1,721,009 research outputs found
Erratum to: The minimal axion minimal linear σ model (The European Physical Journal C, (2018), 78, 5, (415), 10.1140/epjc/s10052-018-5892-z)
No full textIn this Erratum we clarify that in contrast to the statements made in the article the bounds on the axion coupling to two W’s and to two Z’s obtained from mono-W and mono-Z searches at the LHC are the following:(Formula presented.) The corresponding limits in terms of fa/ci are given by:(Formula presented.) This change has interesting phenomenological effects as the scale (Formula presented.) can be as low as 1 TeV: this MLσMALP can then be tested both at colliders and at flavour factories. Moreover, this model does not present any fine-tuning. Finally, a corrected version of the article is also available on the arXiv (arXiv:1710.10500)
Clone flow analysis for a theory inspired Neutrino Experiment planning
No full textThe presence of several clone solutions in the simultaneous measurement of () has been widely discussed in literature. In this letter we write the analytical formulae of the clones location in the () plane as a function of the physical input pair (). We show how the clones move with changing . The "clone flow" can be significantly different if computed (naively) from the oscillation probabilities or (exactly) from the probabilities integrated over the neutrino flux and cross-section. Using our complete computation we compare the clone flow of a set of possible future neutrino experiments: the CERN SuperBeam, BetaBeam and Neutrino Factory proposals. We show that the combination of these specific BetaBeam and SuperBeam does not help in solving the degeneracies. On the contrary, the combination of one of them with the Neutrino Factory Golden and Silver channel can be used, from a theoretical point of view, to solve completely the eightfold degeneracy
Bounds on Heavy Chiral Fermions
No full textWe derive the low-energy electroweak effective lagrangian for the case of additional heavy, unmixed, sequential fermions. Present data still allow for the presence of a new quark and/or lepton doublet with masses greater than , provided that these multiplets are sufficiently degenerate. Deviations of the effective lagrangian predictions from a full one-loop computation are sizeable only for fermion masses close to the threshold . Some of the constraints on new sequential fermions coming from accelerator results and cosmological considerations are presented. We point out that the new fermions can significantly affect the production and decay rate into of the intermediate Higgs at LHC
The impact of solar and atmospheric parameter uncertainties on the measurement of theta(13) and delta
No full textWe present in this paper the analysis of the measurement of the unknown PMNS parameters and at future LBL facilities performing complete three parameters fits, each time fully including in the fit one of the atmospheric and solar oscillation parameters within its present (future) error. We show that, due to the presence of degeneracies, present uncertainties on and worsen significantly the precision on (,) at future LBL experiments. Only if a precision on the atmospheric parameters at least similar to what expected at T2K-I is reached, then the sensitivities to and that have been presented in the literature for many facilities (where and are generally considered as fixed external inputs) can indeed be almost recovered.On the other hand, the impact on this measurement of the uncertainties on the solar parameters, and is already negligible. Our analysis has been performed using three reference setups: the SPL Super-Beam and the standard low- -Beam, both aiming toward a Mton Water \v{C}erenkov detector located at L=130 km; the 50 GeV Neutrino Factory with a 40 kton Magnetized Iron Detector to look for the ``golden channel'' with baseline L=3000 km and a 4 kton Emulsion Cloud Chamber to look for the ``silver channel'' with baseline L=732 km
The minimal massive Majoron Seesaw Model
Full text linkA convincing explanation of the smallness of neutrino masses is represented by the Type-I Seesaw mechanism, where the two measured neutrino mass differences can be generated by introducing at least two right-handed neutrinos. In an ultraviolet complete model, it is possible to dynamically generate the heavy Majorana scale through the spontaneous symmetry breaking of a global Abelian symmetry and the most economical realisation consists in coupling the two exotic neutral leptons to a singlet complex scalar field. The associated Goldstone boson is often dubbed as Majoron, which may achieve a non-vanishing mass by means of a small term that explicitly breaks the Abelian symmetry. In a generic model, the neutrino and Majoron mass generation mechanisms are completely uncorrelated. In this paper, instead, we reduce the landscape of possible models proposing a unique, minimal and predictive framework in which these two types of masses are strictly tied and arise from the same source. Bounds from various terrestrial and astrophysical experiments are discussed
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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