H →τ
                            +
                            τ
                            −
                            γ as a probe of the τ magnetic dipole moment

Galon, Iftah; Rajaraman, Arvind; Tait, Tim M. P.

doi:10.1007/jhep12(2016)111

Cited by 15 publications

(12 citation statements)

References 56 publications

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“…The kinematical features of this decay will be rather different from those presented in the last sections due to the dominance of the QED radiation. Because of the complexity of the tau decay final states, the signal observation and the background suppression will need to be carefully analyzed [60]. We will leave this to a future analysis.…”

Section: H → τ + τ − γmentioning

confidence: 99%

Radiative decays of the Higgs boson to a pair of fermions

Han

Wang

2017

J. High Energ. Phys.

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Abstract:We revisit the radiative decays of the Higgs boson to a fermion pair h → ff γ where f denotes a fermion in the Standard Model (SM). We include the chiralityflipping diagrams via the Yukawa couplings at the order O(y 2 f α), the chirality-conserving contributions via the top-quark loops of the order O(y 2 t α 3 ), and the electroweak loops at the order O(α 4 ). The QED correction is about Q 2 f × O(1%) and contributes to the running of fermion masses at a similar level, which should be taken into account for future precision Higgs physics. The chirality-conserving electroweak-loop processes are interesting from the observational point of view. First, the branching fraction of the radiative decay h → µ + µ − γ is about a half of that of h → µ + µ − , and that of h → e + e − γ is more than four orders of magnitude larger than that of h → e + e − , both of which reach about 10 −4 . The branching fraction of h → τ + τ − γ is of the order 10 −3 . All the leptonic radiative decays are potentially observable at the LHC Run 2 or the HL-LHC. The kinematic distributions for the photon energy or the fermion pair invariant mass provide non-ambiguous discrimination for the underlying mechanisms of the Higgs radiative decay. We also study the process h → ccγ and evaluate the observability at the LHC. We find it potentially comparable to the other related studies and better than the h → J/ψ γ channel in constraining the charm-Yukawa coupling.

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Section: H → τ + τ − γmentioning

confidence: 99%

Radiative decays of the Higgs boson to a pair of fermions

Han

Wang

2017

J. High Energ. Phys.

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“…Investigations of tau identification have not been examined yet for LHeC and FCC-he detectors. In this case, identification efficiency can be detected as a function of transverse momentum and rapidity of the tau lepton [91].…”

Section: The Total Cross Sectionsmentioning

confidence: 99%

Search for the electromagnetic moments of the τ lepton in photon–photon collisions at the LHeC and the FCC-he

Köksal

2019

J. Phys. G: Nucl. Part. Phys.

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We examine the potential of the process ep → eγ * γ * p → eττ p at the Large Hadron Electron Collider (LHeC) and the Future Circular Hadron Electron Collider (FCC-he) to examine nonstandard ττ γ coupling in a model independent way by means of the effective Lagrangian approach.We perform pure leptonic and semileptonic decays for τ − τ + production in the final state. Furthermore, we use L = 10, 50, 100, 300, 500, 1000 fb −1 with at √ s = 1.30, 1.98, 7.07, 10 TeV and we consider systematic uncertainties of δ sys = 0, 5, 10%. The best sensitivity bounds obtained from the process ep → eγ * γ * p → eττ p on the anomalous couplings are −0.0025 <ã τ < 0.0009 and |d τ | < 8.85 × 10 −18 e cm, respectively. Therefore, our results show that the process ep → eγ * γ * p → eττ p at the LHeC and FCC-he are a very good prospect for probing the anomalous magnetic and electric dipole moments of the τ lepton at γ * γ * mode of the future ep collider.

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“…This process was previously studied in Ref. [26], and found to be promising for the end stage LHC running in a high luminosity mode. In this work, we extend this study to future lepton colliders and examine the contribution such machines could contribute to our understanding of the tau magnetic moment.…”

Section: Introductionmentioning

confidence: 97%

The $\tau$ Magnetic Dipole Moment at Future Lepton Colliders

Howard

Rajaraman

Riley

et al. 2019

LHEP

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The magnetic moment of the τ lepton is an interesting quantity that is potentially sensitive to physics beyond the Standard Model. Electroweak gauge invariance implies that a heavy new physics contribution to it takes the form of an operator which involves the Higgs boson, implying that rare Higgs decays are able to probe the same physics as a τ . We examine the prospects for rare Higgs decays at future high energy lepton (electron or muon) colliders, and find that such a project collecting a few ab −1 would be able to advance our understanding of this physics by roughly a factor of 10 compared to the expected reach of the high luminosity LHC. *

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H →τ + τ − γ as a probe of the τ magnetic dipole moment

Cited by 15 publications

References 56 publications

Radiative decays of the Higgs boson to a pair of fermions

Radiative decays of the Higgs boson to a pair of fermions

Search for the electromagnetic moments of the τ lepton in photon–photon collisions at the LHeC and the FCC-he

The $\tau$ Magnetic Dipole Moment at Future Lepton Colliders

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