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 4:52 PM

Persecution of Uighur Muslims in China and the silence of Muslim Countries

Uighur are natives of  Xinjiang province of China who are Muslims and regard themselves as culturally and ethnically close to Central Asian nations. Xinjiang province has been under the control of China since it was annexed in 1949 and many Uighurs still identify their homeland by its previous name, East Turkestan. There are around 11 million Uighurs in Xinjiang and China claims that Uighurs hold extremist views that are a threat to national security.

In 2017, the Xinjiang government passed a law prohibiting men from growing long beards and women from wearing veils and dozens of mosques were also demolished.

As per the report of UN Committee on the Elimination of Racial Descrimination, the Chinese government has detained at least one million Uighurs in the detention camps in Xinjiang, China. After denying the existence of the camps for a long time, when the photos of the camps emerged, the Chinese government called them “re-education centres'' for Uighurs though the former detainees said they were detained, interrogated and beaten because of their religion, and not “re-educated.”

In July 2019 to the U.N. Human Right Council, 22 countries, mainly European countries, responded to “disturbing reports of large scale arbitrary detentions of Uighurs” and condemned the Chinese leadership.

Four days later, 37 countries, defended China’s “remarkable achievements in the field of human rights” by protecting the country from “terrorism, separatism and religious extremism.” The list of the 37 countries also included Muslim-majority countries like Saudi Arabia, Pakistan, Egypt, Qatar etc.

At the end of October 2019, 23 countries including France, the United Kingdom, United States denounced the repression of the Uighurs at the UN Committee on Social, Humanitarian and Cultural Affairs. Nevertheless, Beijing won the support of 54 countries, who praised the Communist Party’s management of Xinjiang.

In February 2019, Saudi Arabia showed their “respect” for Xi Jinping, the Chinese leader before they signed major commercial contracts with China. Egypt wants Beijing to finance its infrastructure and hence allowed the Chinese police to interrogate Uighur exiles on its soil in 2017. Pakistan, who has talked about the mistreatment of Rohingyas, has been silent on Uighurs since the Chinese Belt and Road Initiative is going on in the country.

Even Iran, who issues occasional criticism wants support from China and hence keeps the criticism coded. “There is a lot of sympathy for the Uighurs in Turkey, but the reality is that Erdogan needs China as an ally for economic reasons and to counteract the West’s diplomatic pressure on issues like Syria,” said Rémi Castets, a political scientist.

In 2017, the Organisation of Islamic Cooperation responded very differently to the Rohingya Crisis (Myanmar’s military crackdown on the country’s Rohingyas), where countries like Saudi Arabia, Iran and Turkey defended the rights of the Muslim minority group in Myanmar and actively condemned the treatment of Rohingyas in the UN Human Rights Council in Geneva.  

The question here arises is that contrary to the sentiments of their citizens, why do Muslim states stay silent over China’s abuse of the Uighurs?

Sophie Richardson, the director of China at Human Rights Watch, has a short and simple answer — there is less solidarity for Uighur than Rohingyas or Palestinians because China has managed to win these countries’ support due to its economic might.

Only time will tell how long these countries will continue to give preference to the economic interests over the anti-China sentiments of the citizens.

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