Discussion and solitude in the Theoretical Ph At CERN. Four decades of gluons. Untangling the origin of string theory. Also On Physics. ATLAS gives new insight into the internal str BASE breaks new ground in matter—antimatter c Bismuth isotopes also alternate from spheres ALICE takes the next step in understanding th ALICE 3 workshop: towards a next-generation h A triple treat from CMS.
We also look for decays to combinations of particles forbidden in the Standard Model. During this run, 13 TeV proton-proton collisions have been producing approximately 30 times more Higgs bosons than those used in the Higgs boson discovery.
As a result, more and more results have been obtained to study the Higgs boson in greater detail. Over the next few years, analysis of the large Run 2 dataset will not only be an opportunity to reach a new level of precision in previous measurements, but also to investigate new methods to probe Standard Model predictions and to test for the presence of new physics in as model-independent a way as possible. This new level of precision will rely on obtaining a deeper level of understanding of the performance of the detector, as well as the simulations and algorithms used to identify particles passing through it.
It also poses new challenges for theorists to keep up with the improving experimental precision. Among other measurements, this will open the possibility to investigate a very peculiar property of the Higgs boson: that it couples to itself.
Events produced via this coupling feature two Higgs bosons in the final state, but they are exceedingly rare. Thus, they can only be studied within a very large number of collisions and using sophisticated analysis techniques. Looking more generally, the discovery of the Higgs boson with a mass of GeV sets a new foundation for particle physics to build on.
Many questions remain in the field, most of which have some relation to the Higgs sector. For example:.
He has worked both as a theoretical and experimental physicist, and is a founding member of ATLAS where he performed, among others, combined Higgs boson analyses and led the Higgs working group. Both enjoy communicating particle physics to non-specialists.
The higher the luminosity, the more events per second. Processes with larger cross-sections occur more often than processes with small cross-sections.
Read the press statement on this result here. Tags: Higgs boson. The Higgs boson: the hunt, the discovery, the study and some future perspectives 4 July By Heather Gray ,. The origins of the Higgs boson Many questions in particle physics are related to the existence of particle mass. The excess of events over the background prediction around GeV is consistent with predictions for the Standard Model Higgs boson.
The excess of events around GeV is consistent with Standard Model predictions for the Higgs boson. Figure 4: The measured interaction strength as a function of the mass of different particles in the Standard Model. The minimal version of supersymmetry predicts that the Higgs boson mass should be less than GeV, depending on some other parameters.
Is it a coincidence that the observed value sits exactly at this critical value, hence still marginally allowing for this supersymmetric model? Several models have been recently proposed where the only link of Dark Matter with regular matter would be through the Higgs boson. Stability of the universe: the value of GeV is almost at the critical boundary between a stable universe and a meta-stable universe.
A meta-stable system possesses another baseline state, into which it can decay anytime due to quantum tunnelling. The phase transition: the details of this transition may play a role in the process which led our universe to be entirely matter and not contain any anti-matter. Present calculations with the Standard Model Higgs boson alone are inconsistent with the observed matter-antimatter asymmetry.
Is this a call for new physics or only incomplete calculations? Are fermion masses all related to the Higgs boson field? If yes, why is there such a huge hierarchy between the fermion masses spanning from fractions of electron-volts for the mysterious neutrinos up to the very heavy top quark, with a mass on the order of hundreds of billions of electron-volts?
The higher the luminosity, the more events per second [2] The cross-section is a measure of the probability for that process to occur during any proton-proton collision. The High-Luminosity upgrade of the LHC plans to deliver a dataset 20 times larger than the one used here. If HH production behaves as predicted by the Standard Model, it will be observed in this huge dataset — allowing LHC researchers to make a more quantitative statement on the size of the Higgs self-coupling and the nature of the Higgs potential.
Charged-particle tracks are shown in green, the two candidate b-jets are shown as red cones, and the two candidate photons are shown as cyan towers. Physics Briefing. Tags: winter conferences ,. Figure 1: Sketch of the HH invariant mass with the two leading contributions from the triangle left and box right Feynman diagrams. Image: F. The dashed line shows the expected limits, and the solid line shows the observed limits.
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