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Non-Perturbative Renormalisation and Running of BSM Four-Quark Operators in $N_f = 2$ QCD

We perform a non-perturbative study of the scale-dependent renormalisation factors of a complete set of dimension-six four-fermion operators without power subtractions. The renormalisation-group (RG) running is determined in the continuum limit for a specific Schrödinger Functional (SF) renormalisat...

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Autores principales: Dimopoulos, Petros, Herdoíza, Gregorio, Papinutto, Mauro, Pena, Carlos, Preti, David, Vladikas, Anastasioss
Lenguaje:eng
Publicado: 2018
Materias:
Acceso en línea:https://dx.doi.org/10.1140/epjc/s10052-018-6002-y
http://cds.cern.ch/record/2306723
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author Dimopoulos, Petros
Herdoíza, Gregorio
Papinutto, Mauro
Pena, Carlos
Preti, David
Vladikas, Anastasioss
author_facet Dimopoulos, Petros
Herdoíza, Gregorio
Papinutto, Mauro
Pena, Carlos
Preti, David
Vladikas, Anastasioss
author_sort Dimopoulos, Petros
collection CERN
description We perform a non-perturbative study of the scale-dependent renormalisation factors of a complete set of dimension-six four-fermion operators without power subtractions. The renormalisation-group (RG) running is determined in the continuum limit for a specific Schrödinger Functional (SF) renormalisation scheme in the framework of lattice QCD with two dynamical flavours ( $N_\mathrm {\scriptstyle f}= 2$ ). The theory is regularised on a lattice with a plaquette Wilson action and $\text{ O }(a)$ -improved Wilson fermions. For one of these operators, the computation had been performed in Dimopoulos et al. (JHEP 0805, 065 (2008). arXiv:0712.2429 ), the present work completes the study for the rest of the operator basis, on the same simulations (configuration ensembles). The related weak matrix elements arise in several operator product expansions, in $\Delta F = 2$ transitions they contain the QCD long-distance effects, including contributions from beyond-Standard Model (BSM) processes. Some of these operators mix under renormalisation and their RG-running is governed by anomalous dimension matrices. In Papinutto et al. (Eur Phys J C 77(6), 376 (2017). arXiv:1612.06461 ) the RG formalism for the operator basis has been worked out in full generality and the anomalous dimension matrix has been calculated in NLO perturbation theory. Here the discussion is extended to the matrix step-scaling functions, which are used in finite-size recursive techniques. We rely on these matrix-SSFs to obtain non-perturbative estimates of the operator anomalous dimensions for scales ranging from $\mathcal{O}(\Lambda _\mathrm{QCD})$ to $\mathcal{O}(M_\mathrm{W})$ .
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2018
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spelling cern-23067232022-06-30T11:30:24Zdoi:10.1140/epjc/s10052-018-6002-yhttp://cds.cern.ch/record/2306723engDimopoulos, PetrosHerdoíza, GregorioPapinutto, MauroPena, CarlosPreti, DavidVladikas, AnastasiossNon-Perturbative Renormalisation and Running of BSM Four-Quark Operators in $N_f = 2$ QCDhep-latParticle Physics - LatticeWe perform a non-perturbative study of the scale-dependent renormalisation factors of a complete set of dimension-six four-fermion operators without power subtractions. The renormalisation-group (RG) running is determined in the continuum limit for a specific Schrödinger Functional (SF) renormalisation scheme in the framework of lattice QCD with two dynamical flavours ( $N_\mathrm {\scriptstyle f}= 2$ ). The theory is regularised on a lattice with a plaquette Wilson action and $\text{ O }(a)$ -improved Wilson fermions. For one of these operators, the computation had been performed in Dimopoulos et al. (JHEP 0805, 065 (2008). arXiv:0712.2429 ), the present work completes the study for the rest of the operator basis, on the same simulations (configuration ensembles). The related weak matrix elements arise in several operator product expansions, in $\Delta F = 2$ transitions they contain the QCD long-distance effects, including contributions from beyond-Standard Model (BSM) processes. Some of these operators mix under renormalisation and their RG-running is governed by anomalous dimension matrices. In Papinutto et al. (Eur Phys J C 77(6), 376 (2017). arXiv:1612.06461 ) the RG formalism for the operator basis has been worked out in full generality and the anomalous dimension matrix has been calculated in NLO perturbation theory. Here the discussion is extended to the matrix step-scaling functions, which are used in finite-size recursive techniques. We rely on these matrix-SSFs to obtain non-perturbative estimates of the operator anomalous dimensions for scales ranging from $\mathcal{O}(\Lambda _\mathrm{QCD})$ to $\mathcal{O}(M_\mathrm{W})$ .We perform a non-perturbative study of the scale-dependent renormalisation factors of a complete set of dimension-six four-fermion operators. The renormalisation-group (RG) running is determined in the continuum limit for a specific Schr\"dinger Functional (SF) renormalisation scheme in the framework of lattice QCD with two dynamical flavours ( $N_f = 2$ ). The theory is regularised on a lattice with a plaquette Wilson action and $\mathcal{O}(a)$-improved Wilson fermions. For one of these operators, the computation had been performed in ref. [1]; the present work completes the study for the rest of the operator basis, on the same simulations (configuration ensembles). The related weak matrix elements arise in several operator product expansions; in $\Delta F = 2$ transitions they contain the QCD long-distance effects, including contributions from beyond-Standard Model (BSM) processes. Some of these operators mix under renormalisation and their RG-running is governed by anomalous dimension matrices. In ref. [2] the RG formalism for the operator basis has been worked out in full generality and the anomalous dimension matrix has been calculated in NLO perturbation theory. Here the discussion is extended to the matrix step-scaling functions (matrix-SSFs), which are used in finite-size recursive techniques. We rely on these matrix-SSFs to obtain non-perturbative estimates of the operator anomalous dimensions for scales ranging from $\mathcal{O}(\Lambda_{\rm QCD})$ to $\mathcal{O}(M_W)$.arXiv:1801.09455IFT-UAM-CSIC-18-005FTUAM-18-2IFT-UAM/CSIC-18-005; FTUAM-18-2oai:cds.cern.ch:23067232018-01-29
spellingShingle hep-lat
Particle Physics - Lattice
Dimopoulos, Petros
Herdoíza, Gregorio
Papinutto, Mauro
Pena, Carlos
Preti, David
Vladikas, Anastasioss
Non-Perturbative Renormalisation and Running of BSM Four-Quark Operators in $N_f = 2$ QCD
title Non-Perturbative Renormalisation and Running of BSM Four-Quark Operators in $N_f = 2$ QCD
title_full Non-Perturbative Renormalisation and Running of BSM Four-Quark Operators in $N_f = 2$ QCD
title_fullStr Non-Perturbative Renormalisation and Running of BSM Four-Quark Operators in $N_f = 2$ QCD
title_full_unstemmed Non-Perturbative Renormalisation and Running of BSM Four-Quark Operators in $N_f = 2$ QCD
title_short Non-Perturbative Renormalisation and Running of BSM Four-Quark Operators in $N_f = 2$ QCD
title_sort non-perturbative renormalisation and running of bsm four-quark operators in $n_f = 2$ qcd
topic hep-lat
Particle Physics - Lattice
url https://dx.doi.org/10.1140/epjc/s10052-018-6002-y
http://cds.cern.ch/record/2306723
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AT penacarlos nonperturbativerenormalisationandrunningofbsmfourquarkoperatorsinnf2qcd
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