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TL;DR: The Mu2e experiment at Fermilab will search for charged lepton flavor violation via the coherent conversion process with a sensitivity approximately four orders of magnitude better than the current world's best limits for this process.
Abstract: Author(s): Project, The Mu2e; Collaboration; Abrams, RJ; Alezander, D; Ambrosio, G; Andreev, N; Ankenbrandt, CM; Asner, DM; Arnold, D; Artikov, A; Barnes, E; Bartoszek, L; Bernstein, RH; Biery, K; Biliyar, V; Bonicalzi, R; Bossert, R; Bowden, M; Brandt, J; Brown, DN; Budagov, J; Buehler, M; Burov, A; Carcagno, R; Carey, RM; Carosi, R; Cascella, M; Cauz, D; Cervelli, F; Chandra, A; Chang, JK; Cheng, C; Ciambrone, P; Coleman, RN; Cooper, M; Corcoran, MC; Cordelli, M; Davydov, Y; Gouvea, AL de; Lorenzis, L De; Debevec, PT; DeJongh, F; Densham, C; Deuerling, G; Dey, J; Falco, S Di; Dixon, S; Djilkibaev, R; Drendel, B; Dukes, EC; Dychkant, A; Echenard, B; Ehrlich, R; Evans, N; Evbota, D; Fang, I; Fast, JE; Feher, S; Fischler, M; Frank, M; Frlez, E; Fung, SS; Gallo, G; Galucci, G; Gaponenko, A; Genser, K; Giovannella, S; Glagolev, V; Glenzinski, D; Gnani, D; Goadhouse, S; Gollin, GD; Grace, C; Grancagnolo, F; Group, C; Hanson, J; Hanson, S; Happacher, F; Heckmaier, E; Hedin, D; Hertzog, DW; Hirosky, R; Hitlin, DG; Ho, E; Huang, X | Abstract: Mu2e at Fermilab will search for charged lepton flavor violation via the coherent conversion process mu- N --g e- N with a sensitivity approximately four orders of magnitude better than the current world's best limits for this process. The experiment's sensitivity offers discovery potential over a wide array of new physics models and probes mass scales well beyond the reach of the LHC. We describe herein the conceptual design of the proposed Mu2e experiment. This document was created in partial fulfillment of the requirements necessary to obtain DOE CD-1 approval, which was granted July 11, 2012.
114 citations
TL;DR: Mu2e-II as discussed by the authors proposes an evolution of the Mu2e experiment, which would leverage advances in detector technology and utilize the increased proton intensity provided by the Fermilab PIP-II upgrade to improve the sensitivity for neutrinoless muon-to-electron conversion.
Abstract: We propose an evolution of the Mu2e experiment, called Mu2e-II, that would leverage advances in detector technology and utilize the increased proton intensity provided by the Fermilab PIP-II upgrade to improve the sensitivity for neutrinoless muon-to-electron conversion by one order of magnitude beyond the Mu2e experiment, providing the deepest probe of charged lepton flavor violation in the foreseeable future Mu2e-II will use as much of the Mu2e infrastructure as possible, providing, where required, improvements to the Mu2e apparatus to accommodate the increased beam intensity and cope with the accompanying increase in backgrounds
40 citations
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TL;DR: In this paper, the feasibility of a next-generation Mu2e experiment using Project-X beams was explored, which achieved a sensitivity approximately a factor ten better than the currently planned Mu2E facility.
Abstract: We explore the feasibility of a next-generation Mu2e experiment that uses Project-X beams to achieve a sensitivity approximately a factor ten better than the currently planned Mu2e facility.
28 citations
TL;DR: In this article, a conceptual design for the magnetic system which meets the Fermilab Mu2e experiment requirements is presented, where the magnetic field requirements, the significant magnetic coupling between the solenoids, the curved muon transport geometry and the large beam induced energy deposition into the superconducting coils pose significant challenges to the magnetic, mechanical and thermal design of this system.
Abstract: The Fermilab Mu2e experiment seeks to measure the rare process of direct muon to electron conversion in the field of a nucleus. Key to the design of the experiment is a system of three superconducting solenoids; a muon production solenoid (PS) which is a 1.8 m aperture axially graded solenoid with a peak field of 5 T used to focus secondary pions and muons from a production target located in the solenoid aperture; an “S shaped” transport solenoid (TS) which selects and transports the subsequent muons towards a stopping target; a detector solenoid (DS) which is an axially graded solenoid at the upstream end to focus transported muons to a stopping target, and a spectrometer solenoid at the downstream end to accurately measure the momentum of the outgoing conversion electrons. The magnetic field requirements, the significant magnetic coupling between the solenoids, the curved muon transport geometry and the large beam induced energy deposition into the superconducting coils pose significant challenges to the magnetic, mechanical, and thermal design of this system. In this paper a conceptual design for the magnetic system which meets the Mu2e experiment requirements is presented.
20 citations
TL;DR: In this article, the conceptual design of the Transport Solenoid is presented and discussed focusing on coupling issues and the proposed solutions, and the quench protection system should handle all possible quench and failure scenarios in all three solenoids.
Abstract: The Fermilab Mu2e experiment seeks to measure the rare process of direct muon to electron conversion in the field of a nucleus. The magnet system for this experiment is made of three warm-bore solenoids: the Production Solenoid (PS), the Transport Solenoid (TS), and the Detector Solenoid (DS). The TS is an “S-shaped” solenoid set between the other bigger solenoids. The Transport Solenoid has a warm-bore aperture of 0.5 m and field between 2.5 and 2.0 T. The PS and DS have, respectively warm-bore aperture of 1.5 m and 1.9 m, and peak field of 4.6 T and 2 T. In order to meet the field specifications, the TS starts inside the PS and ends inside the DS. The strong coupling with the adjacent solenoids poses several challenges to the design and operation of the Transport Solenoid. The coil layout has to compensate for the fringe field of the adjacent solenoids. The quench protection system should handle all possible quench and failure scenarios in all three solenoids. The support system has to be able to withstand very different forces depending on the powering status of the adjacent solenoids. In this paper, the conceptual design of the Transport Solenoid is presented and discussed focusing on these coupling issues and the proposed solutions.
15 citations
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TL;DR: In this article, a comprehensive review of physics effects generated by leptoquarks (LQs), i.e., hypothetical particles that can turn quarks into leptons and vice versa, of either scalar or vector nature, is presented.
464 citations
TL;DR: In this article, the authors review recent progress in the phenomenology of RH neutrinos and discuss the mass ranges suggested by hints for neutrino oscillation anomalies and DR (eV), sterile NE DM scenarios (keV) and experimentally testable theories of baryogenesis (GeV to TeV).
Abstract: Neutrinos are the only particles in the Standard Model (SM) of particle physics that have only been observed with left handed chirality to date. If right handed (RH) neutrinos exist, they could be responsible for several phenomena that have no explanation within the SM, including neutrino oscillations, the baryon asymmetry of the universe, dark matter (DM) and dark radiation (DR). After a pedagogical introduction, we review recent progress in the phenomenology of RH neutrinos. We in particular discuss the mass ranges suggested by hints for neutrino oscillation anomalies and DR (eV), sterile neutrino DM scenarios (keV) and experimentally testable theories of baryogenesis (GeV to TeV). We summarize constraints from theoretical considerations, laboratory experiments, astrophysics and cosmology for each of these.
365 citations
TL;DR: In this article, the authors overview the current status of τ physics, highlighting the most recent developments, and discuss the prospects for future improvements, as well as discuss the potential of future improvements.
307 citations
TL;DR: In this article, a global fit of the Minimal Unitarity Violation (MUV) scheme parameters to the present experimental data is performed, which yields the up-to-date constraints on leptonic non-unitarity.
Abstract: The non-unitarity of the effective leptonic mixing matrix at low energies is a generic signal of extensions of the Standard Model (SM) with extra fermionic singlet particles, i.e. “sterile” or “right-handed” neutrinos, to account for the observed neutrino masses. The low energy effects of such extensions can be described in a model-independent way by the Minimal Unitarity Violation (MUV) scheme, an effective field theory extension of the SM. We perform a global fit of the MUV scheme parameters to the present experimental data, which yields the up-to-date constraints on leptonic non-unitarity. Furthermore, we investigate the sensitivities and discovery prospects of future experiments. In particular, FCC-ee/TLEP would be a powerful probe of flavour-conserving non-unitarity for singlet masses up to ∼60 TeV. Regarding flavour-violating non-unitarity, future experiments on muon-to-electron conversion in nuclei could even probe extensions with singlet masses up to ∼0.3 PeV.
299 citations
TL;DR: The Mu2e experiment at Fermilab will search for charged lepton flavor violation via the coherent conversion process with a sensitivity approximately four orders of magnitude better than the current world's best limits for this process as discussed by the authors.
Abstract: Author(s): Bartoszek, L; et al. | Abstract: The Mu2e experiment at Fermilab will search for charged lepton flavor violation via the coherent conversion process mu- N --g e- N with a sensitivity approximately four orders of magnitude better than the current world's best limits for this process. The experiment's sensitivity offers discovery potential over a wide array of new physics models and probes mass scales well beyond the reach of the LHC. We describe herein the preliminary design of the proposed Mu2e experiment. This document was created in partial fulfillment of the requirements necessary to obtain DOE CD-2 approval.
228 citations