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Unraveling the Mysteries: Measurements Performed With The CMS Detector Using LHC Run Proton Proton

Jese Leos
· 6.7k Followers · Follow
Published in Top Quark Pair Production Cross Sections And Calibration Of The Top Quark Monte Carlo Mass: Measurements Performed With The CMS Detector Using LHC Run I Proton Proton Collision Data (Springer Theses)
5 min read ·
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Since its inception, CERN's Large Hadron Collider (LHC) has been at the forefront of high-energy physics research. The LHC has enabled scientists to explore the fundamental building blocks of our universe and push the boundaries of human knowledge. Among the many detectors used in experiments at the LHC, the CMS detector stands out as a key player in unlocking the secrets of the universe.

The CMS (Compact Muon Solenoid) detector is a massive scientific instrument designed to measure various particles produced through high-energy collisions. It plays an integral role in observing and studying the elusive Higgs boson, discovering new particles, and studying the properties of the known particles.

During LHC Run 1 (2010-2013) and Run 2 (2015-2018), a multitude of crucial measurements were conducted using the CMS detector. These measurements have allowed scientists to advance our understanding of many fundamental aspects of particle physics.

Top-Quark Pair Production Cross Sections and Calibration of the Top-Quark Monte-Carlo Mass: Measurements Performed with the CMS Detector Using LHC Run I Proton-Proton Collision Data (Springer Theses)
by Baby Professor (1st ed. 2016 Edition, Kindle Edition)

4.2 out of 5

Language : English
File size : 13522 KB
Text-to-Speech : Enabled
Screen Reader : Supported
Enhanced typesetting : Enabled
Print length : 301 pages

The Higgs Boson Discovery

One of the CMS detector's most significant achievements was its contribution to the discovery of the Higgs boson in 2012. The Higgs boson is a fundamental particle associated with the Higgs field, which is responsible for giving other particles their mass.

The CMS detector played a crucial role in observing and measuring the properties of the Higgs boson. It detected the decay products of the Higgs boson in various collision channels and measured its mass and decay rates. These measurements confirmed the existence of the Higgs boson and validated the Standard Model of particle physics.

Exploring the Properties of Known Particles

The CMS detector has also been instrumental in investigating the properties of various known particles, such as the top quark, the W and Z bosons, and the elusive gluon. By measuring their properties with high precision, scientists can test the predictions of the Standard Model and search for any deviations that may indicate new physics beyond the known theories.

For example, the CMS detector played a crucial role in measuring the mass of the top quark, which is the heaviest known elementary particle. The measurement of the top quark's mass helps constrain the mass of the Higgs boson and provides insights into the fundamental nature of particle interactions.

Searching for New Physics

Besides confirming the validity of the Standard Model, the CMS detector has been actively involved in the search for new particles and phenomena that lie beyond our current understanding. These measurements aim to answer questions like the nature of dark matter, the existence of extra dimensions, and the origin of the matter-antimatter asymmetry in the universe.

One of the primary aims of the CMS detector has been to explore the possibility of supersymmetry (SUSY), which proposes that each known particle has a heavier "superpartner." Although no direct evidence for supersymmetry has been found yet, the CMS detector has set stringent limits on the masses of various supersymmetric particles.

Understanding the Strong Force

The CMS detector is also crucial for studying the strong force, one of the four fundamental forces of nature. This force binds quarks together to form protons and neutrons, creating the building blocks of atomic nuclei.

By observing the production and decay patterns of particles influenced by the strong force, scientists can gain insights into the behavior of this fundamental interaction. The CMS detector's ability to measure the properties of particles produced in high-energy proton-proton collisions provides valuable data for studying the strong force and testing theoretical models.

The CMS detector at CERN's LHC has played a vital role in advancing our understanding of particle physics. Its measurements have contributed to significant discoveries, such as the observation of the Higgs boson and investigations into the properties of known particles. Additionally, the CMS detector has searched for new physics beyond the Standard Model and provided valuable insights into the strong force.

As the LHC embarks on its future runs and the CMS detector continues to improve, we can only anticipate more ground-breaking measurements and scientific breakthroughs. The combination of cutting-edge technology, brilliant minds, and an insatiable curiosity to unravel the mysteries of the universe will undoubtedly lead us to new frontiers in our quest for knowledge.

Top-Quark Pair Production Cross Sections and Calibration of the Top-Quark Monte-Carlo Mass: Measurements Performed with the CMS Detector Using LHC Run I Proton-Proton Collision Data (Springer Theses)
by Baby Professor (1st ed. 2016 Edition, Kindle Edition)

4.2 out of 5

Language : English
File size : 13522 KB
Text-to-Speech : Enabled
Screen Reader : Supported
Enhanced typesetting : Enabled
Print length : 301 pages

This thesis presents the first experimental calibration of the top-quark Monte-Carlo mass.  It also provides the top-quark mass-independent and most precise top-quark pair production cross-section measurement to date. The most precise measurements of the top-quark mass obtain the top-quark mass parameter (Monte-Carlo mass) used in simulations, which are partially based on heuristic models. Its interpretation in terms of mass parameters used in theoretical calculations, e.g. a running or a pole mass, has been a long-standing open problem with far-reaching implications beyond particle physics, even affecting s on the stability of the vacuum state of our universe.
In this thesis, this problem is solved experimentally in three steps using data obtained with the compact muon solenoid (CMS) detector. The most precise top-quark pair production cross-section measurements to date are performed. The Monte-Carlo mass is determined and a new method for extracting the top-quark mass from theoretical calculations is presented. Lastly, the top-quark production cross-sections are obtained – for the first time – without residual dependence on the top-quark mass, are interpreted using theoretical calculations to determine the top-quark running- and pole mass with unprecedented precision, and are fully consistently compared with the simultaneously obtained top-quark Monte-Carlo mass.

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