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 5:04 PM

Yemen's Multilayered War: Al Qaeda in Arab Peninsula

This is the 4th part of a short explainer article series on the current crisis in Yemen. To read the earlier parts of the series click on the following links.

To read the 1st part of the series click on the link.

To read the 2nd part of the series click on the link.

To read the 3rd part of the series click on the link.

The unification of Yemen in 1990 was a direct result of the military defeat of South Yemen at the hand of North Yemen forces. This military defeat and coerced unification implied that Unified Yemen could not achieve real cohesion, preventing the functioning of the nation as a democratic unit.

Meanwhile, newer elements were added to the dangerous mix of sub-nationalism, intra religious division, and tribal loyalty in Yemen. These were the Yemeni veterans of Soviet-Afghan war who fought with the Afghan mujahideen against the Soviet army backing the Afghan government.

These were hardline Wahabi and Salafi fighters, following an idealogy that mandated a strict interpretation of Islam. The fighters returned to Yemen in the early 1990s, after the withdrawal of Soviet forces from Afghanistan. The local Yemeni, both the Zaidi Shias or Maliki Sunni have traditionally followed a more liberal version of Islamic and social practices. Unlike the local Sunnis who were living in peaceful coexistence with the Zaidis Shia, these hardliners were antagonistic to the Shias.

Their arrival was followed by a forceful realignment of the local residents’ religious practices, mandating the local population to strict interpretations and social practices. Osama bin Laden, who had family roots in Yemen, was a conveniently placed ideological mentor. This led to a pushback from both the government forces as well as Shia groups, especially the Houthi-led Ansar Allah movement. In time, these former mujahideen, who were battle hardened and well versed in guerilla warfare, allied themselves with Al-Qaeda to start a low level insurgency in Yemen.

The Gulf war and subsequent stationing of American forces in Saudi Arabia and other gulf countries provided another impetus for the growth of Al Qaeda in Yemen. Consequently, they demanded that coalition forces leave Arabian land, failing which would result in more terror attacks.

Al-Qaeda affiliated groups attacked many installations associated with the US-led coalition forces in Yemen and nearby countries. The most successful of those was the famous bombing of USS Cole in Aden, in 2000. It was followed by a series of attacks leading up to  9/11.

Al-Qaeda in the Arab Peninsula (AQAP) is also known as the Ansar al-Sharia in Yemen is fighting to set up an emirate amidst the lack of leadership post the Houthi rebellion. It was this outfit that claimed responsibility for the attack on the French satirical magazine, Charlie Hebdo, in 2015 and is now considered the most dangerous al-Qaeda outfit by the US.

The CNN reported that “AQAP set out its objectives in a May 2010 statement as the "expulsion of Jews and crusaders" from the Arabian Peninsula, the re-establishment of the Islamic caliphate, the introduction of Sharia, or Islamic law, and the liberation of Muslim lands.”

The full list of attacks and places captured by terrorist insurgents in chronological order can be accessed here.

One of the outcomes of continual terrorist attacks has been a reduction in Hadi’s popularity. He is also seen as weak for not being able to stop al-Qaeda from terrorising Southern Yemen, as well as for not being able to alleviate them from their feeling of marginalization ever since the unification.

To read the 5th part of the series click on the link.

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