The motivation and status of two-body resonance decays after the LHC Run 2 and beyond

Kim, Jeong Han; Kong, Kyoungchul; Nachman, B. P.; Whiteson, D.

doi:10.1007/jhep04(2020)030

Cited by 20 publications

(21 citation statements)

References 33 publications

(47 reference statements)

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“…e + e + µ − µ − , that can naturally emerge easily, but that have thus far skirted systematic signature classification programs, see e.g. [3,44,45].…”

Section: Introductionmentioning

confidence: 99%

Exotic lepton-flavor violating Higgs decays

Evans

Tañedo

Zakeri

2020

J. High Energ. Phys.

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Exotic Higgs decays are promising channels to discover new physics in the near future. We present a simple model with a new light scalar that couples to the Standard Model through a charged lepton-flavor violating interaction. This can yield exciting new signatures, such as h → e + e + µ − µ − , that currently have no dedicated searches at the Large Hadron Collider. We discuss this model in detail, assess sensitivity from flavor constraints, explore current constraints from existing multi-lepton searches, and construct a new search strategy to optimally target these exotic, lepton-flavor violating Higgs decays.

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“…e + e + µ − µ − , that can naturally emerge easily, but that have thus far skirted systematic signature classification programs, see e.g. [3,44,45].…”

Section: Introductionmentioning

confidence: 99%

Exotic lepton-flavor violating Higgs decays

Evans

Tañedo

Zakeri

2020

J. High Energ. Phys.

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“…Note that both among experimentalists and theorists, there is actually growing interest in going beyond the intensively studied paradigm of a heavy resonance decaying into two SM particles, i.e., in considering a (lighter) BSM resonance among the decay products of the heavy resonance [37]. Our work here (and earlier papers on gauge KK signals) is in line with this effort; in particular, gauge KK decays into radion fit into group II/table 2 of [37], whereas the KK graviton decay into a pair of radions belongs to group Y/table 5, with KK graviton decay into KK gluon falling into group IV/table 4.…”

Section: Jhep11(2020)109mentioning

confidence: 99%

LHC signals for KK graviton from an extended warped extra dimension

Agashe

Ekhterachian

Kim

et al. 2020

J. High Energ. Phys.

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We analyze signals at the Large Hadron Collider (LHC) from production and decay of Kaluza-Klein (KK) gravitons in the context of “extended” warped extra-dimensional models, where the standard model (SM) Higgs and fermion fields are restricted to be in-between the usual ultraviolet/Planck brane and a ∼ O(10) TeV (new, “intermediate”) brane, whereas the SM gauge fields (and gravity) propagate further down to the ∼ O(TeV) infrared brane. Such a framework suppresses flavor violation stemming from KK particle effects, while keeping the KK gauge bosons and gravitons accessible to the LHC. We find that the signals from KK graviton are significantly different than in the standard warped model. This is because the usually dominant decay modes of KK gravitons into top quark, Higgs and longitudinal W/Z particles are suppressed by the above spatial separation between these two sets of particles, thus other decay channels are allowed to shine themselves. In particular, we focus on two novel decay channels of the KK graviton. The first one is the decay into a pair of radions, each of which decays (dominantly) into a pair of SM gluons, resulting in a resonant 4-jet final state consisting of two pairs of dijet resonance. On the other hand, if the radion is heavier and/or KK gluon is lighter, then the KK graviton mostly decays into a KK gluon and a SM gluon. The resulting KK gluon has a significant decay branching fraction into radion and SM gluon, thereby generating (again) a 4-jet signature, but with a different underlying event topology, i.e., featuring now three different resonances. We demonstrate that the High-Luminosity LHC (HL-LHC) has sensitivity to KK graviton of (up to) ∼ 4 TeV in both channels, in the specific model with only gluon field (and gravity) propagating in the extended bulk, whereas it is unlikely to have sensitivity in the standard dijet resonance search channel from KK graviton decay into two gluons.

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“…One way of alleviating this fear is to develop new searches that are as independent of theory prejudices as possible. For example, by focusing on simplified topologies wholly independent of theory motivation, it is possible to identify bumps in various invariant mass distributions that are not subject to any published LHC constraints but are amenable to straightforward analyses [34,35]. Another option is to replace theorists with machines, e.g.…”

Section: Who Ordered That?mentioning

confidence: 99%