An improved upper limit on the neutrino mass from a direct kinematic method by KATRIN. (arXiv:1909.06048v1 [hep-ex])

An improved upper limit on the neutrino mass from a direct kinematic method by KATRIN. (arXiv:1909.06048v1 [hep-ex])
<a href="http://arxiv.org/find/hep-ex/1/au:+Aker_M/0/1/0/all/0/1">M. Aker</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Altenmuller_K/0/1/0/all/0/1">K. Altenmüller</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Arenz_M/0/1/0/all/0/1">M. Arenz</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Babutzka_M/0/1/0/all/0/1">M. Babutzka</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Barrett_J/0/1/0/all/0/1">J. Barrett</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Bauer_S/0/1/0/all/0/1">S. Bauer</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Beck_M/0/1/0/all/0/1">M. Beck</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Beglarian_A/0/1/0/all/0/1">A. Beglarian</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Behrens_J/0/1/0/all/0/1">J. Behrens</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Bergmann_T/0/1/0/all/0/1">T. Bergmann</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Besserer_U/0/1/0/all/0/1">U. Besserer</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Blaum_K/0/1/0/all/0/1">K. Blaum</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Block_F/0/1/0/all/0/1">F. Block</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Bobien_S/0/1/0/all/0/1">S. Bobien</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Bokeloh_K/0/1/0/all/0/1">K. Bokeloh</a> (nee Hugenberg), <a href="http://arxiv.org/find/hep-ex/1/au:+Bonn_J/0/1/0/all/0/1">J. Bonn</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Bornschein_B/0/1/0/all/0/1">B. Bornschein</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Bornschein_L/0/1/0/all/0/1">L. Bornschein</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Bouquet_H/0/1/0/all/0/1">H. Bouquet</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Brunst_T/0/1/0/all/0/1">T. Brunst</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Caldwell_T/0/1/0/all/0/1">T. S. Caldwell</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Cascio_L/0/1/0/all/0/1">L. La Cascio</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Chilingaryan_S/0/1/0/all/0/1">S. Chilingaryan</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Choi_W/0/1/0/all/0/1">W. Choi</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Corona_T/0/1/0/all/0/1">T. J. Corona</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Debowski_K/0/1/0/all/0/1">K. Debowski</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Deffert_M/0/1/0/all/0/1">M. Deffert</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Descher_M/0/1/0/all/0/1">M. Descher</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Doe_P/0/1/0/all/0/1">P. J. Doe</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Dragoun_O/0/1/0/all/0/1">O. Dragoun</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Drexlin_G/0/1/0/all/0/1">G. Drexlin</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Dunmore_J/0/1/0/all/0/1">J. A. Dunmore</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Dyba_S/0/1/0/all/0/1">S. Dyba</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Edzards_F/0/1/0/all/0/1">F. Edzards</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Eisenblatter_L/0/1/0/all/0/1">L. Eisenblätter</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Eitel_K/0/1/0/all/0/1">K. Eitel</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Ellinger_E/0/1/0/all/0/1">E. Ellinger</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Engel_R/0/1/0/all/0/1">R. Engel</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Enomoto_S/0/1/0/all/0/1">S. Enomoto</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Erhard_M/0/1/0/all/0/1">M. Erhard</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Eversheim_D/0/1/0/all/0/1">D. Eversheim</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Fedkevych_M/0/1/0/all/0/1">M. Fedkevych</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Felden_A/0/1/0/all/0/1">A. Felden</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Fischer_S/0/1/0/all/0/1">S. Fischer</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Flatt_B/0/1/0/all/0/1">B. Flatt</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Formaggio_J/0/1/0/all/0/1">J. A. Formaggio</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Frankle_F/0/1/0/all/0/1">F. M. Fränkle</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Franklin_G/0/1/0/all/0/1">G. B. Franklin</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Frankrone_H/0/1/0/all/0/1">H. Frankrone</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Friedel_F/0/1/0/all/0/1">F. Friedel</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Fuchs_D/0/1/0/all/0/1">D. Fuchs</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Fulst_A/0/1/0/all/0/1">A. Fulst</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Furse_D/0/1/0/all/0/1">D. Furse</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Gauda_K/0/1/0/all/0/1">K. Gauda</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Gemmeke_H/0/1/0/all/0/1">H. Gemmeke</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Gil_W/0/1/0/all/0/1">W. Gil</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Gluck_F/0/1/0/all/0/1">F. Glück</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Gorhardt_S/0/1/0/all/0/1">S. Görhardt</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Groh_S/0/1/0/all/0/1">S. Groh</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Grohmann_S/0/1/0/all/0/1">S. Grohmann</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Grossle_R/0/1/0/all/0/1">R. Grössle</a>, <a href="http://arxiv.org/find/hep-ex/1/au:+Gumbsheimer_R/0/1/0/all/0/1">R. Gumbsheimer</a>, et al. (147 additional authors not shown)

We report on the neutrino mass measurement result from the first four-week
science run of the Karlsruhe Tritium Neutrino experiment KATRIN in spring 2019.
Beta-decay electrons from a high-purity gaseous molecular tritium source are
energy analyzed by a high-resolution MAC-E filter. A fit of the integrated
electron spectrum over a narrow interval around the kinematic endpoint at 18.57
keV gives an effective neutrino mass square value of $(-1.0^{+0.9}_{-1.1})$
eV$^2$. From this we derive an upper limit of 1.1 eV (90$%$ confidence level)
on the absolute mass scale of neutrinos. This value coincides with the KATRIN
sensitivity. It improves upon previous mass limits from kinematic measurements
by almost a factor of two and provides model-independent input to cosmological
studies of structure formation.

http://arxiv.org/icons/sfx.gif