Beautiful Higgs decays

Categories: CMS/LHC
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Published on: April 24, 2019

The discovery of the Higgs boson in 2012 explained something no less foundational than how subatomic particles gain mass. The particle’s discovery marked the beginning of a comprehensive effort to measure its properties. In June 2018, the CMS collaboration reported observing the Higgs boson produced in association with a pair of top quarks. This represented the first direct measurement of the Higgs boson coupling to quarks, a building block of matter. Now the CMS collaboration announces another major observation: The Higgs boson decays into bottom quarks, also known as the beauty quarks.

This event display from CMS shows a proton-proton collision inside the Large Hadron Collider that has characteristics of a Higgs decaying into two bottom quarks. Image courtesy of CMS

By Meenakshi Narain.

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Chopping beam to your taste

August 21, 2018 | Leah Hesla and Alexander Shemyakin

For lunch, do you enjoy having your tomato whole, in slices or finely chopped? It probably depends on the dish: The tomato could serve as a standalone fruit snack, as part of a sandwich or as a salad topping. Similarly, different Fermilab experiments may want particles beams coming to them in different chunks. Now they have a chopping “knife” to prepare the beam to their taste: the new beam chopper for the future Fermilab linear accelerator.

This is the assembled 200-ohm kicker for the MEBT chopper. Photo: Reidar Hahn

Extracting signals of elusive particles from giant chambers filled with liquefied argon

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Published on: April 3, 2019

The central piece of the MicroBooNE detector is a liquid-argon time projection chamber — a bus-sized tank filled with argon (kept liquid at a biting minus 303 degrees Fahrenheit). Photo: Reidar Hahn

A revolutionary new kind of neutrino detector sits at the heart of the MicroBooNE experiment at Fermilab. In two new papers published by the Journal of Instrumentation, the MicroBooNE collaboration describes how they use this detector to pick up the telltale signs of neutrinos. The papers include details of the signal processing algorithms that are critical to accurately reconstruct neutrinos’ subtle interactions with atoms in the detector.

Read about the research described in the papers on Brookhaven’s news site.

By Karen McNulty Walsh of Brookhaven National Laboratory

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