Hypercubic effects in semileptonic decays of heavy mesons, toward B → πℓ ν, with N_f=2+1+1 Twisted fermions

2018/11/26 by V. Lubicz, L. Riggio, Lubicz, V. +5
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.1811.10268

openalex publication_date 2018/11/26 · openalex created_date 2018/11/29 · openalex updated_date 2026/07/28

Abstract

We present a preliminary study toward a lattice determination of the vector and scalar form factors of the B → πℓ ν semileptonic decays. We compute the form factors relative to the transition between heavy-light pseudoscalar mesons, with masses above the physical D-mass, and the pion. We simulate heavy-quark masses in the range m_c^phys < m_h < 2m_c^phys. Lorentz symmetry breaking due to hypercubic effects is clearly observed in the data, and included in the decomposition of the current matrix elements in terms of additional form factors. We discuss the size of this breaking as the parent-meson mass increases. Our analysis is based on the gauge configurations produced by the European Twisted Mass Collaboration with N_f = 2 + 1 + 1 flavors of dynamical quarks at three different values of the lattice spacing and with pion masses as small as 210 MeV.

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• Heavy quark scaling of B→πℓν form factors with Möbius domain wall fermions
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