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We calculate the rate of the rare decay $^{11}\text{Be}$ into $^{10}\text{Be}+ p +e^- + \bar{\nu}_e$ using Halo effective field theory, thereby describingthe process of beta-delayed proton emission. We assume a shallow $1/2^+$resonance in the $^{10}\text{Be}-p$ system with an energy consistent with arecent experiment by Ayyad et al. and obtain $b_p =4.9_{-2.9}^{+5.6}\text{(exp.)}_{-0.8}^{+4.0}\text{(theo.)} \times 10^{-6}$ forthe branching ratio of this decay, predicting a resonance width of $\Gamma_R =(9.0^{+4.8}_{-3.3}\text{(exp.)}^{+5.3}_{-2.2}\text{(theo.)})~\text{keV}$. Ourcalculation shows that the experimental branching ratio and resonanceparameters of Ayyad et al. are consistent with each other. Moreover, we analyzethe general impact of a resonance on the branching ratio and demonstrate that awide range of combinations of resonance energies and widths can reproducebranching ratios of the correct order. Thus, no exotic mechanism (such asbeyond the standard model physics) is needed to explain the experimental decayrate.

$\mathbf{\beta}$-delayed proton emission from $\mathbf{^{11}}$Be in effective field theory