Expression of Interest for Evolution of the Mu2e Experiment

F., Abusalma,; Ambrose, D. J.; Artikov, A.; Bernstein, R. H.; Blazey, G.; Bloise, C.; Boi, S.; Bolton, T.; Bono, J.; Bonventre, R.; Bowring, D.; Brown, D. N.; Byrum, K.; Campbell, M.; Caron, Jean‐François; Cervelli, F.; Chokheli, D.; Kate, Ciampa,; Ciolini, Riccardo; Coleman, R.; Cronin-Hennessy, D.; Culbertson, R.; Cummings, M. A.C.; Daniel, A.; Davydov, Yu. I.; Demers, S.; Denisov, D.; Denisov, Serguei; Falco, S. Di; Diociaiuti, E.; Djilkibaev, R.; Donati, S.; Donghia, R.; Drake, G.; Dukes, E. C.; Echenard, B.; Edmonds, Andrew; Ehrlich, R.; Евдокимов, В. Н.; Fabbricatore, P.; Ferrari, A.; Frank, M. J.; Gaponenko, A.; Gatto, C.; Z., Giorgio,; Giovannella, S.; Giusti, Valerio; Glass, H.; Glenzinskí, D.; Goodenough, L.; Happacher, F.; Harkness-Brennan, L. J.; Hedin, D.; Heller, K.; Hitlin, D. G.; Höcker, A.; Hooper, R.; Horton-Smith, G. A.; Hu, C.; Hung, P. Q.; Hungerford, E.; Jenkins, M.; Jones, M.; Kargiantoulakis, M.; Khaw, Kim Siang; Kiburg, B.; Kolomensky, Yu. G.; Kozminski, J.; Kutschke, R.; Lancaster, M.; Lin, D. X.; Logashenko, I.B.; Lombardo, V.; Lucà, A.; Lukicov, Gleb; Lynch, Kevin R.; Martini, M.; Mazzacane, A.; Miller, J.; Miscetti, S.; Morescalchi, L.; Mott, J.; Mueller, S.; Murat, P.; Nagaslaev, V.; Neuffer, D.; Oksuzian, Y.; Pasciuto, D.; Pedreschi, E.; Pezzullo, G.; Pla‐Dalmau, A.; Pollack, B.; Попов, А. С.; Popp, J.; Porter, F. C.; Prebys, E.; Pronskikh, Vitaly; Pushka, D.; Quirk, John; Rakness, G.; Ray, R. E.; Ricci, M.; Röhrken, M.; Rusu, V.; Saputi, A.; Sarra, I.; Schmitt, M.; Spinella, F.; Stratakis, Diktys; Strauss, T.; Talaga, R. L.; Терещенко, В.; Tran, N. H.; Tschirhart, R.; Usubov, Z.; Velasco, M.; Wagner, R. L.; Wang, Y.; Werkema, S.; Whitmore, J. J.; Winter, P.; Xia, L.; Zhang, L.; Zhu, R. Y.; Zutshi, V.; Zwaska, R.

doi:10.2172/1462226

Cited by 37 publications

(35 citation statements)

References 11 publications

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“…The Mu2e will reach sufficient sensitivity to cover the entirety of the large PMNS-like mixing parameter space for both the NSH and ISH cases with the titanium target upgrade. The proposed Mu2e-II upgrade envisions to improve the sensitivity by an order of magnitude, CR(µ + Al → e + Al) ∼ 2.5 × 10 −18 [61] which is still not quite sufficient to cover the whole CKM-like mixing scenario with ISH.…”

Section: µ → E Conversion In Nucleimentioning

confidence: 99%

Lepton flavor violation from SUSY with nonuniversal scalars

Baer

Barger

Serce

2019

Phys. Rev. Research

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Right-handed neutrinos in supersymmetric models can act as the source of lepton flavor violation (LFV). We present experimental implications of lepton flavor-violating processes within a supersymmetric type-I seesaw framework in the three-extra-parameter non-universal Higgs model (NUHM3) for large (PMNS-like) and small (CKM-like) Yukawa mixing scenarios. We highlight LFV predictions for the natural (low ∆ EW ) portion of parameter space. Our numerical analysis includes full 2-loop renormalization group running effects for the three neutrino masses and mass matrices. We show the projected discovery reach of various LFV experiments (i.e. Mu2e, Mu3e, MEG-II, Belle-II), and specify regions that have already been excluded by the LHC searches. Our results depend strongly on whether one has a normal sneutrino hierarchy (NSH) or an inverted sneutrino hierarchy (ISH). Natural SUSY with a NSH is already excluded by MEG-2013 results while large portions of ISH have been or will soon be tested. However, LFV processes from natural SUSY with small Yukawa mixing and an ISH seem below any projected sensitivities. A substantial amount of the remaining parameter space of models with large PMNS-like sneutrino mixing will be probed by Mu2e and MEG-II experiments whereas small, CKM-like Yukawa mixing predicts LFV decays which can hide from LFV experiments. *

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Section: µ → E Conversion In Nucleimentioning

confidence: 99%

Lepton flavor violation from SUSY with nonuniversal scalars

Baer

Barger

Serce

2019

Phys. Rev. Research

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“…A series of measurements were made ( [26] and references therein) on heavy targets, but the data are limited: there are no data past about 119 degrees from the forward (initial proton) direction, and no real model with which to perform an extrapolation. While Mu2e believes this background is under control, upgrades to the experiment that run at lower energy (∼1-3 GeV, for example, at FNAL's PIP-II) belowp production threshold would eliminate the problem [27].…”

Section: Other Backgroundsmentioning

confidence: 99%

“…The uncertainties from the models of muon production and of the transmission through the solenoid are hard to estimate: a direct measurement is better. Mu2e will use the Xrays emitted as a stopped muon falls into a 1 s muonic state (206 times closer than the electron's Bohr radius: for 27 Al 13 , about 19 fm compared to the nuclear radius of ∼ 4 fm). Muon-toelectron conversion can occur from higher states and can also occur incoherently [33] but both effects are small.…”

Section: The Mu2e Stopping Target Monitor: Measuring the Denominatormentioning

confidence: 99%

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The Mu2e Experiment

Bernstein

2019

Front. Phys.

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The Mu2e experiment will search for the charged-lepton flavor violating (CLFV) neutrino-less conversion of a negative muon into an electron in the field of a nucleus. The conversion process results in a monochromatic electron with an energy of 104.97 MeV, slightly below the muon rest mass. The goal of the experiment is to improve the previous upper limit by four orders of magnitude and reach a SES (single event sensitivity) of 3 × 10 −17 on the conversion rate, a 90% CL of 8 × 10 −17 , and a 5σ discovery reach at 2 × 10 −16 . The experiment will use a intense pulsed negative muon beam. The pulsed beam is essential to reducing backgrounds. The other essential element is a sophisticated magnetic system composed of three consecutive solenoids that form the muon beam. Mu2e will use an aluminum target and examine ∼ 10 18 stopped muons in 3 years of running. The Mu2e experiment is under design and construction at the Fermilab Muon Campus. The experiment will begin operations in 2022, and will require about 3 years of data-taking. Upgrades to other materials than aluminum are already being planned. This article is written specifically for younger researchers to bridge the gap between conference presentations and detailed design reports, and examines issues not covered in the former without the details of the latter.

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“…On the long term, and for Titanium targets, Mu2e-II[140] is expected to improve the sensitivity by a factor of ten…”

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confidence: 99%

A nonunitary interpretation for a single vector leptoquark combined explanation to the B-decay anomalies

Hati

Kriewald

Orloff

et al. 2019

J. High Energ. Phys.

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In order to simultaneously account for both R D ( * ) and R K ( * ) anomalies in B-decays, we consider an extension of the Standard Model by a single vector leptoquark field, and study how one can achieve the required lepton flavour non-universality, starting from a priori universal gauge couplings. While the unitary quark-lepton mixing induced by SU (2) L breaking is insufficient, we find that effectively nonunitary mixings hold the key to simultaneously address the R K ( * ) and R D ( * ) anomalies. As an intermediate step towards various UV-complete models, we show that the mixings of charged leptons with additional vector-like heavy leptons successfully provide a nonunitary framework to explain R K ( * ) and R D ( * ) . These realisations have a strong impact for electroweak precision observables and for flavour violating ones: isosinglet heavy lepton realisations are already excluded due to excessive contributions to lepton flavour violating Z-decays. Furthermore, in the near future, the expected progress in the sensitivity of charged lepton flavour violation experiments should allow to fully probe this class of vector leptoquark models.

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Expression of Interest for Evolution of the Mu2e Experiment

Cited by 37 publications

References 11 publications

Lepton flavor violation from SUSY with nonuniversal scalars

Lepton flavor violation from SUSY with nonuniversal scalars

The Mu2e Experiment

A nonunitary interpretation for a single vector leptoquark combined explanation to the B-decay anomalies

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