scholarly journals Gauge hierarchy problem, supersymmetry, and fermionic symmetry

2015 ◽  
Vol 30 (25) ◽  
pp. 1550153 ◽  
Author(s):  
Yoshiharu Kawamura
Keyword(s):  
Standard Model ◽  
High Energy Physics ◽  
Planck Scale ◽  
High Energy ◽  
Effective Theory ◽  
Prototype Model ◽  
Hierarchy Problem ◽  
Gauge Hierarchy ◽  
The Standard Model ◽  
Energy Physics

We reconsider the gauge hierarchy problem from the viewpoint of effective field theories and a high-energy physics, motivated by the alternative scenario that the standard model holds up to a high-energy scale such as the Planck scale. The problem is restated as the question whether it is possible to construct a low-energy effective theory and the interaction with heavy particles, without spoiling the structure of a high-energy physics supported by an excellent concept. Based on this reinterpretation, we give a conjecture that theories with hidden fermionic symmetries can be free from the gauge hierarchy problem and become candidates of the physics beyond and/or behind the standard model, and present toy models with particle-ghost symmetries as illustrative examples and a prototype model for the grand unification.

scholarly journals CALCULATING TWO- AND THREE-BODY DECAYS WITH FeynArts AND FormCalc

2003 ◽  
Vol 14 (09) ◽  
pp. 1273-1278 ◽  
Author(s):  
MICHAEL KLASEN
Keyword(s):  
Standard Model ◽  
Particle Production ◽  
High Energy Physics ◽  
High Energy ◽  
Energy Distributions ◽  
Particle Decay ◽  
The Standard Model ◽  
Decay Widths ◽  
Three Body ◽  
Energy Physics

The Feynman diagram generator FeynArts and the computer algebra program FormCalc allow for an automatic computation of 2→2 and 2→3 scattering processes in High Energy Physics. We have extended this package by four new kinematical routines and adapted one existing routine in order to accomodate also two- and three-body decays of massive particles. This makes it possible to compute automatically two- and three-body particle decay widths and decay energy distributions as well as resonant particle production within the Standard Model and the Minimal Supersymmetric Standard Model at the tree- and loop-level. The use of the program is illustrated with three standard examples: [Formula: see text], [Formula: see text], and [Formula: see text].

scholarly journals Natural philosophy versus philosophy of naturalness

2020 ◽  
Vol 35 (18) ◽  
pp. 2030006 ◽  
Author(s):  
Goran Senjanović
Keyword(s):  
Particle Physics ◽  
High Energy Physics ◽  
Natural Philosophy ◽  
High Energy ◽  
Beyond The Standard Model ◽  
Hierarchy Problem ◽  
Guiding Principle ◽  
The Standard Model ◽  
New Phenomena ◽  
Energy Physics

I reflect on some of the basic aspects of present day Beyond the Standard Model particle physics, focusing mostly on the issues of naturalness, in particular on the so-called hierarchy problem. To all of us, physics as natural science emerged with Galileo and Newton, and led to centuries of unparalleled success in explaining and often predicting new phenomena of nature. I argue here that the long-standing obsession with the hierarchy problem as a guiding principle for the future of our field has had the tragic consequence of deviating high energy physics from its origins as natural philosophy, and turning it into a philosophy of naturalness.

scholarly journals Naturalness and Emergence

The Monist ◽  
2019 ◽  
Vol 102 (4) ◽  
pp. 499-524
Author(s):  
David Wallace
Keyword(s):  
Standard Model ◽  
High Energy Physics ◽  
High Energy ◽  
Fine Tuning ◽  
Entire Structure ◽  
The Standard Model ◽  
Intertheoretic Reduction ◽  
Energy Physics

Abstract I develop an account of naturalness (that is, approximately: lack of extreme fine-tuning) in physics which demonstrates that naturalness assumptions are not restricted to narrow cases in high-energy physics but are a ubiquitous part of how interlevel relations are derived in physics. After exploring how and to what extent we might justify such assumptions on methodological grounds or through appeal to speculative future physics, I consider the apparent failure of naturalness in cosmology and in the Standard Model. I argue that any such naturalness failure threatens to undermine the entire structure of our understanding of intertheoretic reduction, and so risks a much larger crisis in physics than is sometimes suggested; I briefly review some currently-popular strategies that might avoid that crisis.

SEARCHES FOR THE STANDARD MODEL HIGGS BOSON AT THE CDF EXPERIMENT

2009 ◽  
Vol 24 (04) ◽  
pp. 617-656
Author(s):  
SONG-MING WANG
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
High Energy Physics ◽  
High Energy ◽  
Electroweak Symmetry ◽  
The Past ◽  
The Standard Model ◽  
Using Data ◽  
Near Future ◽  
Energy Physics

The understanding of the dynamics behind the breaking of the electroweak symmetry is one of the most important goals in the field of high energy physics. In the Standard Model (SM) Higgs mechanism plays a key role in the symmetry breaking, one manifestation of which is spin-0 Higgs boson. Thus the search for the Higgs boson is one of the flag-ship analyses at the Tevatron. Over the past few years the CDF experiment has made significant improvements in its sensitivity on the search for the SM Higgs boson. In this paper we summarize CDF's most recent results on the searches for the SM Higgs boson production at the Tevatron using data samples of integrated luminosities up to 3 fb-1. We also present the Tevatron's latest combined results on the SM Higgs boson search, and discuss the possibility that it could be found at the Tevatron in the near future.

scholarly journals Testing new physics models with global comparisons to collider measurements: the Contur toolkit

2021 ◽  
Vol 4 (2) ◽  
Author(s):  
Andy Buckley ◽  
Jonathan Butterworth ◽  
Louie Corpe ◽  
Martin Habedank ◽  
Danping Huang ◽  
...  
Keyword(s):  
Standard Model ◽  
High Energy Physics ◽  
High Energy ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Physics Community ◽  
The Standard Model ◽  
Model Independence ◽  
High Degree ◽  
Energy Physics

Measurements at particle collider experiments, even if primarily aimed at understanding Standard Model processes, can have a high degree of model independence, and implicitly contain information about potential contributions from physics beyond the Standard Model. The CONTUR package allows users to benefit from the hundreds of measurements preserved in the RIVET library to test new models against the bank of LHC measurements to date. This method has proven to be very effective in several recent publications from the CONTUR team, but ultimately, for this approach to be successful, the authors believe that the CONTUR tool needs to be accessible to the wider high energy physics community. As such, this manual accompanies the first user-facing version: CONTUR v2. It describes the design choices that have been made, as well as detailing pitfalls and common issues to avoid. The authors hope that with the help of this documentation, external groups will be able to run their own CONTUR studies, for example when proposing a new model, or pitching a new search.

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