Disorder and mimesis at hadron colliders

D’Agnolo, Raffaele Tito; Low, Matthew

doi:10.1007/jhep08(2019)163

Cited by 9 publications

(7 citation statements)

References 46 publications

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“…Models of black hole production at colliders predict similar spectra [78,79], as do "string balls," lower-mass precursors of black holes [80,81]. Another model with interesting phenomenology, albeit without a well-motivated UV completion, achieves a wide range of couplings within a large ensemble of particles through a random mass matrix [82] (see also [83][84][85]). It would be interesting, in the future, to apply the event isotropy variable to more of these models.…”

Section: Comparison To Other High-multiplicity Models In the Literaturementioning

confidence: 99%

Spheres to jets tuning event shapes with 5d simplified models

Cesarotti

Reece

Strassler

2021

J. High Energ. Phys.

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Hidden sectors could give rise to a wide variety of events at the LHC. Confining hidden sectors are known to engender events with a small number of jets when they are weakly-coupled at high energies, and quasi-spherical soft unclustered energy patterns (SUEPs) when they are very strongly-coupled (large ‘t Hooft coupling) at high energies. The intermediate regime is murky, and could give rise to signals hiding from existing search strategies. While the intermediate coupling regime is not calculable, it is possible to pursue a phenomenological approach in which one creates signals that are intermediate between spherical and jetty. We propose a strategy for generating events of this type using simplified models in extra dimensions. The degree to which the event looks spherical is related to the number of decays produced near kinematic threshold. We provide an analytic understanding of how this is determined by parameters of the model. To quantify the shape of events produced with this model, we use a recently proposed observable — event isotropy — which is a better probe of the spherical regime than earlier event shape observables.

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Section: Comparison To Other High-multiplicity Models In the Literaturementioning

confidence: 99%

Spheres to jets tuning event shapes with 5d simplified models

Cesarotti

Reece

Strassler

2021

J. High Energ. Phys.

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“…Like DVs themselves, such sequences of DVs -i.e., such "tumblers" -can arise naturally in many extensions of the SM. These include models involving compressed supersymmetry [5], theories involving large numbers of additional degrees of freedom with a significant degree of disorder in their mass matrix [6], and scenarios involving non-minimal dark sectors [7].…”

Section: Tumblers At the Lhcmentioning

confidence: 99%

Tumblers: A Novel Collider Signature for Long-Lived Particles

Kim¹,

Leininger²,

Thomas³

2021

Preprint

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In this paper, we point out a novel signature of physics beyond the Standard Model which could potentially be observed both at the Large Hadron Collider (LHC) and at future colliders. This signature, which emerges naturally within many proposed extensions of the Standard Model, results from the multiple displaced vertices associated with the successive decays of unstable, long-lived particles along the same decay chain. We call such a sequence of displaced vertices a "tumbler." We examine the prospects for observing tumblers at the LHC and assess the extent to which tumbler signatures can be distinguished from other signatures of new physics which also involve multiple displaced vertices within the same collider event. As part of this analysis, we also develop a procedure for reconstructing the masses and lifetimes of the particles involved in the corresponding decay chains. We find that the prospects for discovering and distinguishing tumblers can be greatly enhanced by exploiting precision timing information such as would be provided by the CMS timing layer at the high-luminosity LHC. Our analysis therefore provides strong additional motivation for continued efforts to improve the timing capabilities of collider detectors at the LHC and beyond.

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“…However, as discussed in Refs. [35,36,37,38,39,40,41,42], it is also possible to obtain a negative effective mass through a negative Higgs portal coupling −λ SH . Qualitatively, such a contribution is given by ∆Π h ∼ −N λ SH T 2 , where T is the temperature of the S field.…”

Section: O(n ) Scalar Extension Of the CC B-l Modelmentioning

confidence: 99%

“…See Refs. [36,37,38,39,40,41,42] for recent studies. It is usually assumed that O(N ) scalars S are in the thermal equilibrium at the same temperature as the SM particles, T = T .…”

Section: O(n ) Scalar Extension Of the CC B-l Modelmentioning

confidence: 99%

“…For this purpose, we introduce O(N ) scalar fields S coupled to the Higgs field with a very weak negative coupling, and consider a novel history of the early universe: we suppose that the O(N ) sector has evolved almost separately from our universe, with a much higher temperature T than that of our universe. Then the negative coupling will generate sizable negative thermal corrections to the Higgs quadratic potential [35,36,37,38,39,40,41,42], and h | T QCD can become as large as 100 GeV. In the paper, we will consider two extremal cases, very massive S with m S m Z or massless S. We show that various observational constraints, especially sufficient dilution of axions and S particles, can be simultaneously satisfied in the massless case for N 10 19 , but not in the massive case.…”

Section: Introductionmentioning

confidence: 96%

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Axion-CMB Scenario in Supercooled Universe

Iso,

Kawana,

Shimada

2021

Preprint

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Axion-CMB scenario" is an interesting possibility to explain the temperature anisotropy of the cosmic microwave background (CMB) by primordial fluctuations of the QCD axion [1]. In this scenario, fluctuations of radiations are generated by an energy exchange between axions and radiations, which results in the correlation between the primordial axion fluctuations and the CMB anisotropies. Consequently, the cosmological observations stringently constrain a model of the axion and the early history of the universe. In particular, we need a large energy fraction Ω A of the axion at the QCD phase transition, but it must become tiny at the present universe to suppress the isocurvature power spectrum. One of natural cosmological scenarios to realize such a situation is the thermal inflation which can sufficiently dilute the axion abundance. Thermal inflation occurs in various models. In this paper, we focus on a classically conformal (CC) B-L model with a QCD axion. In this model, the early universe undergoes a long supercooling era of the B-L and electroweak symmetries, and thermal inflation naturally occurs. Thus it can be a good candidate for the axion-CMB scenario. But the axion abundance at the QCD transition is shown to be insufficient in the original CC B-L model. To overcome the situation, we extend the model by introducing N scalar fields S (either massive or massless) and consider a novel cosmological history such that the O(N ) and the B-L sectors evolve almost separately in the early universe. We find that all the necessary conditions for the axion-CMB scenario can be satisfied in some parameter regions for massless S fields, typically N ∼ 10 19 and the mass of B-L gauge boson around 5 − 10 TeV.

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Disorder and mimesis at hadron colliders

Cited by 9 publications

References 46 publications

Spheres to jets tuning event shapes with 5d simplified models

Spheres to jets tuning event shapes with 5d simplified models

Tumblers: A Novel Collider Signature for Long-Lived Particles

Axion-CMB Scenario in Supercooled Universe

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