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 4:55 PM

Suppressing the Minority Voting: An effective discrimination tactic of the US Conservatives

The recent protests over George Floyd’s death and reactions of the conservatives against the protest laid bare the systemic injustice and oppression faced by the people of color in the USA.

The other, albeit invisible form of discrimination perpetuated by the conservative political establishment in the USA is “Minority Voter Suppression”.

Though it may seem improbable that long after the Jim Crow laws are junked and Civil Right Laws are in place, the effort to disenfranchise the Black people is still going on.

The major piece of legislation which protected minorities from electoral exploitation was the Voter Registration Act which underpins the basic ideal of a universal adult franchise by specifically addressing and combating voting discrimination.

To ensure the representation to minority communities, this act mandated that “At-Large Elections”, where the whole of the jurisdiction elects all of the city council, were replaced by the single member districts in which each community selects a person to represent them in the city council.

It was also prohibited to draw the voting district in such a way that  minorities could be clubbed in only a few of the districts. It was also made mandatory for those states which have a history of discrimination to get pre-clearance from the justice department before changing their voting laws.

This law, however, lost its power in a process which began in 1980. In 1980 the Supreme Court ruled that at-large elections were not unconstitutional, on their own. In 1995, the Court began restricting the construction of majority minority districts on grounds that it segregates people on the basis of race.

In 2008, the court ruled that a photo voter ID law in Indiana was constitutional and was in state interest to protect against voter fraud (research shows that photo voter IDs provide disincentive to vote for people of color). The voter ID law requires the voters to have a government-issued photo ID to cast a ballot.

In 2013, the Supreme Court scrapped the part of the law which stated that some states (which had an alleged history of discrimination) needed federal preclearance in any changes of their voting laws, meaning that the state laws would need approval from the federal government before being put into practice. This was done so citing that the methods which determined discriminatory states were invalid.

All of these slowly chipped away at the laws, and especially the 2013 Shelby County vs Holder case which led to a host of issues whVoter Suppression is Still One of the Greatest Obstacles to a More Just Americaich directly/indirectly keep a significant proportion of minorities from voting. Few of such actions are closure or relocation of precincts in majority black areas, purge of minority voters from the voter lists, and elimination of Sunday early voting days which are preferred by black voters.

There have been attempts to restrict registration drives in Tennessee on the basis that many of the forms were incomplete.

There have also been laws enacted which needed people to participate regularly in elections to keep their voting rights and reply to a letter sent to their residence, which makes it difficult for Black and Hispanics due to obscure areas and the fact that they’re half as likely than other people to get a day off work to vote.

The governor of Georgia, Brian Kemp, has been accused of using intimidation tactics to scare minority communities.

In Texas, the acting secretary of state said that he had a list of 95,000 non-citizens who were registered for voting in the state, and 58,000 of them had already cast a vote. That claim was proven untrue when it was noted that there were tens of thousands of people who were naturalized citizens.

In many states, felons are not allowed to vote even after they have served their sentence, and in Florida felons are allowed to vote only if they have paid an array of fees after serving their sentence, which sets an economic bar on their ability to vote.

This is evident that forces working against the equal rights for the minority communities are still working at full force to reverse the gains of civil right movements. The fight for the unhindered voting rights for the minority communities in the USA at the social, political, and judicial front will continue in the foreseeable future.

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