The 15th International Workshop on Tau Lepton Physics

Vondelkerk, Amsterdam

Vondelkerk, Amsterdam

Vondelstraat 120, 1054 GS Amsterdam, The Netherlands
Cristina Galea (Nikhef National institute for subatomic physics (NL)), Olga Igonkina (Nikhef National institute for subatomic physics (NL))

This is the fifteenth workshop of TAU series on physics of the tau lepton, it’s neutrino, and related processes. The goal of the workshop is to get theorists and experimentalists together to discuss recent progress in the field. New results from high energy machines (e.g LHC experiments: ATLAS, CMS, LHCb), low energy machines (BES-III and other) and B-factories (including Belle-2) will be presented as well as recent results from g-2 and neutrino oscillation experiments. The program also includes related subjects such as hadron cross section measurement at e+e- colliders, lepton universality puzzles in meson decays, searches for Lepton Flavour Violation in τ and μ decays and review talks on the future experiments.


Format of the conference:

The program will consist of plenary talks only. Tentative schedule is from Monday lunch time till Friday lunch time. Additionally, there will be a poster session on Monday evening with posters remaining in main room for the full duration of the conference.



The conference will take place in Vondelkerk, in the center of Amsterdam


Conference fee:
The conference fee includes coffee breaks,  the welcome reception, the dinner and the social program. The fee is 225€. The online version of proceedings will be free of charge, and the printed version is 25€.  Accompanying persons are cordially invited to join the conference dinner (60€).



We are please to announce that the proceedings for Tau2018 are now available at SciPost.



Videoconference Rooms
meeting for organization of tau2018
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  • Achim Stahl
  • Adrian Signer
  • Alberto Lusiani
  • Alejandro Gutierrez Rodriguez
  • Alessandra Tonazzo
  • Alessandro Bravar
  • Amarjit Soni
  • Ami Rostomyan
  • Ana M. Teixeira
  • Andrea Pocar
  • Ann-Kathrin Perrevoort
  • Anna Driutti
  • Anne-Catherine Le Bihan
  • Antonio Pich
  • Antonio Rodríguez
  • B. Lee Roberts
  • Benedict Tobias Winter
  • Bernat Capdevila
  • Boris Shwartz
  • Boyang Li
  • Brian Le
  • Cedric Weiland
  • Charles Timmermans
  • Christoph Lehner
  • Claudio Caputo
  • Cornelis Onderwater
  • Cristina Galea
  • Daan van Eijk
  • Daniele Fargion
  • Darius Faroughy
  • Denis Epifanov
  • Diego Guadagnoli
  • Diogo Boito
  • Edwin Chow
  • Eleftheria Malami
  • Elisabetta Pallante
  • Emilie Passemar
  • Evgeny Solodov
  • Feng LYU
  • Gabriel Lopez-Castro
  • Gerardo Hernández-Tomé
  • Gilberto Tetlalmatzi-Xolocotzi
  • Giuliana Galati
  • Greg Ciezarek
  • Guangshun Huang
  • Hyunkwan Seo
  • Ivan Esteban
  • Jian Wang
  • Jianyong Zhang
  • Johann Kuehn
  • Johnathan Gutierrez
  • Kenji Inami
  • Keri Vos
  • Keti Kaadze
  • Kim Maltman
  • Klaas Padeken
  • Koichiro Shimomura
  • Kyrylo Bondarenko
  • Lara Katharina Schildgen
  • Laura Cardani
  • Luca Fiorini
  • Maarten Golterman
  • Maarten van Veghel
  • Manqi Ruan
  • Marcel Merk
  • Marcus Matthias Morgenstern
  • Maria Hernandez Ruiz
  • Marta Trini
  • Martin Gonzalez-Alonso
  • Masaharu Aoki
  • Masahiro Kuze
  • Matteo Bedognetti
  • Matteo Fael
  • Matthias Jamin
  • Mattia Bruno
  • Michel Hernandez Villanueva
  • Mogens Dam
  • Monica Salinas Ibañez
  • Natsuki Teshima
  • Nicolo De Groot
  • Olga Igonkina
  • Pablo Fernández Menéndez
  • Pablo Roig Garcés
  • Patrick Blackstone
  • Paul De Jong
  • Pavel Piminov
  • Petar Bokan
  • Richard Bonventre
  • Robert Fleischer
  • Ruben Jaarsma
  • Sean Benson
  • Sergey Serednyakov
  • Sifan Zhang
  • Simon Eidelman
  • Soham Bhattacharya
  • Somnath Choudhury
  • Stefan Sint
  • Susanne Westhoff
  • Svjetlana Fajfer
  • Taku Izubuchi
  • Terry, Wing Sheung Chan
  • Thomas Lueck
  • Toshiyuki Iwamoto
  • Tsutomu Mibe
  • Vincenzo Cirigliano
  • Vittorio Paolone
  • Vladimir Cherepanov
  • Volker Hannen
  • Wei Tang
  • William J. Marciano
  • Xin Chen
  • Yifan Jin
  • Yoshitaka Kuno
  • Yuping Guo
  • Yury Kudenko
  • Zbigniew Was
  • Zohreh Parsa
    • 12:00 13:00
    • 13:00 13:30
      Session: Welcome
      • 13:00
        Welcome 20m
        Speaker: Stan Bentvelsen (Nikhef National institute for subatomic physics (NL))
      • 13:20
        Organisation issues 10m
        Speaker: Olga Igonkina (Nikhef National institute for subatomic physics (NL))
    • 13:30 15:00
      Session: Tau properties - I
      Convener: Yuping Guo
      • 13:30
        Report from the HFLAV group 30m
        Speaker: Alberto Lusiani (INFN)
      • 14:00
        Latest Belle results on tau decays 20m

        We firstly measure the branching fraction for tau -> pi e+e- nu and pi
        mu+mu- nu. Though these decays are allowed by the standard model, they
        have never been measured because they are expected to have a small
        branching fraction. Belle's largest tau data sample makes us to expect
        to measure these decays with a high sensitivity. In this presentation,
        we show the result of measurement of branching fraction of these decays
        using Belle's full data sample. We also discuss the result with the
        hadron physics model prediction, which has been published recently.

        Speaker: Yifan Jin (The University of Tokyo)
      • 14:20
        Measurement of the branching fractions B(tau -> K npi0 nu), n=0,1,2,3, and B(tau -> pi npi0 nu), n=3,4 20m

        We report the measurements of the branching fractions of the decay B(tau -> K npi0 nu), n=0,1,2,3, and B(tau -> pi npi0 nu), n=3,4 excluding the contributions that proceed through the decay of intermediate K0 and \eta mesons. The measurements are based on a data sample of 435 million tau pairs produced in e+e- collisions at and near the Y(4s) peak and collected with the BaBar detector in 1999--2008.
        These measurements are substantial improvements of previous measurements and B(tau -> pi 4pi0 nu) is measured for the first time.

        Speaker: Thomas Lueck (University of Pisa)
      • 14:40
        Prospects for τ lepton physics at Belle II 20m

        The Belle II experiment is a substantial upgrade of the Belle detector and will operate at the SuperKEKB energy-asymmetric e+e− collider. The accelerator has already successfully completed the first phase of commissioning in 2016 and first electron positron collisions in Belle II are expected for April 2018. The design luminosity of SuperKEKB is 8×1035 cm−2s−1 and the Belle II experiment aims to record 50 ab−1 of data, a factor of 50 more than the Belle experiment. Belle II broad programme of τ physics, in particular in searches of lepton flavor and lepton number violations (LFV and LNV), benefiting from the large cross section of the pairwise τ lepton production in e+e−collisions. We expect that after 5 years of data taking, Belle II will be able to reduce the upper limits on LF and LN violating τ decays by an order of magnitude. Any experimental observation of LFV or LNV in τ decays constitutes an unambiguous sign of physics beyond the Standard Model, offering the opportunity to probe the underlying New Physics. In this talk we will review the τ lepton physics program of Belle II.

        Speaker: Michel Hernandez Villanueva (Cinvestav)
    • 15:00 15:30
      Coffee or lunch break
      • 15:00
        Coffee break 30m
    • 15:30 18:10
      Session: Tau properties - II
      Convener: Matthias Jamin
      • 15:30
        Tau mass measurement at BESIII 20m

        In order to obtain the most accurate mass of tau lepton using a limited amount of data at BESIII, we optimized the position and luminosity distribution of each energy point. Beam energy measurement system was built at BEPCII for minimizing the system error caused by energy uncertainty. About 140 pb-1 tau mass scan data was acquired in April this year, and preliminary measurement results is presented in this talk.

        Speaker: Jianyong Zhang (IHEP, CAS)
      • 15:50
        Implications of tau data for CP violation in K decays 20m

        In the chiral limit, the D = 6 contribution of the Operator Product Expansion (OPE) of the V-A correlator of quark currents only depends on two vacuum condensates, which can be related with the electroweak penguin contributions of K->pipi processes, keys for a better understanding of CP violation in kaons. We use those relations to obtain those matrix elements between hadrons using the ALEPH spectral function.

        Speaker: Antonio Rodríguez-Sánchez
      • 16:10
        The status of the inclusive tau determination of V_us 20m

        I review the current status of determinations of V_us using inclusive hadronic tau decay data, focusing on (1) recent work establishing theoretical systematic issues with the conventional determination based on flavor-breaking finite-energy sum rule analyses employing only inclusive strange and non-strange branching fractions as experimental input, (2) an alternate flavor-breaking sum rule implementation which avoids these problems, and (3) a very recent lattice-based analysis of the inclusive strange decay distribution. The latter, in particular, clearly establishes that the V_us implied by inclusive hadronic tau decay data is significantly larger than the results obtained from the conventional sum rule implementation, and, in fact, in good agreement within errors with the expectations of three-family unitarity.

        Speaker: Kim Maltman (York University)
      • 16:30
        A no-go theorem for non-standard explanations of the τ→KSπντ CP asymmetry 20m
        Speaker: Martin Hoferichter (University of Washington)
      • 16:50
        Non-standard interactions in tau- -> (pi-pi0,pi-eta)nu_tau 20m

        Being G-parity suppressed in the SM, tau to eta/eta' pi nu_tau decays can set competitive bounds on non-standard scalar charged current interactions. This question is addressed within an EFT framework, including the most general interactions between SM fields up to dimension six, assuming massless neutrinos (based on JHEP 1712 (2017) 027).

        Speaker: Gabriel Lopez Castro (Cinvestav-IPN)
      • 17:10
        New Physics bounds from Hadronic Tau decays 20m

        I'll discuss the information about New Physics that can be extracted from Hadronic Tau decays, and its interplay with other Electroweak Precision Observables and the complementarity with searches at the LHC.

        Speaker: Martin Gonzalez-Alonso (CERN)
      • 17:30
        NLO prediction for the decays τ→ℓℓ′ℓ′νν¯ and μ→eeeνν¯ 20m

        We present the differential decay rates and the branching ratios of the tau and muon decays with internal conversion, τ→ℓℓ′ℓ′νν¯ and μ→eeeνν¯, in the Standard Model at NLO in the on-shell scheme.

        These five-body leptonic decays are a tool to study the Lorentz structure of the weak interactions and to test lepton flavor universality. They are also a source of SM background for charged-lepton-flavor-violation searches of the forbidden decays μ→eee and τ→ℓℓ′ℓ′.

        Even if the shift in the branching ratios induced by radiative corrections turns out to be small and of order 1% --- mainly due to a running effect of the fine-structure constant α --- locally in the phase space these corrections can reach the 5-10 % level, depending on the applied cuts.

        We found for instance that in the phase space region where the neutrino energies are small, and the momenta of the three charged leptons have a similar signature as in the μ→eee and τ→ℓℓ′ℓ′ decays, the NLO corrections decrease the leading-order prediction by about 10-20 %.

        Speaker: Matteo Fael (University of Siegen)
      • 17:50
        BSM b->s tau+ tau- 20m
        Speaker: Bernat Capdevila (IFAE)
    • 18:10 21:25
      Reception: Reception and poster session
      • 18:36
        Limits on the anomalous magnetic and electric dipole moments of the tau-neutrino in pp collisions at the LHC 1m
        Speaker: Alejandro Gutierrez-Rodriguez (Universidad Autonoma de Zacatecas)
      • 18:37
        Sensitivity on the electromagnetic dipole moments of the τ-lepton at the CLIC 1m
        Speaker: Maria de los Angeles Hernandez-Ruiz (San Luis Potosi Aut. University)
      • 18:38
        Study of the e+e- -> pi+pi-pi0pi0pi0, pi+pi-pi0pi0eta reactions via ISR at BaBar 1m
        Speaker: Evgeny Solodov (BudkerINP)
      • 18:40
        On isospin breaking in tau input for (g-2) from Lattice QCD 1m
        Speaker: Mattia Bruno (BNL)
      • 18:43
        Search for FCNC decays of a top quark to an up-type quark and the SM Higgs boson in the di-tau final state 1m
        Speaker: Boyang Li (Tsinghua University (CN))
      • 18:45
        Measurement of the spectral function for the τ−→K−KSντ decay in Babar experiment 1m
        Speaker: Sergey Serednyakov (BINP Novosibirsk)
      • 18:46
        Search for ultra-high energy neutrinos with the Pierre Auger Observatory 1m
        Speaker: Marta Trini
      • 18:47
        Searches for lepton flavour violation in decays of the Z boson with the ATLAS detector 1m
        Speaker: Terry WS Chan (Nikhef National institute for subatomic physics (NL))
      • 18:48
        Disentangle Neutrino Astronomy by Tau signature 1m
        Speaker: Daniele Fargion (Rome University 1 Sapienza and INFN)
      • 18:49
        Higher order QCD corrections to hadronic tau decays from Padé approximants 1m
        Speaker: Diogo Boito (Universidade de São Paulo)
      • 18:50
        Tau reconstruction at CMS with a focus on high momentum taus 1m
        Speaker: Soham Bhattacharya (Tata Inst. of Fundamental Research (IN))
      • 18:52
        Study of Michel parameters in tau decays at Belle 1m
        Speaker: Denis Epifanov (BINP)
      • 18:53
        Development of the detectors for the DeeMe experiment 1m
        Speaker: Natsuki Teshima (Osaka City University)
      • 18:54
        The Rare and Forbidden: Testing Physics Beyond the Standard Model with Mu3e 1m
        Speaker: Ann-Kathrin Perrevoort (Nikhef National institute for subatomic physics (NL))
      • 18:55
        Tau->3 mu in Run-1 with the ATLAS detector 1m
        Speaker: Matteo Bedognetti (Nikhef National institute for subatomic physics (NL))
      • 18:56
        Duality Violations and Tau decay 1m
        Speaker: Santiago Peris (Univ. Autonoma de Barcelona)
      • 18:57
        Revisiting τ→3μ in the Standard Model and beyond 1m

        Recent improvements of the Large Hadron Collider luminosity and beginning of Belle II experiment will increase sensitivity to τ lepton-flavor violating modes. In particular, it has been claimed that BR(τ→3μ) could be as large as 10−14 in the standard model with Dirac neutrinos. This limit could be reached in the near future with further upgrades to the Large Hadron Collider and Belle II. In this talk we revisit this claim in light of more recent neutrino data. Further, we expand this analysis to the case of Majorana masses.

        Speaker: Patrick Blackstone (Indiana University Bloomington)
    • 08:30 10:20
      Session: Flavor puzzles
      Convener: Gregory Max Ciezarek (CERN)
      • 08:30
        Theory status 30m
        Speaker: Svjetlana Fajfer (Univ. of Ljubljana and Inst. J. Stefan)
      • 09:00
        LFU tests with semitauonic decays at LHCb 20m

        In the Standard Model, the three charged leptons are identical copies of each other, apart from mass differences. Experimental tests of this feature in semileptonic decays of b-hadrons are highly sensitive to New Physics particles which preferentially couple to the 2nd and 3rd generations of leptons. This talk will review the latest lepton universality tests in semileptonic b->c transitions at LHCb.

        Speaker: Sean Benson (Nikhef National institute for subatomic physics (NL))
      • 09:20
        Exploiting tau polarisation in B -> D* tau nu 20m
        Speaker: Susanne Westhoff (Heidelberg University)
      • 09:40
        Probing LNU with (semi)leptonic B decays 20m
        Speaker: Gilberto Tetlalmatzi-Xolocotzi (Nikhef)
      • 10:00
        LNU, LNV and LFV at Belle II 20m
        Speaker: Ami Rostomyan (DESY)
    • 10:20 10:40
      Coffee or lunch break
    • 10:40 12:40
      Session: Lepton Flavor Violation with taus and muons
      Convener: Robert Fleischer (Vrije Universiteit Amsterdam)
      • 10:40
        Leptonic LFV theory 30m
        Speaker: Adrian Signer (Durham University)
      • 11:10
        LFV and neutrino mass 30m
        Speaker: Ana M. Teixeira (LPC Clermont)
      • 11:40
        Meson LFV decays (X->e+mu) in LHCb 20m
        Speaker: Maarten Van Veghel (Nikhef National institute for subatomic physics (NL))
      • 12:00
        Test lepton flavor universality with (semi)leptonic D decays at BESIII 20m

        Using 2.93 fb−1 data taken at s√=3.773 GeV and 3.19~fb−1 data taken at s√=4.178 GeV with the BESIII detector, precision measurements of the branching fractions of D0→K−μ+νμ, D+→K¯0μ+νμ, D0→π−μ+νμ, D+→π0μ+νμ and D+s→μ+νμ are performed.
        Combining the known branching fractions of D→K¯e+νe, D→πe+νe and D+s→τ+ντ,
        we have tested the lepton flavor universality with D→K¯ℓ+νℓ, D→πℓ+νℓ and D+s→ℓ+νℓ decays.
        We have also tested lepton flavor universality in different q2ℓνℓ intervals for D→K¯ℓ+νℓ (ℓ=e or μ).
        Besides, hadronic form factor fK+(0), D+s decay constant fD+s, and quark mixing matrix element |Vcs| are also extracted with the most precise accuracies to date.

        Speaker: Sifan Zhang (Institute of High Energy Physics Chinese Academy of Sciences)
      • 12:20
        L to l(') l+ l- LFV decays in the SM with massive neutrinos 20m
        Speaker: Dr Gerardo Hernández Tomé (Cinvestav)
    • 12:40 14:00
      Coffee or lunch break
    • 14:00 15:55
      Session: Standard Model measurements with taus at the LHC
      Convener: Keti Kaadze (Kansas State University (US))
      • 14:00
        Hadronic Tau reconstruction and identification performance in ATLAS and CMS 25m

        Tau leptons play an important role in many Standard Model and Beyond the Standard Model physics processes that are being investigated at the LHC. This talk details measurements of the performance of the reconstruction and identification of hadronic tau lepton decays by the ATLAS and CMS detectors. The measurements include the performance of the identification, trigger, energy calibration and decay mode classification algorithms for reconstructed tau candidates. The performance of these algorithms is measured using the Run 2 dataset of pp collisions collected at the LHC at a centre-of-mass energy sqrt(s)=13 TeV.

        Speaker: Anne-Catherine Le Bihan (Centre National de la Recherche Scientifique (FR))
      • 14:25
        Monte Carlo, fitting, Machine Learning for Tau leptons 20m

        Over the last few years, progress in analysis of massively multidimensional distribution was achieved for the broad range of applications in Industry, Science and in particular in domain of High Energy physics. In the talk use of such techniques for Higgs boson parity measurement using its cascade decay into tau leptons and later into 3pi decay modes will be used as an example. The use of weighted event samples was very practical and helped to establish distance between events important for the ML applications.

        Convenient for that purpose properties of the Tauola Monte Carlo will be presented. The new version feature interface between Monte Carlo library and hadronic currents to be prepared by phenomenologists and/or experimental physicists at the time of data analysis.

        The flexibility in that respect of Monte Carlo programs and of the fitting programs, is of importance as precision of tau decay measurements is usually higher than that of the predictions obtained from theoretical considerations of intermediate energy strong interactions. Good technical arrangements can be helpful for the future studies.

        Speaker: Zbigniew Andrzej Was (Polish Academy of Sciences (PL))
      • 14:45
        Tau polarization measurement in Z->tautau at LHC 20m

        Parity violation in decays of Z bosons leads to tau lepton polarisation. The measurement of the polarisation offers a unique possibility to measure tau lepton couplings and to translate them into a measurement of the effective electroweak mixing angle. Data taken by the CMS experiment are used to perform a measurement of the tau lepton polarisation in the most promising hadronic decay modes. The analysis is based on decay-mode-specific optimal observables discriminating between the two possible longitudinal spin states of tau leptons. The resulting average tau polarisation offers the possibility to estimate the effective electroweak mixing angle taking into account the variation of the polarisation as a function of sqrt(s) and the impact of different quark flavours.


        Speaker: Benedict Tobias Winter (Albert Ludwigs Universitaet Freiburg (DE))
      • 15:05
        Measurements of Higgs boson decays to leptons with the ATLAS detector 25m

        The Higgs boson decays to di-leptons has been studied by the ATLAS Collaboration using pp collisions at the LHC. Recent results on the H-> tau tau final state based on 36fb-1 of data collected at 13 TeV will be shown. In addition searches for the Lepton Flavour Violating Higgs boson decays and for the H-> mu mu final state will also be reported.

        Speaker: Lara Katharina Schildgen (University of Bonn (DE))
      • 15:30
        Measurements of Higgs properties with the H->tautau decay at CMS 25m

        The latest results on the Higgs boson decaying into a tau pair using data from the CMS experiment are reported. The talk will include the observation of the Higgs boson into a tau pair decays with the Run 2 and Run 1 data, and the more recent analyses targeting the VH and ttH production modes. The decay channel into taus allows also constraining the CP properties of the Higgs boson and first results are presented.

        Speaker: Somnath Choudhury (Indian Institute of Science (IN))
    • 15:55 16:15
      Coffee or lunch break
    • 16:20 18:45
      Session: Beyond Standard Model measurements with taus at LHC - I
      Convener: Luca Fiorini (Univ. of Valencia and CSIC (ES))
      • 16:20
        Higgs LFV involving taus (theory) 20m
        Speaker: Cedric Weiland (IPPP Durham)
      • 16:40
        Search for lepton flavour violation with the ATLAS detector 20m

        Lepton flavor violation (LVF) is a striking signature of potential beyond the Standard Model physics. The search for LFV with the ATLAS detector is reported in searches focusing on the decay of the Higgs boson, the Z boson and of a heavy neutral gauge boson, Z', using pp collisions data with a center of mass energy of 8 TeV and 13 TeV.

        Speaker: Brian Le (University of Melbourne (AU))
      • 17:00
        Search for lepton flavour violation with the CMS detector 20m

        The experimental observation of neutrino oscillations proves that neutrinos have mass and Lepton Flavour is not conserved in the neutral sector. This implies that Lepton Flavour non-conservation occurs also in the charged sector through neutrino loops, which, however, are extremely suppressed, well beyond the foreseeable experimental reach. On the other hand, several Beyond the Standard Model scenarios predict charged LFV processes, such as tau->3mu, to have branching fractions at the level of 10^{-10} - 10^{8}, which can be achieved by the current experiment in the near or medium term. We present the search for the LFV tau->3mu decay using tau leptons from B and D mesons, as well as from W bosons, based on the 2016 CMS pp dataset, corresponding to an integrated luminosity of 33.1/fb.

        Speaker: Jian Wang (University of Florida (US))
      • 17:20
        LHC searches motivated by recent B-anomalies 20m
        Speaker: Darius Faroughy (Jozef Stefan Institute)
      • 17:40
        Leptoquark searches and high mass phenomena with taus at CMS 20m

        Several searches for new particles with taus are presented. Leptoquarks that couple strongly to the third generation may explain long-standing anomalies observed in B physics. Searches for both singly and doubly produced leptoquarks have been carried out with LHC run 2 data. In addition, searches for scalar partners of the tau, as predicted in supersymmetric models, for new gauge bosons (W' to tau nu, Z' to tau tau), for additional Higgs bosons, and for other phenomena with taus in the final state are discussed.

        Speaker: Klaas Padeken (Vanderbilt University (US))
      • 18:00
        Searches for new phenomena with tau leptons in the final state using the ATLAS detector 20m

        Many theories beyond the Standard Model predict new phenomena which decay to well isolated, high-pT tau leptons. Searches for new physics models with these signatures are performed using the ATLAS experiment at the LHC. The results reported here use the pp collision data sample collected in 2015 and 2016 by the ATLAS detector at the LHC with a centre-of-mass energy of 13 TeV.

        Speaker: Masahiro Kuze (Tokyo Institute of Technology (JP))
      • 18:20
        New physics opportunities in the tau sector 25m
        Speaker: AMARJIT Soni (BNL)
    • 08:30 09:30
      Session: Beyond Standard Model measurements at the LHC - II
      Convener: Cristina Galea (Nikhef National institute for subatomic physics (NL))
      • 08:30
        Di-Higgs searches in final states with tau leptons at the LHC 20m

        Di-Higgs final states can arise through non-resonant production of two Higgs
        bosons and through potential heavy states decaying to two Higgs boson. This
        talk presents searches for di-Higgs decays in final states containing two tau
        leptons and two b-quarks at the ATLAS and CMS experiments using 13 TeV
        collision data from the LHC.

        Speaker: Petar Bokan (Uppsala University (SE), Georg-August-Universitaet Goettingen (DE))
      • 08:50
        Searches for additional Higgs bosons decaying to tau leptons at the LHC 20m

        The searches for additional Higgs bosons decaying to tau leptons in scenarios beyond the standard model will be summarised, from the pp collision data collected by the ATLAS and CMS experiments at LHC Run-2.

        Speaker: Claudio Caputo (Universite Catholique de Louvain (UCL) (BE))
      • 09:10
        SUSY searches with taus at the LHC 20m

        The supersymmetric partner of the tau lepton, the stau, is predicted to be relatively light in a range of SUSY models, and may be a key for dark matter.
        This talk presents recent CMS and ATLAS results from searches for chargino and neutralino mediated stau, and direct stau pair production.

        Speaker: Feng Lyu (Chinese Academy of Sciences (CN))
    • 09:30 09:50
      Coffee or lunch break
    • 09:50 12:15
      Session: Neutrino - I
      Convener: Vittorio Paolone (University of Pittsburgh)
      • 09:50
        Neutrinoless Double Beta Decay Overview 30m
        Speaker: Laura Cardani (INFN - National Institute for Nuclear Physics)
      • 10:20
        Neutrinoless Double Beta Decay - Theory and Connection to Tau 30m
        Speaker: Vincenzo Cirigliano (Los Alamos National Laboratory)
      • 10:50
        Solar Neutrino Physics with Borexino 20m

        Borexino is a large solar neutrino detector running at the Laboratori Nazionali del Gran Sasso since 2007. Neutrinos are detected via their interaction with a 300-ton liquid scintillator target, purified to achieve unprecedented levels of radio-purity. Borexino has detected most of the expected solar neutrino spectrum, as well as anti-neutrinos from Earth’s radioactivity and from nuclear reactors with a baseline of ~1,000 km. Recently, neutrinos from the entire pp fusion chain in the Sun have been measured with refined precision using analysis tools that fully exploit our understanding of the detector. Among these, the Beryllium-7 neutrinos are now measured with ~3% precision, which contributes to refining solar models and helps address the solar metallicity problem. These recent results will be presented along with an update on ongoing efforts to measure the last missing tile in the solar neutrino puzzle: CNO neutrinos.

        Speaker: Andrea Pocar (University of Massachusetts, Amherst)
      • 11:10
        KATRIN First Tritium 20m
        Speaker: Volker Hannen (University of Münster)
      • 11:30
        Sterile neutrinos (including SBND program) 25m
        Speaker: Ivan Esteban
      • 11:55
        Recent Results from MicroBooNE 20m

        MicroBooNE is a 85-ton active mass Liquid Argon Time Projection Chamber (LArTPC) which has been collecting data since 2015 from the Booster Neutrino Beam at Fermilab. LArTPCs are imaging detectors that record neutrino interactions with strong spatial resolution and are among the favored technology for the next generation of neutrino experiments. The main goal of MicroBooNE is to investigate the excess of nu-e-like events at low energy observed by the MiniBooNE experiment. It also has a program of precision measurements of neutrino cross sections on argon, as well as providing important LArTPC R&D for future detectors. In this talk, I will present recent results from MicroBooNE on the detector technology, event reconstruction techniques as well as from neutrino beam data.

        Speaker: Wei Tang (University of Tennessee)
    • 12:15 13:30
      Coffee or lunch break
    • 13:30 15:00
      Session: Neutrino - II
      Convener: Paul De Jong (Nikhef National institute for subatomic physics (NL))
      • 13:30
        Recent results from reactor antineutrino experiments 20m

        The smallest neutrino mixing angle θ_13 has been successfully measured by the disappearance of reactor antineutrinos at RENO, Daya Bay, and Double Chooz. The oscillation frequency is also measured based on energy and baseline dependent disappearance probability of reactor antineutrinos. Recent results find a variation in the observed reactor antineutrino flux as a function of the reactor fuel evolution. In this talk, we present more precisely measured values of θ_13 and dm^2_ee and results on the evolution of observed reactor antineutrino yields.

        Speaker: Hyunkwan Seo
      • 13:50
        Final results of the OPERA experiment on nu-tau appearance in the CNGS neutrino beam 20m

        The OPERA experiment at the Gran Sasso Laboratory was designed to study nu_mu → nu_tau oscillations in appearance mode in the CERN-to-Gran Sasso neutrino beam. We report the final analysis of the full data sample based on looser selection criteria than in previous analyses, and multivariate approach. Oscillation parameters have been determined with a reduced statistical uncertainty, and the discovery of tau neutrino appearance is confirmed with an improved significance level. The measurement of nu_tau CC cross-section was performed, and the direct observation of the nu_tau- lepton number is also reported.

        Speaker: Giuliana Galati (Universita e sezione INFN di Napoli (IT))
      • 14:10
        Beams T2K, NOvA and resulting picture 25m
        Speaker: Pablo Fernandez Menendez (Univ. of Valencia and CSIC (ES))
      • 14:35
        Cosmic neutrinos: IC, KM3NeT, ANTARES, AUGER 20m
        Speaker: Daan van Eijk (WIPAC)
    • 15:00 18:00
      Social program: museum excursion
    • 08:30 10:05
      Session: g-2 theory
      Convener: Mattia Bruno (BNL)
    • 10:05 10:30
      Coffee or lunch break
    • 10:30 13:00
      Session: g-2 experiments
      Convener: Charles Timmermans
      • 10:30
        Historical Overview 30m
        Speaker: Bradley Lee Roberts (Boston University)
      • 11:00
        E989 @ FNAL 20m
        Speaker: Anna Driutti
      • 11:20
        E34 @ KEK 20m
        Speaker: Tsutomu Mibe
      • 11:40
        Auxiliary measurements, esp. mumu/mup in Muonium; MuSEUM experiment 20m
        Speaker: Shimomura
      • 12:00
        Search for the Electric Dipole Moment and anomalous magnetic moment of the tau lepton at tau factories 20m

        Precise measurement of the Electric Dipole Moment (EDM) and anomalous magnetic moment (g-2) of particles is an important test of Beyond Standard Model (BSM) physics. It is generally believed that the tau lepton couples more strongly to BSM due to its large mass, and can be searched for at collider experiments. A new method to approximately reconstruct the neutrinos from the hadronic decays of τ−τ+ pairs produced at e−e+ tau factories is proposed. With a matrix element technique, and the estimated 50 ab−1 of data to be delivered by the Belle-II experiment, a tau EDM search with a 1-σ level precision of |dτ|<2.09×10−19 e⋅cm, and g-2 search with |Δaτ|<1.80×10−5 (1.5% of the SM prediction), can be expected. The new precisions can put an upper bound on the heavy mirror neutrino mass, which is complimentary to the direct search at hadron colliders, or a light scalar with mass at O(1 GeV), which can explain the current muon g-2 anomaly as well. The method in this work offers a new opportunity to search for BSM in current and future tau factories with high precision.

        Speaker: Xin Chen (Tsinghua University (CN))
      • 12:20
        Experimental input from e+e- machines to hadronic contribution to muon (g-2) 20m

        The VEPP-2000 e+e− collider has been operating at BINP (Novosibirsk) from 2010 in the center-of-mass energy range from 0.3 to 2 GeV. The project luminosity of this machine, exploiting the idea of the round beams, has to amount to 1032cm−2s−1. In 2017 experiments at VEPP-2000 were renewed after three year shutdown taken for new intensive positron injection source implementation as well as for upgrade of 1 GeV booster. After this upgrade the luminosity up to 5×1032cm−2s−1 was achieved. Two detectors, CMD-3 and SND, are running at two interaction regions of the VEPP-2000. Each detector collected about 120 pb-1 in the new run. Considerable statistics was taken within an energy range around the nucleon-antinucleon pair production.
        Precise study of the hadrons production in e+e− annihilation at low energies provides important information about interactions of light quarks and spectroscopy of their bound states.
        Precise measurements of the total hadronic cross section, characterized by the ratio R, is vitally needed for the calculation of the contribution of the hadronic vacuum polarization to the muon anomalous magnetic moment. It should be noted that at present the accuracy of the theoretical calculations of the muon (g-2) via the Standard Model is dominated by the precision of the hadronic contribution while the difference of theoretical and experimental values exceeds three standard deviations.
        In this report we will discuss current status and results obtained by the of the CMD-3 experiment.

        Speaker: Boris Shwartz (Budker Institute of Nuclear Physics, Novosibirsk)
      • 12:40
        e+e- for g-2 light-by-light 20m
        Speaker: Yuping Guo
    • 13:00 14:30
      Coffee or lunch break
    • 14:30 15:30
      Session: QCD
      Convener: Elisabetta Pallante
      • 14:30
        Alpha_s from lattice 20m
        Speaker: Stefan Sint (Trinity College Dublin (IE))
      • 14:50
        The strong coupling from e+e−→ hadrons 20m

        We use a new compilation of the hadronic R-ratio from available data for the process e+e−→ hadrons below the charm mass to determine the strong coupling αs, using finite-energy sum rules. Quoting our results at the τ mass to facilitate comparison to the results obtained from similar analyses of hadronic τ-decay data, we find αs(m2τ)=0.298±0.016±0.006 in fixed-order perturbation theory, and αs(m2τ)=0.304±0.018±0.006 in contour-improved perturbation theory, where the first error is statistical, and the second error combines various systematic effects. These values are in good agreement with a recent determination from the OPAL and ALEPH data for hadronic τ decays.

        Speaker: Maarten Golterman (San Francisco State University)
      • 15:10
        Alpha_s from tau data 20m
        Speaker: Antonio Pich (IFIC, U. Valencia -.)
    • 15:30 16:00
      Coffee or lunch break: Conference picture
    • 16:00 18:00
      Session: Muon experiments
      Convener: Nicolo De Groot (Department of Experimental High Energy Physics)
      • 16:00
        General features of LFV experiments with muons 30m
        Speaker: Yoshitaka Kuno (Osaka University)
      • 16:30
        The Mu3e Experiment at PSI 20m

        Lepton Flavor Violation (LFV) is strongly suppressed in the Standard Model, whilst several models based on {\it new physics} predict observable effects accessible to the new generation of experiments. Mu3e will search for the LFV neutrinoless muon decay μ+→e+e−e+ with a sensitivity down to 10−16 (at 90\% C.L.) using the world most intense continuous muon beam at the Paul Scherrer Institute.

        The search for the μ+→e+e−e+ decay requires a large acceptance detector capable of coping with rates of up to 2×109 stopped muons per second with excellent momentum, spacial, and time resolution. The Mu3e detectoris based on thin monolithic active silicon pixel sensors (HV-MAPS) for precise tracking in conjunction with scintillating fibers and tiles coupled to Si-PMs arrays for very precise timing measurements. After an intense R\&D phase, the Mu3e apparatus is under constructions. First data is expected in 2020.

        Speaker: Alessandro Bravar (Universite de Geneve (CH))
      • 16:50
        Searching for Muon to electron conversion : The Mu2e experiment at Fermilab 20m

        The Mu2e experiment will measure the charged-lepton flavor violating (CLFV) neutrino-less conversion of a negative muon into an electron in the field of a nucleus. Mu2e will improve the previous measurement by four orders of magnitude, reaching a SES (single event sensitivity) of 3×10−17 on the conversion rate. The experiment will reach mass scales of nearly 104 TeV, far beyond the direct reach of colliders. The experiment is sensitive to a wide range of new physics, complementing and extending other CLFV searches.

        Mu2e is under design and construction at the Muon Campus of Fermilab; we expect to start taking physics data in 2022 with 3 years of running to achieve our target sensitivity. We will present the physics motivation for Mu2e, the detector design, and the current experimental status.

        Speaker: Richard Bonventre (Lawrence Berkeley National Laboratory)
      • 17:10
        mu-e conversion experiments in J-PARC 20m
        Speaker: Natsuki Teshima (Osaka City University)
      • 17:30
        MEG final results and progress towards MEG-II 20m
        Speaker: Toshiyuki Iwamoto
    • 19:00 22:00
    • 08:30 10:00
      Session: Future detectors - I
      Convener: Kenji Inami (Nagoya university)
      • 08:30
        Tau physics at the High Luminosity LHC 20m
        Speaker: Emilie Passemar (Indiana University/JLab)
      • 08:50
        Tau physics at CEPC/ILC 20m
        Speaker: Manqi Ruan (Chinese Academy of Sciences (CN))
      • 09:10
        Tau physics at FCC 20m
        Speaker: Mogens Dam (University of Copenhagen (DK))
      • 09:30
        GRAND: A Giant Radio Array for Neutrino Detection 20m

        Precise detection of cosmogenic ultra-high-energy (UHE) neutrinos, with energy in excess of 108 GeV, will confirm the photo-dissociation of UHE cosmic rays and the identification of the sources of UHE neutrinos will directly point to sources of UHE cosmic rays.

        GRAND will look for ντs interacting in rock, thereby creating an UHE τ lepton, which can escape from the rock.The τ decay products will create an air shower that can be detected.

        As the flux of these UHE neutrinos is expected to be low, GRAND requires a huge exposure, which is only possible with a cheap and reliable detection method. Our air shower detection is based on the recently proven radio technology. In several steps of development we expect to be able to instrument up to 200,000 km2 for about 150 M euro.

        Except for a guaranteed detection of UHE neutrinos, GRAND will be able to investigate many other science topics, including neutrino physics, UHE gamma-ray detection, UHE cosmic ray astronomy and physics with very large statistics, the detection of fast radio bursts and giant radio pulses, and a measurement of the epoch of reionisation.

        The R&D and different initial phases of development of GRAND, as well as the physics reach for these research topics will be discussed.

        Speaker: Charles Timmermans
    • 10:00 10:20
      Coffee or lunch break
    • 10:20 11:40
      Session: Future detectors - II
      Convener: Marcus Matthias Morgenstern (Nikhef National institute for subatomic physics (NL))
      • 10:20
        Status of the DUNE Experiment 20m

        The Deep Underground Neutrino Experiment (DUNE) provides a rich science program with the focus on the neutrino oscillation physics, proton decay studies and Supernova explosions. The high-intensity wide-band neutrino beam will be produced at Fermilab and will be directed to the 40 kt Liquid Argon far detector at the Sanford Underground Research Facility (SURF), 1300 km from Fermilab. One of the most important goals of the experiment is to determine the neutrino mass ordering and the measurement of the CP violating phase. The underground location of the large DUNE far detector and its excellent energy and spatial resolution will allow also conducting non-accelerator physics programs predicted by GUT models, such as nucleon decay or n-nbar oscillations. Moreover, it will be sensitive to measure of the electron neutrino flux from a core-collapse supernova providing valuable information on the mechanism of a supernova. This ambitious project involves worldwide contribution and extensive prototyping and testing program to guarantee that all parts of the technology are fully understood and well tested. Two such prototypes, in both single phase (ProtoDUNE-SP) and dual phase (ProtoDUNE-DP) technologies, are under construction and will be operated at the CERN Neutrino Platform (NP) starting in 2018.

        Speaker: Alessandra Tonazzo
      • 10:40
        Super tau charm factory, HIEPA 20m
        Speaker: Guangshun Huang (University of Science and Technology of China (CN))
      • 11:00
        Novosibirsk: tau-charm factory and di-muonium experiment 20m
        Speaker: Pavel Piminov (Budker Institute of Nuclear Physics (RU))
      • 11:20
        SHIP 20m
        Speaker: Kyrylo Bondarenko
    • 11:40 12:00
      Coffee or lunch break
    • 12:00 13:30
      Session: Poster presentations and summary talk
      Convener: Olga Igonkina (Nikhef National institute for subatomic physics (NL))
      • 12:00
        4th place: Search for ultra-high energy neutrinos with the Pierre Auger Observatory 5m
        Speaker: Marta Trini
      • 12:10
        3rd place: Study of Michel parameters in tau decays at Belle 5m
        Speaker: Denis Epifanov (BINP)
      • 12:20
        2nd place: The Rare and Forbidden: Testing Physics Beyond the Standard Model with Mu3e 5m
        Speaker: Ann-Kathrin Perrevoort (Nikhef National institute for subatomic physics (NL))
      • 12:35
        1st place: On isospin breaking in tau input for (g-2) from Lattice QCD 5m
        Speaker: Mattia Bruno (BNL)
      • 12:45
        Summary talk 40m
        Speaker: Simon Eydelman (Budker Institute of Nuclear Physics (RU))