CERN – European Organization for Nuclear Research logo.
31 Aug 2018
A proton–proton collision event with two emerging-jet candidates. (Image: CMS/CERN)
Quarks are the smallest particles that we know of. In fact, according to the Standard Model of particle physics, which describes all known particles and their interactions, quarks should be infinitely small. If that’s not mind-boggling enough, enter dark quarks – hypothetical particles that have been proposed to explain dark matter, an invisible form of matter that fills the universe and holds the Milky Way and other galaxies together.
In a recent study, the CMS collaboration describes how it has sifted through data from the Large Hadron Collider (LHC) to try and spot dark quarks. Although the search came up empty-handed, it allowed the team to inch closer to the parent particles from which dark quarks may originate.
One compelling theory extends the Standard Model to explain why the observed mass densities of normal matter and dark matter are similar. It does so by invoking the existence of dark quarks that interact with ordinary quarks via a mediator particle. If such mediator particles were produced in pairs in a proton–proton collision, each mediator particle of the pair would transform into a normal quark and a dark quark, both of which would produce a spray, or “jet”, of particles called hadrons, composed of quarks or dark quarks. In total, there would be two jets of regular hadrons originating from the collision point, and two “emerging” jets that would emerge a distance away from the collision point because dark hadrons would take some time to decay into visible particles.
In their study, the CMS researchers looked through data from proton–proton collisions collected at the LHC at an energy of 13 TeV to search for instances, or “events”, in which such mediator particles and associated emerging jets might occur. They used two distinguishing features to identify emerging jets and pick them out from a background of events that are expected to mimic their traits.
Large Hadron Collider (LHC). Animation Credit: CERN
The team found no strong evidence for the existence of such emerging jets, but the data allowed them to exclude masses for the hypothetical mediator particle of 400–1250 GeV for dark pions that travel for lengths between 5 and 225 mm before they decay. The results are the first from a dedicated search for such mediator particles and jets.
Note:
CERN, the European Organization for Nuclear Research, is one of the world’s largest and most respected centres for scientific research. Its business is fundamental physics, finding out what the Universe is made of and how it works. At CERN, the world’s largest and most complex scientific instruments are used to study the basic constituents of matter — the fundamental particles. By studying what happens when these particles collide, physicists learn about the laws of Nature.
The instruments used at CERN are particle accelerators and detectors. Accelerators boost beams of particles to high energies before they are made to collide with each other or with stationary targets. Detectors observe and record the results of these collisions.
Founded in 1954, the CERN Laboratory sits astride the Franco–Swiss border near Geneva. It was one of Europe’s first joint ventures and now has 22 Member States.
baby boomers: climate change & bisexuals aren’t real also i’m better than u
gen x: !!! kids these days are spending too much time on the phones!! they’re faking the depression & anxiety !!
millennials: people need to realize the importance of our truths and struggles; rent prices, shitty education, decreased job opportunities, and discrimination, are causing genuine problems among today’s population
gen z: ok i’m ready to eat fruit, be gay, go to the moon, and die lets go fuckers
you literally captured whats called “ball lightning” which is the rarest form of lighting
its so rare that we dont even know how it forms other than by heat, static electricity, and humidity
storm elemental it is
look guys this is how nature-based deities and spirits come about this is ridiculous
Are you aware that the first-ever video footage of ball lightning outside a laboratory was taken in 2014 and there are only like 3 or 4 videos like this in existence and this might be the most close-up one
Stu, let me ask you a question: how did you not realize until then that you had too many eggs? Nobody sells eggs in a big cloth-covered basket, so you must have done that yourself. That means you spent god-knows-how-long opening up twelve whole cartons of eggs, carefully placing each egg one-by-one inside a big basket, and then covering it with a big picnic cloth… and at no point- at no point- did you ever stop and think “gee, there might be TOO MANY FUCKING EGGS HERE”
I invite my closest friends and family to a gender reveal party, but when I open the box with maniacal flourish instead of pink or blue balloons, a television screen is revealed.
I dim the lights remotely as we hear Cate Blanchett say, “The world is changed. I feel it in the water.”
Too late, they realise.
The pregnancy? A scam.
The Lord of the Rings editions? Extended.
The doors? Locked.
Is popcorn and pepsi provided?
Bold of you to assume that I would count anyone with a preference for Pepsi amongst my closest friends and family
rip tumblr 