8th Plenary workshop of the Muon g-2 Theory Initiative 2025

8 sept. 2025, 08:30 → 12 sept. 2025, 17:00 Europe/Paris

200/0- Auditorium P. Lehmann (IJCLab)

The Eighth Plenary Workshop of the Muon g-2 Theory Initiative, jointly organised by CPT, IJCLab and LPNHE, will be held at IJCLab from 8th to 12th of September 2025. The anomalous magnetic moment of the Muon (Muon g-2) has been receiving great attention, particularly in light of the final result from Fermilab’s E989 experiment and of the intense theoretical effort to match its precision, as well as new forthcoming precision measurements of the dominant two-pion channel. The workshop aims at discussing recent progress on these developments and future prospects.

 

Important deadlines:

Abstract submission: June 30

Early registration : June 30

Late registration : July 25

 

 

 

 

Affiche-8th-WS-Muons-theory-initiative-V3-4K.jpg

Affiche-8th-WS-Muons-theory-initiative-V3.jpg

IJCLab-map-A4-RectoVerso-web_010324 copie.pdf

parcours_RER_Orsay_Bures_Bat_200_IJCLab.pdf

lun. 8 septembre

08:30 → 09:20 Registration with coffee

09:20 → 09:30 Welcome speech by director Achille Stocchi & introduction (slides) from organizers

Informations.pdf

09:30 → 10:30 g-2 measurements

Président de session: Thomas Teubner

09:30 Fermilab final result

Orateur: Alberto Lusiani

alusiani-gm2ti-orsay-sep25.pdf

10:00 Experiment update J-PARC

Orateur: Tsutomu Mibe

muong-2TI-Orsay-mibe-pub.pdf

10:30 → 11:00 Coffee break

11:00 → 15:30 Experimental inputs HVP

Président de session: Toru Iijma

11:00 CMD2/3 (remote)

Orateur: Evgeny Solodov

Solodov_CMD_TI_2025_09.pdf

11:30 BABAR new pipi measurement

Orateur: Andres Pinto (LPNHE - CNRS)

g_2_workshop_AP.pdf

12:00 KLOE

Orateur: Lorenzo Cotrozzi

Cotrozzi_KLOE_8g-2TI.pdf

12:30 BESIII

Orateur: Weiping Wang

Muon_g-2_Orsay_wangwp_20250908.pdf

13:00 Lunch

14:30 SND (remote)

Orateur: Andrey Kupich

talk_SND.pdf

15:00 Belle II

Orateur: Qingyuan Liu

20250908_BelleII_ee2pipi_qyliu.pdf

15:30 → 16:15 HVP discussion

Président de session: Achim Denig

Discussion_HVPdisp.pdf

16:15 → 16:45 Coffee break

16:45 → 18:45 Tau decays

Président de session: Kim Maltman

16:45 Tau decays at Belle II and super tau-charm factory

Orateur: Changzheng Yuan

Yuan_tau_to_pipi_BelleII.pdf

17:15 Recent DMZ update

Orateur: Zhiqing Zhang (IJCLab)

tau-DMZ-250908.pdf

17:45 Bern group update

Orateur: Simon Holz

simon_holz_tauIB_bernupdate.pdf

18:15 RBC/UKQCD update

Orateur: Mattia Bruno

orsay25_bruno.pdf

18:45 → 19:04 Posters

18:45 Measurement of the transition form factor of the f_1(1285) in a partial wave analysis of gamma*gamma -> f_1(1285) at BESIII

Orateur: Jan Muskalla

Poster_Muskalla.pdf

18:46 A model for light tensor meson transition form factors

Orateur: Eirini Lymperiadou

MSc_posterFinal.pdf

18:47 Combination of 2pi and 4pi spectra from tau decays and application in a^HVP_mu

Orateur: Lucas Mansur

LMM_g2Workshop_2025.PDF

18:48 Scattering Amplitudes for massless QED processes at N^3LO using tensor decomposition

Orateur: Thomas Dave

Theory Initiative Poster- Thomas Dave.pdf

18:49 The pion vector form factor with inelasticities

Orateur: Leon Heuser

CoupledChannelVFF_LeonHeuser.pdf

18:50 The Muon Magnetic Moment and Physics Beyond the Standard Model

Orateur: Kilian Möhling

poster-Moehling.pdf

18:51 Error Scaling of Sea Quark Isospin-Breaking Effects

Orateur: Alessandro Cotellucci

Poster_Cotellucci.pdf

18:52 Description of three-body decays using Khuri-Treiman formalism

Orateur: Miriam Penners

Poster_Penners.pdf

18:53 The dependence of amu^HVP on the muon mass and how we can use it to reduce noise in lattice computation

Orateur: Leo Filipovic

Poster_Muonmassfits_final.pdf

18:54 Improved pseudoscalar transition form factors in Resonance Chiral Theory and their g – 2 contributions

Orateur: Emilio Estrada

P-TFF in Resonance Chiral Theory.pdf

19:00 → 20:30 Reception (cocktail dinner)

mar. 9 septembre

09:00 → 09:30 Tau decays

Président de session: Kim Maltman

09:00 FSR and rho-width IB corrections beyond scalar QED and their impact on muon g-2

Orateur: Genaro Toledo

Toledo_widthdiff.pdf

09:30 → 10:00 Tau IB corrections discussion

Président de session: Maarten Golterman

IB-discussion.pdf

10:00 → 10:30 Coffee break

10:30 → 12:20 MC, radiative corrections

Président de session: Fedor Ignatov

10:30 Dispersive analysis of the isospin-breaking corrections to pipi scattering and pion vector form factor

Orateur: Martina Cottini

pipi_MCottini.pdf

10:50 RadioMonteCarLow 2 overview

Orateur: Marco Rocco

mr-ti8.pdf

11:20 McMule update

Orateur: Sophie Kollatzsch

kollatzsch-8TI.pdf

11:40 Babayaga@NLO

Orateur: Fulvio Piccinini

piccinini.pdf

12:00 Fast evaluation of Feynman integrals for Monte Carlo generators

Orateur: Pau Petit Rosas

PhokharaTheoryInititative.pdf

12:20 → 13:00 MC generators and radiative corrections discussion

Président de session: Yannick Ulrich

MC discussion.pdf

13:00 → 14:30 lunch (Building (Bât.) 230)

14:30 → 17:10 Disp HVP

Président de session: Bastian Kubis

14:30 DHMZ

Orateur: Bogdan MALAESCU (LPNHE, IN2P3, CNRS)

amuHVP_Malaescu.pdf

15:00 KNTW

Orateur: Aidan Wright

A_Wright_Muon_g_2_Theory_Initiative_2025_Presentation_Opt_1 (12).pdf

15:30 Dispersive approach

Orateur: Thomas Leplumey

vff_orsay_2509.pdf

16:00 Coffee break

16:30 pQCD inclusive (remote)

Orateur: Diogo Boito

Boito-Ruds-pQCD-g-2-TI-Orsay.pdf

16:50 The pion vector form factor with explicit inelasticities

Orateur: George Chanturia

Pion_VFF_with_explicit_inelasticities.pdf

17:10 → 17:40 Disp HVP discussion

Président de session: Gilberto Colangelo

Orsay25-HVP-discussion.pdf

mer. 10 septembre

09:00 → 10:15 Lattice HVP: part 1

Président de session: Letizia Parato

09:00 BMW

Orateur: Finn Stokes

finnstokes-bmw-gm2ti2025.pdf

09:30 ETM

Orateur: Antonio Evangelista

talkOrsay_AE.pdf

10:00 Aubin et al.

Orateur: Maarten Golterman

taste-breaking.pdf

10:15 → 10:45 Coffee break

10:45 → 12:55 Lattice HVP: part 2

Président de session: Davide Giusti

10:45 FNAL/HPQCD/MILC

Orateur: Jacob Sitison

Sitison_HVP_from_Fermilab_HPQCD_MILC.pdf

11:25 Mainz

Orateurs: Alessandro Conigli, Simon Kuberski

25orsay_mainz_hvp.pdf

11:55 RBC/UKQCD

Orateurs: Christoph Lehner, Julian Parrino

RBC_UKQCD_HVP_Talk_Parrino.pdf

12:25 RC*

Orateur: Paola Tavella

G_2_talk_25.pdf

13:00 → 14:30 Lunch (Building (Bât.) 230)

13:00 → 14:30 SC members meeting

Président de session: Aida El-Khadra

14:30 → 16:00 Lattice HVP discussion

Présidents de session: Marina Marinkovic, Steven Gottlieb

14:30 EM corrections to HVP: lattice QCD vs. data-driven evaluations

Orateur: Volodymyr Biloshytskyi

Biloshytskyi_Orsay2.pdf

14:45 IB with CCS

Orateur: Dominik Erb

IB_with_CCS_Erb.pdf

14:55 LD QED (RBC)

Orateurs: Christoph Lehner, Julian Parrino

qed-ld.pdf

15:05 Discussion

Orateurs: Marina Krstic Marinkovic (ETH Zurich), Steven Gottlieb (Indiana University)

WednesdayLatticeHVPdisc_v2.pdf

16:00 → 16:30 Coffee break

16:30 → 17:10 Connections

Président de session: Carleton DeTar

16:30 R-ratio (ChiQCD)

Orateur: Jian Liang

R_and_HVP_2509.pdf

16:55 NLO HVP (Mainz)

Orateur: Arnau Beltran

NLOHVP_Mainz.pdf

jeu. 11 septembre

09:00 → 10:20 Lattice HLbL

Président de session: Urs Wenger

09:00 RBC/UKQCD

Orateur: Thomas Blum

talk.pdf

09:25 ETM

Orateur: Simone Romiti

Romiti-Orsay.pdf

09:50 BMW

Orateur: Antoine Gérardin

Orsay1.pdf

10:10 Sign of the disconnected contribution to the pion TFF : Mainz update

Orateur: Antoine Gérardin

Orsay2.pdf

10:20 → 10:40 Lattice HLbL discussion

Président de session: Christoph Lehner

hlbl-questions.pdf

10:40 → 11:10 Coffee break

11:10 → 12:30 Experimental inputs HLbL

Président de session: Johan Bijnens

11:10 BESIII

Orateur: Christoph Redmer

CFR250911.pdf

11:40 Belle II plan

Orateur: Hisaki Hayashii

piTFF.-g-2WS-Orsay-250910.pdf

12:10 New high-precision transition form factor measurement of the pi0 at A2/MAMI

Orateur: Achim Denig

Muon_g-2_TheoryInitiative_Denig_pdf.pdf

12:30 → 15:30 Disp HLbL: Part 1

Président de session: Christoph Redmer

12:30 Dispersive approach to HLbL in four-point kinematics

Orateur: Maximilian Zillinger

orsaypresentation.pdf

13:00 Lunch

14:30 Dispersive approach in triangle kinematics

Orateur: Emilis Kaziukenas

Triangle_Paris_SEP2025.pdf

15:00 Update on hQCD

Orateur: Jonas Mager

Orsay2025_JonasMager.pdf

15:30 → 16:00 Coffee break

18:00 → 20:00 Short visit to Museum d'Orsay in Paris

Make sure to be 30' in advance for entering the museum. The first group slots at 18:00, the last one at 18:15.

20:00 → 22:00 Dinner in Museum d'Orsay

ven. 12 septembre

09:30 → 10:30 Disp HLbL: Part 2

Président de session: Anton Rebhan

09:30 Short-distance constraints

Orateur: Johan Bijnens

paris25.pdf

09:45 S-wave rescattering + two-photon MC

Orateur: Igor Danilkin (Johannes Gutenberg University of Mainz)

Danilkin2025_Orsay.pdf

10:10 Tensor/axials

Orateur: Hannah Schäfer

HannahSchaefer_SlidesOrsay.pdf

10:30 → 11:00 Coffee break

11:00 → 12:30 Disp HLbL discussion

Président de session: Peter Stoffer

11:00 Tensor meson pole contributions

Orateur: Emilio Estrada

Tensor Meson Pole Contributions within RchiT.pdf

11:15 Update on HLbL in soft kinematics

Orateur: Jan-Niklas Toelstede

SoftKinematicsUpdate.pdf

11:25 Discussions (tensor TTFs, towards more detailed comparison of lattice and data-driven evaluation; HLbL lattice overflow)

Discussion-HLbL.pdf

12:30 → 13:00 MUonE

Président de session: Peter Stoffer

12:30 MUonE

Orateur: Riccardo Pilato

MUonE_TheoryInitiative25_RP.pdf

13:00 → 14:30 Lunch (Building (Bât.) 230)

14:30 → 16:00 Future plans: the next steps for the Theory Initiative

Orateur: Aida El-Khadra

Final_Day_Orsay2025.pdf

16:00 → 16:20 Coffee