We can see that the particles have lepton number +1 and the antiparticles have a lepton number -1. The scale of new physics Λ must be relatively low, Λ≤500 GeV. However, the decay of the muon into an electron produces a distribution of electron energies, showing that it is at least a three-body decay. Instead, to this point, lepton flavor conservation is an experimental fact. Likewise, a decaying negative muon results in the creation of a muon neutrino, while a decaying positive muon results in the creation of a muon antineutrino. Wave centers centers must be at the nodes of standing waves to be stable and the other geometric arrangements likely do not lead to this stability. The concept of lepton number is a slippery one if sterile neutrinos exist and mix in vacuum with ac-tive species. • A muon (&!) Lepton Decay. Every lepton has a corresponding antilepton. The lepton family number carried by the neutrino is defined by the left-handed current of the neutrino family. As described in the calculations of particles, leptons appear at the same magic numbers found in atomic elements. The water-based detectors Kamiokande II and IMB detected 11 and 8 antineutrinos (lepton number = −1) of thermal origin, respectively, while the scintillator-based Baksan detector found 5 neutrinos (lepton number = +1) of either thermal or electron-capture origin, in a burst less than 13 seconds long. We focus on the muon decay at rest (DAR) result from the Liquid Scintillation Neutrino Experiment (LSND) and the Karlsruhe and … has a muon lepton number "$=+1. Lepton number conservation states that the sum of lepton numbers before and after the interaction must be the same. Unless, the question specified that it is the lepton number for an electron type anti-neutrino. Muon neutrino. Lepton number. A lepton is a type of fermion with a charge of 0 or -1 Electron Muon Tau Electron neutrino Muon neutrino Tau neutrino Electrons and neutrinos are stable, while the Tau and Muon are heavier and tend to decay quickly. One important thing about leptons, then, is that electron number, muon number, and tau number are always conserved when a massive lepton decays into smaller ones. As such, electrons and neutrinos are leptons. The massive leptons are the electron, muon and tau, and each of them has an associated neutrino. A lepton is an elementary, half-integer spin (spin 1 ⁄ 2) particle that does not undergo strong interactions. From 1964 to 1967, it was established in similar experiments that when v μ collide with nuclei, μ-are created but μ + are not, that is, the muonic neutrino v μ and the muonic antineutrino v̀ μ are not identical, and an additional lepton number, L μ, which is conserved, must be introduced. It has no net electric charge and a spin of ½. There are three different lepton number s: the electron-lepton number \(L_e\), the muon-lepton number \(L_{\mu}\), and the tau-lepton number \(L_{\tau}\).In any interaction, each of these quantities must be conserved separately. The lepton family number is defined through the weak basis of the SU(2) doublet, where the charged lepton mass matrix is real and diagonal. Neutrino oscillation is a quantum mechanical phenomenon whereby a neutrino created with a specific lepton family number ("lepton flavor": electron, muon, or tau) can later be measured to have a different lepton family number. Our results show the significance of muon and tau lepton number angular distributions, together with the traditional electron lepton number ones. Subatomic particle - Subatomic particle - Charged leptons (electron, muon, tau): Probably the most-familiar subatomic particle is the electron, the component of atoms that makes interatomic bonding and chemical reactions—and hence life—possible. lepton (lĕp´tŏn´) [Gr.,=light (i.e., lightweight)], class of elementary particles [1] that includes the electron [2] and its antiparticle [3], the muon [4] and its antiparticle, the tau and its antiparticle, and the neutrino [5] and antineutrino associated with each of these particles. We can see that the particles have lepton number +1 and the antiparticles have a lepton number -1. Summary. The muon neutrino is a subatomic lepton elementary particle which has the symbol ν μ. Along with +!e+ decays, two other rare muon processes provide the most stringent current Conservation of the number of leptons of different flavors (for example, electron number or muon number) may sometimes be violated (as in neutrino oscillation). and lepton number-driven medium enhancement [3, 16]. • The anti-electron neutrino ($%")has an electron lepton number ""=-1. A lepton number of 1 is assigned to both the electron and the neutrino and −1 to the antineutrino and the positron. We show that lepton number violating muon decays, μ+→e++¯¯¯¯¯νe+¯¯¯¯νi (i=e,μ or τ), can consistently explain the neutrino anomaly reported by the LSND experiment. Let's take an example decay. Lepton number conservation, like electric charge conservation, plays an important role in understanding reactions involving leptons. Tau neutrino. The reaction is thus μ--> e-+ ν e + ν μ. In essence, lepton number can be cre-ated [17, 18] or destroyed [19, 20] by active-sterile neu-trino interconversion. Lepton Number Conservation. • The anti-muon ((&) has a muon lepton number #)=-1. The electron and electron neutrino (and their antiparticles) are one set, the muon and muon neutrino are another, and the tau and tau neutrino make up the third. However, theory does not necessitate that lepton number always be conserved. Together with the muon it forms the second generation of leptons, hence the name muon neutrino. This principle is known as conservation of lepton number. Muon neutrino. Two effective operators in the Standard Model are identified which lead to just such decays and no other processes. There are 6 types of lepton. The recent supernova simulations with muon production call for such an analysis, as they relax the standard νμ;τ ¼ ν¯μ;τ (two-flavor) assumption. Together with the muon it forms the second generation of leptons, hence the name muon neutrino. Muon number and tau number operate analogously with the other two lepton families. Mixing between light and heavy neutrinos can induce lepton-flavor and total-lepton-number violation in the light sector, even if the light neutrino masses are zero or extremely small, because the states actually produced in weak processes are generally nonorthogonal. Most experiments involving neutrinos involve electron neutrinos which are much more common in our low-energy world, but some current neutrino detectors are sensitive to the other two as well. avors, each accompanied by a conserved lepton-avor number.2 In modern textbooks, we describe (negative) muon decay as !e e ; the electron neutrino and the muon neutrino are di erent objects. Lepton numbers are just ways to see what types of leptons are going to come out of a reaction given some particle goes in. Quark Sector Heavy Neutrino Muon Capture Neutral Lepton Lepton Number Conservation These keywords were added by machine and not by the authors. All lepton numbers add up to zero after the decay, and they are zero before the decay, since the Xi-minus is a baryon. But it is pointless to include the word "electron" in the question because the answer would be same no matter if you were talking about the anti-particle of any neutrino (be it a electron, muon or tauon type). Tau neutrino. Lepton number is conserved because the electron has lepton number of +1 and a neutrino has lepton number … The same pattern is observed for the muon. This process is experimental and the keywords may be updated as the learning algorithm improves. For example in electron capture one electron goes in and a neutrino goes out. Electron, Muon, and Tau Neutrinos. Abstract: We develop the consequences of introducing a purely leptonic, lepton number violating non-standard interaction (NSI) and standard model neutrino mixing with a fourth, sterile neutrino in the analysis of short-baseline, neutrino experiments. 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