Physicists have revealed that the unusual decay of an “exotic” subatomic particle could offer new clues to its mysterious structure.

The discovery, reported by a team of physicists in a study published in Physical Review Letters, argues that it provides the first “crucial discrimination” between current theoretical models of a variety of subatomic particles known as the Ds(2317) meson.

Exotic Subatomic Mysteries

The new research has its beginnings more than two decades ago, with the initial detection of an unusual particle known as the Ds(2317) meson. Part of what makes this particle unique is the fact that it possesses one charm quark (or “c quark,” a kind of elementary particle) and one strange antiquark—the third lightest of all the known quarks.

It was deemed a major discovery at the time, and for good reason: it seemed to point at a significant discrepancy between the particle’s measured mass of 2.317 GeV/c2, and predictions based on estimates that placed it significantly higher, at around 2.4 GeV/c2.

Now, in a new study by researchers with the Belle and Belle II Collaboration, observations of previously undetected behaviors that include never-before-seen light-emissions during the particle’s decay have been described for the first time.

Based on their analysis, the team believes their new findings mark not only a significant first in the study of these particles, but that they may also help researchers solve the longstanding mystery involving apparent discrepancies between the observed and expected mass values for the Ds(2317) meson.

The findings, the team says, could also provide physicists with deeper insights into the fundamental forces that currently bind matter.

Unraveling a Baffling Discrepancy

The team approached the problem by first proposing a range of different models that could potentially describe the internal structure of the Ds(2317) meson. Of key importance was the fact that each of the different models allows researchers to predict a specific range of potential values for the particle’s decay.

This was achieved based on the probability that the Ds(2317 meson will decay by emitting a gamma ray, which was then divided by an entirely separate probability: that the particle would emit a pion—a type of meson with a mass roughly 270 times that of an electron—rather than a gamma ray.

Based on these two possibilities, the team determined that measurements indicating a ratio of greater than 8.1% would point to the likelihood that the meson represents a compact state involving quark-antiquark models.

However, if the calculated value turned out to be lower—specifically in the range of between 0.5% and 4.25%—that would instead favor models that describe the particle as functioning closer to being a sort of molecule-like state of two separate mesons.

Well Above Standard Deviations

With such values in mind, the team then went to work to determine which was more likely with help from data collected by the Japanese KEKB and SuperKEKB electron–positron colliders.

Using this information, the particle’s gamma-emitting decay was successfully detected, revealing a statistical significance above ten standard deviations. Next, the Belle and Belle II Collaboration conducted measurements that showed the decay ratio between photons and pions was close to 7%, placing the determined value smaller than the majority of quark-antiquark models, and at a greater value than those in the molecular models.

“This result provides crucial discrimination between theoretical models of the Ds(2317) structure,” the team writes.

Going forward, the researchers believe additional insights that may help to conclusively reveal the mysterious Ds(2317) meson’s structure may be achievable through more complete measurements of the particle’s decay rate.

The recent paper, “Observation of the Radiative Decay 𝐷*𝑠0(2317)+→𝐷*𝑠+𝛾,” appeared in Physical Review Letters.

Micah Hanks is the Editor-in-Chief and Co-Founder of The Debrief. A longtime reporter on science, defense, and technology with a focus on space and astronomy, he can be reached at micah@thedebrief.org. Follow him on X @MicahHanks, and at micahhanks.com.

It’s not the kind of thing astronomers expect to see while observing the powerful effects of a distant supermassive black hole: an unprecedented UFO sighting.

However, that’s precisely what one group of scientists now reports in a preprint paper, who detail the successful detection of one of the strongest UFOs—a black hole phenomenon otherwise known as “ultra-fast outflows”—that astronomers may have ever seen.

The landmark detection was made possible with the XMM-Newton space observatory and NuSTAR X-ray telescope, which allowed the researchers behind the discovery to observe a luminous quasar with origins that date back to “cosmic noon,” revealing a pair of outflow wind components being blasted from the black hole in question.

Cosmic Monsters with Major Appetites

Black holes have more than just large appetites for cosmic material: they also produce significant gas-driven winds from around their accretion disk.

These winds become known as ultra-fast outflows (UFOs) when their strength propels them to greater than ten percent of light speed, and astronomers currently believe they are an important part of what helps black holes regulate their growth, which may also hold for their host galaxies.

One way this occurs is that UFOs help to heat galactic gases that give rise to star formation, a quenching process that most astronomers believe occurred during a period called “cosmic noon,” which occurred between 1.6 and 3.5 billion years after the birth of the universe.

Cosmic Fingerprints of Powerful UFOs

Astronomers can detect ultra-fast outflows based on the “dips” they create in their powerful gusts, which are caused by ionized iron present in their outflow gases. These gases also absorb X-rays along their path away from their black hole originators, which leave “fingerprints” in the form of absorption features that are detectable using X-ray telescopes.

Significantly, these “dips” manifest as a blueshift since they are shifted to higher energies as they move at such high speeds (again, roughly 10% of the speed of light). From the blueshifted energy signatures they comprise, astronomers can determine not only the presence of UFOs, but also the wind speed of their gusty outflows.

In the past, most detections of these high-powered cosmic phenomena have relied on gravitationally lensed quasars. These celestial objects occur when a galaxy or similar feature closer to Earth appears in front of them, magnifying the quasar’s light and significantly brightening its luminosity from our Earthly perspective.

However, lensing of this variety can also present problems, and so astronomers led by Giorgio Lanzuisi of INAF Bologna designed a special system to target more than a dozen hyper-luminous quasars at cosmic noon, as a means of getting a better feel for the dynamics of non-lensed quasars.

“WISSHFUL” Thinking

WISSHFUL is an XMM-Newton multi-year heritage program that Lanzuisi and his colleagues designed for this purpose, whose initial target became a quasar designated WISSH13, whose redshift at 3.294 marks the object’s existence as it appeared approximately 2 billion years after the Big Bang.

WISH13’s black hole also weighs in at close to 2 billion times that of our Sun, which causes it to shine far brighter than normally expected for an object of its estimated mass.

Their work began in the autumn of 2024 by combining observations from XMM-Newton and NuSTAR initially obtained in 2017. From these X-ray images of WISSH12, a pair of distinctive absorption features became evident, which the team determined to have been generated by two separate sources from within the same ultra-fast outflow.

These components were found to travel at different speeds: one moving at close to 30% of the speed of light, while the other at only about 10% of light speed. The slower of these two appears to have been an enduring component of the UFO, while the faster one showed signatures that indicated a more recent appearance. This could mean that it emanates from events that are shorter in duration.

By matching theoretical predictions of a layered wind structure surrounding the black hole, the researchers say their observations align with models that indicate a fast-moving inner “spine” launched from the accretion disk’s innermost regions. Meanwhile, a slower outer “sheath” is also believed to emanate farther from the black hole. The combined outflow components produce an estimated 21 to 24 solar masses of material annually.

The Most Massive UFO Ever Observed? 

Such figures, the team says, represent what is believed to be among the most massive and energetic ultrafast outflows ever observed, a discovery which also marks the highest-redshift ultrafast outflow yet detected in a non-lensed quasar.

Despite their remarkable energetic output, the team says these outflow winds seem to conform to the same essential relationships observed in active galaxies much closer to Earth, suggesting that the processes driving these outflows have remained remarkably consistent across cosmic time.

Going forward, the team says they hope to make additional observations of these powerful cosmic phenomena with help from the new Athena X-ray mission, which they say could help uncover similar winds in even more distant quasars.

The team’s discoveries were detailed in a recent paper, “The WISSHFUL program: the highest redshift UFO discovered in a non-lensed QSO,” which appeared at the preprint arXiv.org server.

Micah Hanks is the Editor-in-Chief and Co-Founder of The Debrief. A longtime reporter on science, defense, and technology with a focus on space and astronomy, he can be reached at micah@thedebrief.org. Follow him on X @MicahHanks, and at micahhanks.com.

Welcome to this week’s installment of The Intelligence Brief… in a recent sworn statement, it was revealed that the Pentagon has reportedly leveraged Elon Musk’s xAI to assist in the launch of as many as 2,000 munitions in the recent U.S. war with Iran. In our coverage, we’ll be looking at 1) how the recent revelations were brought to light in a lawsuit focused on possible violations of the Clean Air Act, 2) how a “frontier” AI chatbot became key part of the Pentagon’s military efforts, and 3) why lawmakers are sounding alarms over the potential misuse of AI systems, and the need for ensuring their safe use while restricting major decisions to human operators.

Quote of the Week

“We must act now—not to stifle technological progress, but to establish clear rules of the road that keep humans in charge and keep AI’s use in warfare smart and safe.”

– U.S. Senator Kirsten Gillibrand

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Musk’s AI Chatbot Helped U.S. Forces Fire Missiles

This week, as an initial deal aiming to end the U.S. war with Iran comes to fruition, it was revealed that thousands of missiles launched by the U.S. were fired by Elon Musk’s Grok chatbot.

The revelation emerged as part of a sworn statement pushing to protect the military’s use of Musk’s AI systems that could be impacted by a lawsuit, which alleges his xAI data centers are contributing to illegal pollution in black communities.

The statement, made by Cameron Stanley, the Pentagon’s chief digital and artificial intelligence officer, states that Musk’s AI chatbot helped to facilitate the deployment of “over 2,000 munitions to 2,000 distinct targets within 96 hours during Operation Epic Fury,” which Stanley called “a testament to the greatly increased operational efficiency made possible by the Grok Gov Model.”

A “Frontier” AI Chatbot

In Stanley’s sworn statement this week, the Pentagon official tasked with overseeing the Department of War’s use of AI wrote that xAI’s Grok is one of just four proprietary AI models “capable of supporting national security applications.”

Stanley wrote that xAI also “remains one of just three enterprise providers equipped to sustain mission-critical operations across Secret and Top-Secret classified networks for the foreseeable future due to the enormous resources required for initial certification.”

“DoW currently relies on derivatives of xAl’s commercial offerings known as the Grok Gov Model,” according to Stanley, who goes on to note in his statement that the AI chatbot has been deployed in systems that include Maven Smart Systems, where it assists in supporting “vital national security missions, including targeting, intelligence, readiness, and recruitment,” and also aids in a range of other military tasks.

“The Grok Gov Model offers features unique to xAI that are found in no other frontier Al model,” Stanley wrote. As an illustration of its capability, Stanley then made the chilling revelation of just how involved in military activities the xAI chatbot has recently become.

Grok Goes to War

“To further illustrate the uses of the Grok Gov Model within DoW, MSS frontier workflows enabled U.S. forces to deploy over 2,000 munitions to 2,000 distinct targets within 96 hours during Operation Epic Fury, a testament to the greatly increased operational efficiency made possible by the Grok Gov Model,” Stanley wrote in his testimony.

As reported by The Independent, the sworn statement provided by Stanley appears to represent the first confirmation by an official within the Trump Administration that Elon Musk’s AI is being used to control U.S. weapons used against Iran.

Since the conflict began in February, the Trump administration has faced scrutiny over U.S.-led attacks that have resulted in civilian deaths, with mounting questions over the military’s use of AI during the conflict.

In an analysis by the Lieber Institute at West Point, Jessica Dorsey and Luke Moffett noted that AI systems “are frequently framed as ushering in an era of unprecedented precision and efficiency in warfare,” but in reality, issues that include recent figures involving as many as 1,700 civilian deaths as of May 2026 “calls that narrative into serious question.”

“CENTCOM claimed it was generating 1,000 targets per hour,” Moffett and Dorsey wrote, adding that while “such capabilities are often framed as enhancing precision… they also introduce new layers of abstraction between decision-makers and the consequences of their actions.”

Pending Court Rulings Could Impact the Pentagon’s AI Use

The U.S. Department of Justice has argued that a pending court ruling could significantly impact the Pentagon’s use of AI if it is prevented from deploying xAI across its systems.

In an effort to prevent such setbacks, the Trump administration has requested that a lawsuit launched by the NAACP be dismissed by a Mississippi-based federal judge. The lawsuit claims that Musk’s xAI Colossus 2 data center, which relies on several dozen gas-powered turbines, is operating in violation of the Clean Air Act. Presently, the turbines are being operated without permits, the lawsuit asserts.

In his sworn statement this week, Stanley called Musk’s xAI systems a “long-term strategic tool vital to maintaining our technological advantage against adversaries.”

However, opponents of such measures in Washington argue that new regulations must help to ensure that crucial military decisions—especially those which impact human lives—must also be made by humans.

“The most critical decisions affecting our national security and the lives of our service members must always be made by human beings, not unaccountable machines,” wrote U.S. Senator Kirsten Gillibrand (D, NY) in a statement earlier in June.

Gillibrand also recently introduced a bill that aims to restrict military decisions that could potentially impact human lives to human operators, and to implement a ban on AI in governing the use of nuclear weapons, as well as autonomous weapons capabilities and domestic surveillance.

In her statement this month, Gillibrand argued that the Pentagon “is moving toward deploying incredibly powerful AI technology without commonsense guardrails in place, which could have catastrophic consequences that make all of us less safe.”

“We must act now—not to stifle technological progress, but to establish clear rules of the road that keep humans in charge and keep AI’s use in warfare smart and safe,” Gillibrand added.

That concludes this week’s installment of The Intelligence Brief. You can read past editions of our newsletter at our website, or if you found this installment online, don’t forget to subscribe and get future email editions from us here. Also, if you have a tip or other information you’d like to send along directly to me, you can email me at micah [@] thedebrief [dot] org, or reach me on X: @MicahHanks.

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