We have constrained unparticle interactions with neutrinos and electrons using available data on neutrino-electron elastic scattering and the four CERN LEP experiments data on mono photon production. We have found that, for neutrino-electron elastic scattering, the MUNU experiment gives better constraints than previous reported limits in the region d>1.5. The results are compared with the current astrophysical limits, pointing out the cases where these limits may or may not apply. We also discuss the sensitivity of future experiments to unparticle physics. In particular, we show that the measurement of coherent reactor neutrino scattering off nuclei could provide a good sensitivity to the couplings of unparticle interaction with neutrinos and quarks. We also discuss the case of future neutrino-electron experiments as well as the International Linear Collider.
We consider a scenario where ultra high energy neutrinos undergo unparticle decay during its passage from its cosmological source to Earth. The idea of unparticle had been first proposed by Georgi by considering the possible existence of an unknown scale invariant sector at high energies and the unparticles in this sector manifest itself below a dimensional transmutation scale $Λ_{\cal U}$. We then explore the possible signature of such decaying neutrinos to unparticles at a square kilometer detector such as IceCube.
Neutrino, Photon Interaction in Unparticle Physics
我们研究了非粒子物理学对遗迹中微子湮灭的影响，中微子被认为是超高能宇宙线事件的主要来源，产生了一系列光子和带电粒子。计算了非粒子交换对$ν\barν\toγγ$和$ν\barν\to f \bar f$散射截面的贡献。我们从$ν\barν\toγγ$的反应速率估算了中微子光子退耦温度。我们发现，在一定范围内，非粒子的加入不仅可以解释UHE宇宙射线的通量，而且可以导致中微子-光子退耦温度降低到QCD相变以下。我们计算了这些高能中微子与残余中微子湮灭产生矢量和张量非粒子的平均自由程。
Constraints on Unparticle Physics from Solar and KamLAND Neutrinos
最近，人们的兴趣已经转向具有IR不动点（Λ）的有效场论的非平凡共形扇区的低能含义，表现为具有奇异性质的“非粒子”。我们重新研究了太阳中微子衰变寿命的极限对非粒子相互作用的影响。我们详细研究了基本参数空间（Λ，M），并推导出表征新物理的能量标度M的界限。我们的工作严格的框架内，共形不变性举行了低能量。我们首先假设非粒子扇区与希格斯场的耦合被抑制，并从中微子衰变为标量非粒子导出在TeV区域中的Λ的界限。这些界限对于非粒子算子的反常维数1.0 < d < 1.2的值是重要的。对于一个区域的参数空间，我们表明，边界是可比的生产率在高能量对撞机。然后我们放松我们的假设，考虑一个更自然的框架，不需要先验限制的希格斯粒子的耦合操作，并推导出在meV区域从中微子衰变到矢量非粒子与Λ的界限。IR不动点的这种低标度在各种风格的规范理论中都有相关性。
Neutrino-electron scattering is a purely leptonic fundamental interaction and therefore provides an important channel to test the Standard Model, especially at the low energy-momentum transfer regime. We derived constraints on neutrino nonstardard interaction couplings depending on model-independent approaches which are described by a four-Fermi pointlike interaction and unparticle physics model with tensorial components. Data on $\barν_{e}-e$ and $ν_{e}-e$ scattering from the TEXONO and LSND experiments, respectively, are used. The upper limits and the allowed regions of scalar, pseudoscalar,…
Neutrino oscillation phenomenology is briefly reviewed, and impact of the late Professor Masatoshi Koshiba on research on neutrino oscillation is discussed from the viewpoint of phenomenology.
In this talk, I give an overview on recent theoretical and phenomenological studies of massive neutrinos. First of all, the present status of neutrino mixing parameters is summarized. The phenomenology of neutrino oscillations is then discussed, and current understanding of lepton flavor mixing is presented. Finally, I consider the seesaw models of neutrino masses and briefly mention the direct searches at the CERN Large Hadron Collider (LHC).
We study the phenomenology of d=7 1-loop neutrino mass models. All models in this particular class require the existence of several new $SU(2)_L$ multiplets, both scalar and fermionic, and thus predict a rich phenomenology at the LHC. The observed neutrino masses and mixings can easily be fitted in these models. Interestingly, despite the smallness of the observed neutrino masses, some particular lepton number violating (LNV) final states can arise with observable branching ratios. These LNV final states consists of leptons and gauge bosons with high multiplicities, such as 4l+4W, 6l+2W, etc. …
The Zee model for Dirac neutrinos is one of the simplest models featuring one-loop Dirac neutrino masses. The interactions between the new scalars (two singly-charged fields) and neutrinos induce general neutrino interactions (GNI) which, as a generalisation of the non standard neutrino interactions, constitute an additional tool to probe models beyond the SM like this. In this work, we consider a $U(1)_{B-L}$ gauge symmetry as the responsible for the Diracness of the neutrinos and the radiative character of the neutrino masses. We determine the viable parameter space consistent with neutrino …
In this thesis we investigate several topics in neutrino physics, with an em- phasis on the phenomenology of the sterile neutrinos. We study the existence of a light sterile neutrino within the so called 3+1 scenario using the data of the medium baseline reactor experiments. We will also probe the parameters of the Large Extra Dimension model with the high energy atmospheric data of the IceCube experiment, and will find an equivalence between the Kaluza Klein modes and the sterile neutrinos. We will study the secret interaction of the ster- ile neutrinos which is proposed to solve the tension …
In this paper, we present several possible anomaly-free implementations of the Branco-Grimus-Lavoura (BGL) model with two Higgs doublets and one singlet scalar. The model also includes three generations of massive neutrinos that get their mass via a type-I seesaw mechanism. A particular anomaly-free realization, which we dub $ν$BGL-1 scenario, is subjected to an extensive phenomenological analysis, from the perspective of flavour physics and collider phenomenology.
