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 4:36 PM

Story of Iyad Hallaq: What it tells about Palestinians under Israeli occupation

The death of Iyad Hallaq, an autistic Palestinian man, who was shot dead by two Israeli police officers sparked several unrests in Jerusalem. Iyad Hallaq of age 32 was walking to his school of special needs in the Old City of Jerusalem. According to the statement given by the police officers, Iyad was wearing gloves which made them suspect he possessed a weapon. Iyad, who was diagnosed with low functioning disorder, had limited communication skills. Due to this out of panic, he fled, and the police personnel started firing. He tried to hide behind a dumpster where he was shot dead. It is suspected that one of the police officers might have kept shooting despite receiving orders from his commander to halt.

Following this event, the family’s house was searched without any consent for possible weapons. Later on, the family requested a Palestinian representative to be present during Hallaq’s autopsy. The family alleges that this representative was denied entry. The police sealed off the Old City and reported that the Police Internal Investigations Department would be taking over the investigation of the case.

Mansour Abu Wardieh, the victim's cousin, said the family is not optimistic about the police investigation and fears that the police would end up twisting the facts. This lack of trust in the police authorities could be attributed to the fact that firstly the police have shown their disregard to the family by their actions mentioned above and secondly, in the last ten years Israeli security forces have killed more than 3,400 Palestinians but have only been convicted five times.

These numbers prove that Iyad’s killing is just the tip of the iceberg of the atrocities faced by Palestinians that live under the Israeli occupation. Iyad’s case has created a trigger for the Palestinian Arab minorities in Jerusalem to channel out their frustration. The killing has not only been condemned by Palestinians, but also by Jewish Israelis and international figures. The protests against police brutality after the killing of George Floyd have been gaining momentum and protests in Jerusalem began to draw parallels between these two cases. The protests in Jerusalem resounded with several slogans like ‘Palestinian Lives Matter’ alongside the ‘Black Lives Matter’ slogans.

Though the demonstrations united the Palestinian Arabs and Israeli Jews, it comes as little relief to the family and for Arab minorities. It was after more than a week that the Israeli Prime Minister Benjamin Netanyahu broke silence on this matter. Middle East Monitor reported the exact comments of the prime minister “What happened to Iyad Hallak is a tragedy. This was a man with disabilities, autism, who was suspected – and we (now) know wrongly – of being a terrorist in a very sensitive venue”. While the prime minister's comments fell short of an apology the Defence Minister Benny Gantz offered a public apology.

While the family and protestors remain un-optimistic about the justice being delivered insights shared by an Israeli Parliament member Ahmed Tibi, seem to shed some light on why Hallaq was killed. According to Tibi, Arabs and Palestinians were intentionally killed without any concrete reason, and for long this has been the policy of the Israeli forces. B’Tselem, a human rights organisation based in Israel said that most killings of Palestinians “were a direct outcome of Israel’s reckless open-fire policy, authorised by the government and military and backed by the [Israeli] legal system.”

The whole system in Israel seems to be designed to discriminate against its Arab minorities. Various senior political officials have openly spread hate against these minority communities. They have also encouraged their soldiers and police forces to kill Palestinians even if they have the slightest suspicion of them being a threat. It is a systematically built system that has subjected Palestinians to abuse and harsh punishments immemorial.

More than 150 instances were recorded between the span of October 2015 and January 2017 in which Israeli security forces have shot Palestinians under suspicion of carrying weapons. However, video footages or witness accounts have raised questions in many cases regarding the necessity of force. Repeatedly cornering these minorities have led to the death of 33 Israelis in the hands of Palestinian assailants in the same period. Hence this use of lethal force has had devastating effects on both the communities. Regulation of force by armed personnel and unbiased, neutral approach is required to curb down this violence. The authorities must also create rules that clearly define the boundaries for force used by armed personnel, and the state should actively denounce hate speech and illegal lethal force to avoid cases like that of Hallaq repeating.

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