Friday, July 17, 2020

Discovery of a new particle: A Charming Tetraquark

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Hardi Talwani

Article Title

Discovery of a new particle: A Charming Tetraquark

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Global Views 360

Publication Date

July 17, 2020

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The Large Hadron Collider

The Large Hadron Collider | Source: Anna Pantelia via CERN

While the world is horrified by the novel Coronavirus, scientists at the European Centre for Nuclear Research (CERN) announced the discovery of a never seen before tetraquark. Any finding in particle physics is a phenomenal one because it could tell us a lot about the origins of the universe and how everything came to be. And this discovery is quite charming and quarky (quirky).

Quarks are the elementary particles so any further division of these particles is not possible. This means everything in the universe is ultimately a combination of Quarks. Any new discovery of Quarks  therefore increase our understanding about the origin of universe

When three Quarks come together, they form familiar particles known as Baryons, for instance, protons and neutrons, found in the nucleus of an atom. A tetraquark, in particle physics, is an exotic meson composed of four quarks.

Murray Gell-Mann, recipient of the 1969 Nobel Prize in Physics for his work on the theory of Elementary particles, chose the name ‘Quark’. Another scientist,  George Zweig from CERN also proposed the Quark theory independently of Gell-Mann.

All the new particles are detected using particle accelerators where particles are accelerated at almost the speed of light and collide to look into their subsets. It is like knocking two rocks together so that they break into smaller constituents.

The most recent tetraquark, named X (6900) was discovered by CERN physicists while working on LHCb (Large Hadron Collider beauty experiment). The already known tetraquarks contain a particular combination of two relatively heavy quarks and two light Quarks. On the other hand X(6900) consists of four heavy Quarks: two Quarks and two anti-Quarks.

This exclusive particle made of unusual combinations is a perfect setting for understanding the fundamental force of nature known as Strong Interaction. The strong force is vital to comprehend as it binds together protons, neutrons and the nucleus that ultimately make up matter. Another perk of X(6900)  is its relatively heavy mass, so these are simpler to look at and are more stable as compared to notoriously fast moving-lighter ones.

The paper written by 800 scientists is yet to be peer-reviewed. The bump observed has a statistical significance of more than five sigma (standard deviations) that is good enough to claim the discovery of a new particle.

In any scenario, this unusual discovery will serve as a piece for completing the puzzle of our universe while serving as evidence of the presence of new particles not yet found.

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February 4, 2021 4:41 PM

Black Lives Matter: Why "All Lives Matter" is a False Equivalence

The phrase “All Lives Matter”, used in response to the slogan “Black Lives Matter”, has been causing a lot of controversy. The slogan is sometimes used by “colour-blind” people, who do not see colour as a basis of any of their decisions, and when they hear “Black lives Matter”, they want to add white lives to the mix, not understanding that race causes significant differences in what people face with respect to discrimination. 

In one of the incidents, a man spray-painted ‘White Lives Matter’ on the statue of Arthur Ashe, an African American Tennis legend, who was the first black Wimbledon men’s singles champion. After the man left, some people spray-painted “Black Lives Matter” over the previous paint. The man returned in a while to wipe off that message, and when asked why he had painted “white lives matter” on the statue. According to the video, the man replied "Don't all lives matter? Why is it okay to spray paint on this statue 'black lives matter,' but not 'white lives matter'? What's the difference? They all matter. Everybody matters, right?"

However, John Hayward on Breitbart throws a different light on the use of the all lives matter slogan. It talks about several instances of how people and organizations have used the phrase, like how the local authorities in Frankton, Indiana tried to have it on the side of the police cars out of general goodwill, and did not realize that the phrase was offensive to the Black Lives Matter movement.

The phrase “All Life Matters” may have been used as a slogan for joining all hands together, and expressing the fundamental right to equality. However it is found to be misguided and offensive by many people because they feel that the phrase invalidates the specific difficulties faced by the black community. For explaining this, they draw a comparison: if there is one house burning, if the other houses call out that they want the water poured on them too, that’s just counterintuitive and ignoring the burning house. Another comparison is that at a dinner table, a child has half a portion and the other has a whole. When giving another half a portion to the child with less food, if the other child demands half a portion too, it is evident that the child with the full portion is ignoring the fact that the other one has only the half. 

The intention about the usage of the phrase “All Lives Matter” doesn’t matter; it still negatively affects the “Black Lives Matter” movement. Speaking of “All Lives Matter” in response to someone asserting that “Black Lives Matter” is walking over the struggles that black people specifically face and it is a false equivalence.

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