![]() 1: Gluino pairs can decay in such a way as to produce three leptons and/or anti-leptons. In one, a pair of particles that carry strong nuclear forces (such as a gluino, the gluon’s superpartner) are produced, with a relatively high rate, and these particles decay to quarks and/or antiquarks plus a chargino (a mixture of superpartners of the W particles and the charged Higgs particle that arises in supersymmetry) or a neutralino (a mixture of superpartners of the photon, Z, and the neutral Higgs particles.) The chargino and neutralino can then in turn decay to a lighter neutralino plus a W and Z particle, or plus W and Z virtual particles, in the process producing three (and very rarely four) leptons/anti-leptons. ![]() How does supersymmetry do it? There are actually many ways. the reply to comments on this article.By “multi-lepton event” people traditionally mean a particle collision in whose debris are found three or more charged leptons and/or anti-leptons of any “flavor” (electron, muon or tau.) (The leptons should be “isolated” - at least, far from anything that looks like a jet.) Supersymmetry is commonly a source of such events, at rates that can make it detectable above the backgrounds from known particle physics (as predicted by the equations of the Standard Model of particle physics.) The Solotvina Underground Laboratory and our group (in Russian).ĭiscussion in "Zerkalo Nedeli" newspaper on how to estimate scientific achievements (in Russian): The article in "2000",, on Dark Matter search (in Russian). On the publications of the LPD group (without self-references) The group afterwards (in 1984) built up an underground laboratoryĬonferences and workshops organized by the LPD group Starting the experiments on the earth level (in 1980), Violation of the Pauli principle, nuclear decays with cluster emission, rare β andĭuring almost 40 years the LPD has developed double beta decay investigations. With dark matter particles, transition of nuclei to super-dense state, Nuclear and particle physics, such as decay of electron or nucleons, interactions Possibility to simultaneously search for other rare or forbidden processes in Laboratories and with detectors constructed with super-pure materials. Radioactive background which can be reached only in deep underground Yr, being the most rare observed process of radioactive decay in the nature.ĭouble β decay experiments demand super-low Technique during the last years, an allowed in the SM two-neutrinoĢβ decay was observed in direct experiments forġ1 nuclei with T 1/2 in the range of ~10 18-10 24 However, due to big progress in the experimental Of particle physics, etc., explain the exceptional interest in theĭespite numerous efforts since 1948, neutrinoless 2βĭecay still remains unobserved. Relations of neutrino properties with evolution of veryĮarly and very old Universe, Solar neutrinos deficit, atmospheric neutrinosĪnomaly, existence of dark matter in Universe, and structure of modern theories Experimental observation of thisĮxotic phenomenon would be an unambiguous signal of new physics which liesīeyond the SM and which could be detected without use of huge and extremelyĮxpensive accelerators. However, many extensions of the SM predict non-zero neutrino mass and, as a Neutrinoless doubleīeta (2β0ν) decay is forbidden in the Standard Model (SM) ofĮlectroweak interactions since it violates lepton number conservation. Mainly for double beta (2β) decay of atomic nuclei. Is search for rare or forbidden processes in nuclear and particle physics, The principal scientific goal of the Lepton Physics Department (LPD) The russian authorities, the "second army of the world" and everybody who support the war: go fuck yourself! (see also Austria and Ukraine join APPEC)ĨDespite the russian invasion of Ukraine the Lepton Physics Department continues the scientific work. Volodymyr Tretyak is one of the 92 Ukrainian scientists selected by the Stanford University to be in the Updated science-wide author databases of standardized citation indicatorsħ Participants of the Laboratory of Young Scientists (Oksana Polischuk, Maria Romanyuk, Dmytro Kasperovych, Nazar Sokur) were awarded a Certificate of the National Academy of Sciences of UkraineĤ Ukraine became a member of the APPEC at the APPEC General Assembly July 19th, 2022 ![]() Performed by the LPD in 2018-2022 (in Ukrainian)ĩ The annual Lepton Physics Department winter seminars are scheduled for January 10th to 13th, 2023.ħ Work of Fedor Danevich in the Expert group for evaluation of textbooks for school of the Ministry of Education and Sciences of Ukraine (MONU) was marked with a Certificate of the Institute of Education Content Modernization of the MONUĩ Dr. Our Free scientific discussion page in Facebook (by invitation only)ģ Report on the project Study of rare decays of atomic nuclei, measurements of neutrino fluxes, searches for processes beyond the Standard Model of particles ![]()
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