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 4:57 PM

Have the French finally started talking about the racism in their country?

France, which boasts about being a color-blind nation, isn’t truly what it asserts. For a non-white citizen living in France, being subjected to bias and ethnic profiling at the hands of some insensitive police officers is a real possibility.

Structural and institutional racism is evident in France, where children as young as 10 years old have to routinely endure police stops, even without being suspicious of any illegal activity. These unlawful stops often involve humiliating body pat-downs and searches of personal belongings are   usually left unrecorded by any agency.  

A speaker at the French media coverage of the Middle East at the Alliance Française in Beverly Hills, Slimane Zeghidour, in an interview with the ‘French Morning’ agency said that, “there is a very strong prejudice of class that is translated to a stigmatization of people”, adding that these targeted people are mainly immigrants from Maghreb or Africa.

The brutal killing of George Floyd in the US kicked off huge protests against the institutionalized racism in France as well. Hundreds of people protested at the Presidential Palace in Paris while 2500 people attended a rally in Lille, 1800 in Marseille, and 1200 in Lyon displaying  placards similar to those in the US – ‘Black lives matter’ and ‘I can’t breathe’.

Alongwith protesting the death of George Floyd, people in France also drew the attention to the murder of a 24-year old black man Adama Traoré in police custody in July 2016 in their own country. The police officers involved in this incident were exonerated which triggered mass protests at that time in France.

Such blatant racism and ethnic prejudice is the result of a sense of supremacy ingrained in the collective psyche of white citizens who constitute the overwhelming majority in France. Instead of acknowledging their racial bias, a large section of whites have started blaming the minorities as the cause of their economic and cultural problems.

When a black national icon of France, Lilian Thuram, the most capped player in the history of the French national team, spoke about the racism incident in a football match in Italy, it caused a massive storm in France.

Thuram said, it is not the world of football that is racist, but "Italian, French, European and, more generally, white culture" is racist. He further stated that "Whites have decided they are superior to blacks and that they can do anything with them," and “It is something that has been going on for centuries unfortunately and to change a culture is not easy."

Thurham was highly criticized and branded ‘anti-white racists’ by the far-right extremists and their sympathetic journalists. This criticism later expanded in the mainstream media as well.

Not only the far-right extremists, even the government flatly denies the existence of extreme violence and institutional discrimination in France.

“I don’t believe we can say that France is a racist country,” says Sibeth Ndiaye, a French Government spokesperson to the journalists after a cabinet meeting, when people took to streets in June 2020, all the while justifying that France cannot be compared with the USA.

Well, with fueling protests and awareness, things are slowly changing and the taboo around race and white supremacy is losing its grip. People have gradually started to acknowledge their identity as ‘white’ or ‘black’ and the mainstream media is now talking about race.

As Mr. Fassin, a sociology professor at the University of Paris says, “My hope is we'll realize that talking about race isn't against democracy but rather about democracy”, he reflects optimism for a better tomorrow.

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