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

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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 4:54 PM

A Timeline of Political Instability in the Indian state of Rajasthan

A recent political crisis in the Indian state of Rajasthan has brought with it a storm of internal instability. Perhaps the biggest question on the mind of most political analysts and politicians, amidst this, is the anticipation—or hope— that Sachin Pilot, ex-Deputy Chief Minister of Chief Minister in Rajasthan, will announce his departure from the Indian National Congress (INC) and join the Bharatiya Janata Party (BJP). The central BJP government has garnered quite a reputation for toppling state governments in regions where the oppositional party Congress forms the majority.

But focusing on the BJP might be taking everyone’s eyes away from the big picture: a story that is, for now, about more than possible BJP interference. Consider what the crisis tells the citizens of India about Congress’ national and state level handling of ‘political drama,’ as the series of events continue to unfold.

July 10, 2020: Pilot is summoned by the Special Operations Group (SOG) of the Rajasthan Police in regards to an FIR registered against him on an alleged attempt to dislodge the Gehlot government in recent Rajya Sabha polls through horse-trading; however, the root of discord may have been sown long before that.

July 11, 2020: The Chief Minister (CM), Ashok Gehlot claims the BJP is trying to overturn his government by bribing MLAs.

July 12, 2020: The Dy Chief Minister, Sachin Pilot claims 30 MLAs have ‘pledged support’ to him, making the present government a minority. Ashok Gehlot responds by claiming it has 109 MLAs; Pilot seen with BJP leader Jyotiraditya Scindia in Delhi as he and his supporters move in and around Delhi and Gurgaon.

July 13, 2020: INC issues whip for Congress Legislature Party (CLP) meeting at CM’s residence where it passes a resolution to support Gehlot and take disciplinary action against MLAs and office-bearers who ‘weakens party’; Congress also says that ‘doors will remain open’ for Pilot and his aides; Pilot does not attend the meeting, and those who do are transported to Fairmont Hotel in Jaipur to avoid any ‘potential crossover.’

July 14, 2020: INC calls for a second CLP meet, which is once again not attended by Pilot; Pilot is removed from his positions as the Deputy Chief Minister and President of State Congress Committee of Rajasthan, along with 18 other MLAs who supported him; a plea is filed in Rajasthan High Court against the disqualification notices; 2 MLAs from Bhartiya Tribal Party (BTP) withdraw support from Congress, but hand over letters of support to Ghelot four days later on July 18; the BJP demands a floor test, but later denies this claim.

July 15, 2020: Pilot confirms he is not planning to join the BJP.

July 16: News of leaked audio tapes start surfacing, reportedly proving a conspiracy to topple the Gehlot government; FIRs are lodged.

July 17, 2020: Harish Salve, representative of ‘Pilot camp’ in Rajasthan HC, argues that the rebel MLAs have not resigned, yet they were issued disqualification notices under Paragraph 2(1)(a) of the Tenth Schedule, which is only applicable in case of resignation; 2 rebel MLAs are suspended by Congress over their alleged involvement in leaked audio tapes; an arrest is made by SOG in regards to horse-trading probe and leaked audio tapes.

July 18, 2020: BJP levels allegations of phone tapping and demands Central Bureau of Investigation (CBI) probe in relation to leaked audio tapes; two days later the Rajasthan Government notifies via circular that it has revoked general consent to CBI that is needed for investigations, and consent will now be sought on a case by case basis.

July 19, 2020: SOG reaches Manesar to question one of the rebel MLAs claimed to be named in leaked audio tapes; Gehlot forms probe to investigate audio tapes.

July 20, 2020: Giriraj Singh Malinga, a Rajasthan MLA from INC, claims that he was offered Rs. 35 crore by Pilot to join the BJP, Pilot responds by saying he is ‘sad but not surprised’ at what he considers to be fabrications intended to damage his reputation; Ghelot remains convinced that Pilot is ‘hand in glove’ with the BJP; meanwhile in Rajasthan High Court, the judges observe that a whip cannot be issued with respect to a party meeting, but only for an Assembly session.

July 21, 2020: Hearing of petition ends, Rajasthan High Court says it will announce the verdict on July 24 and the Speaker cannot act on the disqualification notices until then; Third Congress Legislature Party begins at Fairmont Hotel.

July 22, 2020: Rajasthan Speaker CP Joshi moves Supreme Court in order to challenge the stay order of the High Court.

July 23, 2020: SC allows Rajasthan HC to continue passing orders as scheduled; says it will begin hearing the Speaker’s plea from July 27.

July 24, 2020: Rajasthan HC orders that a “status quo” be maintained and defers its judgement until SC makes a decision; Speaker will not be allowed to act on disqualification notice until both courts pronounce their verdicts; Rajasthan HC allows the Union of India to be made a party in the case; ‘Gehlot’s camp’ organise a dharna at Raj Bhawan demanding an Assembly session, and Gehlot meets Governor Kalraj Mishra regarding the same.

As the situation gets more complex and drawn-out, the question of the BJP government’s involvement is still up in the air. The crisis currently presents itself as a mishandling on Congress' part at the state and national level, perhaps stemming from younger leaders not seeing eye-to-eye with the veterans.

The insatiable hunger for power by any means displayed by the BJP- despite its claims of non-involvement- in seeing the current government toppled cannot and should not be overlooked. Speculations run abound, and at the end of the day it might just be up to the citizens to peer through the fog and infer for themselves the roles and intentions of the embroiled parties.

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