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

How COVID-19 helped Netanyahu beat Benny Gantz for Israeli prime ministership

In March 2020, when COVID-19 was causing the near collapse of health systems across the world, Israel had just voted third time in the parliamentary election for the third time in less than a year. This was so because no political party was able to muster the majority in Knesset (Israeli parliament) after earlier elections in April 2019 and Sept 2019. Benjamin Netanyahu has been acting Prime minister since the time when he went for the dissolution of Knesset December 2018 with a hope of securing an extended majority for his right wing coalition. However he failed to secure even the simple majority in three elections on April 19, Sept 19, and March 20. Then came the COVID-19 and he sensed an opportunity to make a comeback from the brink of political disaster to reclaim the prime ministership of Israel.

The COVID-19 pandemic tested the Israeli citizens just like the other countries and  Benjamin Netanyahu kept on telling that unless it is effectively controlled, there will be devastation not seen since the Middle Ages. He also stressed that even the First world countries such as the US and UK are at the brink of losing control. Many Israelis expressed admiration towards Netanyahu’s quick response to the pandemic which helped to contain the pandemic in earlier stages. They flattened their curve by shutting down public places such as parks, schools, educational institutions, and the hotspot areas. He followed two stage strategies — first, to locate and isolate the infected population and then to engage the healthy population in economic activities during the conditions of a semi-lockdown. These steps were taken to save the economy. His plan also carried a huge amount of tests in the hope that it could be established that some people were developing antibodies to resist the virus and could safely be “freed” from isolation. Although the steps being acknowledged, they still raised a lot of questions against Netanyahu. He was supposed to be facing charges for breach of trust and bribery in the month of March. The court shutdown ordered by Israeli Law minister delayed Netanyahu’s charges by two months. Israel also used the cell phone of citizens to monitor their movement to track the spread of pandemic for which he was criticised for breaching the citizen’s privacy. Yohanan Plesner, the president of the Israel Democracy Institute said that Israelis trust the Shin Bet to protect them and not to abuse that trust, and the cellphone monitoring may have serious long-term effects on that trust. Netanyahu, however, defended himself with usual combativeness by stating that the courts were under a temporary shutdown and he has received permission from the General Attorney for cellphone usage data which was valid for 14 days. He also said “If the Shin Bet is to

infringe on our basic privacy, they could have done it many years ago”.

After managing to convince the citizens that he had handled the COVID-19 situation effectively, he quickly approached the rival Benny Gantz with a proposal to form an “emergency unity government”. As part of the deal he offered to share the power with Gantz’s Blue and White party for three years during which Netanyahu was to be prime minister and Benny Gants Dy prime minister for the first 18 months and the role reversal afterwards. He kept on harping the disastrous consequences of the virus and mentioned “It could affect 60-80% of the population” and said “nobody knows” how devastating the virus would ultimately prove. 

It was not easy for Benny Gantz to accept the proposal to align with Netanyahu as his whole campaign was on the issue of never supporting Netanyahu. However Netanyahu, who is acknowledged by friends and foes alike as a shrewd politician willing to go to any extent in safeguarding his own interest, finally won the war of attrition. Benny Gantz accepted the deal offered by Netanyahu and agreed to let him continue to be the prime minister for the first 18 months of the alliance period. The COVID-19 calamity has effectively turned into an opportunity for Netanyahu to hold on to the power and continue to be the prime minister of Israel.

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