High energy physics and cosmology at the unification frontier: Opportunities and challenges in the coming years

Nath, Pran

doi:10.1142/s0217751x1830017x

Cited by 4 publications

(2 citation statements)

References 298 publications

(234 reference statements)

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“…In addition, GUTs can also live alongside other BSM models, such as Supersymmetry (SUSY), with both theories complementing each other and on the whole becoming a better candidate for a successful BSM theory [22]. Naturally living at high energies, it is expected that GUTs have some observable consequences for the cosmological evolution of the Universe, as they can play a role during the inflationary epoch and their phase transitions may be the source for matter-antimatter asymmetry or gravitational waves [23]. With or without SUSY, GUTs also make predictions that can be tested at low energy experiments such as particle colliders, which can search for new exotic states or deviations on flavour observables.…”

Section: Introductionmentioning

confidence: 99%

GUT Physics in the Era of the LHC

et al. 2019

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Grand Unified Theories (GUTs) are one of the most interesting high-energy completions of the Standard Model, because they provide a rich, powerful and elegant group-theoretical framework able to resolve a variety of problems remaining in our current understanding of particle physics. They usually act as motivators for many low energy BSM theories, such as left-right symmetric or supersymmetric models, and they serve to fill the gap between the experimentally reachable low energies and the physics in the ultraviolet. In recent years, however, they have fallen slightly from the spotlight, in favour of "simplified" models with more specific phenomenological predictions. The aim of this review is to summarize the state of the art on GUTs and argue for their importance in modern physics. Recent advances in experiments permit to test the predictions of GUTs at different energy scales. First, as GUTs can play a role in the inflationary dynamics of the early Universe, their imprints could be found in the CMB observations by the Planck satellite. Remarkably enough, GUTs could manifest themselves also in terrestrial tests; several planned experiments aim to probe the proton stability and to establish order of magnitude higher bounds on its lifetime. Moreover, the predictions of specific GUT models could be tested even at the LHC thanks to its high energy reach, via searches for exotic states or additional contributions to flavour anomalies.

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Section: Introductionmentioning

confidence: 99%

GUT Physics in the Era of the LHC

et al. 2019

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“…It is also quite remarkable that supergravity models with sizable scalar masses in the range of several TeV are consistent with the unification of gauge couplings [18]. Thus the case for supersymmetry is stronger as a consequence of the discovery of the standard model-like Higgs boson [19,20].…”

Section: Introductionmentioning

confidence: 98%

Naturalness, the hyperbolic branch, and prospects for the observation of charged Higgs bosons at high luminosity LHC and 27 TeV LHC

Aboubrahim

Nath

2018

Phys. Rev. D

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One of the early criterion proposed for naturalness was a relatively small MSSM Higgs mixing parameter µ with µ/M Z of the order of a few. A relatively small µ may lead to heavier Higgs masses (H 0 , A, H ± in MSSM) which are significantly lighter than other scalars such as squarks. Such a situation is realized on the hyperbolic branch of radiative breaking of the electroweak symmetry. In this analysis we construct supergravity unified models with relatively small µ in the sense described above and discuss the search for the charged Higgs boson H ± at HL-LHC and HE-LHC where we also carry out a relative comparison of the discovery potential of the two using the decay channel H ± → τ ν. It is shown that an analysis based on the traditional linear cuts on signals and backgrounds is not very successful in extracting the signal while, in contrast, machine learning techniques such as boosted decision trees prove to be far more effective. Thus it is shown that models not discoverable with the conventional cut analyses become discoverable with machine learning techniques. Using boosted decision trees we consider several benchmarks and analyze the potential for their 5σ discovery at the 14 TeV HL-LHC and at 27 TeV HE-LHC. It is shown that while the ten benchmarks considered with the charged Higgs boson mass in the range 373 GeV-812 GeV are all discoverable at HE-LHC, only four of the ten with Higgs boson masses in the range 373 GeV-470 GeV are discoverable at HL-LHC. Further, while the model points discoverable at both HE-LHC and HL-LHC would require up to 7 years of running time at HL-LHC, they could all be discovered in a period of few months at HE-LHC. The analysis shows that a transition from HL-LHC to HE-LHC when technologically feasible would expedite the discovery of the charged Higgs for the benchmarks considered in this work. We note that the observation of a charged Higgs boson with mass in the range indicated would lend support to the idea of naturalness defined by a relatively small µ and further, it will lend support to radiative breaking of the electroweak symmetry occurring on the hyperbolic branch. *

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Supersymmetry unification, naturalness, and discovery prospects at HL-LHC and HE-LHC

Nath

2020

Eur. Phys. J. Spec. Top.

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High energy physics and cosmology at the unification frontier: Opportunities and challenges in the coming years

Cited by 4 publications

References 298 publications

GUT Physics in the Era of the LHC

GUT Physics in the Era of the LHC

Naturalness, the hyperbolic branch, and prospects for the observation of charged Higgs bosons at high luminosity LHC and 27 TeV LHC

Supersymmetry unification, naturalness, and discovery prospects at HL-LHC and HE-LHC

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