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 5:09 PM

Beirut Port Blast: What lies ahead for Lebanon?

The year 2020 will be remembered as the year of disasters in the history of humankind. A devastating tragedy struck Beirut, the capital of Lebanon on August 4, 2020, in the form of a massive explosion which occurred in the port area and ripped a large part of the town .

As per initial estimate the death toll stands at 157 with more than 5000 people severely bruised and thousands displaced from their homes. The incredible force of the blast could be felt as far as Cyprus, which is at a distance of 250 kms from the explosion site.

A giant red cloud of smoke erupted in the clear skies followed by a deafening ‘bang’ and smashing of windows. "First we heard one sound. Seconds later there was a big explosion. All hell broke loose and I saw people thrown five or six metres" said Ibrahim Zoobi, who worked near the port. Satellite images show that warehouses and buildings within a radius of 2km from the site of the blast were completely destroyed, ending up in debris.

The intensity of the blast was equivalent to almost ‘2.2 kilotons of TNT’, according to an analyst and weapons expert. The aftermath included scenes of jam-packed hospitals, running without proper electricity connection, increased demand of blood donations and generators and agonized cries of people searching for their loved ones amongst the rubble filled roads.

Michel Aoun, the President of Lebanon | Source: Wikimedia

American President Donald Trump was quick to tweet about calling the blast a ‘terrible attack’. However, according to Michel Aoun, the President of Lebanon, the actual culprit of the blast was the 2,750 tonnes of fertilizer, ammonium nitrate, stored in one of the warehouses in the port area which caught fire. This explosive material was reportedly confiscated from a Russian cargo ship, back in 2014, when it made an uninformed stop at the Lebanese port.

Ammonium nitrate is a white substance used as a fertilizer as well as an explosive. It cannot explode on coming in contact with air but can detonate immediately as it encounters a flammable substance like oil or fire. Being an oxidiser, it will accelerate the severity of the explosion and also lead to release of toxic gases like nitrogen dioxide.

Boaz Hayoun, one of the top bomb experts of Israel, states “Before the big explosion, in the center of the fire, you can see sparks, you can hear sounds like popcorn and you can hear whistles”, which is a strong indication of fireworks. This might point towards seemingly inadequate warehouse management issues in Beirut, as such substances might have come across the explosive nitrates and instigated the blast. The safety protocols were simply not followed, despite being aware about the presence of a ‘ticking time bomb’ in the warehouse.

As Beirut is fighting the COVID-19 pandemic and a financial crisis, it was definitely not ready for another blow. Beirut’s grain storage tower, the largest in Lebanon, was also engulfed in the flames, hampering the entire country’s food security. "It's an economic crisis, a financial crisis, a political crisis, a health crisis, and now this horrible explosion” says Tamara Alrifai, spokesperson for the UN Relief and Works Agency for Palestine Refugees in the Near East (UNRWA).

France, the US, Italy, Turkey, Iran, EU, and OIC came up with the offer of help and show support for the people of Beirut.  Emmanuel Macron, the President of France, was the first foreign leader to visit the crisis-hit Beirut. While he consoled the citizens, their grief turned into anger as they chanted the word ‘Revolution’.

There is great anger among the citizens against the government, whom they accuse of being corrupt, sectarian, unaccountable, and out of touch with the common people. The intense protest by the people on the street forced the Prime Minister Hassan Diab to resign along with his cabinet on August 10, 2020.

The economic cost of the Beirut blast, where over 300,000 people have become homeless after their homes get destroyed, is estimated to be $15 Billion. Lebanon, which was already on the verge of economic collapse before this disaster struck, may find it impossible to withstand such a blow to the economy. It will need the support from the world over to rebuild Beirut.

A donor conference for rebuilding Beirut received a total pledge of about $300 million. Though it is a minuscule figure as compared to the destruction in Beirut, it will help to tide over the immediate humanitarian crisis. Apart from this Turkey has offered to help rebuild the port of Beirut and many countries are sending relief supplies.

The days ahead for the citizens of Beirut are going to be challenging as the country navigates the sectarian divide during the formation of a new government. It will be keenly watched by the citizens as well as the international community, whether Lebanon will discard its entrenched ruling elite and reject the toxic sectarian divide to elect an inclusive government or continue to perpetuate the misery on the common citizens.

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