Ref Arxiv: 1410.0137
Ref INSPIRE: 1319649
DOI: 10.1016/j.nuclphysbps.2015.01.034
Ref. & Cit.: NASA ADS
4 citations
Comments: 4 pages, 12 figures, Talk given at the 17th International Conference on Quantum Chromodynamics (QCD 14) (29 june - 3 july 2014, Montpellier-France), to appear in Nucl. Phys. B (Proc. Suppl.)

Ref HAL: hal-00931998_v1
Ref Arxiv: 1401.3689
Ref INSPIRE: 1277245
DOI: 10.1016/j.physletb.2014.09.056
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
17 citations
Comments: 12 pages, 19 figures, 2 tables

Ref HAL: hal-00932027_v1
Ref Arxiv: 1212.5544
DOI: 10.1016/j.physletb.2013.03.026
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
16 citations
Comments: 8 pages, 9 figures, 5 tables. Extended and Revised version which matches with the published one in PLB

Ref HAL: hal-00932020_v1
Ref Arxiv: 1302.6909
DOI: 10.1016/j.physletb.2013.04.008
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
10 citations
Comments: 8 pages, no figure, no table. Extended version including the effects of a negative dilaton, additional references

Ref Arxiv: 1209.2023
Ref. & Cit.: NASA ADS
Abstract:

Using recent values of the QCD (non-) perturbative parameters given in Table 1 and an estimate of the N3LO QCD perturbative contributions based on the geometric growth of the PT series, we re-use QCD spectral sum rules (QSSR) known to N2LO PT series and including all dimension-six NP condensate contributions in the full QCD theory, for improving the existing estimates of {m}_{c,b} and f_{D_(s)}, f_{B_(s)} from the open charm and beauty systems. We especially study the effects of the subtraction point on "different QSSR data" and use (for the first time) the Renormalization Group Invariant (RGI) scale independent quark masses in the analysis. The estimates [rigourous model-independent upper bounds] reported in Table 8: f_D/f_\pi=1.56(5)[< 1.68(1)], f_B/f_\pi=1.58(5)[< 1.80(3)] and f_{D_s}/f_K= 1.58(4) [< 1.63(1)], f_{B_s}/f_K=1.50(3)[< 1.61(3.5)], which improve previous QSSR estimates, are in perfect agreement (in values and precisions) with some of the experimental data on f_{D,D_s} and on recent lattice simulations within dynamical quarks. These remarkable agreements confirm both the success of the QSSR semi-approximate approach based on the OPE in terms of the quark and gluon condensates and of the Minimal Duality Ansatz (MDA) for parametrizing the hadronic spectral function which we have tested from the complete data of the J/\psi and \Upsilon systems. The values of the running quark masses m_c(m_c)=1286(66) MeV and m_b(m_b)= 4236(69) MeV from M_{D,B} are in good agreement though less accurate than the ones from recent J/\psi and \Upsilon sum rules.

Comments: 13 pages, 20 figures, 8 tables: partly presented at the 16th QCD international conference (QCD 12), Montpellier, 2-6th july 2012

Ref Arxiv: 1204.1236
Ref. & Cit.: NASA ADS
Abstract:

We estimate the masses of the 1-- and 0++ heavy four-quark and molecule states by combining exponential Laplace (LSR) and finite energy (FESR) sum rules known perturbatively to lowest order (LO) in \alpha_s but including non-perturbative terms up to the complete dimension-six condensate contributions. This approach allows to fix unambiguously and more precisely the value of the QCD continuum threshold (often taken ad hoc) at which the optimal result is extracted. We use double ratio of sum rules (DRSR) for determining the SU(3) breakings terms. We also study the effects of the heavy quark mass definitions on these LO results. The SU(3) mass-splittings of about (70 -- 110) MeV and the ones of about (250-300) MeV between the lowest ground states and their 1st radial excitations are (almost) heavy-flavour independent. The mass predictions summarized in Table 4 are compared with the ones in the literature (when available) and with the three Y_c(4260, 4360, 4660) and \Y_b(10890) 1-- experimental candidates. We conclude (to this order approximation) that the lowest observed state cannot be a pure four-quark nor a pure molecule but may result from their mixings. Our predictions can be further tested at LHC_b and in some other hadron factories.

Comments: 11 pages, 11 figures, 4 tables

Ref HAL: in2p3-00686368_v1
Ref Arxiv: 1204.1448
DOI: 10.1103/PhysRevD.85.114007
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
7 citations
Comments: 14 pages, 7 figures, 3 tables