New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs.

  title={New Constraint on the Local Relic Neutrino Background Overdensity with the First KATRIN Data Runs.},
  author={Max Aker and D. Batzler and Armen Beglarian and Jan Behrens and Anatoly Berlev and Uwe Besserer and Benedikt Bieringer and Fabian Block and Steffen Bobien and Beate Bornschein and Lutz Bornschein and Matthias B{\"o}ttcher and Tim Brunst and Thomas S. Caldwell and R. M. D. Carney and Suren Chilingaryan and Wonqook Choi and Karol Debowski and Martin Descher and D. D{\'i}az Barrero and Peter J. Doe and Otokar Dragoun and Guido Drexlin and Frank Edzards and K. Eitel and Enrico Ellinger and Ralph Engel and Sanshiro Enomoto and Arne Felden and Joseph A. Formaggio and Florian Fr{\"a}nkle and Gregg B. Franklin and Fabian Friedel and Alexander Fulst and Kevin Gauda and Amanda Salom{\~a}o Gavin and Woosik Gil and Ferenc Gl{\"u}ck and Robin Gr{\"o}ssle and Rainer Gumbsheimer and Volker Hannen and Norman Haussmann and Klaus Helbing and Stephanie Virginia Hickford and R. Hiller and David Hillesheimer and Dominic Hinz and Thomas H{\"o}hn and Th. Houdy and Anton Huber and Alexander Jansen and Christian Karl and F. Kellerer and Jonas Kellerer and M. Kleifges and M. Klein and Christof K{\"o}hler and Leonard K{\"o}llenberger and Andreas Kopmann and Marc Korzeczek and A. Koval{\'i}k and Bennet Krasch and Holger Krause and Luisa La Cascio and Thierry Lasserre and Thanh-Long Le and Ondrej Lebeda and Bj{\"o}rn Lehnert and Alexey Lokhov and Moritz Machatschek and Emma Malcherek and Martin Mark and Alexander Marsteller and Erica Leanne Martin and Christin Melzer and Susanne Mertens and J. Mostafa and Klaus M{\"u}ller and Holger Neumann and Simon Niemes and Patrick Oelpmann and Diana S. Parno and Alan W. P. Poon and Jose M. Lopez Poyato and Florian Priester and Jan R{\'a}li{\vs} and S. Ramachandran and R. G. Hamish Robertson and Werner Rodejohann and Caroline Rodenbeck and Marco R{\"o}llig and Carsten R{\"o}ttele and Milos Rysavy and Rudolf Sack and Amadeo Saenz and Robert Salomon and Peter Sch{\"a}fer and Lutz Schimpf and Magnus Schl{\"o}sser and Klaus Schl{\"o}sser and Lisa Schl{\"u}ter and S. Schneidewind and Michael Schrank and A. Schwemmer and M. {\vS}ef{\vc}{\'i}k and Val{\'e}rian Sibille and Daniel Siegmann and M. Slez{\'a}k and Felix Spanier and Markus Steidl and Michael Sturm and H. H. Telle and Larisa A. Thorne and Thomas Th{\"u}mmler and Nikita Titov and I. F. Tkachev and Korbinian Urban and Kathrin Valerius and Drahoslav V{\'e}nos and A. P. Vizcaya Hern{\'a}ndez and Christian Weinheimer and Stefan Welte and J{\"u}rgen Wendel and Christoph Wiesinger and John F. Wilkerson and Jack Keil Wolf and Sascha W{\"u}stling and Jakub Wydra and W. Xu and Sergey Zadoroghny and Genrich Zeller},
  journal={Physical review letters},
  volume={129 1},
We report on the direct search for cosmic relic neutrinos using data acquired during the first two science campaigns of the KATRIN experiment in 2019. Beta-decay electrons from a high-purity molecular tritium gas source are analyzed by a high-resolution MAC-E filter around the end point at 18.57 keV. The analysis is sensitive to a local relic neutrino overdensity ratio of η<9.7×10^{10}/α (1.1×10^{11}/α) at a 90% (95%) confidence level with α=1 (0.5) for Majorana (Dirac) neutrinos. A fit of the… 

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