Lhc discoveries
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Discoveries at the Large Hadron Collider (LHC)
Introduction to the LHC: A Discovery Machine
The Large Hadron Collider (LHC) at CERN is the most powerful particle accelerator ever built, designed to explore the high-energy frontier of particle physics. It collides proton beams at a center-of-mass energy of 14 TeV and heavy ions at 2.8 TeV per nucleon, with unprecedented luminosity . The LHC is often referred to as a "discovery machine" due to its potential to uncover new particles and phenomena .
Discovery of Doubly Heavy Tetraquarks
One of the significant areas of research at the LHC is the discovery potential of stable and near-threshold doubly heavy tetraquarks. These include double-bottom tetraquarks such as ( T[u\bar{d}\bar{d}]{bb} ), ( T[u\bar{s}\bar{s}]{bb} ), and ( T[d\bar{s}\bar{s}]{bb} ), which are expected to be stable against strong decays. The production cross sections for these tetraquarks have been estimated, showing excellent discovery potential at the LHC .
Supersymmetry and Gluino Searches
Supersymmetry (SUSY) is a well-motivated extension of the Standard Model, and the LHC has been pivotal in searching for supersymmetric particles. One promising channel for early SUSY discovery involves events with a high multiplicity of third-generation quarks, such as four top quarks. This channel is robust and provides information on the gluino mass, cross section, and spin, with a reach for gluinos of about 650 GeV at 7 TeV LHC energy . Additionally, the LHC has explored the minimal anomaly-mediated supersymmetry breaking (mAMSB) scenario, with discovery contours reaching up to 2.8 TeV in squark mass and 2.1 TeV in gluino mass .
Higgs Boson and CP-odd Higgs Discoveries
The LHC has also been instrumental in the search for the Higgs boson and its variants. The discovery potential of the lightest CP-odd Higgs boson ( a_1 ) of the Next-to-Minimal Supersymmetric Standard Model (NMSSM) has been evaluated, showing sizable production and decay rates that could help in extracting the ( a_1 ) signal over certain parameter spaces .
New Heavy Quarks and Fourth Family
The LHC has the potential to discover new heavy quarks, such as vector-like quarks coupled to the third generation. These quarks, including ( T ), ( B ), ( X ), and ( Y ), can be identified through various final states containing charged leptons and b quarks. The single lepton channel offers the best discovery potential, with 5 sigma discovery luminosities ranging from 0.16 fb^-1 to 1.9 fb^-1 for different quark configurations . Additionally, the LHC may provide evidence for a fourth family of particles, which could be the first indication of new strong interactions .
Conclusion
The LHC continues to be a cornerstone in the field of particle physics, offering unprecedented opportunities for discovering new particles and phenomena. From stable doubly heavy tetraquarks to supersymmetric particles and new heavy quarks, the LHC's discoveries are pushing the boundaries of our understanding of the universe. As research progresses, the LHC remains a vital tool in the quest for new physics.
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