Cross sections and energy loss for lepton pair production in muon transport

Bulmahn, Alexander; Reno, Mary Hall

doi:10.1103/physrevd.79.053008

Cited by 6 publications

(15 citation statements)

References 38 publications

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“…II, we describe how our prior work for calculating the cross section for lepton pair production from muons scattering with atomic targets can be applied to numerical calculations of the energy distribution of the leptons produced for fixed muon energy [8]. The approximate analytic form of Tannenbaum [20] can be translated to an electron energy distribution which agrees well with our numerical results.…”

Section: Introductionsupporting

confidence: 63%

“…[8] the formulas to evaluate the differential cross section for a charged muon to scatter with a nucleus of charge Z and atomic number A. These formulas extend the work of Kel'ner [9] and Akhundov et al [12] and others [13] so that they are applicable to both electron-positron pair production and tau pair production.…”

Section: A Lepton Pair Productionmentioning

confidence: 83%

“…[8], for electron-positron pair production, the differential cross section is dominated by very low momentum transfers to the target. Consequently, coherent scattering with the nucleus dominates the cross section, and the static nucleus approximation of Kel'ner [9] is quite good.…”

Section: A Lepton Pair Productionmentioning

confidence: 99%

“…(3). The approximate form for the differential energy distribution of the produced electron does not have an easy correspondence to tau pair production [8]. For tau pairs, there is a significant contribution from inelastic scattering of the muon with the target and higher momentum transfers need to be taken into account.…”

Section: A Lepton Pair Productionmentioning

confidence: 99%

“…The downward atmospheric muon flux itself [4][5][6][7] presents an opportunity to explore the predictions of quantum electrodynamics. A well-known process is charged lepton pair production [8][9][10][11][12][13], e.g.,…”

Section: Introductionmentioning

confidence: 99%

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High energy leptons from muons in transit

Bulmahn

Reno

2010

Phys. Rev. D

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The differential energy distribution for electrons and taus produced from lepton pair production from muons in transit through materials is numerically evaluated. We use the differential cross section to calculate underground lepton fluxes from an incident atmospheric muon flux, considering contributions from both conventional and prompt fluxes. An approximate form for the charged current differential neutrino cross section is provided and used to calculate single lepton production from atmospheric neutrinos. We compare the fluxes of underground leptons produced from incident muons with those produced from incident neutrinos and photons from muon bremsstrahlung. We discuss their relevance for underground detectors.Comment: 11 pages, 9 figures v2: Revised to include the calculation of muon bremsstrahlung events in comparison to pair production events. 1 new figur

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Section: Introductionsupporting

confidence: 63%

Section: A Lepton Pair Productionmentioning

confidence: 83%

Section: A Lepton Pair Productionmentioning

confidence: 99%

Section: A Lepton Pair Productionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High energy leptons from muons in transit

Bulmahn

Reno

2010

Phys. Rev. D

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Lepton-flavor-violating ALPs at the Electron-Ion Collider: a golden opportunity

Davoudiasl

Marcarelli

Neil

2023

J. High Energ. Phys.

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Axion-like particles (ALPs) arise in a variety of theoretical contexts and can, in general, mediate flavor violating interactions and parity non-conservation. We consider lepton flavor violating ALPs with GeV scale or larger masses which may, for example, arise in composite dark sector models. We show that a future Electron-Ion Collider (EIC) can uncover or constrain such ALPs via processes of the type e AZ→ τ AZa, where AZ is a nucleus of charge Z and a is an ALP in the range mτ≤ ma ≲ 20 GeV. The production of the ALP can have a large Z2 enhancement from low Q2 electromagnetic scattering of the electron from a heavy ion. Using the gold nucleus (Z = 79) as an example, we show that the EIC can explore e − τ flavor violation, mediated by GeV-scale ALPs, well beyond current limits. Importantly, the EIC reach for this interaction is not sensitive to the lepton-flavor conserving ALP couplings, whose possible smallness can render searches using τ decays ineffective. We also discuss how the EIC electron beam polarization can provide a powerful tool for investigating parity violating ALPs.

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Lepton-flavor-violating ALP signals with TeV-scale muon beams

Batell,

Davoudiasl,

Marcarelli

et al. 2024

Phys. Rev. D

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We explore the feasibility of using TeV-energy muons to probe lepton-flavor-violating (LFV) processes mediated by an axionlike particle (ALP) a with mass O(10 GeV). We focus on μτ LFV interactions and assume that the ALP is coupled to a dark state χ, which can be either less or more massive than a. Such a setup is demonstrated to be consistent with χ being a candidate for dark matter, in the experimentally relevant regime of parameters. We consider the currently operating NA64-μ experiment and proposed FASERν2 detector as both the target and the detector for the process μA→τAa, where A is the target nucleus. We also show that a possible future active muon fixed-target experiment operating at a 3 TeV muon collider or in its preparatory phase can provide an impressive reach for the LFV process considered, with future FASERν2 data providing a pilot study towards that goal. The implications of the muon anomalous magnetic moment (g−2)μ measurements for the underlying model, in case of a positive signal, are also examined, and a sample UV completion is outlined. Published by the American Physical Society 2024

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Cross sections and energy loss for lepton pair production in muon transport

Cited by 6 publications

References 38 publications

High energy leptons from muons in transit

High energy leptons from muons in transit

Lepton-flavor-violating ALPs at the Electron-Ion Collider: a golden opportunity

Lepton-flavor-violating ALP signals with TeV-scale muon beams

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