16 research outputs found
Neutrino mass from M Theory SO(10)
We study the origin of neutrino mass from arising from Theory
compactified on a -manifold. This is linked to the problem of the breaking
of the extra gauge group, in the subgroup of
, which we show can achieved via a (generalised) Kolda-Martin
mechanism. The resulting neutrino masses arise from a combination of the seesaw
mechanism and induced R-parity breaking contributions. The rather complicated
neutrino mass matrix is analysed for one neutrino family and it is shown how
phenomenologically acceptable neutrino masses can emerge.Comment: 32 pages, 12 figure
SO(10) Grand Unification in M theory on a G2 manifold
We consider Grand Unified Theories based on which originate from
string/ theory on manifolds or Calabi-Yau spaces with discrete
symmetries. In this framework we are naturally led to a novel solution of the
doublet-triplet splitting problem previously considered by Dvali which involves
an extra vector-like Standard Model family and light, but weakly coupled colour
triplets. These additional states are predicted to be accessible at the LHC and
also induce R-parity violation. Gauge coupling unification occurs with a larger
GUT coupling.Comment: 5 pages, added references, revised argument on equation 18, results
unchanged, a new example is given in equation 24, agrees with published
version in Physical Review
R-Parity violation in F-Theory
We discuss R-parity violation (RPV) in semi-local and local F-theory
constructions. We first present a detailed analysis of all possible
combinations of RPV operators arising from semi-local F-theory spectral cover
constructions, assuming an GUT. We provide a classification of all
possible allowed combinations of RPV operators originating from operators of
the form , including the effect of fluxes
with global restrictions. We then relax the global constraints and perform
explicit computations of the bottom/tau and RPV Yukawa couplings, at an
local point of enhancement in the presence of general fluxes subject
only to local flux restrictions. We compare our results to the experimental
limits on each allowed RPV operator, and show that operators such as ,
and may be present separately within current bounds,
possibly on the edge of observability, suggesting lepton number violation or
neutron-antineutron oscillations could constrain F-theory models.Comment: 40 pages, 13 figures, minor correction
MSSM from F-theory SU(5) with Klein Monodromy
We revisit a class of SUSY GUT models which arise in the context of
the spectral cover with Klein Group monodromy . We show that
matter parities can be realised via new geometric symmetries respected by
the spectral cover. We discuss a particular example of this kind, where the low
energy effective theory below the GUT scale is just the MSSM with no exotics
and standard matter parity, extended by the seesaw mechanism with two
right-handed neutrinos
Exploring parameter spaces with artificial intelligence and machine learning black-box optimisation algorithms
Constraining Beyond the Standard Model theories usually involves scanning
highly multi-dimensional parameter spaces and check observable predictions
against experimental bounds and theoretical constraints. Such task is often
timely and computationally expensive, especially when the model is severely
constrained and thus leading to very low random sampling efficiency. In this
work we tackled this challenge using Artificial Intelligence and Machine
Learning search algorithms used for Black-Box optimisation problems. Using the
cMSSM and the pMSSM parameter spaces, we consider both the Higgs mass and the
Dark Matter Relic Density constraints to study their sampling efficiency and
parameter space coverage. We find our methodology to produce orders of
magnitude improvement of sampling efficiency whilst reasonably covering the
parameter space.We thank José Santiago Pérez and Jorge Romão for the careful reading of the paper draft and for the useful discussions. This work is supported by FCT - Fundação para a Ciência e a Tecnologia, I.P. under project CERN/FIS-PAR/0024/2019. FAS is also supported by FCT under the research grant with reference UI/BD/153105/2022. The computational work was partially done using the resources made available by RNCA and INCD under project CPCA/A1/401197/2021info:eu-repo/semantics/publishedVersio
Starobinsky-like inflation in no-scale supergravity Wess-Zumino model with Polonyi term
We propose a simple modification of the no-scale supergravity Wess-Zumino
model of Starobinsky-like inflation to include a Polonyi term in the
superpotential. The purpose of this term is to provide an explicit mechanism
for supersymmetry breaking at the end of inflation. We show how successful
inflation can be achieved for a gravitino mass satisfying the strict upper
bound TeV, with favoured values
TeV. The model suggests that SUSY may be discovered in collider physics
experiments such as the LHC or the FCC.Comment: 13 pages, 4 figure
Jet substructure observables for jet quenching in quark gluon plasma: A machine learning driven analysis
We present a survey of a comprehensive set of jet substructure observables commonly used to study the modifications of jets resulting from interactions with the Quark Gluon Plasma in Heavy Ion Collisions. The JEWEL event generator is used to produce simulated samples of quenched and unquenched jets. Three distinct analyses using Machine Learning techniques on the jet substructure observables have been performed to identify both linear and non-linear relations between the observables, and to distinguish the Quenched and Unquenched jet samples. We find that most of the observables are highly correlated, and that their information content can be captured by a small set of observables. We also find that the correlations between observables are resilient to quenching effects and that specific pairs of observables exhaust the full sensitivity to quenching effects. The code, the datasets, and instructions on how to reproduce this work are also provided
Fitting a collider in a quantum computer: tackling the challenges of quantum machine learning for big datasets
The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/frai.2023.1268852/full#supplementary-materialCódigo computacional disponível em: https://github.com/mcpeixoto/QML-HEPCurrent quantum systems have significant limitations affecting the processing of large datasets with high dimensionality, typical of high energy physics. In the present paper, feature and data prototype selection techniques were studied to tackle this challenge. A grid search was performed and quantum machine learning models were trained and benchmarked against classical shallow machine learning methods, trained both in the reduced and the complete datasets. The performance of the quantum algorithms was found to be comparable to the
classical ones, even when using large datasets. Sequential Backward Selection and Principal Component Analysis techniques were used for feature's selection and while the former can produce the better quantum machine learning models in specific cases, it is more unstable. Additionally, we show that such variability in the results is caused by the use of discrete variables, highlighting the suitability of Principal Component analysis transformed data for quantum machine learning applications in the high energy physics context.The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This work was supported by Fundação para a Ciência e a Tecnologia, Portugal, through project CERN/FIS-COM/0004/2021 (“Exploring quantum machine learning as a tool for present and future high energy physics colliders”). IO was supported by the fellowship LCF/BQ/PI20/11760025 from La Caixa Foundation (ID 100010434) and by the European Union Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No 847648.info:eu-repo/semantics/publishedVersio