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Search for lepton flavour violating decays of heavy resonances and quantum black holes to an e-mu pair in proton-proton collisions at sqrt(s) = 8 TeV
High Energy Physics - Experiment · Submitted 18 Apr 2016
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim With no evidence for physics beyond the standard model in the invariant mass spectrum of selected e-mu pairs, upper limits are set at 95% confidence level on the product of cross section and branching fraction for signals arising in theories with charged lepton flavour violation.
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The abstract, sentence by sentence
A search for narrow resonances decaying to an electron and a muon is presented. The e-mu mass spectrum is also investigated for non-resonant contributions from the production of quantum black holes (QBHs). The analysis is performed using data corresponding to an integrated luminosity of 19.7 inverse femtobarns collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. With no evidence for physics beyond the standard model in the invariant mass spectrum of selected e-mu pairs, upper limits are set at 95% confidence level on the product of cross section and branching fraction for signals arising in theories with charged lepton flavour violation. In the search for narrow resonances, the resonant production of a tau sneutrino in R-parity violating supersymmetry is considered. The tau sneutrino is excluded for masses below 1.28 TeV for couplings lambda[132] = lambda[231] = lambda'[311] = 0.01, and below 2.30 TeV for lambda[132] = lambda[231] = 0.07 and lambda'[311] = 0.11. These are the most stringent limits to date from direct searches at high-energy colliders. In addition, the resonance searches are interpreted in terms of a model with heavy partners of the Z boson and the photon. In a framework of TeV-scale quantum gravity based on a renormalization of Newton's constant, the search for non-resonant contributions to the e-mu mass spectrum excludes QBH production below a threshold mass M[th] of 1.99 TeV. In models that invoke extra dimensions, the bounds range from 2.36 TeV for one extra dimension to 3.63 TeV for six extra dimensions. This is the first search for QBHs decaying into the e-mu final state.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | A search for narrow resonances decaying to an electron and a muon is presented. | contribution 1.00 | 0.94 | 0.03 | asserted 0.92 |
| s1 | The e-mu mass spectrum is also investigated for non-resonant contributions from the production of quantum black holes (QBHs). | contribution 0.99 | 0.93 | 0.02 | asserted 0.97 |
| s2 | The analysis is performed using data corresponding to an integrated luminosity of 19.7 inverse femtobarns collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. | method 1.00 | 0.91 | 0.02 | asserted 0.99 |
| s3 | With no evidence for physics beyond the standard model in the invariant mass spectrum of selected e-mu pairs, upper limits are set at 95% confidence level on the product of cross section and branching fraction for signals arising in theories with charged lepton flavour violation. | result 1.00 | 0.96 | 0.75 | asserted 1.00 |
| s4 | In the search for narrow resonances, the resonant production of a tau sneutrino in R-parity violating supersymmetry is considered. | contribution 0.63 | 0.67 | 0.02 | asserted 0.95 |
| s5 | The tau sneutrino is excluded for masses below 1.28 TeV for couplings lambda[132] = lambda[231] = lambda'[311] = 0.01, and below 2.30 TeV for lambda[132] = lambda[231] = 0.07 and lambda'[311] = 0.11. | result 1.00 | 0.95 | 0.14 | asserted 1.00 |
| s6 | These are the most stringent limits to date from direct searches at high-energy colliders. | interpretation 0.77 | 0.57 | 0.13 | asserted 1.00 |
| s7 | In addition, the resonance searches are interpreted in terms of a model with heavy partners of the Z boson and the photon. | interpretation 0.86 | 0.86 | 0.03 | asserted 0.99 |
| s8 | In a framework of TeV-scale quantum gravity based on a renormalization of Newton's constant, the search for non-resonant contributions to the e-mu mass spectrum excludes QBH production below a threshold mass M[th] of 1.99 TeV. | result 0.95 | 0.94 | 0.12 | asserted 1.00 |
| s9 | In models that invoke extra dimensions, the bounds range from 2.36 TeV for one extra dimension to 3.63 TeV for six extra dimensions. | result 0.87 | 0.85 | 0.08 | asserted 1.00 |
| s10 | This is the first search for QBHs decaying into the e-mu final state. | contribution 0.60 | 0.80 | 0.05 | asserted 1.00 |
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The paper
Original abstract
A search for narrow resonances decaying to an electron and a muon is presented. The e-mu mass spectrum is also investigated for non-resonant contributions from the production of quantum black holes (QBHs). The analysis is performed using data corresponding to an integrated luminosity of 19.7 inverse femtobarns collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. With no evidence for physics beyond the standard model in the invariant mass spectrum of selected e-mu pairs, upper limits are set at 95% confidence level on the product of cross section and branching fraction for signals arising in theories with charged lepton flavour violation. In the search for narrow resonances, the resonant production of a tau sneutrino in R-parity violating supersymmetry is considered. The tau sneutrino is excluded for masses below 1.28 TeV for couplings lambda[132] = lambda[231] = lambda'[311] = 0.01, and below 2.30 TeV for lambda[132] = lambda[231] = 0.07 and lambda'[311] = 0.11. These are the most stringent limits to date from direct searches at high-energy colliders. In addition, the resonance searches are interpreted in terms of a model with heavy partners of the Z boson and the photon. In a framework of TeV-scale quantum gravity based on a renormalization of Newton's constant, the search for non-resonant contributions to the e-mu mass spectrum excludes QBH production below a threshold mass M[th] of 1.99 TeV. In models that invoke extra dimensions, the bounds range from 2.36 TeV for one extra dimension to 3.63 TeV for six extra dimensions. This is the first search for QBHs decaying into the e-mu final state.
Human review
How the literature uses it
8 arXiv papers cite this in 10 sentences
Papers citing it · 7 sentences without a confident label
Contests it 1 paper
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Let us finally remark that past collider searches in the context of trilinear $$ couplings [ref] are ineffectual for our scenario.
Searching for left sneutrino LSP at the LHC · Detection at the LHC · contest 0.77
Cites it as background 2 papers
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NCDF examples include the CMS LFV Quantum Black Hole to $eμ$ search [ref] .
Difference between two species of emu hides a test for lepton flavour violation · Generic different flavour constraints: $μ^±e^∓$ · 0.97
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Similar searches in LFV dilepton mass spectra have been carried out by the CDF [ref] and D0 [ref] experiments at the Fermilab Tevatron in proton-antiproton collisions at $√(s)=1.96$ and by the ATLAS and CMS experiments at the LHC in $$ collisions at $√(s)=8$ [ref] and 13 [ref] .
Search for heavy resonances and quantum black holes in e$\mu$, e$\tau$, and $\mu\tau$ final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV · Introduction · 0.87
What it cites · 14 sentences without a confident label
Uses the method or tool of 17 papers
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All signal samples use the CTEQ6L1 [ref] PDF, (v. 6.426) [ref] for hadronization with the underlying event tune Z2*, and are processed through a simulation of the full CMS detector based on (v. 9.4) [ref] .
PYTHIA 6.4 Physics and Manual · Signal simulation · 0.99
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All signal samples use the CTEQ6L1 [ref] PDF, (v. 6.426) [ref] for hadronization with the underlying event tune Z2*, and are processed through a simulation of the full CMS detector based on (v. 9.4) [ref] .
New Generation of Parton Distributions with Uncertainties from Global QCD Analysis · Signal simulation · 0.99
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The RPV and QBH signal samples are generated with the (v. 3.4.1) event generator [ref] .
CalcHEP 3.4 for collider physics within and beyond the Standard Model · Signal simulation · 1.00
Uses data or values from 5 papers
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The cross sections are calculated to next-to-next-to-leading order (NNLO) accuracy in perturbative QCD for [ref] and DY [ref] and to NLO accuracy for the [ref] , , , and [ref] processes.
Combining QCD and electroweak corrections to dilepton production in FEWZ · Background estimation · 0.89
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The cross sections are calculated to next-to-next-to-leading order (NNLO) accuracy in perturbative QCD for [ref] and DY [ref] and to NLO accuracy for the [ref] , , , and [ref] processes.
The total top quark pair production cross-section at hadron colliders through O(alpha_S^4) · Background estimation · 0.89
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The cross sections are calculated to next-to-next-to-leading order (NNLO) accuracy in perturbative QCD for [ref] and DY [ref] and to NLO accuracy for the [ref] , , , and [ref] processes.
MCFM for the Tevatron and the LHC · Background estimation · 0.89
Compares with 4 papers
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For RPV couplings $==0.07$ and $=0.11$, we set a mass limit of 2.30$$, and improve the lower bound of 2.0$$ previously set [ref] .
Search for a Heavy Neutral Particle Decaying to $e\mu$, $e\tau$, or $\mu\tau$ in $pp$ Collisions at $\sqrt{s}=8$ TeV with the ATLAS Detector · Results · 0.81
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Searches for resonant dijet production [ref] that cover the sneutrino decay to a pair via the coupling do not exclude this region of parameter space.
Search for new phenomena in the dijet mass distribution using $p-p$ collision data at $\sqrt{s}=8$ TeV with the ATLAS detector · Results · 0.84
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Searches for resonant dijet production [ref] that cover the sneutrino decay to a pair via the coupling do not exclude this region of parameter space.
Search for resonances and quantum black holes using dijet mass spectra in proton-proton collisions at sqrt(s) = 8 TeV · Results · 0.84
Cites as background 25 papers
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For $n=0$, it corresponds to a 3+1-dimensional model with low-scale quantum gravity, where a renormalization of Newton's constant leads to a Planck scale at the TeV scale [ref] ; $n=1$ corresponds to the Randall–Sundrum (RS) brane world model [ref] ; and $n>1$ to the Arkani-Hamed–Dimopoulos–Dvali (ADD) model [ref] .
The Lightest of Black Holes · Introduction · 0.85
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For $n=0$, it corresponds to a 3+1-dimensional model with low-scale quantum gravity, where a renormalization of Newton's constant leads to a Planck scale at the TeV scale [ref] ; $n=1$ corresponds to the Randall–Sundrum (RS) brane world model [ref] ; and $n>1$ to the Arkani-Hamed–Dimopoulos–Dvali (ADD) model [ref] .
Quantum gravity at a TeV and the renormalization of Newton's constant · Introduction · 0.85
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For $n=0$, it corresponds to a 3+1-dimensional model with low-scale quantum gravity, where a renormalization of Newton's constant leads to a Planck scale at the TeV scale [ref] ; $n=1$ corresponds to the Randall–Sundrum (RS) brane world model [ref] ; and $n>1$ to the Arkani-Hamed–Dimopoulos–Dvali (ADD) model [ref] .
An Alternative to Compactification · Introduction · 0.85
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