21 research outputs found
Resolving Histogram Binning Dilemmas with Binless and Binfull Algorithms
The histogram is an analysis tool in widespread use within many sciences,
with high energy physics as a prime example. However, there exists an inherent
bias in the choice of binning for the histogram, with different choices
potentially leading to different interpretations. This paper aims to eliminate
this bias using two "debinning" algorithms. Both algorithms generate an
observed cumulative distribution function from the data, and use it to
construct a representation of the underlying probability distribution function.
The strengths and weaknesses of these two algorithms are compared and
contrasted. The applicability and future prospects of these algorithms is also
discussed.Comment: 19 pages, 5 figures; additional material to be found at
https://debinning.hepforge.org
Making the Dark Matter Connection Between Particle Physics and Cosmology
Dark matter has been shown to be extremely abundant in our universe. It comprises about 23 percent of the energy density of the entire universe, which is more than five times greater than the regular matter we already know about. Dark matter cannot be explained within the Standard Model of particle physics. However, models which extend the Standard Model, such as supersymmetry, can explain dark matter. This dissertation investigates the signals of some supersymmetry models in the context of collider physics. If dark matter particles or other supersymmetry particles are produced at some collider experiment, such as the Large Hadron Collider, it is important to know how we can find and measure the signatures and properties of these particles. This dissertation provides some measurement techniques for that exact purpose. These measurement techniques are also very general, making them useful for examining other models of particle physics as well. Lastly, if the supersymmetry model can be understood well enough from collider data, the connection back to cosmology can be made. Namely, it is possible to determine (from LHC data and using a standard cosmological calculation) the abundance of dark matter in the universe. Comparing this collider value with the value already measured will be a crucial step in understanding dark matter. This dissertation provides simulated results of this dark matter abundance calculation for a number of supersymmetry model points
Lepton Flavor Violation at the Large Hadron Collider
We investigate a potential of discovering lepton flavor violation (LFV) at
the Large Hadron Collider. A sizeable LFV in low energy supersymmetry can be
induced by massive right-handed neutrinos, which can explain neutrino
oscillations via the seesaw mechanism. We investigate a scenario where the
distribution of an invariant mass of two hadronically decaying taus
(\tauh\tauh) from \schizero{2} decays is the same in events with or without
LFV. We first develop a transfer function using this ditau mass distribution to
model the shape of the non-LFV \tauh\mu invariant mass. We then show the
feasibility of extracting the LFV \tauh\mu signal. The proposed technique can
also be applied for a LFV \tauh e search.Comment: 8 pages, 6 figures, accepted for publiucation in PR
Determining the Dark Matter Relic Density in the Minimal Supergravity Stau-Neutralino Coannihilation Region at the Large Hadron Collider
We examine the stau-neutralino coannihilation (CA) mechanism of the early
universe. We use the minimal supergravity (mSUGRA) model and show that from
measurements at the Large Hadron Collider one can predict the dark matter relic
density with an uncertainty of 6% with 30 fb-1 of data, which is comparable to
the direct measurement by Wilkinson Microwave Anisotropy Probe. This is done by
measuring four mSUGRA parameters m0, m1/2, A0 and tan(beta) without requiring
direct measurements of the top squark and bottom squark masses. We also provide
precision measurements of the gaugino, squark, and lighter stau masses in this
CA region without assuming gaugino universality.Comment: LaTex file, 4 pages, 5 eps fugures. Final version. Appear in PR
Diagnosis of Supersymmetry Breaking Mediation Schemes by Mass Reconstruction at the LHC
If supersymmetry is discovered at the LHC, the next question will be the
determination of the underlying model. While this may be challenging or even
intractable, a more optimistic question is whether we can understand the main
contours of any particular paradigm of the mediation of supersymmetry breaking.
The determination of superpartner masses through endpoint measurements of
kinematic observables arising from cascade decays is a powerful diagnostic
tool. In particular, the determination of the gaugino sector has the potential
to discriminate between certain mediation schemes (not all schemes, and not
between different UV realizations of a given scheme). We reconstruct gaugino
masses, choosing a model where anomaly contributions to supersymmetry breaking
are important (KKLT compactification), and find the gaugino unification scale.
Moreover, reconstruction of other superpartner masses allows us to solve for
the parameters defining the UV model. The analysis is performed in the stop and
stau coannihilation regions where the lightest neutralinos are mainly gauginos,
to additionally satisfy dark matter constraints. We thus develop observables to
determine stau and stop masses to verify that the coannihilation mechanism is
indeed operational, and solve for the relic density.Comment: 16 pages, 14 figures. Figure 7 updated to show top peak. Minor
changes to other figure
Determination of nonuniversal supergravity models at the Large Hadron Collider
We examine a well motivated non-universal supergravity model where the Higgs
boson masses are not unified with the other scalars at the grand unified scale
at the LHC. The dark matter content can easily be satisfied in this model by
having a larger Higgsino component in the lightest neutralino. Typical final
states in such a scenario at the LHC involve W bosons. We develop a bi-event
subtraction technique to remove a huge combinatorial background to identify W
-> jj decays. This is also a key technique to reconstruct supersymmetric
particle masses in order to determine the model parameters. With the model
parameters, we find that the dark matter content of the universe can be
determined in agreement with existing experimental results.Comment: 19 pages, 8 figures, corrected figures for visibility, additional
background and systematic uncertainties estimated, references added and
correcte
Bi-Event Subtraction Technique at Hadron Colliders
We propose the Bi-Event Subtraction Technique (BEST) as a method of modeling
and subtracting large portions of the combinatoric background during
reconstruction of particle decay chains at hadron colliders. The combinatoric
background arises when it is impossible to know experimentally which observed
particles come from the decay chain of interest. The background shape can be
modeled by combining observed particles from different collision events and be
subtracted away, greatly reducing the overall background. This idea has been
demonstrated in various experiments in the past. We generalize it by showing
how to apply BEST multiple times in a row to fully reconstruct a cascade decay.
We show the power of BEST with two simulated examples of its application
towards reconstruction of the top quark and a supersymmetric decay chain at the
Large Hadron Collider.Comment: 4 pages, 4 figure
A global fit of the MSSM with GAMBIT
We study the seven-dimensional Minimal Supersymmetric Standard Model (MSSM7) with the new GAMBIT software framework, with all parameters defined at the weak scale. Our analysis significantly extends previous weak-scale, phenomenological MSSM fits, by adding more and newer experimental analyses, improving the accuracy and detail of theoretical predictions, including dominant uncertainties from the Standard Model, the Galactic dark matter halo and the quark content of the nucleon, and employing novel and highly-efficient statistical sampling methods to scan the parameter space. We find regions of the MSSM7 that exhibit co-annihilation of neutralinos with charginos, stops and sbottoms, as well as models that undergo resonant annihilation via both light and heavy Higgs funnels. We find high-likelihood models with light charginos, stops and sbottoms that have the potential to be within the future reach of the LHC. Large parts of our preferred parameter regions will also be accessible to the next generation of direct and indirect dark matter searches, making prospects for discovery in the near future rather good
Supersymmetry signals of supercritical string cosmology at the Large Hadron Collider
We investigate the minimal supergravity (mSUGRA) signals at the LHC in the
context of supercritical string cosmology (SSC). In this theory, the presence
of a time dependent dilaton provides us with a smoothly evolving dark energy
and modifies the dark matter allowed region of the mSUGRA model with standard
cosmology. Such a dilaton dilutes the supersymmetric dark matter density (of
neutralinos) by a factor O(10) and consequently the regions with too much dark
matter in the standard scenario are allowed in the SSC. The final states
expected at the LHC in this scenario, unlike the standard scenario, consist of
Z bosons, Higgs bosons, and/or high energy taus. We show how to characterize
these final states and determine the model parameters. Using these parameters,
we determine the dark matter content and the neutralino-proton cross section.
All these techniques can also be applied to determine model parameters in SSC
models with different SUSY breaking scenarios.Comment: 26 pages, 21 figures, minor changes and references adde