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

Sep 8, 2025, 8:30 AM → Sep 12, 2025, 5:00 PM 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

Mon, September 8

8:30 AM → 9:20 AM Registration with coffee

9:20 AM → 9:30 AM Welcome speech by director Achille Stocchi & introduction (slides) from organizers

Informations.pdf

9:30 AM → 10:30 AM g-2 measurements

Convener: Thomas Teubner

9:30 AM Fermilab final result

Speaker: Alberto Lusiani

alusiani-gm2ti-orsay-sep25.pdf

10:00 AM Experiment update J-PARC

Speaker: Tsutomu Mibe

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

10:30 AM → 11:00 AM Coffee break

11:00 AM → 3:30 PM Experimental inputs HVP

Convener: Toru Iijma

11:00 AM CMD2/3 (remote)

Speaker: Evgeny Solodov

Solodov_CMD_TI_2025_09.pdf

11:30 AM BABAR new pipi measurement

Speaker: Andres Pinto (LPNHE - CNRS)

g_2_workshop_AP.pdf

12:00 PM KLOE

Speaker: Lorenzo Cotrozzi

Cotrozzi_KLOE_8g-2TI.pdf

12:30 PM BESIII

Speaker: Weiping Wang

Muon_g-2_Orsay_wangwp_20250908.pdf

1:00 PM Lunch

2:30 PM SND (remote)

Speaker: Andrey Kupich

talk_SND.pdf

3:00 PM Belle II

Speaker: Qingyuan Liu

20250908_BelleII_ee2pipi_qyliu.pdf

3:30 PM → 4:15 PM HVP discussion

Convener: Achim Denig

Discussion_HVPdisp.pdf

4:15 PM → 4:45 PM Coffee break

4:45 PM → 6:45 PM Tau decays

Convener: Kim Maltman

4:45 PM Tau decays at Belle II and super tau-charm factory

Speaker: Changzheng Yuan

Yuan_tau_to_pipi_BelleII.pdf

5:15 PM Recent DMZ update

Speaker: Zhiqing Zhang (IJCLab)

tau-DMZ-250908.pdf

5:45 PM Bern group update

Speaker: Simon Holz

simon_holz_tauIB_bernupdate.pdf

6:15 PM RBC/UKQCD update

Speaker: Mattia Bruno

orsay25_bruno.pdf

6:45 PM → 7:04 PM Posters

6:45 PM Measurement of the transition form factor of the f_1(1285) in a partial wave analysis of gamma*gamma -> f_1(1285) at BESIII

Speaker: Jan Muskalla

Poster_Muskalla.pdf

6:46 PM A model for light tensor meson transition form factors

Speaker: Eirini Lymperiadou

MSc_posterFinal.pdf

6:47 PM Combination of 2pi and 4pi spectra from tau decays and application in a^HVP_mu

Speaker: Lucas Mansur

LMM_g2Workshop_2025.PDF

6:48 PM Scattering Amplitudes for massless QED processes at N^3LO using tensor decomposition

Speaker: Thomas Dave

Theory Initiative Poster- Thomas Dave.pdf

6:49 PM The pion vector form factor with inelasticities

Speaker: Leon Heuser

CoupledChannelVFF_LeonHeuser.pdf

6:50 PM The Muon Magnetic Moment and Physics Beyond the Standard Model

Speaker: Kilian Möhling

poster-Moehling.pdf

6:51 PM Error Scaling of Sea Quark Isospin-Breaking Effects

Speaker: Alessandro Cotellucci

Poster_Cotellucci.pdf

6:52 PM Description of three-body decays using Khuri-Treiman formalism

Speaker: Miriam Penners

Poster_Penners.pdf

6:53 PM The dependence of amu^HVP on the muon mass and how we can use it to reduce noise in lattice computation

Speaker: Leo Filipovic

Poster_Muonmassfits_final.pdf

6:54 PM Improved pseudoscalar transition form factors in Resonance Chiral Theory and their g – 2 contributions

Speaker: Emilio Estrada

P-TFF in Resonance Chiral Theory.pdf

7:00 PM → 8:30 PM Reception (cocktail dinner)

Tue, September 9

9:00 AM → 9:30 AM Tau decays

Convener: Kim Maltman

9:00 AM FSR and rho-width IB corrections beyond scalar QED and their impact on muon g-2

Speaker: Genaro Toledo

Toledo_widthdiff.pdf

9:30 AM → 10:00 AM Tau IB corrections discussion

Convener: Maarten Golterman

IB-discussion.pdf

10:00 AM → 10:30 AM Coffee break

10:30 AM → 12:20 PM MC, radiative corrections

Convener: Fedor Ignatov

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

Speaker: Martina Cottini

pipi_MCottini.pdf

10:50 AM RadioMonteCarLow 2 overview

Speaker: Marco Rocco

mr-ti8.pdf

11:20 AM McMule update

Speaker: Sophie Kollatzsch

kollatzsch-8TI.pdf

11:40 AM Babayaga@NLO

Speaker: Fulvio Piccinini

piccinini.pdf

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

Speaker: Pau Petit Rosas

PhokharaTheoryInititative.pdf

12:20 PM → 1:00 PM MC generators and radiative corrections discussion

Convener: Yannick Ulrich

MC discussion.pdf

1:00 PM → 2:30 PM lunch (Building (Bât.) 230)

2:30 PM → 5:10 PM Disp HVP

Convener: Bastian Kubis

2:30 PM DHMZ

Speaker: Bogdan MALAESCU (LPNHE, IN2P3, CNRS)

amuHVP_Malaescu.pdf

3:00 PM KNTW

Speaker: Aidan Wright

A_Wright_Muon_g_2_Theory_Initiative_2025_Presentation_Opt_1 (12).pdf

3:30 PM Dispersive approach

Speaker: Thomas Leplumey

vff_orsay_2509.pdf

4:00 PM Coffee break

4:30 PM pQCD inclusive (remote)

Speaker: Diogo Boito

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

4:50 PM The pion vector form factor with explicit inelasticities

Speaker: George Chanturia

Pion_VFF_with_explicit_inelasticities.pdf

5:10 PM → 5:40 PM Disp HVP discussion

Convener: Gilberto Colangelo

Orsay25-HVP-discussion.pdf

Wed, September 10

9:00 AM → 10:15 AM Lattice HVP: part 1

Convener: Letizia Parato

9:00 AM BMW

Speaker: Finn Stokes

finnstokes-bmw-gm2ti2025.pdf

9:30 AM ETM

Speaker: Antonio Evangelista

talkOrsay_AE.pdf

10:00 AM Aubin et al.

Speaker: Maarten Golterman

taste-breaking.pdf

10:15 AM → 10:45 AM Coffee break

10:45 AM → 12:55 PM Lattice HVP: part 2

Convener: Davide Giusti

10:45 AM FNAL/HPQCD/MILC

Speaker: Jacob Sitison

Sitison_HVP_from_Fermilab_HPQCD_MILC.pdf

11:25 AM Mainz

Speakers: Alessandro Conigli, Simon Kuberski

25orsay_mainz_hvp.pdf

11:55 AM RBC/UKQCD

Speakers: Christoph Lehner, Julian Parrino

RBC_UKQCD_HVP_Talk_Parrino.pdf

12:25 PM RC*

Speaker: Paola Tavella

G_2_talk_25.pdf

1:00 PM → 2:30 PM Lunch (Building (Bât.) 230)

1:00 PM → 2:30 PM SC members meeting

Convener: Aida El-Khadra

2:30 PM → 4:00 PM Lattice HVP discussion

Conveners: Marina Marinkovic, Steven Gottlieb

2:30 PM EM corrections to HVP: lattice QCD vs. data-driven evaluations

Speaker: Volodymyr Biloshytskyi

Biloshytskyi_Orsay2.pdf

2:45 PM IB with CCS

Speaker: Dominik Erb

IB_with_CCS_Erb.pdf

2:55 PM LD QED (RBC)

Speakers: Christoph Lehner, Julian Parrino

qed-ld.pdf

3:05 PM Discussion

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

WednesdayLatticeHVPdisc_v2.pdf

4:00 PM → 4:30 PM Coffee break

4:30 PM → 5:10 PM Connections

Convener: Carleton DeTar

4:30 PM R-ratio (ChiQCD)

Speaker: Jian Liang

R_and_HVP_2509.pdf

4:55 PM NLO HVP (Mainz)

Speaker: Arnau Beltran

NLOHVP_Mainz.pdf

Thu, September 11

9:00 AM → 10:20 AM Lattice HLbL

Convener: Urs Wenger

9:00 AM RBC/UKQCD

Speaker: Thomas Blum

talk.pdf

9:25 AM ETM

Speaker: Simone Romiti

Romiti-Orsay.pdf

9:50 AM BMW

Speaker: Antoine Gérardin

Orsay1.pdf

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

Speaker: Antoine Gérardin

Orsay2.pdf

10:20 AM → 10:40 AM Lattice HLbL discussion

Convener: Christoph Lehner

hlbl-questions.pdf

10:40 AM → 11:10 AM Coffee break

11:10 AM → 12:30 PM Experimental inputs HLbL

Convener: Johan Bijnens

11:10 AM BESIII

Speaker: Christoph Redmer

CFR250911.pdf

11:40 AM Belle II plan

Speaker: Hisaki Hayashii

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

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

Speaker: Achim Denig

Muon_g-2_TheoryInitiative_Denig_pdf.pdf

12:30 PM → 3:30 PM Disp HLbL: Part 1

Convener: Christoph Redmer

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

Speaker: Maximilian Zillinger

orsaypresentation.pdf

1:00 PM Lunch

2:30 PM Dispersive approach in triangle kinematics

Speaker: Emilis Kaziukenas

Triangle_Paris_SEP2025.pdf

3:00 PM Update on hQCD

Speaker: Jonas Mager

Orsay2025_JonasMager.pdf

3:30 PM → 4:00 PM Coffee break

6:00 PM → 8:00 PM 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.

8:00 PM → 10:00 PM Dinner in Museum d'Orsay

Fri, September 12

9:30 AM → 10:30 AM Disp HLbL: Part 2

Convener: Anton Rebhan

9:30 AM Short-distance constraints

Speaker: Johan Bijnens

paris25.pdf

9:45 AM S-wave rescattering + two-photon MC

Speaker: Igor Danilkin (Johannes Gutenberg University of Mainz)

Danilkin2025_Orsay.pdf

10:10 AM Tensor/axials

Speaker: Hannah Schäfer

HannahSchaefer_SlidesOrsay.pdf

10:30 AM → 11:00 AM Coffee break

11:00 AM → 12:30 PM Disp HLbL discussion

Convener: Peter Stoffer

11:00 AM Tensor meson pole contributions

Speaker: Emilio Estrada

Tensor Meson Pole Contributions within RchiT.pdf

11:15 AM Update on HLbL in soft kinematics

Speaker: Jan-Niklas Toelstede

SoftKinematicsUpdate.pdf

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

Discussion-HLbL.pdf

12:30 PM → 1:00 PM MUonE

Convener: Peter Stoffer

12:30 PM MUonE

Speaker: Riccardo Pilato

MUonE_TheoryInitiative25_RP.pdf

1:00 PM → 2:30 PM Lunch (Building (Bât.) 230)

2:30 PM → 4:00 PM Future plans: the next steps for the Theory Initiative

Speaker: Aida El-Khadra

Final_Day_Orsay2025.pdf

4:00 PM → 4:20 PM Coffee