India-based neutrino oblivion

In a conversation with science journalist Nandita Jayaraj, physicist and Nobel laureate Takaaki Kajita touched on the dismal anti-parallels between the India-based Neutrino Observatory (INO) and the Japanese Kamioka and Super-Kamiokande observatories. The INO’s story should be familiar to readers of this blog: a team of physicists led by those from IMSc Chennai and TIFR Mumbai conceived of the INO, identified places around India where it could be built, finalised a spot in Theni (in Tamil Nadu), and received Rs 1,350 crore from the Union government for it, only for the project to not progress a significant distance past this point.

Nandita’s article, published in The Hindu on July 14, touches on two reasons the project was stalled: “adverse environmental impacts” and “the fear of radioactivity”. These were certainly important reasons but they’re also symptoms of two deeper causes: distrust of the Department of Atomic Energy (DAE) and some naïvety on the scientists’ part. The article mentions the “adverse environmental impacts” only once while “the fear of radioactivity” receives a longer rebuttal — which is understandable because the former has a longer history and there’s a word limit. It bears repeating, however.

Even before work on the INO neared its beginning, people on the ground in the area were tense over the newly erected PUSHEP hydroelectric project. Environmental activists were on edge because the project was happening under the aegis of the DAE, a department notorious for its opacity and heavy-handed response to opposition. The INO collaboration compounded the distrust when hearings over a writ petition Marumalarchi Dravida Munnetra Kazhagam chief Vaiko filed in the Madras high court revealed the final ecological assessment report of the project had been prepared by the Salim Ali Centre for Ornithology and Natural History (SACON), which as the law required at the time hadn’t been accredited by the Quality Council of India and was thus unfit to draft the report. Members of the INO collaboration said this shouldn’t matter because they had submitted the report themselves together with a ‘detailed project report’ prepared by TANGEDCO and a geotechnical report by the Geological Survey of India. Perhaps the scientists thought SACON was good enough, and it may well have been, but it’s not clear how submitting the report themselves should have warranted a break from the law. Given all the other roadblocks in the project’s way, this trip-up in hindsight seems to have been a major turning point.

Locals in the area around the hill, under which the INO was to be built, were also nervous about losing access to part of their grazing land and to a temple situated nearby. There was a report in 2015 that police personnel had blocked people from celebrating a festival at this temple. In an April 2015 interview with Frontline, when told that local police were also keeping herders from accessing pastureland in the foothills, INO spokesperson Naba Mondal said: “The only land belonging to INO is the 26.825 ha. INO has no interest in and no desire to block the grazing lands outside this area. In fact, these issues were discussed in great detail in a public meeting held in July 2010, clearly telling the local people this. This is recorded in our FAQ. This was also conveyed to them in Tamil.” In response to a subsequent question about “propaganda” that the project site would store nuclear waste from Tamil Nadu’s two nuclear power facilities, Mondal said: “The DAE has already issued a press statement in this regard. I do genuinely believe that this has allayed people’s concerns.”

Even at the time these replies hinted at a naïve belief that these measures would suffice to allay fears in the area about the project. There is a difference between scientists providing assurances that the police will behave and the police actually behaving, especially if the experience of the locals diverges from what members of the INO collaboration believe is the case. Members of the collaboration had promised the locals they wouldn’t lose access to grazing land; four years later, the locals still had trouble taking their word. According to an investigation I published at The Wire in 2016, there was also to be a road that bypassed the local villages and led straight to the project site, sparing villagers the noise from the trucks ferrying construction material. It was never built.

One narrative arising from within the scientific community as the project neared the start of construction was that the INO is good for the country, that it will improve our scientific literacy, keep bright minds from leaving to work on similar projects abroad, and help Indians win prestigious prizes. For the national scientific enterprise itself, the INO would make India a site of experimental physics of global importance and Indian scientists working on it major contributors to the study of neutrino physics. I wrote an article to this effect in The Hindu in 2016 and this is also what Takaaki Kajita said in Nandita’s article. But later that year, I also asked an environmental activist (and a mentor of sorts) what he was thinking. He said the scientists will eventually get what they want but that they, the activists et al., still had to do the responsible thing and protest what they perceived to be missteps. (Most scientists in India don’t get what they want but many do, most recently like the ‘Challakere Science City’.)

Curiously, both these narratives — the activist’s pessimism and the scientists’ naïvety — could have emerged from a common belief: that the INO was preordained, that its construction was fated to be successful, causing one faction to be fastidious and the other to become complacent. Of course it’s too simplistic to be able to explain everything that went wrong, yet it’s also of a piece with the fact that the INO was doomed as much by circumstance as by historical baggage. That work on the INO was stalled by an opposition campaign that included fear-mongering pseudoscience and misinformation is disagreeable. But we also need to ask whether some actors resorted to these courses of action because others had been denied them, in the past if not in the immediate present — or potentially risk the prospects of a different science experiment in future.

Physics is often far removed from the precepts of behavioural science and social justice but public healthcare is closer. There is an important parallel between the scientists’ attempts to garner public support for the project and ASHA workers’ efforts during the COVID-19 pandemic to vaccinate people in remote rural areas. These latter people were distrustful of the public healthcare system: it had neglected them for several years but then it was suddenly on their doorstep, expecting them to take a supposedly miraculous drug that would cut their chances of dying of the viral disease. ASHA workers changed these people’s minds by visiting them again and again, going door to door, and enrolling members of the same community to convince people they were safe. Their efficacy is higher if they are from the same community themselves because they can strike up conversations with people that draw on shared experiences. Compare this with the INO collaboration’s belief that a press release from the DAE had changed people’s minds about the project.

Today the INO stares at a bleak future rendered more uncertain by a near-complete lack of political support.

This post benefited from Thomas Manuel’s feedback.

Physics Nobel rewards neutrino work, but has sting in the tail for India

As neutrino astronomy comes of age, the Nobel Foundation has decided to award Takaaki Kajita and Arthur B. McDonald with the physics prize for 2015 for their discovery of neutrino oscillations – a property which indicates that the fundamental particle has mass.

Takaaki Kajita is affiliated with the Super-Kamiokande neutrino detector in Japan. He and Yoji Totsuka used the detector to report in 1998 that neutrinos produced when cosmic rays struck Earth’s atmosphere were ‘disappearing’ as they travelled to the detector. Then, in 2002, McDonald of the Sudbury Neutrino Observatory in Canada reported that incoming electron neutrinos from the Sun were metamorphosing into muon- or tau-neutrinos. Electron-neutrino, muon-neutrino and tau-neutrino are three kinds of neutrinos (named for particles they are associated with: electrons, muons and taus).

What McDonald, Kajita and Totsuka had together found was that neutrinos were changing from one kind to another as they travelled – a property called neutrino oscillations – which is definite proof that the particles have mass. Sadly, Totsuka died in 2009, and may not have been considered for the Nobel Prize for that reason.

This was an important discovery for astroparticle physics. For one, the Standard Model group of equations that defines the behaviour of fundamental particles hadn’t anticipated it. For another, the discovery also made neutrinos a viable candidate for dark matter, which we’re yet to discover, and for what their having mass implies about the explosive deaths of stars – a process that spews copious amounts of neutrinos.

Neutrino oscillations were first predicted by the Italian nuclear physicist Bruno Pontecorvo in 1957. In fact, Pontecorvo has laid the foundation of a lot of concepts in neutrino physics whose development has won other physicists the Nobel Prize (in 1988, 1995 and 2002), though he’s never won the prize himself.

An infographic showing how the Super-Kamiokande neutrino experiment works. Source: nobelprize.org
An infographic showing how the Super-Kamiokande neutrino experiment works. Source: nobelprize.org

Although it was a tremendous discovery that neutrinos have mass, a discovery that forced an entrenched theory of physics to change itself, the questions that Pontecorvo, Kajita, McDonald and others asked have yet to be fully answered: one of the biggest unsolved problems in physics today is what the neutrino-mass hierarchy is. In other words, physicists haven’t yet been able to find out – via theory or experiment – which of the three kinds neutrinos is the heaviest and which the lightest. The implications of the mass-ordering are important for physicists to understand certain fundamental predictions of the Standard Model. As it turns out, the model has many unanswered questions, and some physicists hope that a part of the answer may lie in the unexpected properties of neutrinos.

An infographic showing how the Sudbury Neutrino Observatory works. Source: nobelprize.org
An infographic showing how the Sudbury Neutrino Observatory works. Source: nobelprize.org

Exacerbating the scientific frustration is the fact that neutrinos are notoriously hard to detect because they rarely interact with matter. For example, the IceCUBE neutrino observatory operated by the University of Wisconsin-Madison near the South Pole in Antarctica employs thousands of sensors buried under the ice. When a neutrino strikes a water molecule in the ice, the reaction produces a charged lepton – electron, muon or tau, depending on the neutrino. That lepton moves faster through the surrounding ice than the speed of light in ice, releasing energy called Cherenkov radiation that’s then detected by the sensors. Building on similarly advanced principles of detection, India and China are also constructing neutrino detectors.

At least, India is supposed to be. China on the other hand has been labouring away for about a year now in building the Jiangmen Underground Neutrino Observatory (JUNO). India’s efforts with the India-based Neutrino Observatory (INO) in Theni, Tamil Nadu have, on the other hand, ground to a halt. The working principles behind both INO and JUNO are targeted at answering the mass-ordering questions. And if answered, it would almost definitely warrant a Nobel Prize in the future.

INO’s construction has been delayed because of a combination of festering reasons with no end in sight. The observatory’s detector is a 50,000-ton instrument called the iron calorimeter that is to be buried underneath a kilometre of rock so as to filter all particles but neutrinos out. To acquire such a natural shield, the principal institutions involved in its construction – the Department of Atomic Energy (DAE) and the Institute of Mathematical Sciences, Chennai (Matscience) – have planned to hollow out a hill and situate the INO in the resulting ‘cave’. But despite clearances acquired from various pollution control boards as well as from the people living in the area, the collaboration has faced repeated resistance from environmental activists as well as politicians who, members of the collaboration allege, are only involved for securing political mileage.

Schematic view of the Underground neutrino lab under a mountain. Credit: ino.tifr.res.in
Schematic view of the Underground neutrino lab under a mountain. Credit: ino.tifr.res.in

The DAE, which obtained approval for the project from the Cabinet and the funds to build the observatory, has also been taking a hands-off approach and has until now not participated in resolving the face-off between the scientists and the activists.

At the moment, the construction has been halted by a stay issued by the Madurai Bench of the Madras High Court following a petition filed with the support of Vaiko, founder of the Marugmalarchi Dravida Munnetra Kazhagam. But irrespective of which way the court’s decision goes, members of the collaboration at Matscience say that arguments with certain activists have degenerated of late, eroding their collective spirit to persevere with the observatory – even as environmentalists continue to remain suspicious of the DAE. This is quite an unfortunate situation for a country whose association with neutrinos dates back to the 1960s.

At that time, a neutrino observatory located at a mine in the Kolar Gold Fields was among the first in the world to detect muon neutrinos in Earth’s atmosphere – the same particles whose disappearance Takaaki Kajita was able to record to secure his Nobel Prize for. Incidentally, a Japanese physicist named Masatoshi Koshiba was spurred by the KGF discovery to build a larger neutrino detector in his country, called Kamioka-NDE, later colloquialised to Kamiokande (Koshiba won the Nobel Prize in 2002 for discovering the opportunities of neutrino astronomy). Kamiokande was later succeeded by Super-Kamiokande, which in the late-1990s became the site of Kajita’s discovery. The KGF observatory, on the other hand, was shut in the 1992 as the mines were closed.

For the broader physics community, brakes applied on the INO’s progress count for little because there are other neutrino detectors around the world – like JUNO – as well as research labs that can continue to look for answers to the mass-ordering question. In fact, the Nobel Prize awarded to Kajita and McDonald stands testimony to the growing realisation that, like the particles of light, neutrinos can also be used to reveal the secrets of the cosmos. However, for the Indian community, which has its share of talented theoretical physicists, the slowdown signifies a slipping opportunity to get back in the game.

The Wire
October 6, 2015

Vaiko has a problem with the unmanned, fully automated neutrino observatory

Imagine a vast research facility situated below a hill – fully underground – hosting a massive particle detector made up of the world’s largest electromagnet and some 30,000 metal plates. Embracing this device is a magnetic field 35,000 times as strong as Earth’s, not to mention more than three million electronic channels carrying signals to and from computers monitoring the device. The facility will also house multiple other systems to process and analyze the measurements the detector will take (of neutrinos), and to support other particles physics experiments, including one to find signs of dark matter in the universe. The entire thing will cost Rs 1,500 crore and take six years to build.

Its most distinctive attribute? The entire thing is one big robot, completely unmanned with everything automated. The machine’s surfaces are all self-cleaning; the computers will power themselves on and off – as well as manage the particle detector – according to programs that have already been fed to them; the electromagnet will maintain itself. When important observations are made, the computers will process the data; write out the papers (with a little humor to taste); submit them to whatever journals (and upload a copy in the national OA repository); share the data with collaborating institutions; have the results corroborated by independent research teams; move on to the next experiment. All this guzzling power from the grid and promising nothing in return forever.

At least, this is Tamil Nadu politician Vaiko’s vision of the India-based Neutrino Observatory. After the INO received approval from the Prime Minister’s Office on January 5, Vaiko told the press on January 6:

… the neutrino project is not an industry, which would generate employment to the people in that area, but an institution to carry out research only.

 

His bigger point was that the INO should be scrapped because it would affect the environment in the area it’s coming up in: the West Bodi Hills, Theni district. The observatory requires a substantial shield to keep out all particles but neutrinos from the detector, and achieving this is easier under more than a mile’s worth of rock.

That said, Vaiko should acquaint himself with what happened in the months leading up to the approval. The scientists from the Institute of Mathematical Sciences, Chennai, and Tata Institute of Fundamental Research, Mumbai, spent time among the people living around the hill, addressing their questions – from where debris from the construction of the underground cavern would be dumped to where the scientists’ facilities would get their water from to what kind of experiments would be conducted at the INO.

In fact, in 2009, the national UPA government had refused to allow the INO to set up shop in Nilgiris district – the first finalized location – over environmental concerns, and suggested the present location near the Suruliyar Falls. In 2012, members of the collaboration from IMSc told me that the roads leading to and from the two entrances to the cavern would not be laid in straight lines through the surrounding forests en route to Madurai (110 km away) but only through the least densely populated areas – both by people and animals. They also told me that the land acquired for the project was not agricultural land (and it had been acquired before the land acquisition laws were diluted).

Beyond this point, I have only one suggestion for Vaiko: How about calling for scrapping the INO before its Cabinet clearance comes through? But on the upside, I am glad he’s not on the same page as VS Achuthanandan. Or as VT Padmanabhan.

An elusive detector for an elusive particle

(This article originally appeared in The Hindu on March 31, 2014.)

In the late 1990s, a group of Indian physicists pitched the idea of building a neutrino observatory in the country. The product of that vision is the India-based Neutrino Observatory (INO) slated to come up near Theni district in Tamil Nadu, by 2020. According to the 12th Five Year Plan report released in October 2011, it will be built at a cost of Rs.1,323.77 crore, borne by the Departments of Atomic Energy (DAE) and Science & Technology (DST).

By 2012, these government agencies, with the help of 26 participating institutions, were able to obtain environmental clearance, and approvals from the Planning Commission and the Atomic Energy Commission. Any substantial flow of capital will happen only with Cabinet approval, which has still not been given after more than a year.

If this delay persists, the Indian scientific community will face greater difficulty in securing future projects involving foreign collaborators because we can’t deliver on time. Worse still, bright Indian minds that have ideas to test will prioritise foreign research labs over local facilities.

‘Big science’ is international

This month, the delay acquired greater urgency. On March 24, the Institute of High Energy Physics, Beijing, announced that it was starting construction on China’s second major neutrino research laboratory — the Jiangmen Underground Neutrino Observatory (JUNO), to be completed at a cost of $350 million (Rs. 2,100 crore) by 2020.

Apart from the dates of completion, what Indian physicists find more troubling is that, once ready, both INO and JUNO will pursue a common goal in fundamental physics. Should China face fewer roadblocks than India does, our neighbour could even beat us to some seminal discovery. This is not a jingoistic concern for a number of reasons.

All “big science” conducted today is international in nature. The world’s largest scientific experiments involve participants from scores of institutions around the world and hundreds of scientists and engineers. In this paradigm, it is important for countries to demonstrate to potential investors that they’re capable of delivering good results on time and sustainably. The same paradigm also allows investing institutions to choose whom to support.

India is a country with prior experience in experimental neutrino physics. Neutrinos are extremely elusive fundamental particles whose many unmeasured properties hold clues about why the universe is the way it is.

In the 1960s, a neutrino observatory located at the Kolar Gold Fields in Karnataka became one of the world’s first experiments to observe neutrinos in the Earth’s atmosphere, produced as a by-product of cosmic rays colliding with its upper strata. However, the laboratory was shut in the 1990s because the mines were being closed.

However, Japanese physicist Masatoshi Koshiba and collaborators built on this observation with a larger neutrino detector in Japan, and went on to make a discovery that (jointly) won him the Nobel Prize for Physics in 2002. If Indian physicists had been able to keep the Kolar mines open, by now we could have been on par with Japan, which hosts the world-renowned Super-Kamiokande neutrino observatory involving more than 900 engineers.

Importance of time, credibility

In 1998, physicists from the Institute of Mathematical Sciences (IMSc), Chennai, were examining a mathematical parameter of neutrinos called theta-13. As far as we know, neutrinos come in three types, and spontaneously switch from one type to another (Koshiba’s discovery).

The frequency with which they engage in this process is influenced by their masses and sources, and theta-13 is an angle that determines the nature of this connection. The IMSc team calculated that it could at most measure 12°. In 2012, the Daya Bay neutrino experiment in China found that it was 8-9°, reaffirming the IMSc results and drawing attention from physicists because the value is particularly high. In fact, INO will leverage this “largeness” to investigate the masses of the three types of neutrinos relative to each other.

So, while the Indian scientific community is ready to work with an indigenously designed detector, the delay of a go-ahead from the Cabinet becomes demoralising because we automatically lose time and access to resources from potential investors.

“This is why we’re calling it an India-based observatory, not an Indian observatory, because we seek foreign collaborators in terms of investment and expertise,” says G. Rajasekaran, former joint director of IMSc, who is involved in the INO project.

On the other hand, China appears to have been both prescient and focussed on its goals. It purchased companies manufacturing the necessary components in the last five years, developed the detector technology in the last 24 months, and was confident enough to announce completion in barely six years. Thanks to its Daya Bay experiment holding it in good stead, JUNO is poised to be an international collaboration, too. Institutions from France, Germany, Italy, the U.S. and Russia have evinced interest in it.

Beyond money, there is also a question of credibility. Once Cabinet approval for INO comes through, it is estimated that digging the vast underground cavern to contain the principal neutrino detector will take five years, and the assembly of components, another year more. We ought to start now to be ready in 2020.

Because neutrinos are such elusive particles, any experiments on them will yield correspondingly “unsure” results that will necessitate corroboration by other experiments. In this context, JUNO and INO could complement each other. Similarly, if INO is delayed, JUNO is going to look for confirmation from experiments in Japan, South Korea and the U.S.

It is notable that the INO laboratory’s design permits it to also host a dark-matter decay experiment, in essence accommodating areas of research that are demanding great attention today. But if what can only be called an undue delay on the government’s part continues, we will again miss the bus.

“God is a mathematician.”

The more advanced the topics I deal with in physics, the more stark I observe the divergence from philosophy and mathematics to be. While one seems to drill right down to the bedrock of all things existential, the other assumes disturbingly abstract overtones, often requiring multiple interpretations to seem to possess any semblance of meaningfulness.

This is where the strength of the mind is tested: an ability to make sense of fundamental concepts in various contexts and to recall all of them at will so that complex associations don’t remain complex but instead break down under the gaze of the mind’s eye to numerous simple associations.

While computation theory would have us hold that a reasonable strength of any computing mechanism could be measured as the number of calculations it can perform per second, when it comes to high-energy physics, the strength lies with the quickness with which new associations are established where old ones existed. In other words, where unlearning is just as important as learning, we require adaptation and readjustment more than faster calculation.

In fact, the mathematics is such: at the fringe, unstable, flitting between virtuality and a reality that may or may not be this one.

One could contend that the definition of mathematics in its simplest form – number theory, fundamental theories of algebra, etc. – is antithetic to the kind of universe we seem to be unraveling. If we considered the example of physics, and the divergence of philosophy from theoretical physics, then my argument is unfortunately true.

However, at the same time, it seems to be outside the reach of human intelligence to conceive a new mathematical system that becomes simpler as we move closer to the truth and is ridiculously more complex as one strays from it toward simpler logic – not to mention outside the reach of reasoning! How would we then educate our children?

However, it is still unfortunate that only “greater” minds can comprehend the nature of the truth – what it comprises, what it necessitates, what it subsumes.

With this in mind: we also face the risk of submitting to broader and broader terms of explanation to make it simpler and simpler; we throw away important aspects of the nature of reality from our textbooks because people may not understand it, or may be disturbed by such clarity, and somehow result in the search seeming less relevant to daily life. Such an outcome we must keep from being precipitated by any activity in the name of and for the sake of science.

On Monday, I attended a short lecture by the eminent Indian particle physicist Dr. G. Rajasekaran, or Rajaji as he is referred to by his colleagues, on the Standard Model of high-energy physics and its future in the context of the CERN announcement on July 4, 2012. While his talk itself straightened a few important creases in my superficial understanding of the subject, two of its sections continues to nag at me.

The first was his attitude toward string theory, which was laudatory to say the least and stifling to say the most. When asked by a colleague of his from the Institute of Mathematical Science about constraints placed on string theory by theoretical physics, Rajaji dismissed it as a political “move” to discredit something as exotic as the mathematical framework that string theory introduced.

After a few short, stunted sniggers rippled through the audience, there was silence as everyone realised Rajaji was serious in his allegation: he had dismissed the question as some political comment! Upon some prodding by the questioner, Rajaji proceeded to answer in deliberately uncertain terms about the reasons for the supertheory’s existence and its hypotheses.

Now, I must mention that earlier in his lecture, he had mentioned that researchers, especially of high-energy/particle physics, tended to dismiss new findings just as quickly as they were ready to defend their own propositions because the subject they worked with was such: a faceless foe, constantly shifting form, one moment yielding to one whim, one serendipity, and the next moment, to the other (ref: Kuhn’s thesis). And here he was, living his words!

The second section was his conviction that the future of all kinds of physics lay in the hands of accelerator physics. That experimental proof was the sole arbiter for all things physical he summarised within a memorable statement:

God is a mathematician, but even he/she/it will wait for experimental proof before being right.

This observation arose when Rajaji decided to speculate aloud on the future of experimental particle physics, specially considering an observable proof of the existence of string theory.

He finished ruing that accelerator physics was an oft ignored subject in many research centres and universities; now that we had sufficiently explored the limits and capabilities of SM-physics, the physics to follow (SUSY, GUT, string theory, etc.) necessitated collision-energies of the order of 1019 GeV (the “upgraded” run of the LHC in early to July 2012 delivered a collision energy of 8,000 GeV).

These are energies well outside the ambit of current human capability. It may well be admitted at this point that an ultimate explanation of the universe and all it contains is not going to be simple, and definitely not elegant. Every step of the way, we seem to encounter two kinds of problems: one cardinal (particle-kinds and their properties) and metaphysical (why three families of particles and not two or four?).

While the mathematics is “reconfigured” to include such new findings, the philosophy acquires a rupture, a break in derivability, and implications become apparent ex post facto.

So, is it going to be good news tomorrow?

As the much-anticipated lead-up to the CERN announcement on Wednesday unfolds, the scientific community is rife with many speculations and few rumours. In spite of this deluge, it may be that we could expect a confirmation of the God particle’s existence in the seminar called by physicists working on the Large Hadron Collider (LHC).

The most prominent indication of good news is that five of the six physicists who theorized the Higgs mechanism in a seminal paper in 1964 have been invited to the meeting. The sixth physicist, Robert Brout, passed away in May 2011. Peter Higgs, the man for whom the mass-giving particle is named, has also agreed to attend.

The other indication is much more subtle but just as effective. Dr. Rahul Sinha, a professor of high-energy physics and a participant in the Japanese Belle collaboration, said, “Hints of the Higgs boson have already been spotted in the energy range in which LHC is looking. If it has to be ruled out, four-times as much statistical data should have been gathered to back it up, but this has not been done.”

The energy window which the LHC has been combing through was based on previous searches for the particle at the detector during 2010 and at the Fermilab’s Tevatron before that. While the CERN-based machine is looking for signs of two-photon decay of the notoriously unstable boson, the American legend looked for signs of the boson’s decay into two bottom quarks.

Last year, on December 13, CERN announced in a press conference that the particle had been glimpsed in the vicinity of 127 GeV (GeV, or giga-electron-volt, is used as a measure of particle energy and, by extension of the mass-energy equivalence, its mass).

However, scientists working on the ATLAS detector, which is heading the search, could establish only a statistical significance of 2.3 sigma then, or a 1-in-50 chance of error. To claim a discovery, a 5-sigma result is required, where the chances of errors are one in 3.5 million.

Scientists, including Dr. Sinha and his colleagues, are hoping for a 4-sigma result announcement on Wednesday. If they get it, the foundation stone will have been set for physicists to explore further into the nature of fundamental particles.

Dr. M.V.N. Murthy, who is currently conducting research in high-energy physics at the Institute of Mathematical Sciences (IMS), said, “Knowing the mass of the Higgs boson is the final step in cementing the Standard Model.” The model is a framework of all the fundamental particles and dictates their behaviour. “Once we know the mass of the particle, we can move on and explore the nature of New Physics. It is just around the corner,” he added.