J. Finkenrath

Spin and momentum fraction carried by partons in the nucleon

Constantia Alexandrou, Simone Bacchio, Jacob Finkenrath +6

We determine the momentum fraction and angular momentum carried by quarks and gluons in the proton in lattice QCD. We use four ensembles simulated with up, down, strange and charm…

Nucleon unpolarized second Mellin moments using lattice QCD ensembles with physical quark masses and in the continuum limit

Constantia Alexandrou, Simone Bacchio, Jacob Finkenrath +6

We compute the matrix elements of the energy-momentum tensor of the nucleon using four ensembles of twisted mass clover-improved fermions with the up, down, strange and charm quark…

Nucleon strange electromagnetic form factors using $N_{f} = 2 + 1 + 1$ twisted-mass fermions at the physical point

Constantia Alexandrou, Simone Bacchio, Mathis Bode +7

We present the strange electromagnetic form factors of the nucleon using lattice QCD with $N_{f} = 2 + 1 + 1$ twisted mass clover-improved fermions and quark masses tuned to their physical…

Strangeness of nucleons from $N_{f} = 2 + 1 + 1$ lattice QCD

Constantia Alexandrou, Simone Bacchio, Mathis Bode +7

We present the strange electromagnetic form factors of the nucleon using lattice QCD simulations with degenerate light, a strange, and a charm quark in the sea with masses tuned to…

Nucleon strange electromagnetic form factors from $N_{f} = 2 + 1 + 1$ lattice QCD

Constantia Alexandrou, Simone Bacchio, Mathis Bode +7

We present the nucleon strange electromagnetic form factors using four lattice QCD ensembles with $N_{f} = 2 + 1 + 1$ twisted mass clover-improved fermions and quark masses tuned to approx…

hep-lat2025

Quark and gluon momentum fractions in the pion and in the kaon

Constantia Alexandrou, Simone Bacchio, Martha Constantinou +9

We present results on the momentum fraction carried by quarks and gluons in the pion and the kaon. We employ three gauge ensembles generated with $N_{f} = 2 + 1 + 1$ Wilson twisted-mass cl…

hep-lat2025

Isovector axial and pseudoscalar form factors from twisted mass lattice QCD at the physical point

Constantia Alexandrou, Simone Bacchio, Martha Constantinou +6

We present the isovector axial, induced pseudoscalar, and pseudoscalar form factors of the nucleon using three twisted-mass fermion ensembles with degenerate up- and down-, strange…

hep-lat2025

Nucleon axial, tensor, and scalar charges and $σ$ -terms in lattice QCD

Constantia Alexandrou, Simone Bacchio, Jacob Finkenrath +4

We determine the nucleon axial, scalar and tensor charges at the continuum limit by analyzing three $N_{f} = 2 + 1 + 1$ twisted mass fermion ensembles with all quark masses tuned to approx…

Nucleon charges and $σ$ -terms in lattice QCD

C. Alexandrou, S. Bacchio, J. Finkenrath +4

We determine the nucleon axial, scalar and tensor charges and the nucleon $σ$ -terms using twisted mass fermions. We employ three ensembles with approximately equal physical volume…

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

C. Alexandrou, S. Bacchio, A. De Santis +15

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 symm…

hep-lat2024★ 1 cited

Quark and gluon momentum fractions in the pion and in the kaon

Constantia Alexandrou, Simone Bacchio, Martha Constantinou +9

We present the full decomposition of the momentum fraction carried by quarks and gluons in the pion and the kaon. We employ three gauge ensembles generated with $N_{f} = 2 + 1 + 1$ Wilson…

$b ˉ b ˉ u d$ and $b ˉ b ˉ u s$ tetraquarks from lattice QCD using symmetric correlation matrices with both local and scattering interpolating operators

Constantia Alexandrou, Jacob Finkenrath, Theodoros Leontiou +3

We study the $b ˉ b ˉ u d$ tetraquark with quantum numbers $I (J^{P}) = 0 (1^{+})$ as well as the $b ˉ b ˉ u s$ tetraquark with quantum numbers $J^{P} = 1^{+}$ using lattice QCD.…

Inclusive hadronic decay rate of the $τ$ lepton from lattice QCD: the $u ˉ s$ flavour channel and the Cabibbo angle

C. Alexandrou, S. Bacchio, A. De Santis +13

We present a lattice determination of the inclusive decay rate of the process $τ \mapsto X_{u s} ν_{τ}$ in which the $τ$ lepton decays into a generic hadronic state $X_{u s}$ with $\bar…

hep-lat2023★ 30 cited

Shallow Bound States and Hints for Broad Resonances with Quark Content $b ˉ c ˉ u d$ in $B$ - $D ˉ$ and $B^{*}$ - $D ˉ$ Scattering from Lattice QCD

Constantia Alexandrou, Jacob Finkenrath, Theodoros Leontiou +3

We present the first determination of the energy dependence of the $B$ - $D ˉ$ and $B^{*}$ - $D ˉ$ isospin-0, $S$ -wave scattering amplitudes both below and above the thresholds u…

hep-lat2023★ 1 cited

Nucleon axial and pseudoscalar form factors using twisted-mass fermion ensembles at the physical point

Constantia Alexandrou, Simone Bacchio, Martha Constantinou +6

We compute the nucleon axial and pseudoscalar form factors using three $N_{f} =$ 2+1+1 twisted mass fermion ensembles with all quark masses tuned to approximately their physical values…

hep-lat2023

Low-lying baryon masses using twisted mass fermions ensembles at the physical pion mass

Constantia Alexandrou, Simone Bacchio, Georgios Christou +1

We investigate the low-lying baryon spectrum using three $N_{f}$ =2+1+1 ensembles simulated with physical values of the quark masses and lattice spacings of 0.080, 0.069, and 0.057 fm…

hep-lat2023★ 13 cited

Pion Transition Form Factor from Twisted-Mass Lattice QCD and the Hadronic Light-by-Light $π^{0}$ -pole Contribution to the Muon $g - 2$

C. Alexandrou, S. Bacchio, G. Bergner +14

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 $\mathcal{F}_{…

Lattice calculation of the R-ratio smeared with Gaussian kernel

Constantia Alexandrou, Simone Bacchio, Alessandro De Santis +15

The ratio $R (E)$ of the cross-sections for $e^{+} e^{-} \to$ hadrons and $e^{+} e^{-} \to μ^{+} μ^{-}$ is a valuable energy-dependent probe of the hadronic sector of the Standard Model. Moreover, t…

hep-ph2022

Short \& intermediate distance HVP contributions to muon g-2: SM (lattice) prediction versus $e^{+} e^{-}$ annihilation data

Constantia Alexandrou, Simone Bacchio, Petros Dimopoulos +13

We present new lattice results of the ETM Collaboration, obtained from extensive simulations of lattice QCD with dynamical up, down, strange and charm quarks at physical mass value…

hep-lat2022★ 1 cited

Pseudoscalar-pole contributions to the muon $g - 2$ at the physical point

Sebastian Burri, Gurtej Kanwar, Constantia Alexandrou +14

Pseudoscalar-pole diagrams are an important component of estimates of the hadronic light-by-light (HLbL) contribution to the muon $g - 2$ . We report on our computation of the transit…

Time windows of the muon HVP from twisted-mass lattice QCD

C. Alexandrou, S. Bacchio, P. Dimopoulos +13

We present a lattice determination of the leading-order hadronic vacuum polarization (HVP) contribution to the muon anomalous magnetic moment, $a_{μ}^{HVP}$ , in the so-called sho…

Non-perturbative renormalization of quark and gluon operators using a gauge-invariant scheme

G. Spanoudes, C. Alexandrou, J. Finkenrath +3

We present preliminary results for the renormalization functions (RFs) of a number of quark and gluon operators studied in lattice QCD using a gauge-invariant renormalization schem…

hep-lat2022★ 1 cited

Disconnected contribution to the LO HVP term of muon g-2 from ETMC

Constantia Alexandrou, Simone Bacchio, Petros Dimopoulos +13

We present a lattice determination of the disconnected contributions to the leading-order hadronic vacuum polarization (HVP) to the muon anomalous magnetic moment in the so-called…