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L'agglomération d'activités d'économie sociale: Mondragon, Montréal et la Toscane
Prades, Jacques;
Intera??es (Campo Grande) , 2006, DOI: 10.1590/S1518-70122006000200005
Abstract: the objective of this article is to give an account about results of three agglomeration experiences about the social economy activities in spanish bilbao country, in italy and montreal. the study needee seven travels around the places where the informations were picked about the grounds and the expenses. it has as objective to express an amount of observed resorts after the succinct description about the grounds. in a first side, we will express some methodologic prelinimaries, definitions and hyphotesis. in a second side, we will make a description of the three experiences. for conclusion, we will group the common ingredients of there three experiences to take some analytic consequences.
ChPT Progress on Non-Leptonic and Radiative Kaon Decays
Prades, Joaquim
High Energy Physics - Phenomenology , 2007,
Abstract: I discuss recent developments on non-leptonic and radiative kaon decays mainly related to direct CP-violation within the combined ChPT and 1/N_c expansion approaches. In particular, I review the status of K -> pi pi, epsilon_K', direct CP-violating K+ -> 3 pi Dalitz plot slope g and decay rate asymmetries, and the Standard Model prediction for Br(K_L -> pi0 e+ e-).
ChPT Progress on Non-Leptonic and Radiative Kaon Decays
Joaquim Prades
Physics , 2007,
Abstract: I discuss recent developments on non-leptonic and radiative kaon decays mainly related to direct CP-violation within the combined ChPT and 1/N_c expansion approaches. In particular, I review the status of K -> pi pi, epsilon_K', direct CP-violating K+ -> 3 pi Dalitz plot slope g and decay rate asymmetries, and the Standard Model prediction for Br(K_L -> pi0 e+ e-).
Massive Spin-1 Field Chiral Lagrangian from an Extended Nambu-Jona-Lasinio Model of QCD
Joaquim Prades
Physics , 1993, DOI: 10.1007/BF01580330
Abstract: We present a calculation of the coupling constants in the massive spin-1 field chiral Lagrangian to chiral ${\cal O}(p^3)$ in the context of an extended Nambu--Jona-Lasinio cut-off model. Phenomenological applications of this Lagrangian to anomalous and non-anomalous low-energy hadronic transitions involving spin-1 particles are also discussed.
m_u + m_d from QCD-Hadron Duality
Joaquim Prades
Physics , 1997, DOI: 10.1016/S0920-5632(97)01070-0
Abstract: The value of the light quark masses combination $m_u + m_d$ is analized using QCD-Hadron Duality. A detailed analysis of both the perturbative QCD [to four-loops] and the hadronic parametrization needed is done. The result we get is $[m_u + m_d] (1 GeV^2) = (12.8 \pm 2.5)$ MeV ($[m_u + m_d] (4 GeV^2) = (9.8 \pm 1.9)$ MeV) in the $\barMS$ scheme.
The $ΔI=1/2$ Rule for Kaons
Joaquim Prades
Physics , 1999, DOI: 10.1016/S0920-5632(00)00578-8
Abstract: We report on recent advances at understanding the $\Delta I= 1/2$ rule for kaons. We get reasonable matching between short-- and long--distances for scales between between 0.6 and 1.0 GeV and reproduce the $\Delta I=1/2$ rule huge enhancement in the chiral limit. A detailed analysis of the different contributions to the relevant octet and 27-plet couplings is done. For the $B_6^{(1/2)}(\mu) \equiv < (\pi\pi)_0 | Q_6 | K > / [< (\pi\pi)_0 | Q_6 | K > {\Large|}_{N_c}]$ parameter, we get in the chiral limit $B_6^{(1/2)}(\mu) = 2.2 \pm 0.5$ for scales $\mu \in [0.6, 1.0]$ GeV.
The Standard Model Prediction for Muon g-2
Joaquim Prades
Physics , 2001,
Abstract: The present Standard Model prediction for muon g-2 is reviewed. Emphasis is put in discussing the main hadronic uncertainties at present.
Status of the Hadronic Light-by-Light Contribution to the Muon Anomalous Magnetic Moment
Bijnens, Johan;Prades, Joaquim
High Energy Physics - Phenomenology , 2007,
Abstract: We review the present status of the hadronic light-by-light contribution to muon g-2 and critically compare recent calculations.
Obtaining sigma --> gamma gamma Width from Nucleon Polarizabilities
Prades, Joaquim;Bernabeu, Jose
High Energy Physics - Phenomenology , 2008, DOI: 10.1016/j.nuclphysbps.2008.12.062
Abstract: We propose a new method that fixes the coupling to two photons of the recently found lightest QCD resonance, the sigma. This coupling provides crucial information for discriminating the yet unknown nature of this special state. Our method uses available data on the nucleon polarizabilities together with analyticity and unitarity. Taking into account all the uncertainties, our result is Gamma_{pole}= 1.2 +- 0.4 keV.
The Hadronic Light-by-Light Contribution to the Muon Anomalous Magnetic Moment: Where do we stand?
Bijnens, Johan;Prades, Joaquim
High Energy Physics - Phenomenology , 2007, DOI: 10.1142/S0217732307022992
Abstract: We review the status of the hadronic light-by-light contribution to the muon anomalous magnetic moment and critically compare recent calculations. We also study in detail which momentum regions the pi^0 exchange main contribution originates. We also argue that a_\mu^{light-by-light} = (11 \pm 4) \times 10^{-10} encompasses the present understanding of this contribution and comment on some directions to improve on that.
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