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 4:46 PM

Electoral Processes in the US: Electing the President

The USA electoral process is a complex one; caucuses and primaries, followed by national conventions, general elections, formation of the electoral college and the selection of the president. Each step of this process has a lot of subtleties, which vary widely from state to state.

Caucuses and Primaries: This is the initial step of the selection of president. This stage of choosing occurs within a political party, where the party picks the candidate to rally behind.

In the state “Primary”', the registered members of political parties cast votes to allocate delegates for the presidential nominees of their parties. In some of the states this is done through caucuses, where groups are formed behind various potential candidates and there is discussion and persuasion between various groups. Republican party allocates all the delegates directly through primary or caucus, however the Democratic party allocates some Super-Delegates over and above the directly elected ones. These selected or allocated delegates are sent to the national party convention to represent their nominees.

In the process occurring between the primaries and caucuses to the selection of the potential electors is decided entirely by the party. The democrats, after the 1968 democratic convention, made a formal mechanism to reduce power of party leaders over the selection process and ways to represent minorities in the electors. This, however, backfired for the party as the delegates selected by primaries voted according to candidates and not the party, which led to the 1972 democratic Presidential candidate to win in only one state. The rules were then reformed and the concept of Super-Delegates was introduced. The Republican party also followed a somewhat similar trajectory, but did not impose as many restrictions on the delegate selection process, and never took measures to include the minorities.

National Conventions: Each parties’ delegates then choose a final presidential nominee at a national party convention. The nominee picks another person, who would be the vice president in the case the nominee wins. Here, there can be pledged or unpledged delegates; pledged ones are bound to support the potential candidates they chose in the previous round, while the unbound, or superdelegates can support anyone they choose.

Electoral College: After each of the parties have selected their presidential candidate, the candidate campaigns across the country to gain favor from the general public. There are speeches, rallies, debates, and other outreach activities, in which the candidates promote themselves. Meanwhile, the parties select some respective potential electors in each state, which are the people who get the last vote in the selection of the president. Each party forms a slate of potential electors according to the state..

General Election:After this, the general election occurs, in which the public votes for a president. However, the public does not directly vote for the president; they vote for the slate of electors for that political party for that state.

After the general election, the Electors are appointed to the state in two ways.. Electors from all the states then form the electoral college, which is the body that votes for the president. The electors are not legally bound to vote for the party they are pledged to, but can be fined or disqualified if they defect. Throughout USA history, though, more than 99% of the electors have voted as pledged.

The electoral college presently has 538 electors and the candidate who wins 270 or more electoral votes, wins the Presidential election.

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