Suchergebnisse

We address the validity of the usual procedure to determine the sensitivity of neutrino oscillation experiments to CP violation. An explicit calibration of the test statistic is performed through Monte Carlo simulations for several experimental setups. We find that significant deviations from a chi(2) distribution with one degree of freedom occur for experimental setups with low sensitivity to ffi. In particular, when the allowed region to which ffi is constrained at a given confidence level is comparable to the whole allowed range, the cyclic nature of the variable manifests and the premises of Wilk's theorem are violated. This leads to values of the test statistic significantly lower than a chi(2) distribution at that confidence level. On the other hand, for facilities which can place better constraints on ffi the cyclic nature of the variable is hidden and, as the potential of the facility improves, the values of the test statistics first become slightly higher than and then approach asymptotically a chi(2) distribution. The role of sign degeneracies is also discussed. ; Goran Gustafsson Foundation ; U.S. Department of Energy [DE-SC0003915] ; European Union [PCIG11-GA-2012-321582] ; ITN INVISIBLES [PITN-GA-2011-289442] ; Spanish MINECO [RYC2011-07710, FPA2009-09017] ; We are very grateful to Thomas Schwetz for valuable discussions and encouragement. We warmly thank Peter Ballett for pointing out an inconsistency in the treatment of the systematic errors in the first version of the manuscript, and Pilar Hernandez for illuminating discussions. This work was supported by the Goran Gustafsson Foundation [MB] and by the U.S. Department of Energy under award number DE-SC0003915 [PC]. EFM acknowledges financial support by the European Union through the FP7 Marie Curie Actions CIG NeuProbes (PCIG11-GA-2012-321582) and the ITN INVISIBLES (PITN-GA-2011-289442), and the Spanish MINECO through the "Ramon y Cajal" programme (RYC2011-07710) and through the project FPA2009-09017. We also thank the Spanish MINECO (Centro de excelencia Severo Ochoa Program) under grant SEV-2012-0249 as well as the Nordita Scientific program "News in Neutrino Physics", where part of this work was performed.

The ESS nu SB project is a proposed neutrino oscillation experiment based on the European Spallation Source with the search for leptonic CP violation as its main aim. In this letter we show that a near detector at around 1 km distance from the beamline is not only very desirable for keeping the systematic errors affecting the CP search under control, but would also provide a significant sensitivity probe for sterile neutrino oscillations in the region of the parameter space favored by the long-standing LSND anomaly. We find that the effective mixing angle theta(mu e) can be probed down to sin(2)(2 theta(mu e)) similar or equal to 2(8) . 10(-3) at 5 sigma assuming 15% bin-to-bin (un) correlated systematics. ; Goran Gustafsson Foundation ; U.S. Department of Energy [DE-SC0003915] ; European Union through FP7 Marie Curie Actions CIG NeuProbes [PCIG11-GA-2012-321582] ; European Union through ITN INVISIBLES [PITN-GA-2011-289442] ; Spanish MINECO through "Ramon y Cajal" programme [RYC2011-07710] ; Spanish MINECO [FPA2009-09017] ; Spanish MINECO (Centro de excelencia Severo Ochoa Program) [SEV-2012-0249] ; This work has been supported by the Goran Gustafsson Foundation [MB], and by the U.S. Department of Energy under award number DE-SC0003915 [PC]. EFM acknowledges financial support by the European Union through the FP7 Marie Curie Actions CIG NeuProbes (PCIG11-GA-2012-321582) and the ITN INVISIBLES (PITN-GA-2011-289442), and the Spanish MINECO through the "Ramon y Cajal" programme (RYC2011-07710) and through the project FPA2009-09017. We also thank the Spanish MINECO (Centro de excelencia Severo Ochoa Program) under grant SEV-2012-0249 as well as the Nordita Scientific program "News in Neutrino Physics", where this work was initiated.

AbstractCurrent science policy emphasizes practical outcomes. In this article, I explore how a fundamental research community addresses the value of research, an area that has received a little attention. In the wake of the discovery of the Higgs boson, I analyse how particle physicists interpret the values of their research in interviews and a strategic document. The result indicates a hierarchy of interests that coordinates different values of particle physics in discourse: the status of scientific and cultural value is higher than that of societal and material value. This finding implies that value propositions are inseparable from the articulation of interests, and qualitative discourse analysis can approach a combined understanding of the two. In science policy studies, there is not yet sufficient studies on how scientists appraise different values of research. The hierarchical discursive practice on values shed lights on a culture different from policy trends.

The research of A.D. and D.P.M. were funded by the Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq-Brazil) and by Project INCT-FNA Proc. No. 464898/2014-5, and by FAPESP under grant 2016/17612-7 (A.D.). The work of E.M. is funded by the Spanish MINEICO under Grant FIS2017-85053-C2-1-P, by the FEDER Andalucia 2014-2020 Operational Programme under Grant A-FQM-178-UGR18, by Junta de Andalucia under Grant FQM-225, by the Consejeria de Conocimiento, Investigacion y Universidad of the Junta de Andalucia and European Regional Development Fund (ERDF) under Grant SOMM17/6105/UGR, and by the Spanish Consolider Ingenio 2010 Programme CPAN under Grant CSD2007-00042. The research of E.M. is also supported by the Ramon y Cajal Program of the Spanish MINEICO under Grant RYC-2016-20678. ; We would like to thank Constantino Tsallis for suggesting us to write this review ; In this work, we provide an overview of the recent investigations on the non-extensive Tsallis statistics and its applications to high energy physics and astrophysics, including physics at the Large Hadron Collider (LHC), hadron physics, and neutron stars. We review some recent investigations on the power-law distributions arising in high energy physics experiments focusing on a thermodynamic description of the system formed, which could explain the power-law behavior. The possible connections with a fractal structure of hadrons is also discussed. The main objective of the present work is to delineate the state-of-the-art of those studies and show some open issues that deserve more careful investigation. We propose several possibilities to test the theory through analyses of experimental data. ; Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ) ; Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) 2016/17612-7 ; Spanish MINEICO FIS2017-85053-C2-1-P ; FEDER Andalucia 2014-2020 Operational Programme A-FQM-178-UGR18 ; Junta de Andalucia FQM-225 ; Junta de Andalucia ; European Commission SOMM17/6105/UGR ; Spanish Government CSD2007-00042 ; German Research Foundation (DFG) RYC-2016-20678 ; Project INCT-FNA 464898/2014-5

Light sterile neutrinos can be probed in a number of ways, including electroweak decays, cosmology and neutrino oscillation experiments. At long-baseline experiments, the neutral-current data is directly sensitive to the presence of light sterile neutrinos: once the active neutrinos have oscillated into a sterile state, a depletion in the neutral-current data sample is expected since they do not interact with the Z boson. This channel offers a direct avenue to probe the mixing between a sterile neutrino and the tau neutrino, which is currently only weakly constrained by current data from SuperK, IceCube and NOvA, however, these constrains will continue to improve as more data is collected by these experiments. In this work, we study the potential of the DUNE experiment to constrain the mixing angle which parametrizes this mixing, theta(34), through the observation of neutral-current events at the far detector. We find that DUNE will be able to improve significantly over current constraints thanks to its large statistics and excellent discrimination between neutral- and charged-current events. ; Sao Paulo Research Foundation (FAPESP) [2014/19164-6, 2017/01749-6] ; U.S. Department Of Energy [DE-SC0013632, DE-SC0009973] ; European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [674896] ; U.S. Department of Energy, Office of Science, Office of High Energy Physics [DE-AC02-07CH11359] ; We warmly thank Michel Sorel for providing us with the smearing matrices needed to simulate the liquid Argon detector reconstruction for neutral-current events. PC also thanks Enrique Fernandez-Martinez for useful discussions. DVF is thankful for the support of Sao Paulo Research Foundation (FAPESP) funding Grant No. 2014/19164-6 and 2017/01749-6., and also for the URA fellowship that allowed him to visit the theory department at Fermilab where this project started. DVF was also supported by the U.S. Department Of Energy under contracts DE-SC0013632 and DE-SC0009973. This work has received partial support from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 674896. This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes.