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 4:49 PM

The case of Huawei: How that impacts Canada-China relations

In December 2018, Meng Wanzhou, the Chief Financial Officer for Huawei, a China-based tech company which is dominating the telecom supplies, was arrested in Vancouver, Canada on her flight stop to Mexico. This was done on a request from the USA with whom Canada has an extradition treaty. She was sought by the USA for allegedly dealing with Iran using an American banking system in spite of the sanctions placed on Iran by the country, in 2013. In May, Wanzhou lost the legal challenge to the extradition process, meaning that they will go ahead with the extradition proceedings.

Within days of Wanzhou’s arrest, two Canadian citizens in China were arrested on alleged accounts of spying. This is seen as a retaliation for the Wangzhou arrest by the Canadian Prime Minister Justin Trudeau, who says that there is a direct link between Wanzhou’s arrest and those of Michael Spavor and Michael Kovrig,  the Canadians who are detained in China. Though China has been tight-lipped about the link between the two, these two incidents are often raised jointly by the Chinese spokesperson. David Mulroney, former ambassador for Canada to China, has said that the officials in Beijing are mirroring the ongoing extradition case to that of the detained Canadians.

Although Mr. Trudeau has in the past repeatedly emphasized the need for good relations with China, and has enthusiastically worked on them to the point of agreeing to discuss a Canada-China extradition treaty. But the China-Canada relations already started souring much before the arrest after a trade deal fell through in 2017. Many major carriers in the country, some of which have been outspoken in their support of Huawei, have decided to shun the company and opt for western alternatives instead. One of them, Bell Mobility, even announced that it will use equipment from its Finnish rival, Nokia.

Huawei is considered a symbol for China’s technological prowess, and the arrest is seen by the Chinese Communist Party as an attack on its symbol of technological achievement. The Chinese state-owned newspaper the Global Times calls the act a “political persecution launched by the US, with the intention to contain China’s high-tech development.” The China Daily also criticized the court ruling as unfair and potentially harmful in mending the Canada-China relations.

There has also been a backlash from legal experts and family members of the detained Canadians on the Canadian policy of letting the extradition charges proceed and not going with a prisoner swap. Mr. Mulroney, however, feels that it would legitimize “hostage diplomacy”, which would put at risk all traveling Canadians for arbitrary arrests to gain political leverage. There is a stark difference between the condition of the hostages and that of Meng Wanzhou, for while the two prisoners spend their days in small cells in isolation, interrupted by interrogation and bland meals, Wanzhou lives in her Vancouver mansion, being happy about the fact that she can spend more time reading and oil painting, now.

The Canadian government is also claiming that it has to let the extradition process go on without political interference as to not compromise the independent, legal decision of surrendering the Huawei CFO. Mr. Mulroney has said that “it wouldn’t be the right thing to do. It would compromise the integrity of both our democracy and our justice system,” and that their values need to count for something. Brian Greenspan, a Toronto lawyer with experience on extradition cases, has said that the government has the power to withdraw from the extradition case, and that the lessons from a previous case in which political pressure affected an international case, are being applied wrongly here.

There are many sides to this tension, complicated by previous feuds, economic decisions, the detentions of the Canadians and Wanzhou and the difference between the political and the legal, and the many opinions on whether it should be that way.

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