CP violations in π<sup>±</sup>meson decay

Cvetič, Gorazd; Kim, C. S.; Zamora-Saá, Jilberto

doi:10.1088/0954-3899/41/7/075004

Cited by 50 publications

(98 citation statements)

References 54 publications

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“…This in turn, as demonstrated in Ref. [27], increases significantly the possible effects of CP violation.…”

Section: Introductionmentioning

confidence: 60%

“…In a recent work [27], we investigated the possibility of measuring the CP asymmetry in the rare leptonic decays of charged pions π ± → e ± e ± µ ∓ ν. Both lepton number conserving (LNC) and lepton number violating (LNV) processes contribute to these decays and to the CP violation.…”

Section: Introductionmentioning

confidence: 99%

“…This mechanism was presented in Ref. [27] and applied there to the CP violation of the rare leptonic decays of charged pions. 5 For example, when M ± = K ± and M ∓ = π ∓ , and we choose in numerical calculation Γ N ∼ 10 −3 GeV ∼ ∆M N , the Γ(DD * ) ij and Γ(CC * ) ij contributions are by about two orders of magnitude larger than the D-C interference contributions Γ ± (DC * ) ij .…”

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confidence: 99%

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CPviolation in lepton number violating semihadronic decays ofK,D,Ds,B,Bc

2014

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We study the CP violation in lepton number violating meson decays M ± → ±can become appreciable when two intermediate on-shell Majorana neutrinos Nj (j = 1, 2) participate in these decays. Our calculations show that the asymmetry becomes largest when the masses of N1 and N2 are almost degenerate, i.e., when the mass difference ∆MN becomes comparable with the (small) decay widths ΓN of these neutrinos: ∆MN ΓN . We show that in such a case, the CP ratio] becomes a quantity ∼ 1. The observation of CP violation in these decays would be consistent with the existence of the well-motivated νMSM model with two almost degenerate heavy neutrinos in the mass range between MN ∼ 0.1-10 1 GeV.

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“…This in turn, as demonstrated in Ref. [27], increases significantly the possible effects of CP violation.…”

Section: Introductionmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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CPviolation in lepton number violating semihadronic decays ofK,D,Ds,B,Bc

2014

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“…Here we focus on the decay K ± → π ∓ ± ± ( = e, µ), but the general procedure can be applied to decays of heavier mesons as well [28,29]. This decay can only be mediated by Majorana particles, so its sole observation would be evidence of their Majorana character.…”

Section: Jhep02(2015)108mentioning

confidence: 99%

CP violation with Majorana neutrinos in K meson decays

Dib

Campos

Kim

2015

J. High Energ. Phys.

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Abstract:We study the possibility of having CP asymmetries in the decay K ± → π ∓ ± ± ( = e, µ). This decay violates Lepton Number by two units and occurs only if there are Majorana particles that mediate the transition. Even though the absolute rate is highly suppressed by current bounds, we search for Majorana neutrino scenarios where the CP asymmetry arising from the lepton sector could be sizeable. This is indeed the case if there are two or more Majorana neutrinos with similar masses in the range around 10 2 MeV. In particular, the asymmetry is potentially near unity if two neutrinos are nearly degenerate, in the sense ∆m N ∼ Γ N . The full decay, however, may be difficult to detect not only because of the suppression caused by the heavy-to-light lepton mixing, but also because of the long lifetime of the heavy neutrino, which would induce large space separation between the two vertices where the charge leptons are produced. This particular problem should be less serious in heavier meson decays, as they involve heavier neutrinos with shorter lifetimes.

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“…However, from the viewpoint of testing the SM the weak charged pion decays are extremely clean and theory runs well ahead of experimentally achieved precision. The PIENU experiment has also been used to constrain the possibility of contributions of heavy neutrinos to their decays [83] and more pion decay measurements (not necessarily with low momentum pions) have been suggested to search for heavy neutrinos, LF and even CP violation [84,85]. Other limits on exotic physics in π 0 decays have been obtained, e.g.…”

Section: Experiments With Pionsmentioning

confidence: 99%

The Virtue of Precision Particle Physics

Kirch

2015

Proceedings of the 2nd International Symposium on Science at J-Parc — Unlocking the Mysteries of Life, Matter and the Universe

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Precision studies and tests of fundamental interactions and symmetries are a focus point of modern particle physics. With the success of the present Standard Model (SM) of particle physics and simultaneously with the need for new physics to fix known deficiencies a broad search program is under way to probe at all energy scales for the unknown. Precision measurements of quantities which can be accurately predicted in the SM and also especially those which are predicted to be null or negligibly small turn out to provide some of the most stringent constraints for many new physics scenarios. Besides some detours, this paper concentrates on precision physics using neutrons, pions and muons, the lightest unstable particles of their kind, produced at the most powerful proton accelerators.KEYWORDS: precision particle physics, symmetry, lepton flavor, charge parity, dipole moment, weak interaction, rare decay, exotic atom, spectroscopy Setting the sceneComplementarity is a buzz word in today's research. Here it is used to describe the relation between the direct production of new particles and observations of virtual contributions from such particles. Direct production of new heavy particles and resonances and their detection through their decays is the realm of high energy collider particle physics. The recent discovery of a Higgs boson [1,2] displaying so far all features expected for the Standard Model (SM) Higgs is the latest discovery and triumph of this successful line of research. Indeed, the careful investigation of this Higg's particle properties (see, e.g. [3]) and the continued search for possible new particles with larger masses is the ongoing high priority program at CERN's LHC which will resume operation at higher energy soon.The broader look at 'fundamental physics in the era of LHC' has identified many complementary efforts and established the case and the need for a program at the high intensity, low energy, precision physics frontier, e.g. [4][5][6]. The observation of indirect, short distance effects of virtual particles becomes possible in the comparison of precision measurements and precision theoretical predictions. As it turns out, many of these experiments at low energy probe physics at considerably higher energy scale than direct collider searches, often multi-TeV or even 1000 TeV.Some finite observables allow, both, very precise and accurate experimental determinations and very precise and accurate, often multi-loop, calculations within the SM or some of its extensions. Prime examples for these observables are the anomalous magnetic moments a e/µ = (g − 2)/2 of the electron [7] and the muon [8,9]. For instance, the best determination today of the fine structure constant α relies on the a e measurement and a high precision QED calculation [10]. Likewise, the electron mass [11] is obtained by comparing a high precision quantum jump spectroscopy measurement in a Penning trap with a high precision calculation of the bound electron g-factor. More examples can be easily found, as the extraction of fu...

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CP violations in π^±meson decay

Cited by 50 publications

References 54 publications

CPviolation in lepton number violating semihadronic decays ofK,D,Ds,B,Bc

CPviolation in lepton number violating semihadronic decays ofK,D,Ds,B,Bc

CP violation with Majorana neutrinos in K meson decays

The Virtue of Precision Particle Physics

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CP violations in π±meson decay

Cited by 50 publications

References 54 publications

CPviolation in lepton number violating semihadronic decays ofK,D,Ds,B,Bc

CPviolation in lepton number violating semihadronic decays ofK,D,Ds,B,Bc

CP violation with Majorana neutrinos in K meson decays

The Virtue of Precision Particle Physics

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CP violations in π^±meson decay