Dips at Colliders

Abstract

We categorize new physics signatures that manifest themselves as a "dip" structure at colliders. One potential way to realize a dip is to require interactions to be zero when all particles are mass on-shell, but not if one or more are mass off-shell. For three particle interactions, we have found three interesting cases: one massive gauge boson with two identical scalars; one massless gauge boson with two different scalars; one massive gauge boson with two identical massless gauge bosons. For each case, we identify the relevant effective operators to explore its dip signature at the LHC. Unfortunately, the unstable particle with a vanishing mass-on-shell interaction has a complex mass which is coincident with the complex pole in its propagator. As a result, a contact-like amplitude without a dip is produced. We then point out two other interesting ways that generate a dip in the cross section. The first way has a dip signature due to a zero in the vertex form factor of the time-like momentum in the s-channel. In the second way, the dip plus bump signature appears because there is destructive interference among processes of exchanging different s-channel particles.

changed the conclusion for the existence of dips for the vanishing mass-on-shell interactions, added a section about dip structures with a zero in the vertex form factor

References in corpus (8)

• 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
• Massive color-octet bosons and pairs of resonances at hadron colliders
• Heavy octets and Tevatron signals with three or four b jets
• Landau-Yang Theorem and Decays of a Z' Boson into Two Z Bosons
• Searches for light- and heavy-flavour three-jet resonances in pp collisions at sqrt(s) = 8 TeV
• The Need to Fairly Confront Spin-1 for the New Higgs-like Particle
• Physical Principles and Properties of Unstable States

Cited by in corpus (12)

• Higgs boson potential at colliders: status and perspectives
• Challenges and opportunities for heavy scalar searches in the $t\bar{t}$ channel at the LHC
• Dip or nothingness of a Higgs resonance from the interference with a complex phase
• Two Higgs Doublets and a Complex Singlet: Disentangling the Decay Topologies and Associated Phenomenology
• Nucleation is More than Critical -- A Case Study of the Electroweak Phase Transition in the NMSSM
• The NMSSM is within Reach of the LHC: Mass Correlations & Decay Signatures
• LHC signatures of a Z' mediator between dark matter and the SU(3) sector
• A note on the fate of the Landau-Yang theorem in non-Abelian gauge theories
• Benchmark Suggestions for Resonant Double Higgs Production at the LHC for Extended Higgs Sectors
• Signal-background interference for digluon resonances at the Large Hadron Collider
• Monochromatic Gamma Rays from Dark Matter Annihilation to Leptons
• Scalar production and decay to top quarks including interference effects at NLO in QCD in an EFT approach