ETMC Meeting 2026

25 Feb 2026, 10:00 → 27 Feb 2026, 13:30 Asia/Nicosia

The Cyprus Institute

 

Those joining remotely can connect via Zoom using the link: http://tiny.cc/zoom-etmc

 

This event is supported by the projects MuonHVP (EXCELLENCE/0524/0017) and IMAGE-N  (EXCELLENCE/0524/0459) co-financed by the European Regional Development Fund and the Republic of Cyprus through the Research and Innovation Foundation within the framework of the Cohesion Policy Programme “THALIA 2021-2027”

Wednesday 25 February

Session: 2 Talks (Garofalo, Bacchio) + Discussion (Inclusive)

1 Inclusive Semileptonic Decay from Lattice QCD

In this talk, we present the first fully non-perturbative computation of the decay rate of $D_s\to X\ell\nu$ and of the associated leptonic moments, carried out on state-of-the-art ETMC ensembles at the physical point with four lattice spacings and three volumes. The extraction of the relevant smeared spectral densities from Euclidean four-point correlation functions has been performed with controlled statistical and systematic uncertainties by using the Hansen-Lupo-Tantalo method. Additionally, we present preliminary results of our ongoing calculation of the inclusive semi-leptonic $B_s$ mesons decay rates with focus on some important technical aspects of the calculation.

Speaker: marco garofalo (University of Bonn, HISKP)

etmc_2026.pdf

2 Opportunities with hyperon and charmed baryon decays

Overview of our work and other opportunities

Speaker: Dr Simone Bacchio (The Cyprus Institute)

Opportunities with Hyperons and Charmed baryons.pdf

Opportunities with Hyperons and Charmed baryons (unredacted).pdf

3 Discussion on inclusive for baryons

Speaker: Dr Simone Bacchio (The Cyprus Institute)

11:30 Coffee Break

Session: 3 Talks (Iona, Li, Prasad)

4 Nucleon axial, tensor, and scalar charges and $\sigma$-terms in lattice QCD

We present results for the nucleon axial, scalar, and tensor charges, as well as the nucleon $\sigma$-terms, using four twisted mass fermion ensembles at four lattice spacings, including one at a finer lattice spacing of $\sim 0.05$ fm. The masses of the degenerate up and down, strange, and charm quarks are tuned to approximately their physical values. We compute both isovector and isoscalar charges and their flavor decomposition, including disconnected contributions. Systematic uncertainties associated with excited-state contamination and the continuum extrapolation are assessed using the Akaike information criterion.

Speaker: Christos Iona (University of Cyprus & The Cyprus Institute)

ETMC_Meeting_2026.pdf

5 Quark and Gluon Momentum and Spin Fractions in the Nucleon

We present the full decomposition of the momentum and spin fractions carried by quarks and gluons in the nucleon. We employ three gauge ensembles generated with Nf=2+1+1 Wilson twisted-mass clover-improved fermions at the physical quark masses. It allows us to determine for the first time the momentum and spin decompositions at the continuum limit with the extrapolation directly performed at the physical pion mass.

Speaker: Yan Li

moments-ETMC2026.pdf

6 Nucleon electromagnetic form factors using $N_f=2+1+1$ twisted-mass fermions at the physical point

We present the results for the electromagnetic form factors of the proton and neutron using three ensembles of twisted mass fermions at the physical point. Studying the momentum transfer dependence of the form factors resulting from a multi-state fitting procedure, we obtain the electric and magnetic radii and the magnetic moments in the continuum limit. Furthermore, we extend the analysis to obtain the strange nucleon electromagnetic form factors using four ensembles of twisted mass fermions. The disconnected strange contributions are computed with high statistics two-point functions combined with the quark loop computed by employing stochastic noise mitigation techniques such as spin-color dilution and hierarchical probing. Our final results include systematics arising from excited states, cut-off effects, the functional form of the momentum transfer dependence and the momenta cuts.

Speaker: Bhavna Prasad (The Cyprus Institute)

ETMC_2026_bp.pdf

13:30 Lunch break

Session: 3 Talks (Sanfilippo, Romiti, Gagliardi)

7 Radiative decay of Kaons and Charmonia

Speaker: Francesco Sanfilippo (INFN Roma Tre)

ciripiri cipro.pdf

8 Progress in the HLbL contribution

We present a lattice calculation of the Hadronic Light by Light (HLbL) contribution of the strange- and charm-quark connected contributions to the anomalous magnetic moment of the muon. We employ the gauge configurations generated by the Extended Twisted Mass Collaboration (ETMC) with $N_f = 2 + 1 + 1$ flavors of Wilson-clover twisted-mass quarks at four lattice spacings at the physical point.
We perform a careful check of the potential sources of systematic errors and implement an extrapolation to the continuum limit based on the data at lattice spacings $a \simeq 0.049, 0.057, 0.068, 0.080$~fm (ensembles cB, cC, cD).
We also present our preliminary results of the light-quark contributions coming from the fully connected and (2+2) disconnected diagrams for the ensembles cB, cC.

Speaker: Simone Romiti

Romiti-Cyprus_talk.pdf

9 Update on muon g-2

Speaker: Giuseppe Gagliardi

GG.pdf

16:00 Coffee Break

Session: 1 Talk (Evangelista, Tantalo) + Discussion (QED and LIBE)

10 QED and LIBE

An update on the ongoing effort to compute QED corrections to isoQCD observables. We will discuss the general computational strategy, focusing on the scale setting and the observables proposed in the November proposal. Finally, we will give a brief update on the baryon-splitting program we already started.

Speaker: Dr Antonio Evangelista (University of Cyprus)

ETMCmeet_AE.pdf

11 Update on tau

...

Speaker: Nazario Tantalo (Universita e INFN Roma Tor Vergata (IT))

12 Discussion on QED and LIBE

Speaker: Nazario Tantalo (Universita e INFN Roma Tor Vergata (IT))

19:00 Social Dinner (Orfeas)

https://maps.app.goo.gl/xdkpB3jonk2EEHgv5

Thursday 26 February

Session: 3 Talks (Kummer, Pierini, Spanoudes)

13 Nucleon higher mellin moments

Speaker: Christian Kummer (University of cyprus)

ETMC presentation.pdf

ETMC presentation.pdf

ETMC presentation.pptx

14 PDF and GPDs

We present a lattice QCD analysis of unpolarised generalised parton distributions (GPDs) of the proton. Our calculations are done on the B64 ensemble, with
Nf = 2 + 1 + 1 (degenerate light quarks, strange and charm quarks) twisted
mass fermions at physical mass with a clover improvement and lattice spacing
a = 0.08 fm. We use Large Momentum Effective Theory (LaMET) to anlayse
and match the quasi-GPDs to their light-cone distributions in the asymmetric kinematic frame. Our analysis has been performed with several values of the momentum transfer −t, from 0 to 1.2 at zero-skewness and boost up until 1.7 GeV, with Bayesian-Fourier transform employed to extract the x-dependence. We use the quasi-GPDs to define the pseudo-GPDs in order to extract the Mellin moments.

Speaker: Gabriele Pierini (ETH Zuerich)

GPDs_ETMC.pdf

15 TMDPDFs in twisted-mass lattice QCD

We present a lattice QCD calculation of the unpolarized transverse-momentum dependent parton distribution function (TMD PDF) of the nucleon using Large Momentum Effective Field Theory. The calculation is based on the evaluation of three key ingredients entering the TMD factorization formula: the quasi-TMD PDF, the Collins–Soper kernel, and the reduced soft function. We employ three $N_f=2+1+1$ twisted-mass fermion ensembles, including an ensemble at the physical pion mass. Our study relies on matrix elements of asymmetric staple-shaped quark bilinear operators and includes a nonperturbative renormalization analysis using two complementary schemes.

Speaker: Dr Gregoris Spanoudes (University of Cyprus)

ETMC_meeting_2026_Gregoris_Spanoudes.pdf

11:30 Coffee break

Session: 2 Talks (Di Carlo, Frezzotti, Spanoudes) + Discussion (Renormalization)

16 Renormalization and Quark Masses

Speaker: Matteo Di Carlo (CERN)

etmc_meeting_2026_mdc_2.pdf

17 Additional comments by Roberto and Gregoris

Speaker: Roberto Frezzotti

18 Discussion on Renormalization

Speaker: Dr Gregoris Spanoudes (University of Cyprus)

ETMC_meeting_Gregoris_Spanoudes.pdf

13:30 Lunch break

Session: 2 Talks (Gregoriou, Sen) + Discussion (Software)

19 Diagonal Kenney-Laub Rational Approximation to the Overlap Dirac Operator

Preliminary results are presented for a novel formulation of the overlap Dirac operator in lattice QCD that employs the diagonal Kenney-Laub (KL) iterates to approximate the matrix sign function. KL iterates require no information about the spectrum of the kernel operator and, when expressed via their partial fraction decomposition, offer a practical alternative for approximating the matrix sign function. We evaluate this approach in a proof-of-concept implementation using quenched lattices at $\beta=6.20$ and two discretizations of the Dirac operator as a kernel, namely the standard Wilson operator and the Brillouin operator. By examining the violation of the Ginsparg-Wilson relation (using a specific metric) and the critical bare quark mass for increasing approximation order, we find that KL-iterates exhibit improved chiral symmetry preservation and computational efficiency compared to the Chebyshev polynomial and Zolotarev rational approaches.

Speaker: Mr Stylianos Gregoriou (The Cyprus Institute)

ETMC_Meeting_2026_Diagonal_KL.pdf

20 Kronos : Lattice QCD with Kokkos

Status update on Kronos

Speaker: Aniket Sen

kronos-etmc-2026.pdf

21 Discussion on Software

Speaker: Bartosz Kostrzewa (HISKP, Theory, University of Bonn)

ETMC Softare Discussion Slides

16:00 Coffee break

Session: 1 Talk (Finkenrath) + Long Discussion (Simulations)

22 Status of Simulations

TODO

Speaker: Jacob Friedrich Finkenrath

23 Discussion on Simulations

Speaker: Carsten Urbach (University of Bonn)

19:00 Social Gathering (Brothers Bar & Grill)

https://maps.app.goo.gl/zxVYhFuYJMJjZFPU8

Friday 27 February

Session: 1 Talk (Paul) + Discussion (Lattice2027, Lattice QCD@50 book)

24 ππ scattering

Speaker: Dr Srijit Paul (University of Mainz)

25 Lattice 2027

Speaker: Constantia Alexandrou

26 Lattice QCD@50 book

Speaker: Urs Wenger (University of Bern)

11:30 Coffee break

Session: Closing remarks (Optional)