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The work was co-led by Ryan Patterson, Ph.D., at the California Institute of Technology (Caltech<\/a>) in Pasadena.<\/p>\n Patterson builds tools to track neutrino identity changes and to test whether matter behaves differently from antimatter.<\/p>\n By pulling together observations from two separate beamlines, the analysis reduces blind spots that any single detector leaves.<\/p>\n Why neutrinos matter<\/p>\n The analysis matters because neutrinos<\/a> are central to laws that shape stars, elements, and cosmic history.<\/p>\n Trillions pass through a person each second, and the weak interaction, a force that makes direct detections rare, leaves little trace.<\/p>\n Could neutrinos help explain why matter outlasted antimatter after the Big Bang, leaving stars and people behind?<\/p>\n This section of the analysis tracks how neutrinos switch among three identities during flight through Earth.<\/p>\n Physicists call each identity a flavor, a label tied to the charged particle produced in a hit.<\/p>\n A neutrino flavor is a mixture of three mass states, and mass ordering, which mass state is lightest, affects oscillation patterns.<\/p>\n How oscillations work<\/p>\n The analysis<\/a> relies on neutrino oscillation, flavors changing as neutrinos travel, which proves neutrinos have mass.<\/p>\n Oscillation happens because the mass states move with slightly different rhythms, so the mixture at arrival is changed.<\/p>\n Passage through rock adds the matter effect, electrons in Earth nudging oscillations, which helps separate ordering from other parameters.<\/p>\n Two beams, one goal<\/p>\n Using two long-baseline beams sent hundreds of miles through rock, the analysis compares experiments that track neutrino changes.<\/p>\n NOvA sends neutrinos<\/a> about 500 miles (810 km) from an accelerator near Chicago to a detector in Minnesota.<\/p>\n T2K launches a beam about 185 miles (295 km) from Tokai to the Super-Kamiokande detector in Kamioka.<\/p>\n Detecting rare hits<\/p>\n To succeed, the analysis depends on spotting the few neutrinos that finally interact inside huge detectors.<\/p>\n NOvA uses a 14,000-ton detector, 31 million pounds, made of cells filled with scintillator, a liquid that emits light when particles pass.<\/p>\n Super-Kamiokande sits about 0.6 miles (3,300 feet) underground, and Cherenkov light, blue flashes from fast particles, marks interactions.<\/p>\n NOvA-T2K measures the mass gap<\/p>\n One focus of the analysis is the mass gap that sets oscillation speed, especially for muon neutrinos in accelerator beams.<\/p>\n Physicists<\/a> report a mass-squared difference, a number set by squared masses, because oscillations depend on that spacing.<\/p>\n Matching NOvA and T2K results squeezes the allowed range, because each experiment samples a different part of the oscillation pattern.<\/p>\n Even with improved precision, the analysis still cannot choose the ordering of the three neutrino masses.<\/p>\n One option has two lighter mass states and one heavier, while the other option flips that pattern.<\/p>\n Mass ordering guides how future experiments interpret oscillations, because the same data can mimic different physics under each ordering.<\/p>\n Neutrinos vs antineutrinos<\/p>\n Another test within the analysis asks whether neutrinos behave differently from antineutrinos, antimatter<\/a> partners of neutrinos in the lab, during oscillation.<\/p>\n Antineutrinos often create opposite-charge particles, so sign tracking helps separate neutrino interactions from antineutrino interactions.<\/p>\n The matter mystery centers on why the universe is made primarily of matter instead of antimatter.<\/p>\n Separating two asymmetries<\/p>\n A key challenge for the analysis is separating a built-in neutrino difference from extra effects caused by travel through Earth.<\/p>\n Different baselines and energies help disentangle effects, because an oscillation pattern can come from either ordering or intrinsic asymmetry.<\/p>\n A violation of charge-parity symmetry, matter and antimatter<\/a> reacting differently, could seed more matter than antimatter in the young cosmos.<\/p>\n What the data says<\/p>\n So far, the analysis showed that two different detectors can tell a consistent story about neutrino mixing.<\/p>\n Shared fitting methods let researchers compare systematic uncertainties across experiments, so disagreements could not hide behind separate assumptions.<\/p>\n Sharper neutrino parameters help designers predict event rates, which matters when detectors must wait years for enough interactions.<\/p>\n Next steps for NOvA-T2K<\/p>\n Despite progress, the analysis leaves open the biggest questions, and more data will be needed to rule out look-alikes.<\/p>\n Beam intensity, detector calibration, and background noise can all mimic an effect, so careful controls matter as much as size.<\/p>\n Both collaborations plan additional combined fits as new runs finish, and the broader neutrino program<\/a> is gearing up for larger baselines.<\/p>\n Results from the analysis sets a benchmark that next-generation experiments can beat by collecting more events and longer distances.<\/p>\n Deep Underground Neutrino Experiment (DUNE<\/a>) will send neutrinos about 800 miles through Earth to detectors in South Dakota, using a strong beam.<\/p>\n Japan is building Hyper-Kamiokande<\/a> to start experimentation in 2028 with a much larger water detector.<\/p>\n As new data arrive, the analysis will be tested as new data arrive, especially where neutrino and antineutrino patterns diverge.<\/p>\n Clear answers will depend on patience and statistics, because the rarest events carry the strongest clues about fundamental physics.<\/p>\n The study is published in Nature<\/a>.<\/p>\n Image credit: Reidar Hahn\/Fermilab.<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"The joint NOvA-T2K analysis combined years of data to measure a neutrino mass difference with less than 2%…\n","protected":false},"author":2,"featured_media":402960,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49],"tags":[199,79],"class_list":{"0":"post-402959","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-physics","8":"tag-physics","9":"tag-science"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/402959","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/comments?post=402959"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/402959\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media\/402960"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media?parent=402959"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/categories?post=402959"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/tags?post=402959"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}