Direct neutrino-mass measurement based on 259 days of KATRIN data.
Saved in:
| Title: | Direct neutrino-mass measurement based on 259 days of KATRIN data. |
|---|---|
| Authors: | Aker, Max, Batzler, Dominic, Beglarian, Armen, Behrens, Jan, Beisenkötter, Justus, Biassoni, Matteo, Bieringer, Benedikt, Biondi, Yanina, Block, Fabian, Bobien, Steffen, Böttcher, Matthias, Bornschein, Beate, Bornschein, Lutz, Caldwell, Tom S., Carminati, Marco, Chatrabhuti, Auttakit, Chilingaryan, Suren, Daniel, Byron A., Debowski, Karol, Descher, Martin |
| Source: | Science. 4/11/2025, Vol. 388 Issue 6743, p180-185. 6p. |
| Subjects: | Neutrino mass, Particles (Nuclear physics), Physical cosmology, Spectrometry, Tritium |
| Abstract: | That neutrinos carry a nonvanishing rest mass is evidence of physics beyond the Standard Model of elementary particles. Their absolute mass holds relevance in fields from particle physics to cosmology. We report on the search for the effective electron antineutrino mass with the KATRIN experiment. KATRIN performs precision spectroscopy of the tritium β-decay close to the kinematic endpoint. On the basis of the first five measurement campaigns, we derived a best-fit value of m ν 2 = − 0.14 − 0.15 + 0.13 eV2, resulting in an upper limit of mν < 0.45 eV at 90% confidence level. Stemming from 36 million electrons collected in 259 measurement days, a substantial reduction of the background level, and improved systematic uncertainties, this result tightens KATRIN's previous bound by a factor of almost two. Editor's summary: The neutrino, a weakly interacting, uncharged elementary particle, has been shown to have a nonzero mass, the exact value of which remains unknown. This is not what the usually very reliable Standard Model of particle physics predicts, which means that measuring the neutrino mass may offer hints of physics that this model cannot account for. The KATRIN Collaboration used the beta-decay of molecular tritium to directly measure the mass of the antiparticle of a particular flavor of the neutrino (see the Perspective by Gastaldo). By combining data from the first five runs of the experiment, the researchers reduced the upper limit on the neutrino mass by a factor of two compared with their previous result. —Jelena Stajic [ABSTRACT FROM AUTHOR] |
| Copyright of Science is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Psychology and Behavioral Sciences Collection |
|
Full text is not displayed to guests.
Login for full access.
|
|
| Abstract: | That neutrinos carry a nonvanishing rest mass is evidence of physics beyond the Standard Model of elementary particles. Their absolute mass holds relevance in fields from particle physics to cosmology. We report on the search for the effective electron antineutrino mass with the KATRIN experiment. KATRIN performs precision spectroscopy of the tritium β-decay close to the kinematic endpoint. On the basis of the first five measurement campaigns, we derived a best-fit value of m ν 2 = − 0.14 − 0.15 + 0.13 eV2, resulting in an upper limit of mν < 0.45 eV at 90% confidence level. Stemming from 36 million electrons collected in 259 measurement days, a substantial reduction of the background level, and improved systematic uncertainties, this result tightens KATRIN's previous bound by a factor of almost two. Editor's summary: The neutrino, a weakly interacting, uncharged elementary particle, has been shown to have a nonzero mass, the exact value of which remains unknown. This is not what the usually very reliable Standard Model of particle physics predicts, which means that measuring the neutrino mass may offer hints of physics that this model cannot account for. The KATRIN Collaboration used the beta-decay of molecular tritium to directly measure the mass of the antiparticle of a particular flavor of the neutrino (see the Perspective by Gastaldo). By combining data from the first five runs of the experiment, the researchers reduced the upper limit on the neutrino mass by a factor of two compared with their previous result. —Jelena Stajic [ABSTRACT FROM AUTHOR] |
|---|---|
| ISSN: | 00368075 |
| DOI: | 10.1126/science.adq9592 |
