Conveners
Session: Welcome
- There are no conveners in this block
Session: Tau properties - I
- Yuping Guo
Session: Tau properties - II
- Matthias Jamin
Session: Flavor puzzles
- Gregory Max Ciezarek (CERN)
Session: Lepton Flavor Violation with taus and muons
- Robert Fleischer (Vrije Universiteit Amsterdam)
Session: Standard Model measurements with taus at the LHC
- Keti Kaadze (Kansas State University (US))
Session: Beyond Standard Model measurements with taus at LHC - I
- Luca Fiorini (Univ. of Valencia and CSIC (ES))
Session: Beyond Standard Model measurements at the LHC - II
- Cristina Galea (Nikhef National institute for subatomic physics (NL))
Session: Neutrino - I
- Vittorio Paolone (University of Pittsburgh)
Session: Neutrino - II
- Paul De Jong (Nikhef National institute for subatomic physics (NL))
Session: g-2 theory
- Mattia Bruno (BNL)
Session: g-2 experiments
- Charles Timmermans
Session: QCD
- Elisabetta Pallante
Session: Muon experiments
- Nicolo De Groot (Department of Experimental High Energy Physics)
Session: Future detectors - I
- Kenji Inami (Nagoya university)
Session: Future detectors - II
- Marcus Matthias Morgenstern (Nikhef National institute for subatomic physics (NL))
Session: Poster presentations and summary talk
- Olga Igonkina (Nikhef National institute for subatomic physics (NL))
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...
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...
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...
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...
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...
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...
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).
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.
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...
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.
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...
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...
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...
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 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.
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...
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.
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...
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...
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.
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.
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.
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.
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...
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 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...
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...
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...
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...
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...
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...
