利用中微子望远镜测量13个中微子混合角和CP相位。

Measuring the 13 neutrino mixing angle and the CP phase with neutrino telescopes.

作者信息

Serpico P D, Kachelriess M

机构信息

Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, 80805 München, Germany.

出版信息

Phys Rev Lett. 2005 Jun 3;94(21):211102. doi: 10.1103/PhysRevLett.94.211102.

DOI:10.1103/PhysRevLett.94.211102

PMID:16090307

Abstract

The observed excess of high-energy cosmic rays from the Galactic plane in the energy range around 10(18) eV may be explained by neutron primaries generated in the photodissociation of heavy nuclei. In this scenario, lower-energy neutrons decay before reaching the Earth and produce a detectable flux in a 1 km(3) neutrino telescope. The initial flavor composition of the neutrino flux, phi(nu(e)):phi(nu(mu)):phi(nu(tau))=1:0:0, permits a combined nu(mu)/nu(tau) appearance and nu(e) disappearance experiment. The observable flux ratio phi(nu(mu))/phi(nu(e)+nu(tau) at Earth depends on the 13 mixing angle theta(13) and the leptonic CP phase delta(CP), thus opening a new way to measure these two quantities.

摘要

在能量范围约为10（18）电子伏特时，观测到来自银道面的高能宇宙射线过量，这可能是由重核光致离解产生的中子原初粒子所导致的。在这种情况下，能量较低的中子在到达地球之前就会衰变，并在1立方千米的中微子望远镜中产生可探测的通量。中微子通量的初始味成分，即φ（νe）：φ（νμ）：φ（ντ）=1：0：0，使得可以进行一个νμ/ντ出现和νe消失的联合实验。在地球上可观测到的通量比φ（νμ）/φ（νe+ντ）取决于13混合角θ13和轻子CP相位δCP，从而为测量这两个量开辟了一条新途径。