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 4:36 PM

Black Lives Matter: Solidarity protests in Western Europe

The killing of the African-American George Floyd in the hands of Minneapolis police commanded world attention. It witnessed Pan-American protests against police brutality and racism. Countries across the world have stood in support of these protests against racial violence. These protests in America have triggered a number of protests across Western Europe to localise them and condemn racism in their own countries.

Protests against racial violence and police brutality drew large numbers across European capitals and other prominent cities as well. Paris protests alone saw an estimated 20000 people near the Eiffel Tower who protested against the death of George Floyd. These protesters tried to localise the issue of racial violence and police brutality by taking up the case of Traoré, a young black man whose family claims that he died due to suffocation under police custody at Persan (north of Paris) in 2016. These protests have been going on consistently for over a week. Despite the police ban on demonstrations in Paris due to the risk of COVID-19, the demonstrations couldn’t be curbed. Parallel protests were also reported in other cities of France like Lyon, Rennes and Marseille.

Berlin also has been sustaining its ‘Black Lives Matter’ protests for over a week. Demonstrations were held in other German cities such as Cologne, Frankfurt and Dusseldorf. The Bayern Munich footballers wore T-shirts with slogans that read ‘Red card against racism- Black Lives Matter’ in their match against Leverkusen to raise awareness against racial violence. Various German activists believe Floyd’s death has not only triggered anti-racist protests but also multiple questions regarding equitable distribution of resources and representation of diverse races that co-habit in Germany.

In the United Kingdom, too, despite the COVID-19 risk, a large number of protestors stood in solidarity with the U.S protests. In Bristol, demonstrators pulled down the statue of slave trader Edward Colston on 7 June, 2020. Even though these protests were against racial violence, the chords of the protests mainly struck with issues of blacks during COVID-19. British government data showed that blacks living in British were four times more likely to die from COVID-19 as compared to whites. This discrimination by the virus can be attributed to the institutionalised nature of racism and the lack of equitable access to resources for minorities living in Britain.

Protests were held widely in Spain. The U.S embassy outside Madrid has become one of the hotspots for protestors to gather. Hundreds gathered to mourn the death of Floyd and observed silence for him. The city of Budapest too observed silence and chanted songs outside its U.S embassy.

European media has also played a key role in actively condemning Trump for his actions of using military force to tackle the protests. While the French Newspaper Le Monde in its editorials has dubbed Trump as ‘President of division’ the Spanish newspaper El Pais’s headlines read ‘The U.S. Faces Its Worst Racial Conflict in Half a Century’. Trump’s actions to use federal force and active duty military personnel have made the European media to cover the protests more extensively. Newspapers coupled with social media have acted as catalysts in spreading the cause of the protests at a much faster rate.

Floyd’s killing sparked protests against racial violence and systematic racism around the world. However, it resonated at a deeper level with Western European countries primarily due to their rising number of immigrants from African and Arab countries. These countries, for decades, have struggled with accommodating these minorities equally with the mainstream population. The approach to localise these protests has helped to not only denounce racial violence in America but also in their own home country. The nature and extent of these protests have pointed out that governments no longer have the luxury of gradualism and have to instead take up swift actions to eliminate institutionalised racism and police brutality.

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