Insisting on the role of experimental data: the pseudoscalar-pole piece to the (g_μ-2) and the |V_ub| from B → πℓ ν_ℓ differential branching ratio

2018/02/14 by Gonzàlez-Solís, Sergi, Masjuan, Pere, Sanchez-Puertas, Pablo
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.1802.05017

Abstract

We employ a mathematical framework based on rational approximants in order to calculate meson form factors. The method profits from unitary, is systematic and data based, and is able to ascribe a systematic uncertainty which provides for the desired model independence. Two examples are discussed: the transition form factor entering the pseudoscalar-pole piece of the hadronic light-by-light contribution to the anomalous magnetic moment of the muon, and the B → π form factor participating the B→πℓν_ℓ differential branching ratios which allows to determine the |V_ub| CKM parameter.

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