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Sensitivity of the T2HKK experiment to nonstandard interactions

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摘要

If the flavor-dependent nonstandard interactions (NSIs) in neutrino propagation exist, then the matter effect is modified, and the modification is parametrized by the dimensionless parameter epsilon(alpha beta) ( alpha, beta = e, mu, tau). In this paper, we discuss the sensitivity of the T2HKK experiment, the possibility of which is now seriously discussed as a future extension of the T2K experiment, to such NSIs. On the assumption that epsilon(alpha mu) = 0 (alpha = e, mu, tau) and epsilon(tau tau) = vertical bar epsilon(e tau)vertical bar/(1 + epsilon(ee)), which are satisfied by other experiments to a good approximation, we find that, among the possible off-axis flux configurations of 1.3 degrees, 1.5 degrees, 2.0 degrees, and 2.5 degrees, the case of the off-axis angle 1.3 degrees gives the highest sensitivity to epsilon(ee) and vertical bar epsilon(e tau vertical bar). Our results show that the 1.3 degrees off- axis configuration can exclude NSIs for vertical bar epsilon(ee)vertical bar greater than or similar to 1 or vertical bar epsilon(e tau) vertical bar greater than or similar to 0.2 at 3 sigma. We also find that in the presence of NSIs T2HKK (for the off-axis angle 1.3 degrees) has better sensitivity to the two CP phases delta(CP) and arg(epsilon(e tau)) than DUNE. This is because of the synergy between the two detectors, i.e., one in Kamioka and one in Korea. T2HKK has better sensitivity to the CP phases than the atmospheric neutrino experiment at HyperKamiokande in inverted hierarchy, but in normal hierarchy, the atmospheric neutrino experiment has the best sensitivity to the CP phases.

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