The main decay mode (98.798%) is into two photons: . A little more Relativistic Kinematics The pi-zero meson (rest mass times c^2 of 134.9764 MeV) decays into two photons with a very short lifetime (8.4 x 10^-17 seconds). Rev. Click hereto get an answer to your question ️ Pick out true statements from the following : (a) The rest mass of photon is zero(b) pi - meson in nuclear field is analogous to photon in electromagnetic field(c) Neutral pi - meson decays into two gamma - ray photons(d) Graviton … question 40 states that a neutral pie on with best energy of 135 Emmy be produced in a high energy particle experiment. Electrons have no color charge, they do not feel the strong nuclear force. The meson K 0 consists of a d quark and an anti s quark. decay into electrons and antineutrinos or positrons and neutrinos. We have searched the Mark II PEP data ... standard Am technique for the daughter Do meson decays to K-b and K-n+lr”. The pi meson is a particle that has a rest energy of 135 MeV. The neutral pi-meson (pi-naught or π 0) decays into two photons, one of which escapes from the bubble chamber while the other "converts internally" and appears in the bubble chamber as an e-e + pair coming from the collision point. that there were two kinds of mesons, the heavier meson decaying into the light one and something invisible. In the case of the tau -> pi^0 pi^0 pi^- nu_tau decay mode, a vector current contribution is generated by eta pi mixing in the decay chain tau -> eta rho nu_tau -> pi^0 pi^0 pi^- nu_tau. In particle physics, a pion (or a pi meson, ... decay mode, with a branching ratio of BR 2γ = 0.98823 , is into two photons: π 0 → 2 γ. Photons and gluons are among them, and the recently discovered Higgs boson, which was theorized a long time ago as being a requirement for … Find the energy, momentum, and θ of the gamma rays. ... aligned by two mirrors to go into a half-wave plate. 15 - A pi meson at rest decays according to +v. A meson is a nuclear particle that is more massive than an electron but less massive than a proton or neutron. nearby meson states. 15 - Two protons approach each other with 70.4 MeV of... Ch. Measuring the muon anomalous magnetic moment g–2 and the rare decays of light pseudoscalar mesons into lepton pair P → l + l − serve as important test of the standard model. Mesons are unstable particles made up of a quark and an anti quark pair bounded by or held inside the particle by string interaction mediated by the gluon. Measurement of the final states omega pi^0,rho eta,rho eta' from psi(2S) electromagnetic decays and e+e- annihilations : Phys. it creates new short-lived particles and antiparticles, as well as photons by colliding with gas atoms in the atmosphere including: the muon, the pion and the kaon 2 Why is the K meson called a strange particle These photons are directed in separate paths towards the polarizers. Quantum ... two photons of identical polarization are produced: a signal photon and an idler photon. When focusing on direct photons, $\pi^{0}$ and $\eta$ mesons contribute as huge backgrounds. π+ are made up of one up quark and one anti-down quark. However, there is some probability (from <0.1% to 1.2%) involved with the decay of some pions, as they can also decay into different forms. It decays into two gamma-ray photons and no other particles. 1, p. 157-242 , 2000 The +/- pions are charged. ... As a result of this process, two photons of identical polarization are produced: a signal photon and an idler photon. The reaction is observed in a … (2 marks) (ii) State two properties, other than energy and momentum, that are conserved in this decay. m, where m Kˇˇˇis the invariant mass of the D0 meson candidate, and m= m Kˇˇˇˇ slow m Kˇˇˇis mass di erence between the D(2010)+ and D0 meson candidates, is used to de ne signal and sideband regions with which to perform the amplitude analysis and study sources of background contamination. Very few studies were attempted with electromagnetic probes and, in particular, with real photons since their production cross sections are relatively small compared to the dominant production of vector mesons. The 15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, MENU-2019 https://events.mcs.cmu.edu/menu2019/ June 2-7, … The results for the \pi^{0}, although off the experimental rate by 15%, is much closer than the usual expectations from a potential model. If the two photons are observed in the laboratory with energies E 1 and E 2 and angle α between them, what is their invariant mass? D70(2004)112007 : Measurements of psi(2S) decays into varphi pi^0,varphi eta, varphi eta',omega eta and omega eta' Phys. Yuxin Ye. It decays to two photons. ... Factorization ( jstor ) Mesons ( jstor ) Momentum ( jstor ) Photons ( jstor ) Pions ( jstor ) Quarks … The pi meson, a particle which is positively charged, negatively charged or neutral and has a rest mass greater than a muon, but less than a proton. Henning Berghäuser, Investigation of the Dalitz decays and the electromagnetic form factors of the η \eta and π 0 \pi^0-meson, 2010 (spire:1358057) Discussion of Dalitz decay of quarkonium: Yu Jia, Wen-Long Sang, Observation prospects of leptonic and Dalitz decays of pseudoscalar quarkonia, JHEP 0910:090, 2009 (arXiv:0906.4782) Of charmonium: When they enter the atmosphere, they collide with atoms and create photons and new particles & antiparticles (muon, pion/pi meson, kaon/K meson) The Because of its spin \(S=0\) it cannot decay through a virtual photon to an electron-positron pair. It developed out of the MINT project used in the fitting of three and four-body pseudoscalar decays by the CLEO-c and LHCb colloborations. 5. lambda zero decays to a proton and a pi-minus via the weak interaction. a) Write expressions for the momentum four-vectors of the photons in the pion rest frame. READ PAPER. tot (η), is presented. (a) Find the speed of the K 0 if the greatest possible energy of a π-meson from this decay is α times larger than the smallest possible energy. There are two uncharged kaons, the k0 meson, and the (anti)k0 meson. So , they must share equally in the energy of the pion . We measure exclusive hadronic decays of the P-wave spin-triplet charmonium states chicJ, where J = 0, 1, 2, into 4-hadron final states with two charged and two neutral mesons. Ch. 6 a sigma plus decays to a proton and a pi-zero via the weak interaction. It decays via the electromagnetic force, which explains why its mean lifetime is much smaller than that of the charged pion (which can only decay via the weak force). Since mesons are made up of quark - antiquark pair they are really unstable. The chicJ are produced in radiative decays of 3.08 million psi (2S) observed in the CLEO III [1] and CLEO-c [2] detectors. It includes the contribution of the pseudoscalar mesons to the muon anomalous magnetic moment (AMM), the rare decays of light pseudoscalar mesons to lepton pair, g–2, the transition form factors of pseudoscalar mesons at large momentum transfer, the pion … AmpGen is a library and set of applications for fitting and generating multi-body particle decays using the isobar model. 7. electron positron annihilation to two photons. tau- -> pi- pi- pi+ neutrino decays via the pseudoscalar pi(1300)- are small. version of this situation where a pi meson decays down to an electron and positron. The sum of the energies of the two photons has to be 135 MeV, because of energy conservation, so each photon has half this energy. Other Forms of Pion Decay. 4 K zero decays to a pi-minus and pi-plus via the weak interaction. The pi meson has a rest mass of 135MeV/c2. Chiral unitary approach to meson-meson and meson-baryon interactions and nuclear applications JA Oller Berber, E Oset Báguena, À Ramos Gómez Progress in Particle and Nuclear Physics, 2000, vol. Ł However, a more subtle occurrence was the equal numbers of pi(0), pi(+), and pi(-) mesons created. 11. S = 1 meson (triplet state), and one way to make an S = 0 meson (singlet state). In the above decay mode, neutral rho meson decay into two neutral Pion, neutral rho meson has -1 and neutral Pion has +1 for C such that decay violates C symmetry. ... Z or W bosons, or fermions — which CMS and ATLAS can detect. The radiative decays, π± → l±νγ and K± → l±νγ, with l standing for an e or a µ, and γ for a real or virtual photon (e+e− pair), provide a powerful tool to investigate the hadronic structure of pions and kaons. The K1 decays primarily into a state with two pi mesons (pions), which is even under CP, while the K2 decays primarily into a state with three pi mesons, which is odd under CP. Because of its spin \(S=0\) it cannot decay through a virtual photon to an electron-positron pair. The decay of the pion into three photons could conserve energy and momentum. into D*- mesons plus charged leptons or mesons. A hyperon is any baryonic form of matter that may exist in a stable form within the core of some neutron stars. It decays in flight and the photons are emitted in paths along the direction of motion of the meson. a) If one photon has an energy that is nine times greater than the other photon, calculate the speed of the ∏° meson. We conclude that the Two-Body Dirac equations lead to wave functions which provide good descriptions of the two-gamma decay amplitude and can be used with some confidence for other purposes. 7. electron positron annihilation to two photons. These photons are directed in separate paths towards the polarizers. it creates new short-lived particles and antiparticles, as well as photons by colliding with gas atoms in the atmosphere including: the muon, the pion and the kaon 2 Why is the K meson called a strange particle The charged pions \(\pi^+,\pi^-\) … Hadrons are categorized into two families: baryons (such as protons and neutrons) made of three quarks, and mesons (such as pions) made of one quark and one antiquark. Because of Pions are the lightest mesons and, more generally, the lightest hadrons. Consider the decay of the neutral π meson of (total) energy E π to two photons, π0 → γγ. This is masked by the fact that the pi(0) has a shorter life than its other charged counterparts. 3. It quickly decays into two photons. The K0 decays into two pions as shown... 12N.3.HL.TZ0.22a: State the name of a particle that is its own antiparticle. This means that the relative velocity of two photons approaching each other in free space, when … We conclude that the Two-Body Dirac equations lead to wave functions which provide good descriptions of the two-gamma decay amplitude and can be used with some confidence for other purposes. An interesting example of a particle interaction which involves the D meson was observed in a bubble chamber at SLAC in 1982 (K. Abe et al., Phys. Search for eta_c decays into pi pi and K Bar K. The electric charge Q of pions in units of the elementary charge e is equal to +1 for π … (b) What are the magnitudes of the momenta of the photons (c) How are they moving with respect to each other. A meson is made up of a quark and antiquark. A type of meson called the neutral kaon decays into two charged (+ and -) pions that are equal in mass. The electric charge Q of pions in units of the elementary charge e is equal to +1 for π … where a pi meson decays down to an electron and positron. Among the experimental results that will be presented are measurements of charm meson decay constants and semileptonic decays, non-DD decays of ψ(3770), and heavy quarkonium leptonic widths, masses and hadronic decays. One example of a meson is a pion (+), which is made of an up quark and a down anitiquark. 2000 Oct 09; 85(15):3095-9. meson decays about 50 per cent of the time into K + K. −. If there is such a particle Therefore it is forbidden. These results support the resonant substructure reported in the previously reported analysis of tau- -> pi0 pi0 pi- neutrino decay mode from the same CLEO II data sample. What is the frequency f of one of these photons when measured in the rest frame of the meson? The neutral pion, or pi meson, is a particle of mass mz = 135 MeV that decays into two photons through the reaction pi degree 2 gamma. It decays when this bare meson link spontaneously forms a second link that transforms it into a muon. Two photons approaching each other A further consequence, and indeed a requirement of special relativity, is the fact that the velocity of light in free space is constant. 2. A K 0 meson decays in flight into two pions, K 0--> π + + π-. (130 MeV) 12. ... aligned by two mirrors to go into a half-wave plate. Download PDF. Stack Exchange network consists of 177 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.. Visit Stack Exchange 4 K zero decays to a pi-minus and pi-plus via the weak interaction. 37 Full PDFs related to this paper. Phys. Search for eta_c decays into pi pi and K Bar K. 2005. The quark structure of the pion. (b) Given that the [latex]{\pi }^{0}[/latex] decays to two γ s and that the e + will find an electron to annihilate, what total energy is ultimately produced in proton decay? (a) what are the energies of the photons ? The structure-dependent part SDi of the amplitude describes the emission of photons from virtual A muon decays into an electron and an antineutrino. Such decay channels can be classified into two sets: (a) The \(B_c\) decays with an emitted scalar or tensor meson, which cannot be produced from the vacuum by the (axial-)vector current or (pseudo-)scalar density in the SM; and (b) the charmless hadronic \(B_c\) meson decays, which can only occur through the pure annihilation topology in the SM. For example, the proton is composed of two up quarks and a down quark (uud). Phys Rev Lett. In particle physics, a pion (or a pi meson, denoted with the Greek letter pi: π) is any of three subatomic particles: π0, π+, and π−. The energy of each photon in the laboratory system is 100 MeV. Meson decays The discussion of the decays of the light quark mesons is similar to that of the decays of the quarkonia. If a K meson at rest decays in 089 10 10 s how far will a K meson moving at 096 from PHYSICS 2012 at Temple University 5. lambda zero decays to a proton and a pi-minus via the weak interaction. Its second largest decay mode (1.198%) is the so-called Dalitz decay into a … … In other words, K mesons and (pi) mesons are not baryons (and have only two quarks) How can leptons interact to produce hadrons. The systematic undertainties are quite different than in previous indirect measurements. 24.11.20 - Search for nonresonant Higgs boson pair production in final states with two bottom quarks and two photons in proton-proton collisions at $\sqrt{s} = $ 13 TeV 11.11.20 - Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at $\sqrt{s} = $ 13 TeV Example: pi meson decay A pion has a rest energy of 135MeV. Pi mesons (pions) are a type of meson. "The impact of exotic compositions on the structure of isolated neutron stars has been studied in the past for stars composed of hyperons [1–9], Delta baryon resonances [10–14], meson condensates [15–21], quarks or even color superconducting quark matter [22–26]. The +/- pions are charged. Rev. Homework Statement:: How is it possible to find the energies of two photons from a moving pi-meson that has a given rest mass and kinetic energy. A neutral pion, π 0, will usually decay into two highly-energized photons. The bwo gluons hadronize into ordinary mesons or t,hey may form gluonium stat es, which consist in lowest order of two gluons. (Use the pion mass given in terms of the electron mass in Section 44.1.) These photons are directed in separate paths towards ... nm wavelength laser. Recently, radiative decays into two charged particles have been studied by the CLEO III collaboration [11]. ... (called a free neutron) and decays into a proton via the emission of an electron and an antineutrino. It decays into two gamma rays (photons). 6 a sigma plus decays to a proton and a pi-zero via the weak interaction. π+ are made up of one up quark and one anti-down quark. please show all working There are two types of hadrons: baryons and mesons. 8 xi-zero decays to a lambda zero and a pi … The π 0 meson has a slightly smaller mass of 135.0 MeV/c 2 and a much shorter mean life of 8.4×10 −17 seconds. π – almost always decays into one antimuon and one muon antineutrino. The weak interaction decays are more complex and have more possibilities. The experiment was carried out in the SPS accelerator at CERN. Old Man has no doubt that an uncharged, S = 1 vector meson exists. Find the energy, frequency, and wavelength of each photon. The energy of each photon in the laboratory system is 100 MeV. It requires two photons to conserve momentum. The neutral pi-meson (pi-naught or π 0) decays into two photons, one of which escapes from the bubble chamber while the other "converts internally" and appears in the bubble chamber as an e-e + pair coming from the collision point. The decay seemed to be a two-body decay, since all the lighter mesons had the same range. Outside the nucleus, mesons appear in nature only as short-lived products of very high-energy collisions between particles made of quarks, such as cosmic rays (high-energy protons 4 . What is... Ch. The interaction is sketched from the bubble chamber photograph. Composition: π + u d π 0 u u or d d Search for eta_c decays into pi pi and K Bar K. Video Transcript. Show author(s) ... B meson decays to charmless meson pairs containing eta or eta' mesons. View abstract Each pion consists of a quark and an antiquark and is therefore a meson. The pi-meson is a well known particle with a relativity long lifetime. meson spectrum was obtained from hadron-induced reac-tions, collisions, and studying the decays of various mesons, e.g. Homework Equations:: E' = E(sqrt{1+beta/1-beta}) TotalE{meson} = E{1} + E{2} Exclusive two body decays of the bottom meson Creator: Rodriguez, Jorge Luis Publication Date: 1995 Language: English Physical Description: xv, 214 leaves : ill. ; 29 cm. Limits on tau lepton-flavor violating decays into three charged leptons. . (The pi meson disappears after the decay.) ... A neutral pion decays into high energy photons. The We investigate the decays of \(\pi^0, \eta\) and \(\eta'\) into two photons in an effective U(3) chiral Lagrangian approach without employing large-\(N_{\rm c}\) arguments. Consider a neutral pi meson which decays into two photons: π0 → γ +γ. A specific search for the charmed D('0) meson decaying into a charged kaon and a charged rho (770MeV) meson is described. If the pion (whose rest mass is 135 MeV) is moving with a kinetic energy of 1 GeV: (a) What are the energies of the gamma rays if the decay process causes them to be emitted in opposite directions along the pion's original line of motion? >After the decay, one photon travels in the same direction as the = and the other photon travels in the opposite direction. Quantum ... two photons of identical polarization are produced: a signal photon and an idler photon. Measurements of the mass, total width, and two-photon partial width of the eta(c) meson. We have step-by-step solutions for your textbooks written by Bartleby experts! The analysis included a measurement of the decay rate into f 21270, a confirmation of its spin, and a measure-ment of its helicity distribution. (5 points) (b) A pi meson is observed to be moving in the laboratory so that its total relativistic energy Let the mass of each pion be m π and the mass of the K 0 be m K > 2m π. Pi meson decay* A neutral pi meson (π 0 ), rest mass 135 MeV, decays symmetrically into two photons while moving at high speed. In particle physics, a pion (or a pi meson, denoted with the Greek letter pi: ) is any of three subatomic particles: , , and .Each pion consists of a quark and an antiquark and is therefore a meson.Pions are the lightest mesons (and, more generally, the lightest hadrons), because they are composed of the lightest quarks (the u and d quarks).). 0. together with an emitted photon, it is rather natural to consider charged K-meson loop diagrams to describe the process. A pi−-meson and a proton, both at rest, interact to produce a neutron and a photon, π− +p → n+γ. Download Full PDF Package. It ought to decay predominantly into three or more photons. The two quarks that make up a pi meson can be a red quark and an anti-red (cyan) quark which add up to white. The K 0 decays into two pions as shown in the Feynman diagram. The U.S. Department of Energy's Office of Scientific and Technical Information The charge conjugation symmetry is conserved in the strong interaction. The three pion state has a mass very close to the kaon. π – almost always decays into one antimuon and one muon neutrino. Lett. In the case of the pi0, this is its primary decay mode with 98.8%of pi0 decays resulting in two photons [3]. FTP, identify this particle, the lightest meson. 37 Full PDFs related to this paper. The cuts ... and 12, and two nearby photons in the barrel Liquid Argon (LA) calorimeter) with ZE = 0.61 and pi = 1.98 GeV. It decays in the following way: (i) State, with a reason, what interaction is responsible for this decay. The CITATION: C. Patrignani et al. (ii) Explain how it may be deduced that this decay is a weak interaction process. The main decay mode, with probability 0.98798, is into two photons (two gamma ray photons in this case): The muon has charge -1, and elsewhere in the table you can find that the charge of the electron is -1 and of each of the neutrinos is 0. Search for eta_c decays into pi pi and K Bar K. 2005. A pion is a particle associated with the strong nuclear force that binds protons and neutrons together in the nucleus. If the decay of theπ0 is isotropic in its rest … muons and antineutrinos or antimuons and neutrinos. Therefore, in contrast to the electromagnetic interaction and to gravitation, both of which have an infinite range, … The isolation of positrons and electrons from charmed particle weak decays is presented elsewhere. Physical Review D. Particles and fields. A ∏° meson moving with a velocity v in the z direction decays into two photons. The almost non-existent secondary decay mode at lower branching energy, is when a positive pion decays into a … The two-dimensional plane m Kˇˇˇvs. Use the Minkowski diagram to show that they do not take place in the same time in frame S′. γ5)v(pℓ) is the lepton-neutrino current; q and k are the meson and photon four-momenta (k = p+ + p− for virtual photons); and P stands for π or K. The pion vector form factor, Vπ, is related via CVC (Conserved Vector Current) to the π0 → γγ decay width. This paper. 2000 Oct 02; 85(14):2881-5. 48,1526 (1982)). In this communication we discuss few topics related with modern experimental data on the physics of light pseudoscalar mesons. (obsolete) A member of a group of subatomic particles having a mass intermediate between electrons and protons. Using the SATURNE II proton beam and a liquid-deuterium target, the η mesons were produced in the reaction pd--> 3 He η at 1.5 MeV above threshold, and tagged by the detection of the recoil 3 He in the magnetic spectrometer SPES2. 1. 15 - A Σ0 particle at rest decays according to Find... Ch. For example, in the image below, we have been able to identify three vertices: PV, SV and TV, and associate them with particular events: PV – the production of an (B_s) meson, SV – the decay of the (B_s) meson into a muon and a (D_s) meson, and TV – the decay of the (D_s) meson into a (K) and two (pi… Muonus and antimuons. Two electrons, to generate the electromagnetic interaction, exchange photons (light quanta). Calculate the threshold energy for photo-production of pi-mesons according to the reaction γ +p → π+ +n. (i) State a reason why the kaon K 0 cannot be its own antiparticle. In the rocket frame in which the meson is at rest these pho- tons are emitted in the positive and negative y'-direc- … Therefore t,he study of radiative decays of heavy bound QQ states may provide insight int,o t,he formation mechanism and the gluonic content of light mesons. 12N.3.SL.TZ0.13b: The meson K0 consists of a d quark and an anti s quark. (150 MeV) 13. m, where m Kˇˇˇis the invariant mass of the D0 meson candidate, and m= m Kˇˇˇˇ slow m Kˇˇˇis mass di erence between the D(2010)+ and D0 meson candidates, is used to de ne signal and sideband regions with which to perform the amplitude analysis and study sources of background contamination. A particle called neutral pi meson (or pion) decays into two photons and nothing else. The J/ψ resonance, a spin-1 meson with mass 3096.900(6) MeV c –2 and decay width 92.9(28) keV (ref. A charged meson decays via the weak interaction, going to leptons. 45, num. Assuming that quantum numbers allow a two-photon decay, would be of the order keV for a ground-state meson, approxi-mately an order of magnitude smaller for a radial excita-tion [4], and of a vanishingly small value for a true glueball, because photons couple to gluons only through an intermediate quark loop. Photons at about 20 GeV were produced by Compton scattering of radiation from a YAG laser from energetic electrons from the linear accelerator. There are three different types of pions; π+, π-, and π0. Pion decays The neutral pion \(\pi^0\) is the lightest meson and therefore cannot decay into another meson. Since this final state can easily annihilate to produce either an f. 0. or a. Download PDF. (The most easily detected mesons fit this definition.) Abstract: Two-Body Dirac equations of constraint dynamics provide a covariant framework to investigate the problem of highly relativistic quarks in meson bound states. This paper. D70(2004)112003: Measurement of the chi_c2 polarization in psi'--> gamma chi_c2 The charmonium-like exotic states Y(4230) and the less known Y(4320), produced in e+e− collisions, are sources of positive parity exotic hadrons in association with photons or pseudoscalar mesons. Rev. Its antimatter twin, the L b 0-bar is composed of anti-up, anti-down, and anti-bottom quarks and similarly decays into p-p … Detection is most accurate for decay into two photons, but that mode of decay only happens 0.2-0.3% of the time. Every baryon is made up of three quarks and every meson is made of a quark and an antiquark. In which part of the electromagnetic spectrum does each photon lie? In compact form, mu- --> e- + antineutrino + neutrino. The pi-meson is more massive than a meson link because it acquired mass from the large amount of energy that it took to break it loose from the proton link. A short summary of this paper. A short summary of this paper. This formalism eliminates automatically the problems of relative time and energy, leading to a covariant three dimensional formalism with the same number of degrees of freedom as appears in the corresponding … Cosmic rays are high energy particles from the sun and other stars. version of this situation where a pi meson decays down to an electron and positron. A neutral pion, π 0, will usually decay into two highly-energized photons. A neutral pion at rest decays into two photons according to π0 →γ+γ. The two-dimensional plane m Kˇˇˇvs. Abstract. The lightest meson, the &pi meson (pion), limits the range of the strong interaction to about 1.4 x 10-15 meters, which is of the order of magnitude of the proton. Hadrons can be grouped into two main types. The Xi-decays almost exclusively into a Lambda and a pi-, whereas the Lambda decays about two-thirds of the time into a proton and a pi-, and about one-third of the time into a neutron and a pi o. 8 pages. tion observed. heavier meson decaying into the light one and something invisible. (a) What is the energy of each photon in the pi-zero rest frame? At the (4S) once such very useful tag is that of high momentum lepton as a bquark, part of a B 0 meson decays semileptonically into an -, while a b -quark decays into an e+. New data have been obtained on the scalar G(1590) meson which decays into an eta pair. When it decays, a small fraction of the time breaks up in a 4-particle process through the weak interaction, producing one proton (p+) and three p mesons, p + p-p + p-. Tree level and one-loop contributions from the anomalous Wess-Zumino-Witten Lagrangian are calculated and the importance of \(\eta\)-\(\eta'\) mixing is discussed.
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