The compatibility of LHC Run 1 data with a heavy scalar of mass around 270\,GeV

Abstract

The first run of the LHC was successful in that it saw the discovery of the elusive Higgs boson, a particle that is consistent with the SM hypothesis. There are a number of excesses in Run 1 ATLAS and CMS results which can be interpreted as being due to the existence of another heavier scalar particle. This particle has decay modes which we have studied using LHC Run 1 data. Using a minimalistic model, we can predict the kinematics of these final states and compare the prediction against data directly. A statistical combination of these results shows that a best fit point is found for a heavy scalar having a mass of 272${}_{-9}^{+12}$\,GeV. This result has been quantified as a three sigma effect, based on analyses which are not necessarily optimized for the search of a heavy scalar. The smoking guns for the discovery of this new heavy scalar and the prospects for Run 2 are discussed.

When first manuscript was submitted a number of experimental Run I results were not avaiable. In this new version of the manuscript a complete set of Run I experimental results has been analyzed in a global fit. More attention has been paid to the gauge invariance of the Lagrangian, leading to a discussion on an intermediate real particle. The list of smoking gun final states has been expanded

References in corpus (22)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• 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
• Higgs boson gluon-fusion production in N3LO QCD
• OneLOop: for the evaluation of one-loop scalar functions
• Higgs boson production in association with a jet at next-to-next-to-leading order
• Search for an additional, heavy Higgs boson in the $H\to ZZ$ decay channel at $\sqrt{s}$ = 8 TeV in $pp$ collision data with the ATLAS detector
• Search for a Higgs boson in the mass range from 145 to 1000 GeV decaying to a pair of W or Z bosons
• Dynamics of Perturbations in Double Field Theory & Non-Relativistic String Theory
• Search for the Standard Model Higgs boson produced in association with top quarks and decaying into $b\bar{b}$ in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• Searches for Higgs boson pair production in the $hh\to bb\tau \tau ,\gamma \gamma WW\ast ,\gamma \gamma bb,bbbb$ channels with the ATLAS detector
• Search for the associated production of the Higgs boson with a top-quark pair
• Search for a high-mass Higgs boson decaying to a $W$ boson pair in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Measurements of fiducial and differential cross sections for Higgs boson production in the diphoton decay channel at $\sqrt{s}=8$ TeV with ATLAS
• Search for $H\to \gamma \gamma$ produced in association with top quarks and constraints on the Yukawa coupling between the top quark and the Higgs boson using data taken at 7 TeV and 8 TeV with the ATLAS detector
• Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector
• Fiducial and differential cross sections of Higgs boson production measured in the four-lepton decay channel in $pp$ collisions at $\sqrt{s}$=8 TeV with the ATLAS detector
• Searches for a heavy scalar boson H decaying to a pair of 125 GeV Higgs bosons hh or for a heavy pseudoscalar boson A decaying to Zh, in the final states with h to tau tau
• Searches for heavy Higgs bosons in two-Higgs-doublet models and for t to ch decay using multilepton and diphoton final states in pp collisions at 8 TeV
• Measurement of differential cross sections for Higgs boson production in the diphoton decay channel in pp collisions at sqrt(s) = 8 TeV
• Higgs boson production in association with a jet at NNLO using jettiness subtraction

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• Multi-lepton signatures of additional scalar bosons beyond the Standard Model at the LHC
• Impact of additional bosons on the exploration of the Higgs boson at the LHC
• The use of Generative Adversarial Networks to characterise new physics in multi-lepton final states at the LHC
• Machine learning approach for the search of resonances with topological features at the Large Hadron Collider
• The production of the heavy scalar H in association with top and anti-top quarks
• Data driven method for predicting the shape of the dijet mass in $Zh+{E_{\mathrm{T}}}^{\mathrm{miss}}$ analysis
• Production of the Madala boson in association with top quarks
• Exploring the Potential of the Dark Matter Candidate from the Madala Hypothesis with Multi-frequency Indirect Detection
• Phenomenology of additional scalar bosons at the LHC