Searching for new physics at μ → e facilities with μ + and π + decays at rest

Hill, Richard J.; Plestid, Ryan; Zupan, Jure

doi:10.1103/PhysRevD.109.035025

Title: Searching for new physics at $μ \to e$ facilities with $μ^{+}$ and $π^{+}$ decays at rest

Abstract

We investigate the ability of μ → e facilities, Mu2e and COMET, to probe, or discover, new physics with their detector validation datasets. The validation of the detector response may be performed using a dedicated run with μ⁺, collecting data below the Michel edge, E_e ≲ 52 MeV; an alternative strategy using π⁺ → e⁺ν_e may also be considered. We focus primarily on a search for a monoenergetic e⁺ produced via two-body decays μ⁺ → e⁺X or π⁺ → e⁺X, with X a light new physics particle. Mu2e can potentially explore new parameter space beyond present astrophysical and laboratory constraints for a set of well motivated models including axionlike particles with flavor violating couplings (μ⁺ → e⁺a), massive Z' bosons (μ⁺ → Z'e⁺), and heavy neutral leptons (π⁺→e⁺N). The projected sensitivities presented herein can be achieved in a matter of days.

Authors:

;

; Zupan, Jure

Publication Date:: Wed Feb 28 00:00:00 EST 2024

Research Org.:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); Walter Burke Institute

OSTI Identifier:: 2315721

Alternate Identifier(s):: OSTI ID: 2202825

Report Number(s):: FERMILAB-PUB-23-287-T; CALT-TH/2023-017; arXiv:2310.00043
Journal ID: ISSN 2470-0010; PRVDAQ; 035025

Grant/Contract Number:: SC0011784; SC1019775; AC02-07CH11359; SC0019095; SC0011632; OAC-2103889; PHY-1748958; PHY-1607611

Resource Type:: Published Article

Journal Name:: Physical Review. D.

Additional Journal Information:: Journal Name: Physical Review. D. Journal Volume: 109 Journal Issue: 3; Journal ID: ISSN 2470-0010

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; particle delays; axions; heavy neutrinos; muons; pions

Citation Formats


                    Hill, Richard J., Plestid, Ryan, and Zupan, Jure. Searching for new physics at μ → e facilities with μ + and π + decays at rest.  United States: N. p., 2024. 
Web.  doi:10.1103/PhysRevD.109.035025.

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                    Hill, Richard J., Plestid, Ryan, & Zupan, Jure. Searching for new physics at μ → e facilities with μ + and π + decays at rest.  United States.  https://doi.org/10.1103/PhysRevD.109.035025

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                    Hill, Richard J., Plestid, Ryan, and Zupan, Jure. Wed .  
"Searching for new physics at μ → e facilities with μ + and π + decays at rest".  United States.  https://doi.org/10.1103/PhysRevD.109.035025.

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@article{osti_2315721,

  title        = {Searching for new physics at μ → e facilities with μ + and π + decays at rest},

  author       = {Hill, Richard J. and Plestid, Ryan and Zupan, Jure},

  abstractNote = {We investigate the ability of μ → e facilities, Mu2e and COMET, to probe, or discover, new physics with their detector validation datasets. The validation of the detector response may be performed using a dedicated run with μ+, collecting data below the Michel edge, Ee ≲ 52 MeV; an alternative strategy using π+ → e+νe may also be considered. We focus primarily on a search for a monoenergetic e+ produced via two-body decays μ+ → e+X or π+ → e+X, with X a light new physics particle. Mu2e can potentially explore new parameter space beyond present astrophysical and laboratory constraints for a set of well motivated models including axionlike particles with flavor violating couplings (μ+ → e+a), massive Z' bosons (μ+ → Z'e+), and heavy neutral leptons (π+→e+N). The projected sensitivities presented herein can be achieved in a matter of days.},

  doi          = {10.1103/PhysRevD.109.035025},

  journal      = {Physical Review. D.},

  number       = 3,

  volume       = 109,

  place        = {United States},

  year         = {Wed Feb 28 00:00:00 EST 2024},

  month        = {Wed Feb 28 00:00:00 EST 2024}

}

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Search for lepton flavor violating <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msup><mml:mi>τ</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> decays into <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msup><mml:mi>ℓ</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mi>η</mml:mi></mml:math>, <mml:math altimg="si3.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msup><mml:mi>ℓ</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msup><mml:mi>η</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math> and <mml:math altimg="si4.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msup><mml:mi>ℓ</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>
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Charged lepton flavor violation at the EIC journal, March 2021

The dark L − L rises via kinetic mixing journal, September 2018

Can confinement ensure natural CP invariance of strong interactions? journal, April 1980

Improved Limit on the Branching Ratio of μ → e Conversion on Lead journal, January 1996

Constraints on sterile neutrinos in the MeV to GeV mass range journal, October 2019

Search for the light dark matter with an X-ray spectrometer journal, November 2007

Detecting light boson dark matter through conversion into a magnon journal, May 2020

Higgs mediated CLFV processes μN ( eN )→ τX via gluon operators journal, September 2017

Search for rare muon decays with the Crystal Box detector journal, October 1988

A simple solution to the strong CP problem with a harmless axion journal, August 1981

Axion to magnon conversion. A scheme for the detection of galactic axions journal, August 1989

Improved constraints on sterile neutrinos in the MeV to GeV mass range journal, September 2019

High-precision muon decay predictions for ALP searches journal, July 2023

Reaction μ − + Nucleus → e − + Nucleus in Gauge Theories journal, June 1977

Muon decay in orbit journal, July 1974

Low-scale standard supersymmetric leptogenesis journal, March 2005

μ→eγ at a rate of one out of 109 muon decays? journal, April 1977

Flaxion: a minimal extension to solve puzzles in the standard model journal, January 2017

The electron energy spectrum in muon decay through 𝒪(α2) journal, September 2007

The giant dipole resonance in light nuclei and related phenomena journal, April 1986

Search for Majoron at the COMET experiment* journal, January 2023

A realistic U(2) model of flavor journal, August 2018

Lepton flavor violating Z′ explanation of the muon anomalous magnetic moment journal, November 2016

SEARCHING FOR keV STERILE NEUTRINO DARK MATTER WITH X-RAY MICROCALORIMETER SOUNDING ROCKETS journal, November 2015

Flavor from the double tetrahedral group without supersymmetry: Flavorful axions and neutrinos journal, August 2019

Luminous solar neutrinos. I. Dipole portals journal, October 2021

Luminous solar neutrinos. II. Mass-mixing portals journal, October 2021

On axion and familons journal, April 1987

Search for Admixtures of Massive Neutrinos in the Decayπ+→μ++ν¯ journal, March 1984

Constraints on Massive Neutrinos inπ→eνDecay journal, May 1986

MUonE sensitivity to new physics explanations of the muon anomalous magnetic moment journal, May 2020

Erratum to: “The effective Lagrangian for the seesaw model of neutrino mass and leptogenesis” [Phys. Lett. B 552 (2003) 177] journal, May 2006

New constraints on heavy neutral leptons from Super-Kamiokande data journal, March 2020

Physics beyond colliders at CERN: beyond the Standard Model working group report journal, December 2019

General theory of weak processes involving neutrinos. II. Pure leptonic decays journal, September 1981

Search for the Muon-Number-Nonconserving Decayμ→e+e+e− journal, October 1984

Michel decay spectrum for a muon bound to a nucleus journal, November 2014

Feebly-interacting particles: FIPs 2020 workshop report journal, November 2021

Phenomenology of GeV-scale heavy neutral leptons journal, November 2018

COMET Phase-I technical design report journal, March 2020

Search for Lepton Flavor Violating Decays τ ± → ℓ ± π 0 , ℓ ± η , ℓ ± η ′ journal, February 2007

Neutrino decay and spontaneous violation of lepton number journal, February 1982

Improved limit on the branching ratio of μ−→e+ conversion on titanium journal, March 1998

The Phenomenology of Right Handed Neutrinos journal, August 2013

Search for right-handed currents in muon decay journal, October 1986

The effective Lagrangian for the seesaw model of neutrino mass and leptogenesis journal, January 2003

Muon decay and physics beyond the standard model journal, January 2001

On the IR/UV flavour connection in non-universal axion models journal, June 2023

Can the family group be a global symmetry? journal, September 1982

Astrophysical and terrestrial constraints on singlet Majoron models journal, March 1994

Gauging lepton flavor SU(3) for the muon g − 2 journal, March 2022

Search for Invisible Axion Dark Matter with the Axion Dark Matter Experiment journal, April 2018

Review of Particle Physics journal, August 2022

Search for the decay μ+ → e+e+e− journal, March 1988

Muon conversion to electron in nuclei in type-I seesaw models journal, January 2013

Erratum: Detailed calculation of lepton flavor violating muon-electron conversion rate for various nuclei [Phys. Rev. D 66 , 096002 (2002)] journal, September 2007

Dipole portal to heavy neutral leptons journal, December 2018

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos journal, March 2020

Muon decay spectrum: Leading logarithmic approximation journal, June 2002

Search for the decay μ+ → e+e+e− journal, October 1985

Right-handed neutrinos at CERN LHC and the mechanism of neutrino mass generation journal, October 2007

The minimal flavour violating axion journal, October 2017

Limits on Axion Couplings from the First 80 Days of Data of the PandaX-II Experiment journal, November 2017

The Search for Feebly Interacting Particles journal, September 2021

Higher order QED corrections to muon decay spectrum journal, March 2003

Title: Searching for new physics at $μ \to e$ facilities with $μ^{+}$ and $π^{+}$ decays at rest

Charged lepton flavor violation: An experimenter’s guide
journal, November 2013

How to find neutral leptons of the νMSM?
journal, October 2007

Searching for galactic axions through magnetized media: The QUAX proposal
journal, March 2017

Flavor probes of axion-like particles
journal, September 2022

Lepton-flavor violating axions at MEG II
journal, October 2022

Exploring portals to a hidden sector through fixed targets
journal, November 2009

Piezoelectrically Tuned Multimode Cavity Search for Axion Dark Matter
journal, December 2018

Global constraints on a heavy neutrino
journal, February 2016

Cosmology of the invisible axion
journal, January 1983

Topological susceptibility and QCD axion mass: QED and NNLO corrections
journal, March 2019

Search for an admixture of heavy neutrino states in pion decay
journal, October 1981

Model for a light Z ’ boson
journal, October 1994

Charged lepton flavor violation at the EIC
journal, March 2021

The dark L − L rises via kinetic mixing
journal, September 2018

Can confinement ensure natural CP invariance of strong interactions?
journal, April 1980

Improved Limit on the Branching Ratio of μ → e Conversion on Lead
journal, January 1996

Constraints on sterile neutrinos in the MeV to GeV mass range
journal, October 2019

Search for the light dark matter with an X-ray spectrometer
journal, November 2007

Detecting light boson dark matter through conversion into a magnon
journal, May 2020

Higgs mediated CLFV processes μN ( eN )→ τX via gluon operators
journal, September 2017

Search for rare muon decays with the Crystal Box detector
journal, October 1988

A simple solution to the strong CP problem with a harmless axion
journal, August 1981

Axion to magnon conversion. A scheme for the detection of galactic axions
journal, August 1989

Improved constraints on sterile neutrinos in the MeV to GeV mass range
journal, September 2019

High-precision muon decay predictions for ALP searches
journal, July 2023

Reaction $μ^{-} + Nucleus \to e^{-} + Nucleus$ in Gauge Theories
journal, June 1977

Muon decay in orbit
journal, July 1974

Low-scale standard supersymmetric leptogenesis
journal, March 2005

μ→eγ at a rate of one out of 109 muon decays?
journal, April 1977

Flaxion: a minimal extension to solve puzzles in the standard model
journal, January 2017

The electron energy spectrum in muon decay through 𝒪(α²)
journal, September 2007

The giant dipole resonance in light nuclei and related phenomena
journal, April 1986

Search for Majoron at the COMET experiment*
journal, January 2023

A realistic U(2) model of flavor
journal, August 2018

Lepton flavor violating Z′ explanation of the muon anomalous magnetic moment
journal, November 2016

SEARCHING FOR keV STERILE NEUTRINO DARK MATTER WITH X-RAY MICROCALORIMETER SOUNDING ROCKETS
journal, November 2015

Flavor from the double tetrahedral group without supersymmetry: Flavorful axions and neutrinos
journal, August 2019

Luminous solar neutrinos. I. Dipole portals
journal, October 2021

Luminous solar neutrinos. II. Mass-mixing portals
journal, October 2021

On axion and familons
journal, April 1987

Search for Admixtures of Massive Neutrinos in the Decayπ+→μ++ν¯
journal, March 1984

Constraints on Massive Neutrinos inπ→eνDecay
journal, May 1986

MUonE sensitivity to new physics explanations of the muon anomalous magnetic moment
journal, May 2020

Erratum to: “The effective Lagrangian for the seesaw model of neutrino mass and leptogenesis” [Phys. Lett. B 552 (2003) 177]
journal, May 2006

New constraints on heavy neutral leptons from Super-Kamiokande data
journal, March 2020

Physics beyond colliders at CERN: beyond the Standard Model working group report
journal, December 2019

General theory of weak processes involving neutrinos. II. Pure leptonic decays
journal, September 1981

Search for the Muon-Number-Nonconserving Decayμ→e+e+e−
journal, October 1984

Michel decay spectrum for a muon bound to a nucleus
journal, November 2014

Feebly-interacting particles: FIPs 2020 workshop report
journal, November 2021

Phenomenology of GeV-scale heavy neutral leptons
journal, November 2018

COMET Phase-I technical design report
journal, March 2020

Search for Lepton Flavor Violating Decays $τ^{\pm} \to ℓ^{\pm} π^{0}$ , $ℓ^{\pm} η$ , $ℓ^{\pm} η^{'}$
journal, February 2007

Neutrino decay and spontaneous violation of lepton number
journal, February 1982

Improved limit on the branching ratio of μ−→e+ conversion on titanium
journal, March 1998

The Phenomenology of Right Handed Neutrinos
journal, August 2013

Search for right-handed currents in muon decay
journal, October 1986

The effective Lagrangian for the seesaw model of neutrino mass and leptogenesis
journal, January 2003

Muon decay and physics beyond the standard model
journal, January 2001

On the IR/UV flavour connection in non-universal axion models
journal, June 2023

Can the family group be a global symmetry?
journal, September 1982

Astrophysical and terrestrial constraints on singlet Majoron models
journal, March 1994

Gauging lepton flavor SU(3) for the muon g − 2
journal, March 2022

Search for Invisible Axion Dark Matter with the Axion Dark Matter Experiment
journal, April 2018

Review of Particle Physics
journal, August 2022

Search for the decay μ+ → e+e+e−
journal, March 1988

Muon conversion to electron in nuclei in type-I seesaw models
journal, January 2013

Erratum: Detailed calculation of lepton flavor violating muon-electron conversion rate for various nuclei [Phys. Rev. D 66 , 096002 (2002)]
journal, September 2007

Dipole portal to heavy neutral leptons
journal, December 2018

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos
journal, March 2020

Muon decay spectrum: Leading logarithmic approximation
journal, June 2002

Search for the decay μ+ → e+e+e−
journal, October 1985

Right-handed neutrinos at CERN LHC and the mechanism of neutrino mass generation
journal, October 2007

The minimal flavour violating axion
journal, October 2017

Limits on Axion Couplings from the First 80 Days of Data of the PandaX-II Experiment
journal, November 2017

The Search for Feebly Interacting Particles
journal, September 2021

Higher order QED corrections to muon decay spectrum
journal, March 2003

Heavy-Neutrino Search Using $K_{μ 2}$ Decay
journal, November 1982

Flavor physics of leptons and dipole moments
journal, September 2008