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 5:06 PM

Civilian Trials In Military Courts in Al Sisi’s Egypt

With President Abdel Fattah al-Sisi in power, Egypt is currently in the throes of a near-complete reversal of democracy. Under his rule the military has intruded into almost all aspects of public life, in a very explicit attempt to instill fear in Egyptians.

One of the most pervasive examples of this has been the military’s disruption of judicial process, with interference turning to encroachment as more and more civilians continue to be tried and sentenced by the army, through various nefarious means of expanded military jurisdiction.

Mohammad Morsi at XVI Non-Aligned Movement (NAM) Summit, in Tehran, Iran on August 30, 2012 | Source: Government of India via Wikimedia

While a military judiciary has been present in Egypt since the 1960s, their power continued to grow after then Defence Minister Sisi overthrew the democratically elected President, Mohammed Morsi in a coup and became Egypt’s new leader. Since then he has worked towards removing tenure limits to his term, virtually guaranteeing him power for another decade or more.

The Egyptian government, like many others across the globe, has used the pandemic and the limited mobility of citizens due to it to tighten their chokehold on dissent and opposition. In April 2020, the Egyptian Parliament passed amendments to its Emergency Law. The law already prohibited demonstrations and protests, and now allows the military to arrest and confiscate assets of citizens without requiring permission from the special prosecutor, and investigate civilians without the right to appear before a judge.

Egypt has seen more time under Emergency Law than not in the past few decades, and President Sisi has not strayed from this pattern. The law has been used in many ways to normalize the military trespassing into the civil judicial system, such as having military judges on civil judicial councils and declaring the military judiciary as “an independent judicial entity” no longer under the command of the armed forces.

Public facilities have been placed under military jurisdiction, in conjunction with a law that allows anyone who directly or indirectly “assaults” an army base to be tried in a military court. In these courts defendants do not have common legal rights such as being informed of their charges, access to a lawyer or being brought before a judge soon after arrest.

Late Shaby Habash, a young filmmaker who died in prison August 2020 | Source: Shaby Habash Facebook

Additionally, there have been multiple reports of torture, sexual assault while placed in detention. In prison too, detainees face inhumane conditions, not being allowed to see family, exercise or get sunshine and fresh air. Thousands of student protestors, journalists and political dissidents have been tried in these military courts, and hundreds more have been killed extrajudicially. At the same time, citizens’ tools to criticise these steps are undermined, such as by limiting the domain of NGOs, censoring news and social media, and blocking around 600 websites.

The arrest, incarnation and trial of the deposed President, Mohammed Morsi is a glaring example of what is wrong with Egypt’s military trials. Morsi, who was in jail for over 6 years since the coup in 2013 and was under trial in military court collapsed and died during a hearing in the military court itself.

The constitution, the parliament, the law, and the abuse of these pillars of democracy has been instrumental in Sisi being able to give the military and himself the extreme power that they now possess. But despite restrictions on assembling and protesting, Egyptians continue to make their voices heard in the streets and worldwide, hoping that where institutions betray them, their community won’t. Hoping against hope, hoping against tyranny.

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