Erratum: New physics and tau $g\ensuremath{-}2$ using LHC heavy ion collisions [Phys. Rev. D 102, 113008 (2020)]

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Erratum: New physics and tau $g - 2$ using LHC heavy ion collisions [Phys. Rev. D 102, 113008 (2020)]

Lydia Beresford and Jesse Liu

Phys. Rev. D 106, 039902 – Published 10 August 2022

Abstract

Received 19 July 2022

DOI:https://doi.org/10.1103/PhysRevD.106.039902

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Electric moment Magnetic moment Relativistic heavy-ion collisions

Tau leptons

Hadron colliders

Nuclear PhysicsParticles & Fields

Authors & Affiliations

Lydia Beresford and Jesse Liu

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Original Article

New physics and tau $g - 2$ using LHC heavy ion collisions

Lydia Beresford and Jesse Liu

Phys. Rev. D 102, 113008 (2020)

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Vol. 106, Iss. 3 — 1 August 2022

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Figure 1
Distributions of lepton $p_{T}$ in $SR 1 ℓ 1 T$ (left) and the 3-track system $p_{T}$ in $SR 1 ℓ 3 T$ (center) for benchmark signals with various $δ a_{τ}$ , $δ d_{τ}$ couplings. These are normalized to unit integral to illustrate shape changes with varying $δ a_{τ}, δ d_{τ}$ . The lepton-track azimuthal angle $| Δ ϕ (ℓ, trk) |$ in $SR 1 ℓ 1 T$ (right) is shown for backgrounds (filled) and signal $δ a_{τ} = δ d_{τ} = 0$ (line), illustrating powerful discrimination against dilepton processes.
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Figure 2
Summary of lepton anomalous magnetic moments $a_{ℓ} = (g_{ℓ} - 2) / 2$ . Existing single-experiment measurements of $a_{e}$ [1], $a_{μ}$ [2], and $a_{τ}$ [3] are in blue. Our benchmark projections (green) assume $2 {nb}^{- 1}$ and $20 {nb}^{- 1}$ for 5% and 10% systematic uncertainties. For visual clarity, we inflate $1 σ$ error bars on $a_{e}$ ( $a_{μ}$ ) measurements by $10^{9}$ ( $10^{6}$ ), and $10^{4}$ for the SM prediction $a_{τ}^{pred}$ (orange) [4]. Collider constraints have thick (thin) lines denoting 68% C.L., $1 σ$ (95% C.L., $\sim 2 σ$ ). The smeft predictions [5, 6] from Eq. (4) of the paper with $C_{τ B} = - 1$ displays BSM scales $270 < Λ < 370 GeV$ (thick orange).
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Figure 3
Generator level cross sections for $γ γ \to τ τ$ sourced by our implementation of the Pb photon flux in madgraph. This is interfaced with smeftsim for BSM coupling variations in $δ a_{τ}$ defined in Eq. (4) of the paper, fixing $δ d_{τ} = 0$ at $\sqrt{s_{NN}} = 5.02 TeV$ . Left: contribution from only 1 BSM coupling (light blue triangles), 2 BSM couplings (dark blue squares), and their combined interference with the SM (red circles). The markers indicate the sampled points from $δ a_{τ}$ . Right: closeup of the $δ a_{τ}$ values near zero with gray regions denoting the 95% C.L. exclusion by DELPHI, where the horizontal axis is linear scale for $δ a_{τ} \in [- 0.001, 0.001]$ and logarithmic elsewhere.
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Figure 4
The $χ^{2}$ distributions as a function of $δ a_{τ}$ assuming $δ d_{τ} = 0$ (upper), and $δ d_{τ}$ assuming $δ a_{τ} = 0$ (lower) are displayed for 10% systematics at $L = 2 {nb}^{- 1}$ . Left: results from the $SR 1 ℓ 1 T$ regions and the impact of binning in $p_{T}^{ℓ}$ . Right: results from the $SR 1 ℓ 2 / 3 T$ regions. The four signal region combined $χ^{2}$ is shown by the green line for reference. The gray horizontal lines correspond to 68% C.L. ( $χ^{2} = 1$ ) and 95% C.L. ( $χ^{2} = 3.84$ ). The unphysical spikes are due to limited MC statistics.
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Figure 5
The $χ^{2}$ distributions as a function of $δ a_{τ}$ assuming $δ d_{τ} = 0$ (upper), and $δ d_{τ}$ assuming $δ a_{τ} = 0$ (lower). These are displayed for 10% (left), 5% (center) systematics at $L = 2 {nb}^{- 1}$ , and 5% systematics result extrapolated to $L = 20 {nb}^{- 1}$ (right). The combined $χ^{2}$ for all three track SRs is shown by the red line, while the impact of dividing $SR 1 ℓ 1 T$ into two orthogonal $p_{T}^{ℓ}$ bins is shown by the green line. The gray horizontal lines correspond to 68% C.L. ( $χ^{2} = 1$ ) and 95% C.L. ( $χ^{2} = 3.84$ ). The unphysical spikes are due to limited MC statistics.
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Physical Review D

covering particles, fields, gravitation, and cosmology

Erratum: New physics and tau $g - 2$ using LHC heavy ion collisions [Phys. Rev. D 102, 113008 (2020)]

Lydia Beresford and Jesse Liu

Phys. Rev. D 106, 039902 – Published 10 August 2022

Abstract

Physics Subject Headings (PhySH)

Authors & Affiliations

Article Text

Original Article

New physics and tau $g - 2$ using LHC heavy ion collisions

Lydia Beresford and Jesse Liu

Phys. Rev. D 102, 113008 (2020)

References

Issue

Physical Review D

covering particles, fields, gravitation, and cosmology

Erratum: New physics and tau g−2 using LHC heavy ion collisions [Phys. Rev. D 102, 113008 (2020)]

Lydia Beresford and Jesse Liu

Phys. Rev. D 106, 039902 – Published 10 August 2022

Abstract

Physics Subject Headings (PhySH)

Authors & Affiliations

Article Text

Original Article

New physics and tau g−2 using LHC heavy ion collisions

Lydia Beresford and Jesse Liu

Phys. Rev. D 102, 113008 (2020)

References

Issue

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Erratum: New physics and tau $g - 2$ using LHC heavy ion collisions [Phys. Rev. D 102, 113008 (2020)]

New physics and tau $g - 2$ using LHC heavy ion collisions