Implications of diphoton searches for a Radion in the Bulk-Higgs Scenario

Abstract

In this work we point out that the apparent diphoton excess initially presented by the ATLAS and CMS collaborations could have originated from a radion in the bulk Higgs scenario within a warped extra dimension. In this scenario the couplings of the radion to massive gauge bosons are suppressed, allowing it to evade existing searches. In the presence of mixing with the Higgs, due to the strong constraints from diboson searches, only points near what we denominate the alignment region were able to explain the diphoton signal and evade other experimental constraints. In light of the new measurements presented at ICHEP 2016 by both LHC collaborations, which do not confirm the initial diphoton excess, we study the current and future collider constraints on a radion within the bulk-Higgs scenario. We find that searches in the diphoton channel provide the most powerful probe of this scenario and already exclude large regions of parameter space, particularly for smaller warp factors. The radion has a sizeable branching ratio into top pairs and this channel may also give competitive constraints in the future. Finally, diHiggs searches can provide a complementary probe in the case of non-zero radion-Higgs mixing but strong alignment.

arXiv comment20 pages, 12 figures. Several changes including consequences from ICHEP2016. Final version accepted by journal

References in corpus (22)

• A Large Mass Hierarchy from a Small Extra Dimension
• Modeling the fifth dimension with scalars and gravity
• Search for new phenomena in the dijet mass distribution using $p-p$ collision data 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 diphoton resonances in the mass range from 150 to 850 GeV in pp collisions at sqrt(s) = 8 TeV
• Radion Phenomenology in Realistic Warped Space Models
• Search for high-mass diphoton resonances in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• A Naturally Light Dilaton and a Small Cosmological Constant
• A naturally light dilaton
• The Little Randall-Sundrum Model at the Large Hadron Collider
• eHDECAY: an Implementation of the Higgs Effective Lagrangian into HDECAY
• Naturally light dilatons from nearly marginal deformations
• Radion/Dilaton-Higgs Mixing Phenomenology in Light of the LHC
• CP-even scalar boson production via gluon fusion at the LHC
• Diphoton Resonance from a Warped Extra Dimension
• Precocious Diphoton Signals of the Little Radion at Hadron Colliders
• A Soft-Wall Dilaton
• Gravity on a Little Warped Space
• From the 750 GeV Diphoton Resonance to Multilepton Excesses
• Diphoton channel at the LHC experiments to find a hint for a new heavy gauge boson
• 750 GeV Diphoton Resonance in a Vector-like Extension of Hill Model
• The 750 GeV diphoton excess and SUSY

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