Vicent Mateu

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We perform an analysis of the form factors that rule the structure-dependent amplitude in the radiative pion decay. The resonance contributions to π → e νeγ decays are computed through the proper construction of the vector and axial-vector form factors by setting the QCD driven asymptotic properties of the three-point Green functions 〈V V P 〉 and 〈V AP 〉,(More)
The most precise top quark mass measurements use kinematic reconstruction methods, determining the top mass parameter of a Monte Carlo event generator m_{t}^{MC}. Because of hadronization and parton-shower dynamics, relating m_{t}^{MC} to a field theory mass is difficult. We present a calibration procedure to determine this relation using hadron level QCD(More)
We construct the most general chirally invariant Lagrangian for mesons in the presence of external sources coupled to the tensor current ψ̄ σμνψ. In order to have only even terms in the chiral expansion, we consider the new source of O(p). With this choice, we build the even-parity effective Lagrangian up to the p-order (NLO). While there are only 4 new(More)
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. We introduce an operator depending on the ''transverse velocity'' r that(More)
Citation Abbate, Riccardo et al. " Precision thrust cumulant moments at N[superscript 3]LL. " Physical Review D 86.9 (2012). Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share(More)
André H. Hoang, Daniel W. Kolodrubetz, Vicent Mateu, and Iain W. Stewart University of Vienna, Faculty of Physics, Boltzmanngasse 5, A-1090 Wien, Austria Erwin Schrödinger International Institute for Mathematical Physics, University of Vienna, Boltzmanngasse 9, A-1090 Vienna, Austria Center for Theoretical Physics, Massachusetts Institute of Technology,(More)
Precise Determination of [subscript s] from the C-Parameter Distribution. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. We(More)
Axiomatic principles such as analyticity, unitarity, and crossing symmetry constrain the second derivative of the π π scattering amplitudes in some channels to be positive in a region of the Mandelstam plane. Since this region lies in the domain of validity of chiral perturbation theory, we can use these positivity conditions to bound linear combinations of(More)
We analyze the numerical determination of the quark mixing factor Vus from hyperon semileptonic decays. The discrepancies between the results obtained in two previous studies are clarified. Our fits indicate sizeable SU(3) breaking corrections, which unfortunately can only be fully determined from the data at the first order. The lack of a reliable(More)