Anomalous tau neutrino appearance from light mediators in short-baseline neutrino experiments

被引：2
|
作者：
Dev, P. S. Bhupal [1 ,2 ]
Dutta, Bhaskar [3 ]
Han, Tao [4 ]
Kim, Doojin [3 ]
机构：
[1] Washington Univ, Dept Phys, St Louis, MO 63130 USA
[2] Washington Univ, McDonnell Ctr Space Sci, St Louis, MO 63130 USA
[3] Texas A&M Univ, Mitchell Inst Fundamental Phys & Astron, Dept Phys & Astron, College Stn, TX 77843 USA
[4] Univ Pittsburgh, Dept Phys & Astron, PITT PACC, Pittsburgh, PA 15260 USA
来源：
PHYSICS LETTERS B | 2024年 / 850卷
关键词：
B-L;
D O I：
10.1016/j.physletb.2024.138500
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We point out a new mechanism giving rise to anomalous tau neutrino appearance at the near detectors of beam -focused neutrino experiments, without extending the neutrino sector. The charged mesons (re +/-, K +/-) produced and focused in the target -horn system can decay to a (neutrino-philic) light mediator via the helicityunsuppressed three -body decays. If such a mediator carries non -vanishing hadronic couplings, it can also be produced via the bremsstrahlung of the incident proton beam. The subsequent decay of the mediator to a tau neutrino pair results in tau neutrino detection at the near detectors, which is unexpected under the standard three -flavor neutrino oscillation paradigm. We argue that the signal flux from the charged meson decays can be significant enough to discover the light mediator signal at the on -axis liquid -argon near detector of the DUNE experiment, due to the focusing of charged mesons. In addition, we show that ICARUS-NuMI, an off -axis near detector of the NuMI beam, as well as DUNE, can observe a handful of tau neutrino events induced by beamproton bremsstrahlung.
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页数：7
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