Safe Jet Vetoes

Abstract

Central jet vetoes are powerful tools for reducing QCD background in measurements and searches for electroweak and colorless, new physics processes in hadron collisions. In this letter, we report the key findings of a new philosophy to designing searches for such phenomena at hadron colliders, one designed and centered around a dynamical jet veto instead a static veto applied independently of other selection criteria. Specifically, we investigate the theoretical and phenomenological consequences of setting the jet veto scale to the transverse momentum $(p_T)$ of the leading charged lepton $\ell$ in multi-lepton processes on an event-by-event basis. We consider the case of a TeV-scale heavy neutrino $N$ decaying to the trilepton final state and find the following: (i) Perturbative uncertainties associated with the veto greatly reduce due to tying the veto scale to the hard process scale. (ii) The signal efficiency for passing the veto jumps to $\gtrsim 95\%$ and exhibits little-to-no dependence on the neutrino mass scale. (iii) Top quark and `fake' lepton rejection capabilities also improve compared to only vetoing heavy flavor-tagged jets above a fixed $p_T$. This results in an increased sensitivity to active-sterile neutrino mixing by approximately an order of magnitude over the LHC's lifetime. For a Dirac neutrino with mass $m_N=150-1000$ GeV and the representative active-sterile mixing hypothesis $|V_{e4}|=|V_{\tau 4}|$ with $|V_{\mu 4}|=0$, we find that LHC experiments can probe $|V_{e4}{|}^2,|V_{\tau 4}{|}^2\lesssim 6\times 10^{-4}-8\times 10^{-3}$, surpassing the global upper limit for $m_N<450$ GeV, with $\mathcal{L}=3$ ab${}^{-1}$ of data at $\sqrt{s}=14$ TeV. Due to the color structures of the heavy $N$ production mechanisms considered, we argue that our results hold broadly for other color-singlet processes.

9 pages total, 4 figures. Matches journal version

References in corpus (29)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• LHAPDF6: parton density access in the LHC precision era
• FeynRules - Feynman rules made easy
• Tuning PYTHIA 8.1: the Monash 2013 Tune
• The CMS trigger system
• MadAnalysis 5, a user-friendly framework for collider phenomenology
• Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV
• Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV
• A standard format for Les Houches Event Files
• How bright is the proton? A precise determination of the photon parton distribution function
• Non-unitarity of the leptonic mixing matrix: Present bounds and future sensitivities
• The Photon Content of the Proton
• Illuminating the photon content of the proton within a global PDF analysis
• Threshold Resummation in Momentum Space from Effective Field Theory
• Heavy neutrino signals at large hadron colliders
• Search for heavy neutral leptons in events with three charged leptons in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Non-perturbative QCD effects in jets at hadron colliders
• NLO QCD corrections to tri-boson production
• Electroweak corrections to W + jet hadroproduction including leptonic W-boson decays
• QCD corrections to charged triple vector boson production with leptonic decay
• Glauber Gluons and Multiple Parton Interactions
• Measurement of the cross section for top quark pair production in association with a W or Z boson in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• An Explanation of the WW Excess at the LHC by Jet-Veto Resummation
• Four Tops for LHC
• Transverse momentum resummation effects in W^+W^- measurements
• The photon PDF of the proton
• Automated NNLL+NLO Resummation for Jet-Veto Cross Sections
• Heavy neutrinos from gluon fusion

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• Majorana Neutrinos in Same-Sign $W^{\pm }{W}^{\pm }$ Scattering at the LHC: Breaking the TeV Barrier
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• Collider Searches for Heavy Neutral Leptons: beyond simplified scenarios
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• BSM WW production with a jet veto
• Model-independent search strategy for the lepton-flavor-violating heavy Higgs boson decay to $\tau \mu$ at the LHC
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• Sleptons without Hadrons
• Searching for heavy neutrino in terms of tau lepton at future hadron collider
• Search for heavy Majorana neutrinos in the $\tau$ final state at proton-electron colliders
• Leptogenesis in an extended seesaw model with $U(1{)}_{B-L}$ symmetry
• Improving heavy Dirac neutrino prospects at future hadron colliders using machine learning
• Probe the Mixing Parameter $|V_{\tau N}{|}^2$ for Heavy Neutrinos
• Improving smuon searches with Neural Networks