Nuclear Physics Program • High Energy Physics Program, Experimental High Energy Physics on ATLAS, Setting Benchmarks Beyond the Tonne-Scale: Beyond the "Lobster Plot", Uncovering the Mechanism of Neutrinoless Double-Beta Decay: Ancillary Measurements and Theory, Setting Benchmarks Beyond the Tonne-Scale: Working Session, Experiments Beyond the Tonne-Scale: Background Challenges, Experiments Beyond the Tonne-Scale: Working Session, Experiments Beyond the Tonne-Scale: Isotopes, Materials, and Facilities, Experiments Beyond the Tonne-Scale: New Technologies. Neutrinoless double beta decay and lepton number violation at the LHC @article{Helo2013NeutrinolessDB, title={Neutrinoless double beta decay and lepton number violation at the LHC}, author={J. Helo and M. Hirsch and S. Kovalenko and H. Pas}, journal={Physical Review D}, year={2013}, volume={88} } The dataset corresponds to an integrated luminosity of 4.9 fb−1 at a centre-of-mass energy of 7 TeV and 19.7 fb−1 at 8 TeV. A proof of concept detector is presented for scintillation light detection in liquid argon using silicon photo-multipliers. 203-206, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 654, Issue 1, 2011, pp. Double-Beta Overview Experimental groups worldwide are working to develop detectors that may allow the observation of neutrinoless double-beta decay. Copyright © 2015 Elsevier B.V. All rights reserved. 95 (2005) 182302, arXiv:hep-ex/0507083. Wendell Furry. The LNV process has been sought in many experiments. Figure 2: Neutrinoless double beta decay mediated by the standard mechanism, the virtual exchange of a light Majorana neutrino. The process probably most strongly connected to the history of neutrino research is the β-decay. Doublebetadecay,therarestknownnucleardecayprocess,canoccur indifferentmodes: Hadronic tau lepton decays are reconstructed calorimeter based and separation against QCD-induced jets is done relying on shapes of energy depositions in the calorimeter as well as tracking based variables. No excess of data over the expected backgrounds is observed in this search for additional Higgs bosons, and exclusion limits on the production cross section times branching fraction are derived and interpreted in the MSSM parameter space for different scenarios. the decay product is higher than the original nucleus. From Physics World. The simultaneous decay of 2 neutrons into 2 protons, however, might be possible. Neutrino-less double beta decay is the most sensitive probe of lepton number violation and a powerful tool to study the origin of neutrino masses. 13 citations. An outlook to the improved tau reconstruction to be used in the next data-taking period of ATLAS concludes the proceedings. It has, since then, drawn attention to it for being useful to study the nature of neutrinos (see quote). Neutrinoless double beta decay could also answer this question. Neutrinoless double beta decay has never been observed. arXiv:1502.00581; Gran Sasso Summer Institute 2014 Hands-On Experimental Underground Physics at LNGS (GSSI14), September 2014 Google Scholar The alternative is the neutrinoless double-beta decay (), proposed by Furry after the Majorana theory of the neutrino . This process has not been observed, and it is not known whether it exists. Neutrinoless double beta decay and Majorana neutrinos Double beta (bb) decay is a second-order weak process that transforms a nuclide of atomic number Z into its isobar with atomic number Z +2. In the case of the 2nbb-decay mode, the spectrum is continuous, extending from 0 to Qbb and peaking below Qbb=2. conversion in nuclei [4], neutrinoless double-beta decay, muonic analogue of the neutrinoless double-beta decay [5], etc. The neutrinoless decay can only take place if the neutrino is a massive Majorana particle and demands an extension of the standard model of the electroweak interactions, because it violates the lepton number conservation. References (36) J. Suhonen et al. The most interesting decay mode for DBD processes was discussed by Furry in 1937 [2] and is called neutrino-less Double Beta Decay (0 DBD). A detailed study of alpha interactions on the passivation layer on the end-plate of a true-coaxial high-purity germanium detector is presented. To date, no neutrinoless double-beta decay has been observed, with limits on the lifetime (> 1025 yr) being longer than that for observed 2-neutrino decays.6 Draw a Feynman diagram for neutrinoless double-beta decay, as due to the decay of two d-quarks. (NEMO), Phys. After the discovery of a Higgs boson at the LHC in γγ, ZZ and WW final states in 2012, the ATLAS collaboration also observes an excess of data over the predicted background in ττ final states, which is consistent with the decay of the discovered Higgs boson with mH≈125 GeV. https://doi.org/10.1016/j.nuclphysbps.2015.02.039. Werner Maneschg (Heidelberg, Max Planck Inst.) [1] [2] In 1937, Ettore Majorana demonstrated that all results of beta decay theory remain unchanged if the neutrino were its own antiparticle, now known as a Majorana particle. Double-beta processes play a key role in the exploration of neutrino and weak interaction properties, and in the searches for effects beyond the standard model. Lett. The neutrinoless double beta decay. Ettore Majorana 2. Ph 406: Elementary Particle Physics Problem Set 9 K.T. Racah and Furry suggested this was possible for Majorana particles in 1937 soon after Majorana published his theory! First evidence for neutrinoless double beta decay is observed giving rst evidence for lepton number violation. Tau leptons play an important role in the measurement of Standard Model processes, in the search for new physics (Supersymmetry, heavy resonances) and in the measurement of Higgs boson properties. 211-215, Nuclear and Particle Physics Proceedings, Volume 260, 2015, pp. Observation of this process would Exchange of a few unknown parameters when lepton number is not yet known whether it exists the Standard of... Which was associated with beta decays ( 2nbb ), FLASY2019 3 to develop detectors may... Arrive at an observable level even if the neutrinos are massive Majorana particles ( i.e., own... 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