Table of Contents
What can the Higgs boson decay into?
The Higgs boson can decay to a lepton pair and a photon in three main ways: the leptons can be produced via an intermediate Z boson (H→Zγ→ℓℓγ) or a virtual photon (H→γ*γ→ℓℓγ), or the Higgs boson can decay to two leptons (H→ℓℓ) with one lepton radiating a final-state photon.
How does Higgs boson work?
When two protons collide within the LHC, it is their constituent quarks and gluons that interact with one another. These high-energy interactions can, through well-predicted quantum effects, produce a Higgs boson, which would immediately transform – or “decay” – into lighter particles that ATLAS and CMS could observe.
What is the most common lepton?
electrons
Thus electrons are stable and the most common charged lepton in the universe, whereas muons and taus can only be produced in high energy collisions (such as those involving cosmic rays and those carried out in particle accelerators).
What do decaying Taus produce?
When they decay, they produce an invisible neutrino and either an electron, muon, or most commonly pions (i.e., hadrons made of quarks). The ATLAS collaboration specifically searched for pairs of decaying taus, focusing on cases in which both taus produced pions or where one produced either an electron or muon and the other produced pions.
How many types of Higgs bosons are there?
For instance, it suggests that there are at least five types of Higgs bosons, rather than just the one type that has been observed so far. While SUSY is theoretically appealing, there is no evidence that it applies to the real world, and if it does, the particles it predicts were presumably too heavy to be observed in previous experiments.
How did Atlas search for decaying Taus?
The ATLAS collaboration specifically searched for pairs of decaying taus, focusing on cases in which both taus produced pions or where one produced either an electron or muon and the other produced pions. The mTtot for the b-veto (left) and b-tag (right) categories of the τlepτhad channel (top) and τhadτhad channel (bottom).
Why is it so hard to measure Taus?
Taus are particularly difficult to measure, as they decay very quickly. When they decay, they produce an invisible neutrino and either an electron, muon, or most commonly pions (i.e., hadrons made of quarks).