The Higgs-like boson spin from the center-edge asymmetry in the diphoton channel

Abstract

We discuss the discrimination of the 125 GeV spin-parity 0^+ Higgs-like boson observed at the LHC, decaying into two photons, H\toγγ, against the hypothesis of a minimally coupled J^{P}=2^+ narrow diphoton resonance with the same mass and giving the same total number of signal events under the peak. We apply, as the basic observable of the analysis, the center-edge asymmetry A_{CE} of the cosine of the polar angle of the produced photons in the diphoton rest frame to distinguish between the tested spin hypotheses. We show that the center-edge asymmetry A_{CE} should provide strong discrimination between the possibilities of spin-0 and spin-2 with graviton-like couplings, depending on the fraction of q\bar{q} production of the spin-2 signal, reaching a {CL}_s<10^{-6} for f_{qq}=0. Indeed, the A_{CE} has the potential to do better than existing analyses for f_{qq}<0.4.

arXiv comment11 pages, 5 figures. v2: version to appear in EPJ C

References in corpus (36)

• 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
• A Large Mass Hierarchy from a Small Extra Dimension
• Evidence for the spin-0 nature of the Higgs boson using ATLAS data
• Measurement of the properties of a Higgs boson in the four-lepton final state
• Observation of the diphoton decay of the Higgs boson and measurement of its properties
• Spin determination of single-produced resonances at hadron colliders
• Constraints on the spin-parity and anomalous HVV couplings of the Higgs boson in proton collisions at 7 and 8 TeV
• Measurement of Higgs boson production in the diphoton decay channel in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
• On the spin and parity of a single-produced resonance at the LHC
• Identifying the Higgs Spin and Parity in Decays to Z Pairs
• Higgs look-alikes at the LHC
• Aspects of CP violation in the HZZ coupling at the LHC
• Higgs Quantum Numbers in Weak Boson Fusion
• A Fast Track towards the `Higgs' Spin and Parity
• Probing the spin-parity of the Higgs boson via jet kinematics in vector boson fusion
• Diphoton signals for Low Scale Gravity in Extra Dimensions
• Measuring spin and CP from semi-hadronic ZZ decays using jet substructure
• Determining the Higgs spin and parity in the diphoton decay channel
• Theoretical Basis of Higgs-Spin Analysis in $H\to \gamma \gamma$ and $Z\gamma$ Decays
• Diphoton Signals for Large Extra Dimensions at the Tevatron and CERN LHC
• Angular and energy correlations in Higgs decay
• Spin and model identification of Z' bosons at the LHC
• Spin identification of the Randall-Sundrum resonance in lepton-pair production at the LHC
• Single-variable asymmetries for measuring the `Higgs' boson spin and CP properties
• Is the New Resonance Spin 0 or 2? Taking a Step Forward in the Higgs Boson Discovery
• Inferring the nature of the boson at 125-126 GeV
• Ascertaining the spin for new resonances decaying into tau+ tau- at Hadron Colliders
• Note on 125 GeV Spin-2 particle
• The shape of spins
• Discriminating graviton exchange effects from other new physics scenarios in e^+e^- collisions
• Center-Edge Asymmetry at Hadron Colliders
• Higgs Spin Determination in the WW channel and beyond
• Spin-analysis of s-channel diphoton resonances at the LHC
• Search and identification of extra spatial dimensions at LHC
• Sneutrino identification in dilepton events at the LHC