Capability of the proposed long-baseline experiments to probe large extra dimension

Abstract

Future long-baseline experiments will play an important role in exploring physics beyond the standard model. One such new physics concept is the large extra dimension (LED), which provides an elegant solution to the hierarchy problem. This model also explains the small neutrino mass in a natural way. The presence of LED modifies the standard neutrino oscillation probabilities. Hence, the long-baseline experiments are sensitive to the LED parameters. We explore the potential of the three future long-baseline neutrino experiments, namely T2HK, ESSnuSB, and DUNE, to probe the LED parameter space. We also compare the capability of the charged and neutral current measurements at DUNE to constrain the LED model. We find that T2HK will provide more stringent bounds on the largest compactification radius ($R_{\mathrm{ED}}$) compared to the DUNE and ESSnuSB experiments. At $90\%$ C.L., T2HK can exclude $R_{\mathrm{ED}}\sim 0.45(0.425)$ $\mu$m for the normal (inverted) mass hierarchy scenario.

15 pages, 5 figures, 1 table, Version published in PRD

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• Study of large extra dimension and neutrino decay at P2SO experiment