NOvA releases

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Second Results

NOvA shines new light on how neutrinos behave

Fermilab Press Release, August 8, 2016 - Peter Shanahan and Mark Messier

Scientists from the NOvA collaboration have announced an exciting new result that could improve our understanding of the behavior of neutrinos. Neutrinos have previously been detected in three types, called flavors – muon, tau and electron. They also exist in three mass states, but those states don’t necessarily correspond directly to the three flavors. They relate to each other through a complex (and only partially understood) process called mixing, and the more we understand about how the flavors and mass states connect, the more we will know about these mysterious particles. NOvA scientists have seen evidence that one of the three neutrino mass states might not include equal parts of muon and tau flavor, as previously thought. Scientists refer to this as “nonmaximal mixing,” and NOvA’s preliminary result is the first hint that this may be the case for the third mass state. full text

Эксперимент NOvA обнаружил новые свойства нейтрино

Перевод релиза на Чердаке, 12/08/2016 - Анатолий Буткевич и Александр Ольшевский

Ученые из коллаборации NOvA представили доказательство того, что третье массовое состояние, v3, содержит неодинаковые доли мюонных и тау-нейтрино. Физики называют этот эффект «немаксимальное смешивание». полный текст статьи

Mix and mass: teasing out neutrino transformations

Fermilab News at Work, July 14, 2016 - Fernanda Psihas

NOvA released new results on the rate of electron neutrino appearance at the XXVII International Conference on Neutrino Physics and Astrophysics, or Neutrino 2016, which ended last week. NOvA observed 33 electron neutrinos appearing in its muon neutrino beam; without oscillations, only eight counts from backgrounds would have been expected. This rate is close to the maximum expected in standard three-flavor oscillation scenarios and, in combination with constraints from the muon neutrino disappearance result also reported last week, prefers the normal hierarchy and large CP violation. Although this preference is not yet statistically significant, the new results rule out a range of possibilities in the inverted hierarchy scenario helping narrow in on the correct solution. full text

Nonmaximal thrill seekers

Fermilab News at Work, July 4, 2016 - Bruno Zamorano and Gregory Pawloski

The figure above shows the latest counts of muon neutrinos versus energy reported at the Neutrino 2016 conference in London. In the absence of oscillations we would expect to see 473 muon neutrinos, but only 78 were actually observed — very strong evidence of oscillation. But the most important highlight of this result is that the shape of the data is best described by a nonmaximal scenario. This is a very intriguing hint, but the case against maximal mixing is not iron-clad. With current data, the result has 2.5 sigma significance, which means that there is still a 1.2 percent chance that maximal mixing could have produced the data seen by NOvA. Particle physicists do not like to gamble and typically require probabilities as small as 0.3 percent (or 3 sigma) to claim evidence and as small as 0.00006 percent (5 sigma) for discovery. full text

First Oscillation Results

Fermilab experiment sees neutrinos change over 500 miles

Fermilab Press Release, August 7, 2015- Mark Messier and Peter Shanahan

Scientists on the NOvA experiment saw their first evidence of oscillating neutrinos, confirming that the extraordinary detector built for the project not only functions as planned but is also making great progress toward its goal of a major leap in our understanding of these ghostly particles. full text

Выход в новую физику

Чердак 21/08/2015 - Анатолий Буткевич и Александр Ольшевский

Нейтрино, пожалуй, самые загадочные из известных элементарных частиц. Они почти не взаимодействуют с веществом, поэтому их очень трудно «ловить», но именно нейтрино во многом определили облик Вселенной. «Чердак» узнал у физиков, работающих на нейтринном эксперименте NOvA, как ученые ловят эти частицы и почему это столь важно. полный текст статьи