Friday, July 17, 2020

Discovery of a new particle: A Charming Tetraquark

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Hardi Talwani

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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 5:16 PM

Catalonian Secessionist Movement in Spain: The Genesis and Present Status

Catalonia with its capital in Barcelona, is one of the wealthiest and historically significant regions of Spain. The region is home to around 7.5 million people and has its own official language, parliament, flag, and anthem.

The region was granted considerable autonomy by the 1978 constitution of Spain. The legislature of the autonomous Catalan region passed Statute of Autonomy which was approved by the national parliament and ratified by the Catalan electorates in a referendum in 2006.

What’s the latest buzz surrounding the region?

Pro-referendum rally in Montjuic, Barcelona | Source: Amadalvarez via Wikimedia

On 1st October, 2017, a referendum was organized in Catalonia for independence despite opposition from the central government of Spain. Owing to the resistance from Madrid, the voter turnout was just a lowly 43%. However, the Yes option won by a massive 90% margin.

Under a tense environment, the separatist majority in the Catalan parliament announced independence on 27th October, 2017. However, Madrid reacted strongly to the move by dissolving the Catalan parliament under Article 155 emergency powers and initiated a violent crackdown on the protesters and separatist leaders in the region. Nearly three years since the referendum, Catalan leaders remain in jail or in exile. The entire crisis has been termed as Spain’s biggest political-crisis since 1975, when democracy was restored post General Franco, the military dictator’s death.

Catalonia- A brief history

Supporters of General Franco | Source: Wikimedia

Catalonia as a region enjoyed a high level of autonomy before General Francisco Franco led Nationalist forces overthrew the Spanish democratic republic in 1936. Overthrow of Spanish democratic republic resulted in a three year long Spanish Civil War which raged from 1936 to 1939. In 1938 when the country was going through a phase of overhyped nationalist sentiments during the civil war, General Franco abolished the region's autonomy. General Franco ruled Spain as a dictator from 1936 till he died in 1975. After his death, Spanish democracy and Catalonian autonomy were restored once again.

There were calls for independence of Catalonia from fringe elements from time to time, but it was not supported by the mainstream political or social organisations. However this changed when Spain’s Constitutional Court issued a landmark ruling In 2010 and declared some of the articles of the 2006 Statute of Autonomy as unconstitutional.

There were massive protests in Catalonia against the Supreme court ruling, specially against the provision which place the distinctive Catalan language above Spanish in the region and ruling that “The interpretation of the references to ‘Catalonia as a nation’ and to ‘the national reality of Catalonia’ in the preamble of the Statute of Autonomy of Catalonia have no legal effect.”

Why do Catalans insist on independence?

Concert for Catalonian Independence | Source: Núria via Flickr

A lot of Catalans believe that Catalonia has a moral, cultural and political right for self-existence and that it has long put Spain’s best economic interests in priority despite not getting enough in return. Many Catalans are also unhappy with the decision of Spanish SC to declare the 2006 Statute of Autonomy as unconstitutional. They argue that it would have given Catalonia greater independence and by annulling it Spain is interfering with the internal affairs of Catalonia.

A timeline of Catalonia’s modern independence movement

Carles Puigdemont, the regional President of Catalonia | Source: Wikimedia

On September 11, 2012, thousands of protesters gathered in Barcelona to show support for the independence movement. Later in November, signaling a major shift in the politics of the region, the majority of the seats were won by pro-independence parties in the Catalan regional parliament.

On November 9, 2014, Catalan authorities held a mock vote for an independence referendum despite a prohibition order from Madrid. The then regional president Artur Mas, along with three other Catalan cabinet members were later fined for disobedience and misuse of public funds.

On June 9, 2017, Carles Puigdemont, the then regional president of Catalonia announced plans for a ‘binding’ independence referendum. Madrid declared the referendum as illegal and Spanish Prime Minister Mariano Rajoy vowed to stop the vote.

On October 1, 2017, the referendum was organized under a tense atmosphere which saw a lowly 43% voter turnout. Reportedly the Civil Guard and National Police forces raided a few polling stations and clashed with the voters even as the Catalan Police mostly stood down. Puigdemont claimed a landslide win for secession in the referendum.

On October 27, 2017, the Catalan parliament declared Catalonia as an independent republic even as no foreign nation recognized the declaration. Spain PM Rajoy immediately invoked constitutional powers to take over Catalonia and fired Puigdemont and his cabinet members.

On October 31, 2017, Puigdemont and a few of his deposed cabinet members fled from Catalonia to Belgium. Puigdemont successfully fought against his extradition to Spain and established his residence in Waterloo.

Aftermath of a failed independence attempt

Ever since Puigdemont fled to Belgium, Spain took control over the region and has sent all the major accomplices of Puigdemont and pro-independence leaders to jail. Most of them have been served with lengthy jail terms for being a part of the controversial independence referendum of October 2017.

Although direct rule was lifted after the formation of the new Catalan government in June 2018, the single biggest winning party was the center-right, pro-unionist Citizens party, which took 37 seats. Three pro-independence parties also secured around 70 seats combined in the 135-seat regional parliament election. Protests for independence have mostly faded away in the region.

What happens next?

The current Catalan regional president, Quim Torra has called for the Catalans to greet guilty verdicts with a ‘huge show of nonviolent civil disobedience’. Spain’s Prime Minister, Pedro Sanchez has been much less brutal compared to his predecessor Rajoy. However, he has maintained that any negotiations will have to be adhered to by the constitution while ruling out the possibility of a referendum.

The political tussle between Puigdemont and his allies who favor pressurizing Madrid with provocative moves, and the Catalan Republic Left which has sought to employ a less confrontational and more practical approach has made the situation quite volatile. However this apparent disunity among the political leadership of Catalonia has resulted in a gradual reduction of public support for the independence movement of Catalonia.

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