Skip to main content

CERN Physicists Searching for Production of Elusive Higgs-Boson Pairs

 



Physicists from the ATLAS Collaboration at CERN’s Large Hadron Collider (LHC) have released the most sensitive search for di-Higgs production and self-coupling yet, achieved by combining five di-Higgs studies of LHC Run 2 data.

Remember how difficult it was to find one Higgs boson? Try finding two at the same place at the same time. Known as di-Higgs production, this fascinating process can tell scientists about the Higgs boson self-interaction. By studying it, physicists can measure the strength of the Higgs boson’s self-coupling, which is a fundamental aspect of the Standard Model that connects the Higgs mechanism and the stability of our Universe. Searching for di-Higgs production is an especially challenging task.

It’s a very rare process, about 1,000 times rarer than the production of a single Higgs boson. During the LHC Run 2, only a few thousand di-Higgs events are expected to have been produced in ATLAS, compared with the 40 million collisions that happened every second. So how can physicists find these rare needles in the data haystack? One way to make it easier to look for di-Higgs production is to search for it in multiple places. By looking at the different ways di-Higgs can decay (decay modes) and putting them together, physicists are able to maximize their chances of finding and studying di-Higgs production. The new result from the ATLAS Collaboration is their most comprehensive search so far, covering over half of all possible di-Higgs events in ATLAS. The five individual studies in this combination each focused on different decay modes, each of which has its pros and cons. For example, the most probable di-Higgs decay mode is into four bottom quarks. However, Standard Model QCD processes are also likely to create four bottom quarks, making it difficult to differentiate a di-Higgs event from this background process. The di-Higgs decay to two bottom quarks and two tau leptons has moderate background contamination but is five times less common and has neutrinos that escape undetected, complicating physicists’ ability to reconstruct the decay.

The decay to multiple leptons, while not too rare, has complex signatures. Other di-Higgs decays are even more rare, such as the decay to two bottom quarks and two photons. This final state accounts for only 0.3% of total di-Higgs decays but has a cleaner signature and much smaller background contamination. By combining the results from searches for each of these decays, the ATLAS physicists were able to find that the probability that two Higgs bosons are produced excludes values more than 2.9 times the Standard-Model prediction. This result is at 95% confidence level, with an expected sensitivity of 2.4 (assuming that this process is not present in nature). They were also able to provide constraints on the strength of the Higgs boson self-coupling, achieving the best-yet sensitivity on this important observable. They found that the magnitude of the Higgs self-coupling constant and the interaction strength of two Higgs bosons and two vector bosons are consistent with Standard Model predictions.


International Research Conference on High Energy Physics and Computational Science

More details: -----------------
Visit Our Website : https://x-i.me/hep
Visit Our Conference Submission : https://x-i.me/hepcon
Visit Our Award Nomination : https://x-i.me/hepnom

Get Connected Here: ==================


Comments

Popular posts from this blog

Physicists observe a new form of magnetism for the first time

MIT physicists have demonstrated a new form of magnetism that could one day be harnessed to build faster, denser, and less power-hungry " spintronic " memory chips. The new magnetic state is a mash-up of two main forms of magnetism: the ferromagnetism of everyday fridge magnets and compass needles, and antiferromagnetism, in which materials have magnetic properties at the microscale yet are not macroscopically magnetized. Now, the MIT team has demonstrated a new form of magnetism , termed "p-wave magnetism." Physicists have long observed that electrons of atoms in regular ferromagnets share the same orientation of "spin," like so many tiny compasses pointing in the same direction. This spin alignment generates a magnetic field, which gives a ferromagnet its inherent magnetism. Electrons belonging to magnetic atoms in an antiferromagnet also have spin, although these spins alternate, with electrons orbiting neighboring atoms aligning their spins antiparalle...

new research in qauntum physics

         VISIT:https: //hep-conferences.sciencefather.com/          N ew research in  qauntum physics.                                                    Alphabet Has a Second, Secretive Quantum Computing Team Recent research in quantum physics includes the development of quantum computers, which are expected to be much more powerful than conventional computers and could revolutionize many aspects of technology, such as artificial intelligence and cryptography. Other research includes the development of quantum sensors for a variety of applications, including medical diagnostics, and the study of quantum entanglement and its potential to enable quantum computing and secure communication. Additionally, research is being conducted into the applications of quantum mechanics in materials science, such as unde...

Freezing light? Italian scientists froze fastest thing in universe, here’s how

In a rare occurrence, physics made it possible to control the fastest travelling element - light. Italian scientists have managed to freeze the light, as per reports. A recent study published in a British weekly journal reportedly revealed that light can exhibit ‘ supersolid behavior ’ a unique state of matter that flows without friction while retaining a solid-like structure. The research, led by Antonio Gianfate from CNR Nanotec and Davide Nigro from the University of Pavia, marks a significant step in understanding supersolidity in light. The scientists described their findings as “just the beginning” of this exploration, as per reports. In what can be termed as ‘manipulating photons under controlled quantum conditions ’, the scientists demonstrated that light, too, can exhibit this behaviour. (A photon is a bundle of electromagnetic energy which is massless, and travel at the speed of light) How did scientists freeze light? As we know, freezing involves lowering a liquid’s tempera...