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arXiv 2024年

作者： Alexandrou, Constantia Bacchio, Simone De Santis, Alessandro Evangelista, Antonio Finkenrath, Jacob Frezzotti, Roberto Gagliardi, Giuseppe Garofalo, Marco Kostrzewa, Bartosz Lubicz, Vittorio Romiti, Simone Sanfilippo, Francesco Simula, Silvano Tantalo, Nazario Urbach, Carsten Wenger, Urs Department of Physics University of Cyprus Nicosia20537 Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Konstantinou Kavafi Street Nicosia2121 Cyprus Dipartimento di Fisica and INFN Università di Roma Tor Vergata Via della Ricerca Scientifica 1 RomaI-00133 Italy Bergische Universität Wuppertal Gaußstraße 20 Wuppertal42119 Germany Istituto Nazionale di Fisica Nucleare Sezione di Roma Tre Via della Vasca Navale 84 RomeI-00146 Italy Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 Bonn53115 Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 Bonn53115 Germany Dipartimento di Matematica e Fisica Università Roma Tre and INFN Sezione di Roma Tre Via della Vasca Navale 84 RomeI-00146 Italy Institute for Theoretical Physics Albert Einstein Center for Fundamental Physics University of Bern Sidlerstrasse 5 BernCH-3012 Switzerland

We present a lattice determination of the inclusive decay rate of the process τ 7→ Xusντ in which the τ lepton decays into a generic hadronic state Xus with ūs flavour quantum numbers. Our results have been obtained in nf = 2+1+1 iso-symmetric QCD with full non-perturbative accuracy, without any OPE approximation and, except for the presently missing long-distance isospin-breaking corrections, include a solid estimate of all sources of theoretical uncertainties. This has been possible by using the Hansen-Lupo-Tantalo method [1] that we have already successfully applied in [2] to compute the inclusive decay rate of the process τ 7→ Xudντ in the ūd flavour channel. By combining our first-principles theoretical results with the presently-available experimental data we extract the CKM matrix element |Vus|, the Cabibbo angle, with a 0.9% accuracy, dominated by the experimental error. Copyright © 2024, The Authors. All rights reserved.

关键词： Quantum theory

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Nucleon transverse quark spin densities

arXiv

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arXiv 2022年

作者： Alexandrou, Constantia Bacchio, Simone Constantinou, Martha Dimopoulos, Petros Finkenrath, Jacob Frezzotti, Roberto Hadjiyiannakou, Kyriakos Jansen, Karl Kostrzewa, Bartosz Koutsou, Giannis Spanoudes, Gregoris Urbach, Carsten Department of Physics University of Cyprus P.O. Box 20537 Nicosia1678 Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Kavafi Street Nicosia2121 Cyprus Department of Physics Temple University PhiladelphiaPA19122-1801 United States Parma43124 Italy Dipartimento di Fisica INFN Universitá di Roma Tor Vergata Via della Ricerca Scientifica 1 RomaI-00133 Italy NIC DESY Zeuthen Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 Bonn53115 Germany Bethe Center for Theoretical Physics University of Bonn Germany Helmholtz-Institut für Strahlen- und Kernphysik University of Bonn Germany

We present a calculation of the Mellin moments of the nucleon transverse quark spin densities extracted from the unpolarized and transversity generalized form factors. We use three Nf = 2 + 1 + 1 ensembles of twisted mass fermions with quark masses tuned to their physical values and lattice spacings a ∼ 0.08 fm, a ∼ 0.07 fm and a ∼ 0.06 fm and extrapolate the form factors to the continuum limit. Besides isovector densities we also include results for the tensor charge for each quark flavor using the ensemble with a ∼ 0.08 fm for which we include the disconnected contributions. © 2022, CC BY.

关键词： Approximation theory

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Strange and charm quark contributions to the muon anomalous magnetic moment in lattice QCD with twisted-mass fermions

arXiv

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arXiv 2024年

作者： Alexandrou, C. Bacchio, S. De Santis, A. Evangelista, A. Finkenrath, J. Frezzotti, R. Gagliardi, G. Garofalo, M. Kalntis, N. Kostrzewa, B. Lubicz, V. Pittler, F. Romiti, S. Sanfilippo, F. Simula, S. Tantalo, N. Urbach, C. Wenger, U. Department of Physics University of Cyprus Nicosia20537 Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Konstantinou Kavafi Street Nicosia2121 Cyprus Dipartimento di Fisica INFN Università di Roma "Tor Vergata" Via della Ricerca Scientifica 1 RomaI-00133 Italy Department of Theoretical Physics European Organization for Nuclear Research CERN Genève 23CH-1211 Switzerland Dipartimento di Matematica e Fisica Università Roma Tre INFN Sezione di Roma Tre Via della Vasca Navale 84 RomeI-00146 Italy Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 Bonn53115 Germany Institute for Theoretical Physics Albert Einstein Center for Fundamental Physics University of Bern Sidlerstrasse 5 BernCH-3012 Switzerland High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 Bonn53115 Germany Istituto Nazionale di Fisica Nucleare Sezione di Roma Tre Via della Vasca Navale 84 RomeI-00146 Italy

We present a lattice calculation of the Hadronic Vacuum Polarization (HVP) contribution of the strange and charm quarks to the anomalous magnetic moment of the muon in isospin symmetric QCD. We employ the gauge configurations generated by the Extended Twisted Mass Collaboration (ETMC) with Nf = 2+1+1 flavors of Wilson-clover twisted-mass quarks at five lattice spacings and at values of the quark mass parameters that are close and/or include the isospin symmetric QCD point of interest. After computing the small corrections necessary to precisely match this point, and carrying out an extrapolation to the continuum limit based on the data at lattice spacings a 0.049, 0.057, 0.068, 0.080 fm and spatial lattice sizes up to L 7.6 fm, we obtain aHVP μ (s) = (53.57 ± 0.63) × 10-10 and aHVP μ (c) = (14.56 ± 0.13) × 10-10, for the quark-connected strange and charm contributions, respectively. Our findings agree well with the corresponding results by other lattice groups. Copyright © 2024, The Authors. All rights reserved.

关键词： Magnetic moments

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First moments of the nucleon transverse quark spin densities using lattice QCD

arXiv

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arXiv 2022年

作者： Alexandrou, C. Bacchio, S. Constantinou, M. Dimopoulos, P. Finkenrath, J. Frezzotti, R. Hadjiyiannakou, Kyriakos Jansen, K. Kostrzewa, B. Koutsou, G. Spanoudes, G. Urbach, C. Department of Physics University of Cyprus P.O. Box 20537 Nicosia1678 Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Kavafi Street Nicosia2121 Cyprus Department of Physics Temple University PhiladelphiaPA19122 - 1801 United States Parma43124 Italy Dipartimento di Fisica and INFN Università di Roma "Tor Vergata" Via della Ricerca Scientifica 1 RomaI-00133 Italy NIC DESY Zeuthen Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 Bonn53115 Germany Bethe Center for Theoretical Physics University of Bonn Germany Helmholtz-Institut für Strahlen- und Kernphysik University of Bonn Germany

We present a calculation of the Mellin moments of the transverse quark spin densities in the nucleon using lattice QCD. The densities are extracted from the unpolarized and transversity generalized form factors extrapolated to the continuum limit using three Nf = 2 + 1 + 1 twisted mass fermion gauge ensembles simulated with physical quark masses and spanning three lattice spacings. The first moment of transversely polarized quarks in an unpolarized nucleon shows an interesting distortion, which can be traced back to the sharp falloff of the transversity generalized form factor B¯Tn0(t). The isovector tensor anomalous magnetic moment is determined to be κT = 1.051(94), which confirms a negative and large Boer-Mulders function, h⊥1 , in the nucleon. Copyright © 2022, The Authors. All rights reserved.

关键词： Approximation theory

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Probing the Energy-Smeared R Ratio Using Lattice QCD

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Physical Review Letters 2023年第24期130卷 241901-241901页

作者： Constantia Alexandrou Simone Bacchio Alessandro De Santis Petros Dimopoulos Jacob Finkenrath Roberto Frezzotti Giuseppe Gagliardi Marco Garofalo Kyriakos Hadjiyiannakou Bartosz Kostrzewa Karl Jansen Vittorio Lubicz Marcus Petschlies Francesco Sanfilippo Silvano Simula Nazario Tantalo Carsten Urbach Urs Wenger Department of Physics University of Cyprus 20537 Nicosia Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Konstantinou Kavafi Street 2121 Nicosia Cyprus Dipartimento di Fisica and INFN Università di Roma Tor Vergata Via della Ricerca Scientifica 1 I-00133 Roma Italy Dipartimento di Scienze Matematiche Fisiche e Informatiche Università di Parma and INFN Gruppo Collegato di Parma Parco Area delle Scienze 7/a (Campus) 43124 Parma Italy Istituto Nazionale di Fisica Nucleare Sezione di Roma Tre Via della Vasca Navale 84 I-00146 Rome Italy HISKP (Theory) Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 53115 Bonn Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 53115 Bonn Germany NIC DESY Platanenallee 6 D-15738 Zeuthen Germany Dipartimento di Matematica e Fisica Università Roma Tre and INFN Sezione di Roma Tre Via della Vasca Navale 84 I-00146 Rome Italy Institute for Theoretical Physics Albert Einstein Center for Fundamental Physics University of Bern Sidlerstrasse 5 CH-3012 Bern Switzerland

We present a first-principles lattice QCD investigation of the R ratio between the e+e− cross section into hadrons and into muons. By using the method of Ref. [1], that allows one to extract smeared spectral densities from Euclidean correlators, we compute the R ratio convoluted with Gaussian smearing kernels of widths of about 600 MeV and central energies from 220 MeV up to 2.5 GeV. Our theoretical results are compared with the corresponding quantities obtained by smearing the KNT19 compilation [2] of R-ratio experimental measurements with the same kernels and, by centering the Gaussians in the region around the ρ-resonance peak, a tension of about 3 standard deviations is observed. From the phenomenological perspective, we have not included yet in our calculation QED and strong isospin-breaking corrections, and this might affect the observed tension. From the methodological perspective, our calculation demonstrates that it is possible to study the R ratio in Gaussian energy bins on the lattice at the level of accuracy required in order to perform precision tests of the standard model.

关键词： Hadron-hadron interactions Lattice QCD

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Pion transition form factor from twisted-mass lattice QCD and the hadronic light-by-light π0-pole contribution to the muon g−2

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Physical Review D 2023年第9期108卷 094514-094514页

作者： C. Alexandrou S. Bacchio G. Bergner S. Burri J. Finkenrath A. Gasbarro K. Hadjiyiannakou K. Jansen G. Kanwar B. Kostrzewa G. Koutsou K. Ottnad M. Petschlies F. Pittler F. Steffens C. Urbach U. Wenger Department of Physics University of Cyprus 20537 Nicosia Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Konstantinou Kavafi Street 2121 Nicosia Cyprus University of Jena Institute for Theoretical Physics Max-Wien-Platz 1 D-07743 Jena Germany Albert Einstein Center for Fundamental Physics Institute for Theoretical Physics University of Bern Sidlerstrasse 5 CH–3012 Bern Switzerland Bergische Universität Wuppertal Gaußstraße 20 42119 Wuppertal Germany Deutsches Elektronen-Synchrotron DESY Platanenallee 6 15738 Zeuthen Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 D-53115 Bonn Germany PRISMA+ Cluster of Excellence and Institut für Kernphysik Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 D-55128 Mainz Germany HISKP (Theory) Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 D-53115 Bonn Germany Bethe Center for Theoretical Physics Rheinische Friedrich-Wilhelms-Universität Bonn Wegelerstraße 10 D-53115 Bonn Germany

The neutral pion generates the leading pole contribution to the hadronic light-by-light tensor, which is given in terms of the nonperturbative transition form factor Fπ0γγ(q12,q22). Here we present an ab-initio lattice calculation of this quantity in the continuum and at the physical point using twisted-mass lattice QCD. We report our results for the transition form factor parametrized using a model-independent conformal expansion valid for arbitrary spacelike kinematics and compare it with experimental measurements of the single-virtual form factor, the two-photon decay width, and the slope parameter. We then use the transition form factors to compute the pion-pole contribution to the hadronic light-by-light scattering in the muon g−2, finding aμπ0−pole=56.7(3.2)×10−11.

关键词： Lattice field theory Magnetic moment Pions Form factors Ab initio calculations Lattice QCD Path-integral Monte Carlo

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Lattice calculation of the short and intermediate time-distance hadronic vacuum polarization contributions to the muon magnetic moment using twisted-mass fermions

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Physical Review D 2023年第7期107卷 074506-074506页

作者： C. Alexandrou S. Bacchio P. Dimopoulos J. Finkenrath R. Frezzotti G. Gagliardi M. Garofalo K. Hadjiyiannakou B. Kostrzewa K. Jansen V. Lubicz M. Petschlies F. Sanfilippo S. Simula C. Urbach U. Wenger Department of Physics University of Cyprus 20537 Nicosia Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Konstantinou Kavafi Street 2121 Nicosia Cyprus Dipartimento di Scienze Matematiche Fisiche e Informatiche Università di Parma and INFN Gruppo Collegato di Parma Parco Area delle Scienze 7/a (Campus) 43124 Parma Italy Dipartimento di Fisica and INFN Università di Roma “Tor Vergata” Via della Ricerca Scientifica 1 I-00133 Roma Italy Istituto Nazionale di Fisica Nucleare Sezione di Roma Tre Via della Vasca Navale 84 I-00146 Rome Italy HISKP (Theory) Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 53115 Bonn Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 53115 Bonn Germany NIC DESY Platanenallee 6 D-15738 Zeuthen Germany Dipartimento di Matematica e Fisica Università Roma Tre and INFN Sezione di Roma Tre Via della Vasca Navale 84 I-00146 Rome Italy Institute for Theoretical Physics Albert Einstein Center for Fundamental Physics University of Bern Sidlerstrasse 5 CH-3012 Bern Switzerland

We present a lattice determination of the leading-order hadronic vacuum polarization (HVP) contribution to the muon anomalous magnetic moment, aμHVP, in the so-called short and intermediate time-distance windows, aμSD and aμW, defined by the RBC/UKQCD Collaboration [Phys. Rev. Lett. 121, 022003 (2018)]. We employ gauge ensembles produced by the Extended Twisted Mass Collaboration (ETMC) with Nf=2+1+1 flavors of Wilson-clover twisted-mass quarks with masses of all the dynamical quark flavors tuned close to their physical values. The simulations are carried out at three values of the lattice spacing equal to ≃0.057, 0.068 and 0.080 fm with spatial lattice sizes up to L≃7.6 fm. For the short-distance window we obtain aμSD(ETMC)=69.27(34)×10−10, which is consistent with the recent dispersive value of aμSD(e+e−)=68.4(5)×10−10 [, Phys. Lett. B 833, 137313 (2022)]. In the case of the intermediate window we get the value aμW(ETMC)=236.3(1.3)×10−10, which is consistent with the result aμW(BMW)=236.7(1.4)×10−10 [, Nature (London) 593, 51 (2021)] by the BMW Collaboration as well as with the recent determination by the CLS/Mainz group of aμW(CLS)=237.30(1.46)×10−10 [, Phys. Rev. D 106, 114502 (2022)]. However, it is larger than the dispersive result of aμW(e+e−)=229.4(1.4)×10−10 by approximately 3.6 standard deviations. The tension increases to approximately 4.5 standard deviations if we average our ETMC result with those by BMW and CLS/Mainz. Our accurate lattice results in the short and intermediate windows point to a possible deviation of the e+e− cross section data with respect to Standard Model predictions in the low- and intermediate-energy regions but not in the high-energy region.

关键词： Magnetic moment Strong interaction Muons Quarks Lattice QCD Monte Carlo methods

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Pion Transition Form Factor from Twisted-Mass Lattice QCD and the Hadronic Light-by-Light π0-pole Contribution to the Muon g − 2

arXiv

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arXiv 2023年

作者： Alexandrou, C. Bacchio, S. Bergner, G. Burri, S. Finkenrath, J. Gasbarro, A. Hadjiyiannakou, K. Jansen, K. Kanwar, G. Kostrzewa, B. Koutsou, G. Ottnad, K. Petschlies, M. Pittler, F. Steffens, F. Urbach, C. Wenger, U. Department of Physics University of Cyprus Nicosia20537 Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Konstantinou Kavafi Street Nicosia2121 Cyprus University of Jena Institute for Theoretical Physics Max-Wien-Platz 1 JenaD-07743 Germany Albert Einstein Center for Fundamental Physics Institute for Theoretical Physics University of Bern Sidlerstrasse 5 BernCH–3012 Switzerland Bergische Universität Wuppertal Gaußstraße 20 Wuppertal42119 Germany Deutsches Elektronen-Synchrotron DESY Platanenallee 6 Zeuthen15738 Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Friedrich-Hirzebruch-Allee 8 BonnD-53115 Germany PRISMA+ Cluster of Excellence Institut für Kernphysik Johannes Gutenberg-Universität Mainz Johann-Joachim-Becher-Weg 45 MainzD-55128 Germany Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 BonnD-53115 Germany Bethe Center for Theoretical Physics Rheinische Friedrich-Wilhelms-Universität Bonn Wegelerstraße 10 BonnD-53115 Germany

The neutral pion generates the leading pole contribution to the hadronic light-by-light tensor, which is given in terms of the nonperturbative transition form factor (formula presented). Here we present an ab-initio lattice calculation of this quantity in the continuum and at the physical point using twisted-mass lattice QCD. We report our results for the transition form factor parameterized using a model-independent conformal expansion valid for arbitrary space-like kinematics and compare it with experimental measurements of the single-virtual form factor, the two-photon decay width, and the slope parameter. We then use the transition form factors to compute the pion-pole contribution to the hadronic light-by-light scattering in the muon g − 2, finding (formula presented). Copyright © 2023, The Authors. All rights reserved.

关键词： Poles

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Quark and Gluon Momentum Fractions in the Pion from Nf=2+1+1 Lattice QCD

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Physical Review Letters 2021年第25期127卷 252001-252001页

作者： Constantia Alexandrou Simone Bacchio Georg Bergner Jacob Finkenrath Andrew Gasbarro Kyriakos Hadjiyiannakou Karl Jansen Bartosz Kostrzewa Konstantin Ottnad Marcus Petschlies Ferenc Pittler Fernanda Steffens Carsten Urbach Urs Wenger Department of Physics University of Cyprus Nicosia 2109 Cyprus Computation-based Science and Technology Research Center The Cyprus Institute Nicosia 2121 Cyprus Institute of Theoretical Physics Friedrich Schiller University Jena Jena 07743 Germany Albert Einstein Center Institute for Theoretical Physics University of Bern Bern CH-3012 Switzerland NIC DESY Zeuthen 15738 Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Bonn 53115 Germany PRISMA+ Cluster of Excellence and Institut für Kernphysik Johannes Gutenberg-Universität Mainz Mainz 55099 Germany Helmholtz-Institut für Strahlen- und Kernphysik University of Bonn Bonn 53115 Germany Bethe Center for Theoretical Physics University of Bonn Bonn 53115 Germany Department of Theoretical Physics CERN Geneva CH-1211 Switzerland

We perform the first full decomposition of the pion momentum into its gluon and quark contributions. We employ an ensemble generated by the Extended Twisted Mass Collaboration with Nf=2+1+1 Wilson twisted mass clover fermions at maximal twist tuned to reproduce the physical pion mass. We present our results in the MS¯ scheme at 2 GeV. We find ⟨x⟩u+d=0.601(28), ⟨x⟩s=0.059(13), ⟨x⟩c=0.019(05), and ⟨x⟩g=0.52(11) for the separate contributions, respectively, whose sum saturates the momentum sum rule.

关键词： Lattice QCD Quantum chromodynamics

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Quark and gluon momentum fractions in the pion from Nf = 2 + 1 + 1 lattice QCD

arXiv

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arXiv 2021年

作者： Alexandrou, Constantia Bacchio, Simone Bergner, Georg Finkenrath, Jacob Gasbarro, Andrew Hadjiyiannakou, Kyriakos Jansen, Karl Kostrzewa, Bartosz Ottnad, Konstantin Petschlies, Marcus Pittler, Ferenc Steffens, Fernanda M. Urbach, Carsten Wenger, Urs Department of Physics University of Cyprus Nicosia Cyprus Computation-Based Science and Technology Research Center The Cyprus Institute Nicosia Cyprus Institute of Theoretical Physics Friedrich Schiller University Jena Germany Albert Einstein Center Institute for Theoretical Physics University of Bern Switzerland NIC DESY Zeuthen Germany High Performance Computing and Analytics Lab Rheinische Friedrich-Wilhelms-Universität Bonn Germany PRISMA+ Cluster of Excellence and Institut für Kernphysik Johannes Gutenberg-Universität Mainz Germany Helmholtz-Institut für Strahlen- und Kernphysik University of Bonn Germany Bethe Center for Theoretical Physics University of Bonn Germany Department of Theoretical Physics CERN Geneva Switzerland

We perform the first full decomposition of the pion momentum into its gluon and quark contributions. We employ an ensemble generated by the Extended Twisted Mass Collaboration with Nf = 2 + 1 + 1 Wilson twisted mass clover fermions at maximal twist tuned to reproduce the physical pion mass. We present our results in the MS scheme at 2 GeV. We find 〈 x〉u+d = 0.601(28), 〈x〉s = 0.059(13), 〈x〉c = 0.019(05), and 〈x〉g = 0.52(11) for the separate contributions, respectively, whose sum saturates the momentum sum rule. Copyright © 2021, The Authors. All rights reserved.

关键词： Hadrons

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