Lepton Number Conservation. The new lepton was denoted by the Greek letter tau, which is the first letter of the word triton, (which means the third); the discovered lepton being the third charged lepton, after the electron and the muon. Baryon Number B: +1+1+0+0 11 Baryon number is conserved. The first lepton to be identified was the electron, which was discovered by British physicist J.J. Thomson and his colleagues in 1897 using a series of cathode ray tube experiments. As far as the standard model is concerned, the … Fields inherited from class JSci.physics.quantum.QuantumParticle; spinZ . We analyze muon and antimuon … The newly discov­ ered particles, psi(3095) and psi(3684), are mesons. This … The first lepton identified was the electron, discovered by J.J. Thomson and his team of British physicists in 1897. Therefore we get: µ− → e−ν¯ eν µ. Class AntiMuon java.lang.Object ... Returns the tau lepton number. A kaon can decay into pions, or a muon and an antineutrino, or an antimuon and a neutrino. Just as a picture can be worth a thousand words, so the rarest processes at the Large Hadron Collider (LHC) can sometimes have the most to tell us. The lifetime of the muon is 2.20 microseconds. They probe Mee , MJ%) and M^J matrix elements respectively. Ebooks Written By Mohit Joshi : The Mysterious World of Fundamental Particles. Close • Posted by 1 hour ago [Introduction to Particle Physics] The decay of a positive pion into an antimuon and antimuon neutrino isn't allowed right? Searches for lepton number violating decays K + → π − e + e + and K + → π − μ + μ + have been performed using about 30% of the data collected by the NA62 experiment at CERN in 2016–18. An antimuon neutrino has L. II = -1. It was to become the last Wulfrunian in service when it was finally withdrawn in March 1972. A close study of big bang nucleosynthesis, baryon asymmetries, cosmic microwave background bounds, galaxy dynamics, together with the Standard Model assumptions, help us to set a limit on the mass and width of the new gauge … The necessary energy for making a muon/antimuon pair from high-energy positrons colliding with electrons at rest is almost identical to the energy from … antineutrino - the antiparticle of a neutrino. In neutron rich nuclei a neutron may decay into a proton, electron and an anti electron neutrino. arXiv2103.11769 [hep-ex]. As one example, the antimuon has the same mass as a muon but has a charge of +1, a lepton number of -1, and muon number of -1. The two tauons then decay into an electron and a positron or a muon and an antimuon, and four of the various neutrinos . A lepton is an elementary particle and a fundamental constituent of matter. The lepton number is a conserved quantum number in all particle reactions ; A lepton number of 1 is assigned to both the electron and the neutrino and −1 to the antineutrino and the positron. similar to baryon number, but for leptons. A class representing antimuon neutrinos. An antiparticle has the same mass as its corresponding particle, but other properties such as electrical charge and lepton number are reversed. LHCb Collaboration (2021) Test of Lepton Universality in Beauty-Quark Decays. or antineutrino in the decay.. as lepton number, mu-ness and baryon number. Since muons are much lighter than tau leptons, the Higgs boson decay to a muon pair is expected to occur about 300 times less often than that to a tau-lepton pair. Lepton number is just a mathematical expression of what it means to be a lepton. ChrisVer said: if Lepton number and charge is conserved, the muon will be produced with an antimuon.... 1. For isotopes and ions, the mass number may be represented with the mass_numb keyword and the integer charge may be represented with the Z keyword. ⇒ All leptons have a quantum number known as a lepton number (L), which distinguishes them as leptons. the antimuon. Lepton flavor violating (LFV) processes are a smoking gun signal of new physics (NP). Help with GCSE Physics, AQA syllabus A AS Level and A2 Level physics. Figure 1: These two Feynman diagrams represent the interactions that lead to a bottom quark decaying to a strange quark and a pair of oppositely charged leptons (an electron and an antielectron or a muon and an antimuon)—a “flavor-changing neutral current” process that is allowed in the standard model but is extremely unlikely. The equation of state and chemical composition of degenerate matter (densities between 10 to the 11th and 10 to the 17th power g/cu cm) are investigated in the case of neutrino retention for initial lepton/baryon number ratios of 0.3 to 0.5. A Baryon number conserving dim-7 operators in SMEFT12 B Complete results for branching ratios in SMEFT14 1 Introduction The origin of neutrino mass and the nature of neutrinos remain a challenging issue in physics beyond the standard model. Created via strong interaction. This must be done so that the neutrino is … Dec 6, 2016 #22 spaghetti3451. ... second interaction shows an electron-positron pair annihilating with the resulting photon then pair producing a muon-antimuon … For example, the Z particle can decay in pairs of charged leptons (electron and positron, muon and antimuon, tau and antitau), in neutrino-antineutrino pairs (one pair for each charged lepton pair), or in quark-antiquark pairs, which will end up in some hadrons. Lepton Number L: 00+1 01 Lepton number is NOT conserved. For these two types of interactions, we can also check whether or not lepton number is conserved: For the decay into same-sign W boson pairs, the total lepton number is 0L + 0L + 0L = 0L. Similar to baryon number, but for leptons. ... Conservation of Lepton Numbers Total lepton number before interaction is equal to total lepton number after. TYPE 1 VACUUM FLUCTUATIONS When a Type 1 vacuum uctuation is created, the following quantities must be conserved: ... 2. bound muon-antimuon vacuum uctuation 3. bound tau-antitau vacuum uctuation. Strangeness. The Feynman diagram shows electron capture. Applications to (i) the suppression of sterile neutrino production, and (ii) the primordial Helium abundance are briefly presented. Beta Minus (β–) Decay. 25 An anti-electron neutrino must be produced to conserve lepton number. Electrons and neutrinos have positive lepton number (actually there are 3 lepton flavors but that's a different story). Electrons, muons and neutrinos have lepton number +1 and their antiparticles have lepton number -1. 23 9.11 x 10-31 kg 200 = 1.82 10-28 kg 24 L before = (+1) + (-1) = 0 L after = (-1) + (-1) = -2 The reaction cannot occur as it would violate the law of conservation of lepton number. Lepton number of anti-particles. baryon number of -1. this does mean that you can add a baryon-antibaryon pair to one side of a reaction, as their baryon numbers combine to make 0. In particle physics, a lepton is an elementary particle of half-integer spin (spin 1 ⁄ 2) that does not undergo strong interactions. So, we always need toof… apply the rule below separately tonumbe What is the charge muons. Their most per­ plexing property is their lifetime, which is 1,000 times longer than that of other particles of comparable mass, such as the rho meson. the antimuon. A lepton is an elementary, spin 1 ⁄ 2 particle that does not undergo strong interactions, but is subject to the Pauli exclusion principle. I lepton number I baryon number I angular momentum 15. B. Lepton number C. Charge D. Baryon number + + + 0 + 5a. If a muon and an electron each have the same de Broglie wavelength then they each have the same momentum. antimuon. Specified by: tauLeptonQN in class QuantumParticle Returns: 0. anti public QuantumParticle anti() Returns the antiparticle of this particle. isAnti public boolean isAnti(QuantumParticle qp) Physics revision site - recommended to teachers as a resource by AQA, OCR and Edexcel examination boards - also recommended by BBC Bytesize - winner of the IOP Web Awards - 2010 - Cyberphysics - a physics revision aide for students at KS3 (SATs), KS4 (GCSE) and KS5 (A and AS level). No members of the electron family appear on the left in Eq. For the decay into same-sign leptons pairs, the total lepton number … Various lepton number violating processes have: been discussed in the ... probably, muon-to-antimuon (/J,~,^I+) conversion [3]. In any reaction, this lepton number had to be conserved! Because the positron is the electron's antiparticle, it has an electron lepton number of -1 and a charge of +1. This is a list of particles in particle physics, including currently known and hypothetical elementary particles, as well as the composite particles that can be built up from them.. For a chronological listing of subatomic particles by discovery date, see Timeline of particle discoveries. antiparticle of the muon. As long as the energy of a collision is high enough to make the heavier leptons, nature shows no preference for one kind of charged lepton over any other. Two illustrative examples of conservation of lepton number are the decay of the pion and the decay of the neutron. antimuon, positive muon - the antiparticle of a muon; decays to positron and neutrino and antineutrino. The necessary energy for making a muon/antimuon pair from high-energy positrons colliding with electrons at rest is almost identical to the energy from … Antiparticles including the antimuon were detected. This must be done so that the neutrino is … Abstract. However, there is an extra detail - each generation has its own leption number. 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. NOTE: the muon branch of the lepton family and the electron branch have their own lepton numbers and L must be conserved for both branches . as lepton number, mu-ness and baryon number. the antimuon (+) - basically a 'heavy electron' (about 200 times the mass) the neutrino () and . The antimuon, being positively charged could be viewed as the heavy positron as it has quite similar properties except for its mass. electron-positron, etc. An int may be used as the first positional argument to Particle to represent an atomic number. lepton number violating ($) processes represent a most appropriate tool to address the ques-tion of the Majorana nature of neutrinos. Daniel Liden Date: February 15, 2021 Scientist with beakers . τ + and τ – can be formed by an electron-positron (antielectron) pair combining. AQA AS physics quarks lepton … A neutral pion decays into high-energy photons. By conservation of muon Lepton number? Antimuon (μ+) Anti-particle of neutrino. (ii) Explain how it may be deduced that this decay is a weak interaction process. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract. i.e. The muon lepton number is conserved following the interaction. Conservation of lepton numbers: In any change, the lepton number for each lepton branch before the change is equal to the total lepton for that branch after the change. Lepton Number: L = +1 for any lepton and -1 for any antilepton. HW Help. 16N.2.HL.TZ0.4b: The Feynman diagram shows the changes that occur during beta minus (β–) decay. lepton numbers; for example, the elec­ tron and the electron neutrino are as­ signed electron number 1, muon num­ ber 0 and tau number O. Antileptons are assigned lepton numbers of the op­ posite sign. Although some of the lep­ tons decay into other leptons, the to­ tal lepton number of the decay prod­ ucts is equal to that of the original The probability distribution of your RNG must be uniform. ton (lĕp′tŏn′) n. Any of a class of six elementary fermions, two in each of the three generations of fundamental fermions (one negatively charged and one neutral), and including the electron, electron neutrino, muon, muon neutrino, tauon, and tauon neutrino, together with their associated antiparticles, the antileptons. r 0 The lepton number is +1 for any (a)electrons a muon and neutrino (a) a muon neutrino lepton, -1 for any antilepton, and 0 for anyneutrino non-lepton. For isotopes and ions, the mass number may be represented with the mass_numb keyword and the integer charge may be represented with the Z keyword. The newly discov­ ered particles, psi(3095) and psi(3684), are mesons. The theory predicts that the different charged leptons, the electron, muon and tau, have identical electroweak interaction strengths. They have to be lighter than the muon. Determine the time interval from the emission of the particle from the s quark to its conversion into the d \({\rm{\bar d}}\) pair. The quantum fields which correspond to the particles we call leptons (electron, muon, tau, and their corresponding neutrinos) each have a lepton number of 1, and the fields corresponding to their antiparticles each have a lepton number of -1. But all the other quantum numbers such as electric charge, lepton number, and angular momentum of the particles produced should sum up to the value of zero. On the right side of Eq. In particular L e and L µ is conserved. It is classified as a lepton.As with other leptons, the muon is not known to have any sub-structure – that is, it is not thought to be composed of any simpler particles. As an example of L conservation, consider the case where an electron and positron annihilate and create a muon and an antimuon ( e + e - → μ + μ - ). Weak interaction (kaons to pions) Strangeness. concept of lepton number: Muon and antimuon (negative and positive charge) are their respective antiparticles and decay into (essentially) muon neutrino and muon antineutrino. bool : isNeutrino const A muon is a lepton. By conservation of muon Lepton number? Deduce that X must be an electron neutrino. Two main classes of leptons exist, charged leptons (also known as the electron-like leptons), and neutral leptons (better known as neutrinos). antitauon, tau-plus particle - an antilepton of very great mass. All of these particles have lepton number +1, and their antiparticles have lepton number -1. Particle physics and cosmology Particle physics and cosmology Outline for today News from the Event Horizon Telesope Review and So lepton number isn't violated - that takes out b) c) d). The antimuon, being positively charged could be viewed as the heavy positron as it has quite similar properties except for its mass. HW Help. Field Summary . Previous measurements have shown a wide range of particle decays are consistent with this principle of lepton universality. Production of a quark and anti-quark by a collision of an electron and an anti-electron. ... an electron is created to conserve charge and a corresponding antineutrino is created to conserve lepton number. A lepton is an elementary, half-integer spin (spin 1 ⁄ 2) particle that does not undergo strong interactions. ton (lĕp′tŏn′) n. Any of a class of six elementary fermions, two in each of the three generations of fundamental fermions (one negatively charged and one neutral), and including the electron, electron neutrino, muon, muon neutrino, tauon, and tauon neutrino, together with their associated antiparticles, the antileptons. All these particles have spins with equal magnitudes, , where is the Planck constant and is the spin quantum number (1/2). Leptons have a lepton number of +1, antileptons have -1 and nonleptons are 0. Electron leptons have a lepton number L e of +1 and their antileptons a lepton number … Particle Interactions. This paper proposes that the violation is derived from the binary isotope mixture of two beauty-quarks, b 7 (4979 MeV mass) and b 8 (143,258 MeV mass) whose masses are calculated from the periodic table of elementary particles. I … 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. Note that there ar e three types of lepton numbers: Not a bound muon–antimuon onium, but an electron–antimuon bound state, and whose name was assigned by IUPAC. In this case, lepton number is conserved! Charge of the electron is -1, and antimuon is +1. The number of leptons is also conserved. The number of leptons and baryons must be conserved. Their most per­ plexing property is their lifetime, which is 1,000 times longer than that of other particles of comparable mass, such as the rho meson. An int may be used as the first positional argument to Particle to represent an atomic number. Lepton number is a conserved quantity in fundamental particle physics.As would be expected, this quantity is associated with the class of elementary particles called leptons: the electron, muon, and tau particles, and their corresponding neutrinos. The antimuon has a lepton number of -1, so we need a normal lepton to balance it, and this lepton needs a charge of 0 to balance the charge. The lepton number (in this case 0) is conserved at each vertex for each kind of lepton separately. Antimuon Antiparticle of the muon. See Also: Serialized Form. Lepton number is conserved during any interaction. Charged leptons can combin 7 ... A lepton number is assigned to every lepton (+1) and antilepton (-1), on the basis that the total lepton number for each branch of the lepton family is always conserved. ... an electron is created to conserve charge and a corresponding antineutrino is created to conserve lepton number. Electron - positron annihilation Thread starter ravisastry; Start date Sep 20, 2010 Sep 20, 2010 Whether the particle is a lepton. >>> proton = Particle (1, mass_numb = 1, Z = 1) Atomic Number Binding Energy Frequency Charge Momentum Photon Energy Lepton Number Position Energy Mass Defect Time Number of Radioactive Nuclei Activity Planck Constant Decay Constant De Broglie Wavelength Half-Life Atomic Mass De Broglie Wavelength Specified by: tauLeptonQN in class QuantumParticle Returns: 0. anti public QuantumParticle anti() Returns the antiparticle of this particle. When a positive pion, π +, decays, it generally (99.99% of the time) decays into an antimuon, μ +. Quarks have no or 0 lepton number. I'm so confused, I was under the impression that neutrinos had no lepton number but apparently they do?? There are 100 gev-related words in total, with the top 5 most semantically related being synchrotron, protons, mev, isuzu and ignis.You can get the definition(s) of a word in the list below by tapping the question-mark icon next to it. When a single tauon decays, it is the only lepton that can decay into hadrons (things made of quarks). Lepton number. ... A lepton (antilepton) has a lepton number 1 (-1), while a quark has 0. These things must be conserved in a particle interaction: energy. And due to its high mass, it is unstable. 22 Total lepton number before interaction = total lepton number after interaction. 45-13, so there the net electron lepton number must be 4 = o. Muons, on the other hand, have an electron number of 0 but have corresponding “muon numbers.” The Standard Model requires that certain types of interactions, say the decay of a Higgs boson, always conserve lepton flavor. For the decay into same-sign leptons pairs, the total lepton number … The actual detection was thus only that of an electron (positron) and an antimuon (muon), i.e., two different leptons with opposite charges, which apparently violates the law of lepton number conservation. As the neutrino and the antineutrino are the lightest particles in the final state, we will start by assigning their spins first. excited state when the orbital configura­ Charged matter that can decay into: - muon and antineutrino - antimuon and neutrino. momentum. Searches for lepton number violating decays K + → π − e + e + and K + → π − μ + μ + have been performed using about 30% of the data collected by the NA62 experiment at CERN in 2016–18. 45-13, the position, being an antiparticle (again see Table 45-2), has the electron lepton number 4 = – I. Just as there are six leptons, there are six antileptons. 1,344 33. For example, when an antimuon decays, it changes into a positron, an electron neutrino and a muon antineutrino. number is conserved. All these particles have spins with equal magnitudes, , where is the Planck constant and is the spin quantum number (1/2). ... A lepton number is assigned to every lepton (+1) and antilepton (-1), on the basis that the total lepton number for each branch of the lepton family is always conserved. A muon is a subatomic particle with a negative charge that is similar to an electron in that it has a negative charge and a similar spin. State the quark structures of a meson and a baryon. Etymology The name lepton comes from the Greek "λεπτόν" (lepton), neuter of "λεπτός" (leptos), "fine, small, thin" [14] and the earliest attested form of the word is the Mycenaean Greek re-po-to, written in Linear B syllabic script. To recapitulate: Types of leptons include the electron, positron, muon, antimuon, electron neutrino, electron antineutrino, muon neutrino and muon antineutrino. If neutrinos are Majorana fermions, the lepton number is violated by two units. Particles having net spin … Like before, there are also lepton numbers which must be conserved in interactions. For simplicity, they are commonly represented by the Greek letter mu, or μ. How-To Tutorials; Suggestions; Machine Translation Editions; Noahs Archive Project; About Us. In the center-of-mass reference system (in which the electrons and positrons collide head-on with the same energy E ), the threshold energy is reached when the particles have been accelerated to speeds about 0.999988 times the speed of light. This is like a ‘strange quark number’, like baryon or lepton number, except backwards: if a particle has one strange quark in it, it has a ‘strangeness’ of -1. Electrons belong to the first generation of the lepton particle family, and are generally thought to be elementary particles because they have no known components or substructure. Like all elementary particles, the muon has a corresponding antiparticle of opposite charge but equal mass and spin: the antimuon (also called a positive muon). A number of other high energy particulate radiations such as positrons, muons, and pions were discovered by cloud chamber examination of cosmic ray reactions shortly thereafter, and others types of particle radiation were produced artificially in particle accelerators, through the … An tau particle has L. III = +1. Neutral Pion. And due to its high mass, it is unstable. Charge Q: 0+1–1+0 00 Charge is conserved. A positron is an antiparticle and so has L. I = -1. -lepton number 1 and antileptons have lepton number -1. electron -charge -1-antiparticle positron. In particle physics, a lepton is an elementary particle of half-integer spin (spin 1⁄2) that does not undergo strong interactions. The W complex includes both pion and lepton virtual particle-antiparticle pairs; the positive leptons react with a negative pion as seen previously in meson decay 3b. Conservation of lepton numbers: In any change, the lepton number for each lepton branch before the change is equal to the total lepton for that branch after the change. 5b.Distinguish between hadrons and leptons. Lepton number must also always be conserved, and each type must be conserved in its own right. bool : isMuon const : Whether the particle is a muon (or antimuon). Charge: +1 e Spin: ½ Rest mass: 105.658 MeV⁄c 2 Lepton number: -1 The antimuon, like all other antimatter leptons is an elementary fermionic particle. A muon has a greater mass than an electron. [1 mark] [2 marks] [2 marks] Or wikipedia. Meaning a) is also not correct.. Opposite lepton number (+1 = -1) Strange particles. - antimuon and neutrino. bool : isElectron const : Whether the particle is an electron (or positron). The total energy of the particle represented by the dotted line is 1.2 GeV more than what is allowed by energy conservation. The Majorana wave functions would have to fulfill the charge conjugation invariance bool : isTau const : Whether the particle is a tau (or antitau). Antineutrino. A celebrated example of $ process, most advanced ... antimuon [13] conversion, tri-muonium production in neutrino muon scattering [14], and the Number of leptons in a particle. This is known as lepton conservation, which has an associated quantum number of lepton L. Leptons have L = +1 and antileptons have L = -1, whereas quarks have L = 0. All leptons (such as the electron) have a lepton number of L = +1, but a charge Q = -1(e) or 0; ... ⇒ The decay equations for the muon and antimuon can be seen below: Therefore, if the electric charge of one particle is +1, then the other particle has an electric charge value of -1. Search for the lepton-flavor-number violating decay kaon long decays to neutral pion muon antimuon electron positron in the full E799II kaons at the TeVatron data set Bellavance, Angela Maria; Abstract. electrons, muons and neutrinos have lepton number +1 and their antiparticles have lepton number -1. Lepton (tiếng Việt đọc là Lép tôn hay Lép tông) là những hạt cơ bản, có spin bán nguyên (spin 1 ⁄ 2) không tham gia vào tương tác mạnh, nhưng tuân theo nguyên lý loại trừ Pauli. Etymology The name lepton comes from the Greek "λεπτόν" (lepton), neuter of "λεπτός" (leptos), "fine, small, thin" [14] and the earliest attested form of the word is the Mycenaean Greek re-po-to, written in Linear B syllabic script. Examples. The muon (/ ˈ m juː ɒ n /; from the Greek letter mu (μ) used to represent it) is an elementary particle similar to the electron, with an electric charge of −1 e and a spin of 1/2, but with a much greater mass. As one example, the antimuon has the same mass as a muon but has a charge of +1, a lepton number of -1, and muon number of -1. Strange particles decay through. ... Returns the tau lepton number. (Lepton numbers are supplied on the Data Sheet). By isolating and counting decays of B+ mesons to a kaon and two leptons, the LHCb experiment has tested a key assumption of the Standard Model – lepton universality, the idea that electrons, muons and tau leptons should behave in the same … A neutral pion decays into high-energy photons. As the neutrino and the antineutrino are the lightest particles in the final state, we will start by assigning their spins first. Example: The total lepton number on both sides is the same = +1 However, in terms of muons and muon antineutrinos the number changes from +1 to 1 In terms of electrons and electron neutrinos the number changes from 0 to +2 Therefore this interaction is not permitted The (hypothetical) leptoquark is the even heavier ancestor of the quarks and leptons; in the table it is indicated at the head of both the leptonic and quark series, for although a (fractured) lepton when compressed, when expanded it reveals three sub-units, the quarks. The decay products, however, would count as one and the same, identical particle. Specified by: anti in class QuantumParticle. The K 0 decays into two pions as shown in the Feynman diagram. In the example of beta-minus decay, there are no leptons initially present, and after the interaction there is one lepton and one antilepton – a net result of zero again. It was new in 1960 to County Motors of Lepton but was sold to West Riding after a couple of years service along with UCX276. The theory predicts that the different charged leptons, the electron, muon and tau, have identical electroweak interaction strengths. Charge must be conserved. Charged leptons interact through the … Example: This decay cannot happen Conservation of the lepton number is useful in studying interactions, and decay processes, in which β particles (positive or negative) are produced. That's what lepton universality means, and it's why the branching ratio is the same for electron-positron pairs, muon-antimuon … muons antimuon muon decay muonic hydrogen anti-muon mu Mu lepton mu meson mu mesons mu-meson. For these two types of interactions, we can also check whether or not lepton number is conserved: For the decay into same-sign W boson pairs, the total lepton number is 0L + 0L + 0L = 0L. The muon lepton number is conserved following the interaction. In weak interactions, the total number of quarks minus the total number of antiquarks is the same both before and after the interaction. charge. An antielectron neutrino has L. I = -1. Both the ATLAS and CMS Collaborations have already observed the Higgs boson decaying to tau lepton – the muon’s heavier cousin, belonging to the third “generation” of fermions. However, while an antimuon has lepton number -1, a pion has zero muon number. When a W+ boson decays into a positron and a neutrino, lepton number is conserved because the W+ boson is a non-lepton, the neutrino is a lepton, and the positron is an antilepton. The muon is a lepton which decays to form an electron or positron.. particles and antiparticles that can interact through the strong interaction. They assigned a lepton number L=+1to the electron, muon, and neutrino, and L=-1to the positron, antimuon, and antineutrino. 1). The electron has a lepton number of +1. These processes can be represented by the diagrams or or . A slight asymmetry in the laws of physics allowed leptons to be created in the Big Bang. Charge: +1 e Spin: ½ Rest mass: 105.658 MeV⁄c 2 Lepton number: -1 The antimuon, like all other antimatter leptons is an elementary fermionic particle.
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