Search for quantum black hole production in $\mathrm{lepton}+\text{jet}$ final states using proton-proton collisions at $\sqrt{s}=13\text{ }\text{ }\mathrm{TeV}$ with the ATLAS detector

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Search for quantum black hole production in $lepton + jet$ final states using proton-proton collisions at $\sqrt{s} = 13 TeV$ with the ATLAS detector

G. Aad et al. (ATLAS Collaboration)

Phys. Rev. D 109, 032010 – Published 27 February 2024

Abstract

A search for quantum black holes in $electron + jet$ and $muon + jet$ invariant mass spectra is performed with $140 {fb}^{- 1}$ of data collected by the ATLAS detector in proton-proton collisions at $\sqrt{s} = 13 TeV$ at the Large Hadron Collider. The observed invariant mass spectrum of $lepton + jet$ pairs is consistent with Standard Model expectations. Upper limits are set at 95% confidence level on the production cross section times branching fractions for quantum black holes decaying into a lepton and a quark in a search region with invariant mass above 2.0 TeV. The resulting quantum black hole lower mass threshold limit is 9.2 TeV in the Arkani-Hamed-Dimopoulos-Dvali model, and 6.8 TeV in the Randall-Sundrum model.

Received 28 July 2023
Accepted 1 December 2023

DOI:https://doi.org/10.1103/PhysRevD.109.032010

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. Funded by SCOAP³.

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Quantum aspects of black holes Quantum gravity Signatures with light leptons

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Vol. 109, Iss. 3 — 1 February 2024

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Figure 1
The distributions of events over the invariant mass of the leading lepton and the leading jet are shown after the background-only fit. The data (points with error bars) and SM backgrounds (solid histograms) are shown in (a), (c), and (e) for the $electron + jet$ channel and in (b), (d), and (f) for the $muon + jet$ channel. The normalizations extracted from the fit in the CRs are applied in the full $m_{inv}$ range. (a),(b) The WCR and WVR. (c),(d) The ZCR and ZVR. (e),(f) The TCR and TVR. The lower panels show the ratio of the number of events observed in the data to the fitted total background. The hatched bands represent the total relative uncertainty in the background estimate.
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Figure 2
The distributions of events over the invariant mass of the leading lepton and the leading jet in the SR for data (points with error bars) and for SM backgrounds (solid histograms) after the background-only fit are shown in (a) the $electron + jet$ and (b) the $muon + jet$ channels. The normalizations extracted from the fit in the CRs are applied in the full $m_{inv}$ range including the SR. The sum of the systematic uncertainties and the statistical errors due to the limited size of the fitted MC samples is shown by the hatched area. The lower panels show the ratios of the number of events observed in the data to the fitted total background. The hatched band represents the total relative uncertainty in the background estimate. Two examples of QBH signals normalized to the predicted cross section are overlaid.
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Figure 3
The 95% CL model-independent upper limits on $σ \times B r$ for the non-SM signal production with decay into $lepton + jet$ (combined channel). The limits take into account statistical and systematic uncertainties. Circles along the solid red line indicate the lower border of the SR (threshold of SR, ${Th}_{SR}$ ), above which the observed limit is computed. The expected limits are shown by the dashed line. The $\pm 1 σ$ and $\pm 2 σ$ bands of expected limits are shown in green and yellow, respectively. The limits are obtained with pseudoexperiments.
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Figure 4
The combined 95% CL upper limits on $σ \times B r$ as a function of $M_{th}$ for QBH production at $M_{th} = M_{D}$ with decay into $lepton + jet$ for (a) ADD (extra dimensions $n = 6$ ) and (b) RS1 (extra dimensions $n = 1$ ). The limits take into account statistical and systematic uncertainties. Circles along the solid red line indicate the mass $M_{th}$ of the signal where the observed limit is computed. The expected limits are shown by the dashed line. The $\pm 1 σ$ and $\pm 2 σ$ bands are shown in green and yellow, respectively. The theoretically predicted $σ \times B r$ for the QBH production and decay is shown as the solid blue curve with squares. The limits are obtained with pseudoexperiments.
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Physical Review D

covering particles, fields, gravitation, and cosmology

Search for quantum black hole production in $lepton + jet$ final states using proton-proton collisions at $\sqrt{s} = 13 TeV$ with the ATLAS detector

G. Aad et al. (ATLAS Collaboration)

Phys. Rev. D 109, 032010 – Published 27 February 2024

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Physical Review D

covering particles, fields, gravitation, and cosmology

Search for quantum black hole production in lepton+jet final states using proton-proton collisions at s=13 TeV with the ATLAS detector

G. Aad et al. (ATLAS Collaboration)

Phys. Rev. D 109, 032010 – Published 27 February 2024

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Search for quantum black hole production in $lepton + jet$ final states using proton-proton collisions at $\sqrt{s} = 13 TeV$ with the ATLAS detector