sister Maria Celeste. They are the ones who gave me the chance to pursue my dreams. Also, to my grandmother Maria da Paz Fangueiro. Yet not here to celebrate my recent footsteps, she was fundamental to my growth since I was a child, high school student, and also undergraduate student. I will always be grateful to all of you.
In these proceedings we present an exact distillation setup with stabilised Wilson fermions at the(3) flavour symmetric point utilising the flexibility of the Grid and Hadrons software libraries.This work is a stepping stone towards a non-perturbative investigation of hadronic -decays, for which one needs to control the multi-hadron final states. As a first step we study two-to-two -wave scattering of pseudoscalar mesons. In particular we examine the reliability of the extraction of finite-volume energies as a function of the number of eigenvectors of the gauge-covariant Laplacian entering our distillation setup.
Resonances play an important role in Standard Model phenomenology. In particular, hadronic resonances feature in B and D decays, which can be central for New Physics searches. Lattice QCD simulations combined with the finite-volume method can nowadays be used to reliably study strongly coupled scattering processes such as Kπ and thus the hadronic resonance K * . In this work, we approach Kπ scattering on a domain-wall N f = 2 + 1 RBC-UKQCD ensemble at a physical pion mass. We use the distillation method within Grid and Hadrons software to compute sets of operator basis. That allows solving an eigenvalue problem to extract the low-energy finitevolume spectra, which are then translated into scattering information. We update the state of the calculation by reviewing the smearing process, outlining the variational analysis and concluding by showing preliminary data.
Scattering at physical pion mass is still an exploratory field in lattice QCD. This generally involves the extraction of excited states through multi-particle correlators on systems with resonances. In that context, distillation has been demonstrated to be effective both as a smearing kernel and a computational tool. Motivated by the study of the smearing profile of the distillation operator, we compare stochastic and exact distillation cases for different numbers of Laplacian eigenvectors using a RBC-UKQCD 𝑁 𝑓 = 2 + 1 domain-wall fermion lattice with a physical pion mass.
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