3872) and its charmonium content in Heavy Quark limit
... where B > 0 is the binding energy, i.e. in the molecular picture X (3872) is a weakly bound D D ¯ ∗ state. Another puzzling observation about X (3872) is its decays into final states ... See full document
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Observation of X(3872) production in pp collisions at √s=7TeV
... (2S), X(3872) and background), two masses (ψ (2S) and X(3872)), one resolution parameter, and two background shape ...the X(3872) and ψ (2S) masses are found to be ... See full document
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Heavy Quark Symmetries: Molecular partners of the X(3872) and Zb(10610)/Zb′(10650)
... the QCD spectrum in the charm sector has been increasing in importance as more experimental data at high energies have become ...other X, Y, Z resonances that might be fitted into this scheme have also been ... See full document
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Hadronic structure of the photon at small x in holographic QCD
... solid understanding of the nature of a photon has been one of the most longstanding problems in high energy physics for several ...perturbative QCD approaches are basically applicable because the pointlike ... See full document
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